dropbear: src/pk/ecc/ecc

annotate src/pk/ecc/ecc_sys.c @ 192:9cc34777b479 libtomcrypt

propagate from branch 'au.asn.ucc.matt.ltc-orig' (head 9ba8f01f44320e9cb9f19881105ae84f84a43ea9) to branch 'au.asn.ucc.matt.dropbear.ltc' (head dbf51c569bc34956ad948e4cc87a0eeb2170b768)

author	Matt Johnston <matt@ucc.asn.au>
date	Sun, 08 May 2005 06:36:47 +0000
parents	1c15b283127b
children	39d5d58461d6

rev	line source
191 1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	2 *
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	3 * LibTomCrypt is a library that provides various cryptographic
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	4 * algorithms in a highly modular and flexible manner.
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	5 *
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	6 * The library is free for all purposes without any express
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	7 * guarantee it works.
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	8 *
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	9 * Tom St Denis, [email protected], http://libtomcrypt.org
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	10 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	11
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	12 /**
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	13 @file ecc_sys.c
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	14 ECC Crypto, Tom St Denis
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	15 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	16
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	17 /**
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	18 Encrypt a symmetric key with ECC
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	19 @param in The symmetric key you want to encrypt
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	20 @param inlen The length of the key to encrypt (octets)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	21 @param out [out] The destination for the ciphertext
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	22 @param outlen [in/out] The max size and resulting size of the ciphertext
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	23 @param prng An active PRNG state
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	24 @param wprng The index of the PRNG you wish to use
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	25 @param hash The index of the hash you want to use
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	26 @param key The ECC key you want to encrypt to
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	27 @return CRYPT_OK if successful
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	28 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	29 int ecc_encrypt_key(const unsigned char *in, unsigned long inlen,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	30 unsigned char out, unsigned long outlen,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	31 prng_state *prng, int wprng, int hash,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	32 ecc_key *key)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	33 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	34 unsigned char pub_expt, ecc_shared, *skey;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	35 ecc_key pubkey;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	36 unsigned long x, y, z, hashsize, pubkeysize;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	37 int err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	38
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	39 LTC_ARGCHK(in != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	40 LTC_ARGCHK(out != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	41 LTC_ARGCHK(outlen != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	42 LTC_ARGCHK(key != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	43
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	44 /* check that wprng/cipher/hash are not invalid */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	45 if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	46 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	47 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	48
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	49 if ((err = hash_is_valid(hash)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	50 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	51 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	52
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	53 if (inlen > hash_descriptor[hash].hashsize) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	54 return CRYPT_INVALID_HASH;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	55 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	56
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	57 /* make a random key and export the public copy */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	58 if ((err = ecc_make_key(prng, wprng, ecc_get_size(key), &pubkey)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	59 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	60 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	61
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	62 pub_expt = XMALLOC(ECC_BUF_SIZE);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	63 ecc_shared = XMALLOC(ECC_BUF_SIZE);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	64 skey = XMALLOC(MAXBLOCKSIZE);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	65 if (pub_expt == NULL \|\| ecc_shared == NULL \|\| skey == NULL) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	66 if (pub_expt != NULL) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	67 XFREE(pub_expt);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	68 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	69 if (ecc_shared != NULL) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	70 XFREE(ecc_shared);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	71 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	72 if (skey != NULL) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	73 XFREE(skey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	74 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	75 ecc_free(&pubkey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	76 return CRYPT_MEM;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	77 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	78
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	79 pubkeysize = ECC_BUF_SIZE;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	80 if ((err = ecc_export(pub_expt, &pubkeysize, PK_PUBLIC, &pubkey)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	81 ecc_free(&pubkey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	82 goto LBL_ERR;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	83 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	84
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	85 /* now check if the out buffer is big enough */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	86 if (*outlen < (9 + PACKET_SIZE + pubkeysize + hash_descriptor[hash].hashsize)) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	87 ecc_free(&pubkey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	88 err = CRYPT_BUFFER_OVERFLOW;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	89 goto LBL_ERR;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	90 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	91
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	92 /* make random key */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	93 hashsize = hash_descriptor[hash].hashsize;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	94 x = ECC_BUF_SIZE;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	95 if ((err = ecc_shared_secret(&pubkey, key, ecc_shared, &x)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	96 ecc_free(&pubkey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	97 goto LBL_ERR;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	98 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	99 ecc_free(&pubkey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	100 z = MAXBLOCKSIZE;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	101 if ((err = hash_memory(hash, ecc_shared, x, skey, &z)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	102 goto LBL_ERR;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	103 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	104
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	105 /* store header */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	106 packet_store_header(out, PACKET_SECT_ECC, PACKET_SUB_ENC_KEY);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	107
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	108 /* output header */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	109 y = PACKET_SIZE;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	110
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	111 /* size of hash name and the name itself */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	112 out[y++] = hash_descriptor[hash].ID;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	113
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	114 /* length of ECC pubkey and the key itself */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	115 STORE32L(pubkeysize, out+y);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	116 y += 4;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	117
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	118 for (x = 0; x < pubkeysize; x++, y++) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	119 out[y] = pub_expt[x];
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	120 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	121
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	122 STORE32L(inlen, out+y);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	123 y += 4;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	124
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	125 /* Encrypt/Store the encrypted key */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	126 for (x = 0; x < inlen; x++, y++) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	127 out[y] = skey[x] ^ in[x];
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	128 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	129 *outlen = y;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	130
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	131 err = CRYPT_OK;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	132 LBL_ERR:
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	133 #ifdef LTC_CLEAN_STACK
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	134 /* clean up */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	135 zeromem(pub_expt, ECC_BUF_SIZE);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	136 zeromem(ecc_shared, ECC_BUF_SIZE);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	137 zeromem(skey, MAXBLOCKSIZE);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	138 #endif
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	139
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	140 XFREE(skey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	141 XFREE(ecc_shared);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	142 XFREE(pub_expt);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	143
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	144 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	145 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	146
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	147 /**
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	148 Decrypt an ECC encrypted key
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	149 @param in The ciphertext
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	150 @param inlen The length of the ciphertext (octets)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	151 @param out [out] The plaintext
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	152 @param outlen [in/out] The max size and resulting size of the plaintext
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	153 @param key The corresponding private ECC key
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	154 @return CRYPT_OK if successful
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	155 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	156 int ecc_decrypt_key(const unsigned char *in, unsigned long inlen,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	157 unsigned char out, unsigned long outlen,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	158 ecc_key *key)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	159 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	160 unsigned char shared_secret, skey;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	161 unsigned long x, y, z, hashsize, keysize;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	162 int hash, err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	163 ecc_key pubkey;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	164
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	165 LTC_ARGCHK(in != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	166 LTC_ARGCHK(out != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	167 LTC_ARGCHK(outlen != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	168 LTC_ARGCHK(key != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	169
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	170 /* right key type? */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	171 if (key->type != PK_PRIVATE) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	172 return CRYPT_PK_NOT_PRIVATE;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	173 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	174
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	175 /* correct length ? */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	176 if (inlen < PACKET_SIZE+1+4+4) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	177 return CRYPT_INVALID_PACKET;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	178 } else {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	179 inlen -= PACKET_SIZE+1+4+4;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	180 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	181
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	182 /* is header correct? */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	183 if ((err = packet_valid_header((unsigned char *)in, PACKET_SECT_ECC, PACKET_SUB_ENC_KEY)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	184 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	185 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	186
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	187 /* now lets get the hash name */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	188 y = PACKET_SIZE;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	189 hash = find_hash_id(in[y++]);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	190 if (hash == -1) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	191 return CRYPT_INVALID_HASH;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	192 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	193
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	194 /* common values */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	195 hashsize = hash_descriptor[hash].hashsize;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	196
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	197 /* get public key */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	198 LOAD32L(x, in+y);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	199 if (inlen < x) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	200 return CRYPT_INVALID_PACKET;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	201 } else {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	202 inlen -= x;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	203 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	204 y += 4;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	205 if ((err = ecc_import(in+y, x, &pubkey)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	206 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	207 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	208 y += x;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	209
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	210 /* allocate memory */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	211 shared_secret = XMALLOC(ECC_BUF_SIZE);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	212 skey = XMALLOC(MAXBLOCKSIZE);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	213 if (shared_secret == NULL \|\| skey == NULL) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	214 if (shared_secret != NULL) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	215 XFREE(shared_secret);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	216 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	217 if (skey != NULL) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	218 XFREE(skey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	219 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	220 ecc_free(&pubkey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	221 return CRYPT_MEM;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	222 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	223
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	224 /* make shared key */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	225 x = ECC_BUF_SIZE;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	226 if ((err = ecc_shared_secret(key, &pubkey, shared_secret, &x)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	227 ecc_free(&pubkey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	228 goto LBL_ERR;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	229 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	230 ecc_free(&pubkey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	231
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	232 z = MAXBLOCKSIZE;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	233 if ((err = hash_memory(hash, shared_secret, x, skey, &z)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	234 goto LBL_ERR;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	235 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	236
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	237 LOAD32L(keysize, in+y);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	238 if (inlen < keysize) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	239 err = CRYPT_INVALID_PACKET;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	240 goto LBL_ERR;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	241 } else {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	242 inlen -= keysize;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	243 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	244 y += 4;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	245
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	246 if (*outlen < keysize) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	247 err = CRYPT_BUFFER_OVERFLOW;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	248 goto LBL_ERR;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	249 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	250
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	251 /* Decrypt the key */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	252 for (x = 0; x < keysize; x++, y++) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	253 out[x] = skey[x] ^ in[y];
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	254 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	255
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	256 *outlen = keysize;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	257
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	258 err = CRYPT_OK;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	259 LBL_ERR:
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	260 #ifdef LTC_CLEAN_STACK
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	261 zeromem(shared_secret, ECC_BUF_SIZE);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	262 zeromem(skey, MAXBLOCKSIZE);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	263 #endif
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	264
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	265 XFREE(skey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	266 XFREE(shared_secret);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	267
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	268 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	269 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	270
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	271 /**
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	272 Sign a message digest
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	273 @param in The message digest to sign
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	274 @param inlen The length of the digest
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	275 @param out [out] The destination for the signature
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	276 @param outlen [in/out] The max size and resulting size of the signature
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	277 @param prng An active PRNG state
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	278 @param wprng The index of the PRNG you wish to use
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	279 @param key A private ECC key
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	280 @return CRYPT_OK if successful
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	281 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	282 int ecc_sign_hash(const unsigned char *in, unsigned long inlen,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	283 unsigned char out, unsigned long outlen,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	284 prng_state prng, int wprng, ecc_key key)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	285 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	286 ecc_key pubkey;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	287 mp_int b, p;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	288 unsigned char epubkey, er;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	289 unsigned long x, y, pubkeysize, rsize;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	290 int err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	291
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	292 LTC_ARGCHK(in != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	293 LTC_ARGCHK(out != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	294 LTC_ARGCHK(outlen != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	295 LTC_ARGCHK(key != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	296
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	297 /* is this a private key? */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	298 if (key->type != PK_PRIVATE) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	299 return CRYPT_PK_NOT_PRIVATE;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	300 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	301
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	302 /* is the IDX valid ? */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	303 if (is_valid_idx(key->idx) != 1) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	304 return CRYPT_PK_INVALID_TYPE;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	305 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	306
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	307 if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	308 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	309 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	310
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	311 /* make up a key and export the public copy */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	312 if ((err = ecc_make_key(prng, wprng, ecc_get_size(key), &pubkey)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	313 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	314 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	315
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	316 /* allocate ram */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	317 epubkey = XMALLOC(ECC_BUF_SIZE);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	318 er = XMALLOC(ECC_BUF_SIZE);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	319 if (epubkey == NULL \|\| er == NULL) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	320 if (epubkey != NULL) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	321 XFREE(epubkey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	322 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	323 if (er != NULL) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	324 XFREE(er);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	325 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	326 ecc_free(&pubkey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	327 return CRYPT_MEM;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	328 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	329
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	330 pubkeysize = ECC_BUF_SIZE;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	331 if ((err = ecc_export(epubkey, &pubkeysize, PK_PUBLIC, &pubkey)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	332 ecc_free(&pubkey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	333 goto LBL_ERR;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	334 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	335
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	336 /* get the hash and load it as a bignum into 'b' */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	337 /* init the bignums */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	338 if ((err = mp_init_multi(&b, &p, NULL)) != MP_OKAY) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	339 ecc_free(&pubkey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	340 err = mpi_to_ltc_error(err);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	341 goto LBL_ERR;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	342 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	343 if ((err = mp_read_radix(&p, (char *)sets[key->idx].order, 64)) != MP_OKAY) { goto error; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	344 if ((err = mp_read_unsigned_bin(&b, (unsigned char *)in, (int)inlen)) != MP_OKAY) { goto error; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	345
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	346 /* find b = (m - x)/k */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	347 if ((err = mp_invmod(&pubkey.k, &p, &pubkey.k)) != MP_OKAY) { goto error; } /* k = 1/k */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	348 if ((err = mp_submod(&b, &key->k, &p, &b)) != MP_OKAY) { goto error; } /* b = m - x */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	349 if ((err = mp_mulmod(&b, &pubkey.k, &p, &b)) != MP_OKAY) { goto error; } /* b = (m - x)/k */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	350
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	351 /* export it */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	352 rsize = (unsigned long)mp_unsigned_bin_size(&b);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	353 if (rsize > ECC_BUF_SIZE) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	354 err = CRYPT_BUFFER_OVERFLOW;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	355 goto error;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	356 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	357 if ((err = mp_to_unsigned_bin(&b, er)) != MP_OKAY) { goto error; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	358
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	359 /* now lets check the outlen before we write */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	360 if (*outlen < (12 + rsize + pubkeysize)) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	361 err = CRYPT_BUFFER_OVERFLOW;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	362 goto LBL_ERR;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	363 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	364
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	365 /* lets output */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	366 y = PACKET_SIZE;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	367
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	368 /* size of public key */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	369 STORE32L(pubkeysize, out+y);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	370 y += 4;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	371
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	372 /* copy the public key */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	373 for (x = 0; x < pubkeysize; x++, y++) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	374 out[y] = epubkey[x];
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	375 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	376
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	377 /* size of 'r' */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	378 STORE32L(rsize, out+y);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	379 y += 4;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	380
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	381 /* copy r */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	382 for (x = 0; x < rsize; x++, y++) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	383 out[y] = er[x];
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	384 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	385
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	386 /* store header */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	387 packet_store_header(out, PACKET_SECT_ECC, PACKET_SUB_SIGNED);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	388 *outlen = y;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	389
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	390 /* all ok */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	391 err = CRYPT_OK;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	392 goto LBL_ERR;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	393 error:
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	394 err = mpi_to_ltc_error(err);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	395 LBL_ERR:
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	396 mp_clear_multi(&b, &p, NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	397 ecc_free(&pubkey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	398 #ifdef LTC_CLEAN_STACK
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	399 zeromem(er, ECC_BUF_SIZE);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	400 zeromem(epubkey, ECC_BUF_SIZE);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	401 #endif
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	402
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	403 XFREE(epubkey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	404 XFREE(er);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	405
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	406 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	407 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	408
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	409 /* verify that mG = (bA + Y)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	410 *
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	411 * The signatures work by making up a fresh key "a" with a public key "A". Now we want to sign so the
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	412 * public key Y = xG can verify it.
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	413 *
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	414 * b = (m - x)/k, A is the public key embedded and Y is the users public key [who signed it]
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	415 * A = kG therefore bA == ((m-x)/k)kG == (m-x)G
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	416 *
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	417 * Adding Y = xG to the bA gives us (m-x)G + xG == mG
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	418 *
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	419 * The user given only xG, kG and b cannot determine k or x which means they can't find the private key.
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	420 *
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	421 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	422
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	423 /**
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	424 Verify an ECC signature
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	425 @param sig The signature to verify
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	426 @param siglen The length of the signature (octets)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	427 @param hash The hash (message digest) that was signed
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	428 @param hashlen The length of the hash (octets)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	429 @param stat Result of signature, 1==valid, 0==invalid
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	430 @param key The corresponding public ECC key
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	431 @return CRYPT_OK if successful (even if the signature is not valid)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	432 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	433 int ecc_verify_hash(const unsigned char *sig, unsigned long siglen,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	434 const unsigned char *hash, unsigned long hashlen,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	435 int stat, ecc_key key)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	436 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	437 ecc_point *mG;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	438 ecc_key pubkey;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	439 mp_int b, p, m, mu;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	440 unsigned long x, y;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	441 int err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	442
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	443 LTC_ARGCHK(sig != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	444 LTC_ARGCHK(hash != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	445 LTC_ARGCHK(stat != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	446 LTC_ARGCHK(key != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	447
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	448 /* default to invalid signature */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	449 *stat = 0;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	450
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	451 if (siglen < PACKET_SIZE+4+4) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	452 return CRYPT_INVALID_PACKET;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	453 } else {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	454 siglen -= PACKET_SIZE+4+4;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	455 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	456
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	457 /* is the message format correct? */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	458 if ((err = packet_valid_header((unsigned char *)sig, PACKET_SECT_ECC, PACKET_SUB_SIGNED)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	459 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	460 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	461
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	462 /* get hash name */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	463 y = PACKET_SIZE;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	464
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	465 /* get size of public key */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	466 LOAD32L(x, sig+y);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	467 if (siglen < x) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	468 return CRYPT_INVALID_PACKET;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	469 } else {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	470 siglen -= x;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	471 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	472 y += 4;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	473
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	474 /* load the public key */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	475 if ((err = ecc_import((unsigned char*)sig+y, x, &pubkey)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	476 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	477 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	478 y += x;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	479
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	480 /* load size of 'b' */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	481 LOAD32L(x, sig+y);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	482 if (siglen < x) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	483 return CRYPT_INVALID_PACKET;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	484 } else {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	485 siglen -= x;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	486 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	487 y += 4;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	488
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	489 /* init values */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	490 if ((err = mp_init_multi(&b, &m, &p, &mu, NULL)) != MP_OKAY) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	491 ecc_free(&pubkey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	492 return mpi_to_ltc_error(err);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	493 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	494
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	495 mG = new_point();
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	496 if (mG == NULL) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	497 mp_clear_multi(&b, &m, &p, &mu, NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	498 ecc_free(&pubkey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	499 return CRYPT_MEM;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	500 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	501
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	502 /* load b */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	503 if ((err = mp_read_unsigned_bin(&b, (unsigned char *)sig+y, (int)x)) != MP_OKAY) { goto error; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	504 y += x;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	505
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	506 /* get m in binary a bignum */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	507 if ((err = mp_read_unsigned_bin(&m, (unsigned char *)hash, (int)hashlen)) != MP_OKAY) { goto error; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	508
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	509 /* load prime */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	510 if ((err = mp_read_radix(&p, (char *)sets[key->idx].prime, 64)) != MP_OKAY) { goto error; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	511
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	512 /* calculate barrett stuff */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	513 mp_set(&mu, 1);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	514 mp_lshd(&mu, 2 * USED(&p));
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	515 if ((err = mp_div(&mu, &p, &mu, NULL)) != MP_OKAY) { goto error; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	516
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	517 /* get bA */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	518 if ((err = ecc_mulmod(&b, &pubkey.pubkey, &pubkey.pubkey, &p)) != CRYPT_OK) { goto done; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	519
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	520 /* get bA + Y */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	521 if ((err = add_point(&pubkey.pubkey, &key->pubkey, &pubkey.pubkey, &p, &mu)) != CRYPT_OK) { goto done; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	522
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	523 /* we have to transform it */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	524 if ((err = ecc_map(&pubkey.pubkey, &p, &mu)) != CRYPT_OK) { goto done; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	525
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	526 /* get mG */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	527 if ((err = mp_read_radix(&mG->x, (char *)sets[key->idx].Gx, 64)) != MP_OKAY) { goto error; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	528 if ((err = mp_read_radix(&mG->y, (char *)sets[key->idx].Gy, 64)) != MP_OKAY) { goto error; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	529 mp_set(&mG->z, 1);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	530 if ((err = ecc_mulmod(&m, mG, mG, &p)) != CRYPT_OK) { goto done; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	531
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	532 /* compare mG to bA + Y */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	533 if (mp_cmp(&mG->x, &pubkey.pubkey.x) == MP_EQ && mp_cmp(&mG->y, &pubkey.pubkey.y) == MP_EQ) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	534 *stat = 1;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	535 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	536
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	537 /* clear up and return */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	538 err = CRYPT_OK;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	539 goto done;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	540 error:
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	541 err = mpi_to_ltc_error(err);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	542 done:
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	543 del_point(mG);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	544 ecc_free(&pubkey);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	545 mp_clear_multi(&p, &m, &b, &mu, NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	546 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	547 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	548

Mercurial > dropbear

annotate src/pk/ecc/ecc_sys.c @ 192:9cc34777b479 libtomcrypt