Mercurial > dropbear
annotate libtomcrypt/src/pk/ecc/ecc_sys.c @ 285:1b9e69c058d2
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to branch 'au.asn.ucc.matt.dropbear' (head fdf4a7a3b97ae5046139915de7e40399cceb2c01)
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 08 Mar 2006 13:23:58 +0000 |
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285
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 * |
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9 * Tom St Denis, [email protected], http://libtomcrypt.org |
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10 */ |
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11 |
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12 /** |
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13 @file ecc_sys.c |
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14 ECC Crypto, Tom St Denis |
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15 */ |
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16 |
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17 /** |
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18 Encrypt a symmetric key with ECC |
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19 @param in The symmetric key you want to encrypt |
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20 @param inlen The length of the key to encrypt (octets) |
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21 @param out [out] The destination for the ciphertext |
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22 @param outlen [in/out] The max size and resulting size of the ciphertext |
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23 @param prng An active PRNG state |
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24 @param wprng The index of the PRNG you wish to use |
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25 @param hash The index of the hash you want to use |
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26 @param key The ECC key you want to encrypt to |
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27 @return CRYPT_OK if successful |
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28 */ |
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29 int ecc_encrypt_key(const unsigned char *in, unsigned long inlen, |
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30 unsigned char *out, unsigned long *outlen, |
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31 prng_state *prng, int wprng, int hash, |
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32 ecc_key *key) |
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33 { |
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34 unsigned char *pub_expt, *ecc_shared, *skey; |
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35 ecc_key pubkey; |
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36 unsigned long x, y, pubkeysize; |
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37 int err; |
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38 |
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39 LTC_ARGCHK(in != NULL); |
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40 LTC_ARGCHK(out != NULL); |
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41 LTC_ARGCHK(outlen != NULL); |
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42 LTC_ARGCHK(key != NULL); |
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43 |
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44 /* check that wprng/cipher/hash are not invalid */ |
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45 if ((err = prng_is_valid(wprng)) != CRYPT_OK) { |
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46 return err; |
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47 } |
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48 |
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49 if ((err = hash_is_valid(hash)) != CRYPT_OK) { |
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50 return err; |
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51 } |
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52 |
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53 if (inlen > hash_descriptor[hash].hashsize) { |
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54 return CRYPT_INVALID_HASH; |
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55 } |
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56 |
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57 /* make a random key and export the public copy */ |
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58 if ((err = ecc_make_key(prng, wprng, ecc_get_size(key), &pubkey)) != CRYPT_OK) { |
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59 return err; |
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60 } |
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61 |
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62 pub_expt = XMALLOC(ECC_BUF_SIZE); |
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63 ecc_shared = XMALLOC(ECC_BUF_SIZE); |
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64 skey = XMALLOC(MAXBLOCKSIZE); |
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65 if (pub_expt == NULL || ecc_shared == NULL || skey == NULL) { |
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66 if (pub_expt != NULL) { |
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67 XFREE(pub_expt); |
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68 } |
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69 if (ecc_shared != NULL) { |
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70 XFREE(ecc_shared); |
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71 } |
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72 if (skey != NULL) { |
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73 XFREE(skey); |
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74 } |
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75 ecc_free(&pubkey); |
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76 return CRYPT_MEM; |
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77 } |
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78 |
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79 pubkeysize = ECC_BUF_SIZE; |
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80 if ((err = ecc_export(pub_expt, &pubkeysize, PK_PUBLIC, &pubkey)) != CRYPT_OK) { |
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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
81 ecc_free(&pubkey); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
82 goto LBL_ERR; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
83 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
84 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
85 /* make random key */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
86 x = ECC_BUF_SIZE; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
87 if ((err = ecc_shared_secret(&pubkey, key, ecc_shared, &x)) != CRYPT_OK) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
88 ecc_free(&pubkey); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
89 goto LBL_ERR; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
90 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
91 ecc_free(&pubkey); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
92 y = MAXBLOCKSIZE; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
93 if ((err = hash_memory(hash, ecc_shared, x, skey, &y)) != CRYPT_OK) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
94 goto LBL_ERR; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
95 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
96 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
97 /* Encrypt key */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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98 for (x = 0; x < inlen; x++) { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
99 skey[x] ^= in[x]; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
100 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
101 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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102 err = der_encode_sequence_multi(out, outlen, |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
103 LTC_ASN1_OBJECT_IDENTIFIER, hash_descriptor[hash].OIDlen, hash_descriptor[hash].OID, |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
104 LTC_ASN1_OCTET_STRING, pubkeysize, pub_expt, |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
105 LTC_ASN1_OCTET_STRING, inlen, skey, |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
106 LTC_ASN1_EOL, 0UL, NULL); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
107 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
108 LBL_ERR: |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
109 #ifdef LTC_CLEAN_STACK |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
110 /* clean up */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
111 zeromem(pub_expt, ECC_BUF_SIZE); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
112 zeromem(ecc_shared, ECC_BUF_SIZE); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
113 zeromem(skey, MAXBLOCKSIZE); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
114 #endif |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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115 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
116 XFREE(skey); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
117 XFREE(ecc_shared); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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|
118 XFREE(pub_expt); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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119 |
1b9e69c058d2
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120 return err; |
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Matt Johnston <matt@ucc.asn.au>
parents:
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121 } |
1b9e69c058d2
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122 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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123 /** |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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124 Decrypt an ECC encrypted key |
1b9e69c058d2
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parents:
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125 @param in The ciphertext |
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126 @param inlen The length of the ciphertext (octets) |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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127 @param out [out] The plaintext |
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Matt Johnston <matt@ucc.asn.au>
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|
128 @param outlen [in/out] The max size and resulting size of the plaintext |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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|
129 @param key The corresponding private ECC key |
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
130 @return CRYPT_OK if successful |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
131 */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
132 int ecc_decrypt_key(const unsigned char *in, unsigned long inlen, |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
133 unsigned char *out, unsigned long *outlen, |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
134 ecc_key *key) |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
135 { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
136 unsigned char *ecc_shared, *skey, *pub_expt; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
137 unsigned long x, y, hashOID[32]; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
138 int hash, err; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
139 ecc_key pubkey; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
140 ltc_asn1_list decode[3]; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
141 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
142 LTC_ARGCHK(in != NULL); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
143 LTC_ARGCHK(out != NULL); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
144 LTC_ARGCHK(outlen != NULL); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
145 LTC_ARGCHK(key != NULL); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
146 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
147 /* right key type? */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
148 if (key->type != PK_PRIVATE) { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
149 return CRYPT_PK_NOT_PRIVATE; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
150 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
151 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
152 /* decode to find out hash */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
153 LTC_SET_ASN1(decode, 0, LTC_ASN1_OBJECT_IDENTIFIER, hashOID, sizeof(hashOID)/sizeof(hashOID[0])); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
154 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
155 if ((err = der_decode_sequence(in, inlen, decode, 1)) != CRYPT_OK) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
156 return err; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
157 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
158 for (hash = 0; hash_descriptor[hash].name != NULL && |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
159 (hash_descriptor[hash].OIDlen != decode[0].size || |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
160 memcmp(hash_descriptor[hash].OID, hashOID, sizeof(unsigned long)*decode[0].size)); hash++); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
161 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
162 if (hash_descriptor[hash].name == NULL) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
163 return CRYPT_INVALID_PACKET; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
164 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
165 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
166 /* we now have the hash! */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
167 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
168 /* allocate memory */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
169 pub_expt = XMALLOC(ECC_BUF_SIZE); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
170 ecc_shared = XMALLOC(ECC_BUF_SIZE); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
171 skey = XMALLOC(MAXBLOCKSIZE); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
172 if (pub_expt == NULL || ecc_shared == NULL || skey == NULL) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
173 if (pub_expt != NULL) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
174 XFREE(pub_expt); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
175 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
176 if (ecc_shared != NULL) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
177 XFREE(ecc_shared); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
178 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
179 if (skey != NULL) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
180 XFREE(skey); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
181 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
182 return CRYPT_MEM; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
183 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
184 LTC_SET_ASN1(decode, 1, LTC_ASN1_OCTET_STRING, pub_expt, ECC_BUF_SIZE); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
185 LTC_SET_ASN1(decode, 2, LTC_ASN1_OCTET_STRING, skey, MAXBLOCKSIZE); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
186 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
187 /* read the structure in now */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
188 if ((err = der_decode_sequence(in, inlen, decode, 3)) != CRYPT_OK) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
189 goto LBL_ERR; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
190 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
191 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
192 /* import ECC key from packet */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
193 if ((err = ecc_import(decode[1].data, decode[1].size, &pubkey)) != CRYPT_OK) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
194 goto LBL_ERR; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
195 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
196 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
197 /* make shared key */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
198 x = ECC_BUF_SIZE; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
199 if ((err = ecc_shared_secret(key, &pubkey, ecc_shared, &x)) != CRYPT_OK) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
200 ecc_free(&pubkey); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
201 goto LBL_ERR; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
202 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
203 ecc_free(&pubkey); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
204 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
205 y = MAXBLOCKSIZE; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
206 if ((err = hash_memory(hash, ecc_shared, x, ecc_shared, &y)) != CRYPT_OK) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
207 goto LBL_ERR; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
208 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
209 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
210 /* ensure the hash of the shared secret is at least as big as the encrypt itself */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
211 if (decode[2].size > y) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
212 err = CRYPT_INVALID_PACKET; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
213 goto LBL_ERR; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
214 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
215 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
216 /* avoid buffer overflow */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
217 if (*outlen < decode[2].size) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
218 err = CRYPT_BUFFER_OVERFLOW; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
219 goto LBL_ERR; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
220 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
221 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
222 /* Decrypt the key */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
223 for (x = 0; x < decode[2].size; x++) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
224 out[x] = skey[x] ^ ecc_shared[x]; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
225 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
226 *outlen = x; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
227 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
228 err = CRYPT_OK; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
229 LBL_ERR: |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
230 #ifdef LTC_CLEAN_STACK |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
231 zeromem(pub_expt, ECC_BUF_SIZE); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
232 zeromem(ecc_shared, ECC_BUF_SIZE); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
233 zeromem(skey, MAXBLOCKSIZE); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
234 #endif |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
235 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
236 XFREE(pub_expt); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
237 XFREE(ecc_shared); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
238 XFREE(skey); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
239 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
240 return err; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
241 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
242 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
243 /** |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
244 Sign a message digest |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
245 @param in The message digest to sign |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
246 @param inlen The length of the digest |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
247 @param out [out] The destination for the signature |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
248 @param outlen [in/out] The max size and resulting size of the signature |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
249 @param prng An active PRNG state |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
250 @param wprng The index of the PRNG you wish to use |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
251 @param key A private ECC key |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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diff
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|
252 @return CRYPT_OK if successful |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
253 */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
254 int ecc_sign_hash(const unsigned char *in, unsigned long inlen, |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
255 unsigned char *out, unsigned long *outlen, |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
256 prng_state *prng, int wprng, ecc_key *key) |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
257 { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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258 ecc_key pubkey; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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259 mp_int r, s, e, p; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
260 int err; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
261 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
262 LTC_ARGCHK(in != NULL); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
263 LTC_ARGCHK(out != NULL); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
264 LTC_ARGCHK(outlen != NULL); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
265 LTC_ARGCHK(key != NULL); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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|
266 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
267 /* is this a private key? */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
268 if (key->type != PK_PRIVATE) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
269 return CRYPT_PK_NOT_PRIVATE; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
270 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff
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|
271 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
272 /* is the IDX valid ? */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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273 if (is_valid_idx(key->idx) != 1) { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
274 return CRYPT_PK_INVALID_TYPE; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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275 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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|
276 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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277 if ((err = prng_is_valid(wprng)) != CRYPT_OK) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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278 return err; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
279 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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280 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
281 /* get the hash and load it as a bignum into 'e' */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
282 /* init the bignums */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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283 if ((err = mp_init_multi(&r, &s, &p, &e, NULL)) != MP_OKAY) { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
284 ecc_free(&pubkey); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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285 err = mpi_to_ltc_error(err); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
286 goto LBL_ERR; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
287 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
288 if ((err = mp_read_radix(&p, (char *)sets[key->idx].order, 64)) != MP_OKAY) { goto error; } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
289 if ((err = mp_read_unsigned_bin(&e, (unsigned char *)in, (int)inlen)) != MP_OKAY) { goto error; } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
290 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
291 /* make up a key and export the public copy */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
292 for (;;) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
293 if ((err = ecc_make_key(prng, wprng, ecc_get_size(key), &pubkey)) != CRYPT_OK) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
294 return err; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
295 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
296 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
297 /* find r = x1 mod n */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
298 if ((err = mp_mod(&pubkey.pubkey.x, &p, &r)) != MP_OKAY) { goto error; } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
299 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
300 if (mp_iszero(&r)) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
301 ecc_free(&pubkey); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
302 } else { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
303 /* find s = (e + xr)/k */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
304 if ((err = mp_invmod(&pubkey.k, &p, &pubkey.k)) != MP_OKAY) { goto error; } /* k = 1/k */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
305 if ((err = mp_mulmod(&key->k, &r, &p, &s)) != MP_OKAY) { goto error; } /* s = xr */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
306 if ((err = mp_addmod(&e, &s, &p, &s)) != MP_OKAY) { goto error; } /* s = e + xr */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
307 if ((err = mp_mulmod(&s, &pubkey.k, &p, &s)) != MP_OKAY) { goto error; } /* s = (e + xr)/k */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
308 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
309 if (mp_iszero(&s)) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
310 ecc_free(&pubkey); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
311 } else { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
312 break; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
313 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
314 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
315 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
316 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
317 /* store as SEQUENCE { r, s -- integer } */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
318 err = der_encode_sequence_multi(out, outlen, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
319 LTC_ASN1_INTEGER, 1UL, &r, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
320 LTC_ASN1_INTEGER, 1UL, &s, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
321 LTC_ASN1_EOL, 0UL, NULL); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
322 goto LBL_ERR; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
323 error: |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
324 err = mpi_to_ltc_error(err); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
325 LBL_ERR: |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
326 mp_clear_multi(&r, &s, &p, &e, NULL); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
327 ecc_free(&pubkey); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
328 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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329 return err; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
330 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
331 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
332 /* verify |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
333 * |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
334 * w = s^-1 mod n |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
335 * u1 = xw |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
336 * u2 = rw |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
337 * X = u1*G + u2*Q |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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338 * v = X_x1 mod n |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
339 * accept if v == r |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
340 */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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341 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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342 /** |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
343 Verify an ECC signature |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
344 @param sig The signature to verify |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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345 @param siglen The length of the signature (octets) |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
346 @param hash The hash (message digest) that was signed |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
347 @param hashlen The length of the hash (octets) |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
348 @param stat Result of signature, 1==valid, 0==invalid |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
349 @param key The corresponding public ECC key |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
350 @return CRYPT_OK if successful (even if the signature is not valid) |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
351 */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
352 int ecc_verify_hash(const unsigned char *sig, unsigned long siglen, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
353 const unsigned char *hash, unsigned long hashlen, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
354 int *stat, ecc_key *key) |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
355 { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
356 ecc_point *mG, *mQ; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
357 mp_int r, s, v, w, u1, u2, e, p, m; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
358 mp_digit mp; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
359 int err; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
360 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
361 LTC_ARGCHK(sig != NULL); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
362 LTC_ARGCHK(hash != NULL); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
363 LTC_ARGCHK(stat != NULL); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
364 LTC_ARGCHK(key != NULL); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
365 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
366 /* default to invalid signature */ |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
367 *stat = 0; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
368 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
369 /* is the IDX valid ? */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
370 if (is_valid_idx(key->idx) != 1) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
371 return CRYPT_PK_INVALID_TYPE; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
372 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
373 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
374 /* allocate ints */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
375 if ((err = mp_init_multi(&r, &s, &v, &w, &u1, &u2, &p, &e, &m, NULL)) != MP_OKAY) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
376 return CRYPT_MEM; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
377 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
378 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
379 /* allocate points */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
380 mG = new_point(); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
381 mQ = new_point(); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
382 if (mQ == NULL || mG == NULL) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
383 err = CRYPT_MEM; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
384 goto done; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
385 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
386 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
387 /* parse header */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
388 if ((err = der_decode_sequence_multi(sig, siglen, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
389 LTC_ASN1_INTEGER, 1UL, &r, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
390 LTC_ASN1_INTEGER, 1UL, &s, |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
391 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
392 goto done; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
393 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
394 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
395 /* get the order */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
396 if ((err = mp_read_radix(&p, (char *)sets[key->idx].order, 64)) != MP_OKAY) { goto error; } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
397 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
398 /* get the modulus */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
399 if ((err = mp_read_radix(&m, (char *)sets[key->idx].prime, 64)) != MP_OKAY) { goto error; } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
400 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
401 /* check for zero */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
402 if (mp_iszero(&r) || mp_iszero(&s) || mp_cmp(&r, &p) != MP_LT || mp_cmp(&s, &p) != MP_LT) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
403 err = CRYPT_INVALID_PACKET; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
404 goto done; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
405 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
406 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
407 /* read hash */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
408 if ((err = mp_read_unsigned_bin(&e, (unsigned char *)hash, (int)hashlen)) != MP_OKAY) { goto error; } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
409 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
410 /* w = s^-1 mod n */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
411 if ((err = mp_invmod(&s, &p, &w)) != MP_OKAY) { goto error; } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
412 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
413 /* u1 = ew */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
414 if ((err = mp_mulmod(&e, &w, &p, &u1)) != MP_OKAY) { goto error; } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
415 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
416 /* u2 = rw */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
417 if ((err = mp_mulmod(&r, &w, &p, &u2)) != MP_OKAY) { goto error; } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
418 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
419 /* find mG = u1*G */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
420 if ((err = mp_read_radix(&mG->x, (char *)sets[key->idx].Gx, 64)) != MP_OKAY) { goto error; } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
421 if ((err = mp_read_radix(&mG->y, (char *)sets[key->idx].Gy, 64)) != MP_OKAY) { goto error; } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
422 mp_set(&mG->z, 1); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
423 if ((err = ecc_mulmod(&u1, mG, mG, &m, 0)) != CRYPT_OK) { goto done; } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
424 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
425 /* find mQ = u2*Q */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
426 if ((err = mp_copy(&key->pubkey.x, &mQ->x)) != MP_OKAY) { goto error; } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
427 if ((err = mp_copy(&key->pubkey.y, &mQ->y)) != MP_OKAY) { goto error; } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
428 if ((err = mp_copy(&key->pubkey.z, &mQ->z)) != MP_OKAY) { goto error; } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
429 if ((err = ecc_mulmod(&u2, mQ, mQ, &m, 0)) != CRYPT_OK) { goto done; } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
430 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
431 /* find the montgomery mp */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
432 if ((err = mp_montgomery_setup(&m, &mp)) != MP_OKAY) { goto error; } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
433 /* add them */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
434 if ((err = add_point(mQ, mG, mG, &m, mp)) != CRYPT_OK) { goto done; } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
435 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
436 /* reduce */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
437 if ((err = ecc_map(mG, &m, mp)) != CRYPT_OK) { goto done; } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
438 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
439 /* v = X_x1 mod n */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
440 if ((err = mp_mod(&mG->x, &p, &v)) != CRYPT_OK) { goto done; } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
441 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
442 /* does v == r */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
443 if (mp_cmp(&v, &r) == MP_EQ) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
444 *stat = 1; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
445 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
446 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
447 /* clear up and return */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
448 err = CRYPT_OK; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
449 goto done; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
450 error: |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
451 err = mpi_to_ltc_error(err); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
452 done: |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
453 del_point(mG); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
454 del_point(mQ); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
455 mp_clear_multi(&r, &s, &v, &w, &u1, &u2, &p, &e, &m, NULL); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
456 return err; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
457 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
458 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
459 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
460 /* $Source: /cvs/libtom/libtomcrypt/src/pk/ecc/ecc_sys.c,v $ */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
461 /* $Revision: 1.18 $ */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
462 /* $Date: 2005/06/14 20:47:55 $ */ |