Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ecc_sign_hash.c @ 1831:0a3d02c66bf6

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Comment on reason for DROPBEAR_MAX_PASSWORD_LEN limit
author Matt Johnston <matt@codeconstruct.com.au>
date Tue, 12 Oct 2021 21:29:25 +0800
parents e9dba7abd939
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
382
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diff changeset
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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diff changeset
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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diff changeset
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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diff changeset
8 */
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diff changeset
9
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diff changeset
10 #include "tomcrypt.h"
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11
1476
8305ebe45940 Put Dropbear config in a separate file
Matt Johnston <matt@ucc.asn.au>
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diff changeset
12 #if defined(LTC_MECC) && defined(LTC_DER)
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
13
382
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diff changeset
14 /**
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diff changeset
15 @file ecc_sign_hash.c
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16 ECC Crypto, Tom St Denis
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1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
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17 */
382
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18
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
19 static int _ecc_sign_hash(const unsigned char *in, unsigned long inlen,
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1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
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20 unsigned char *out, unsigned long *outlen,
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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21 prng_state *prng, int wprng, ecc_key *key, int sigformat)
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diff changeset
22 {
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23 ecc_key pubkey;
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e9dba7abd939 Merge libtomcrypt v1.18.2
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24 void *r, *s, *e, *p, *b;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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25 int err, max_iterations = LTC_PK_MAX_RETRIES;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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26 unsigned long pbits, pbytes, i, shift_right;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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27 unsigned char ch, buf[MAXBLOCKSIZE];
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28
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29 LTC_ARGCHK(in != NULL);
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30 LTC_ARGCHK(out != NULL);
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31 LTC_ARGCHK(outlen != NULL);
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32 LTC_ARGCHK(key != NULL);
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33
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34 /* is this a private key? */
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35 if (key->type != PK_PRIVATE) {
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36 return CRYPT_PK_NOT_PRIVATE;
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37 }
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1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
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38
382
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39 /* is the IDX valid ? */
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40 if (ltc_ecc_is_valid_idx(key->idx) != 1) {
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Matt Johnston <matt@ucc.asn.au>
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41 return CRYPT_PK_INVALID_TYPE;
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42 }
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1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
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43
382
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44 if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
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45 return err;
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46 }
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47
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48 /* init the bignums */
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e9dba7abd939 Merge libtomcrypt v1.18.2
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49 if ((err = mp_init_multi(&r, &s, &p, &e, &b, NULL)) != CRYPT_OK) {
382
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50 return err;
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51 }
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52 if ((err = mp_read_radix(p, (char *)key->dp->order, 16)) != CRYPT_OK) { goto errnokey; }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
53
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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54 /* get the hash and load it as a bignum into 'e' */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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55 pbits = mp_count_bits(p);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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56 pbytes = (pbits+7) >> 3;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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57 if (pbits > inlen*8) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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58 if ((err = mp_read_unsigned_bin(e, (unsigned char *)in, inlen)) != CRYPT_OK) { goto errnokey; }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
59 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
60 else if (pbits % 8 == 0) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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61 if ((err = mp_read_unsigned_bin(e, (unsigned char *)in, pbytes)) != CRYPT_OK) { goto errnokey; }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
62 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
63 else {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
64 shift_right = 8 - pbits % 8;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
65 for (i=0, ch=0; i<pbytes; i++) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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66 buf[i] = ch;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
67 ch = (in[i] << (8-shift_right));
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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68 buf[i] = buf[i] ^ (in[i] >> shift_right);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
69 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
70 if ((err = mp_read_unsigned_bin(e, (unsigned char *)buf, pbytes)) != CRYPT_OK) { goto errnokey; }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
71 }
382
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
72
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parents:
diff changeset
73 /* make up a key and export the public copy */
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
74 do {
382
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
75 if ((err = ecc_make_key_ex(prng, wprng, &pubkey, key->dp)) != CRYPT_OK) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
76 goto errnokey;
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parents:
diff changeset
77 }
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parents:
diff changeset
78
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
79 /* find r = x1 mod n */
1710
1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
Matt Johnston <matt@ucc.asn.au>
parents: 1476
diff changeset
80 if ((err = mp_mod(pubkey.pubkey.x, p, r)) != CRYPT_OK) { goto error; }
382
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parents:
diff changeset
81
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
82 if (mp_iszero(r) == LTC_MP_YES) {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
83 ecc_free(&pubkey);
1710
1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
Matt Johnston <matt@ucc.asn.au>
parents: 1476
diff changeset
84 } else {
1711
e9dba7abd939 Merge libtomcrypt v1.18.2
Matt Johnston <matt@ucc.asn.au>
parents: 1710
diff changeset
85 if ((err = rand_bn_upto(b, p, prng, wprng)) != CRYPT_OK) { goto error; } /* b = blinding value */
1710
1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
Matt Johnston <matt@ucc.asn.au>
parents: 1476
diff changeset
86 /* find s = (e + xr)/k */
1711
e9dba7abd939 Merge libtomcrypt v1.18.2
Matt Johnston <matt@ucc.asn.au>
parents: 1710
diff changeset
87 if ((err = mp_mulmod(pubkey.k, b, p, pubkey.k)) != CRYPT_OK) { goto error; } /* k = kb */
e9dba7abd939 Merge libtomcrypt v1.18.2
Matt Johnston <matt@ucc.asn.au>
parents: 1710
diff changeset
88 if ((err = mp_invmod(pubkey.k, p, pubkey.k)) != CRYPT_OK) { goto error; } /* k = 1/kb */
1710
1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
Matt Johnston <matt@ucc.asn.au>
parents: 1476
diff changeset
89 if ((err = mp_mulmod(key->k, r, p, s)) != CRYPT_OK) { goto error; } /* s = xr */
1711
e9dba7abd939 Merge libtomcrypt v1.18.2
Matt Johnston <matt@ucc.asn.au>
parents: 1710
diff changeset
90 if ((err = mp_mulmod(pubkey.k, s, p, s)) != CRYPT_OK) { goto error; } /* s = xr/kb */
e9dba7abd939 Merge libtomcrypt v1.18.2
Matt Johnston <matt@ucc.asn.au>
parents: 1710
diff changeset
91 if ((err = mp_mulmod(pubkey.k, e, p, e)) != CRYPT_OK) { goto error; } /* e = e/kb */
e9dba7abd939 Merge libtomcrypt v1.18.2
Matt Johnston <matt@ucc.asn.au>
parents: 1710
diff changeset
92 if ((err = mp_add(e, s, s)) != CRYPT_OK) { goto error; } /* s = e/kb + xr/kb */
e9dba7abd939 Merge libtomcrypt v1.18.2
Matt Johnston <matt@ucc.asn.au>
parents: 1710
diff changeset
93 if ((err = mp_mulmod(s, b, p, s)) != CRYPT_OK) { goto error; } /* s = b(e/kb + xr/kb) = (e + xr)/k */
1710
1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
Matt Johnston <matt@ucc.asn.au>
parents: 1476
diff changeset
94 ecc_free(&pubkey);
1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
Matt Johnston <matt@ucc.asn.au>
parents: 1476
diff changeset
95 if (mp_iszero(s) == LTC_MP_NO) {
1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
Matt Johnston <matt@ucc.asn.au>
parents: 1476
diff changeset
96 break;
1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
Matt Johnston <matt@ucc.asn.au>
parents: 1476
diff changeset
97 }
382
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
99 } while (--max_iterations > 0);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
100
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
101 if (max_iterations == 0) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
102 goto errnokey;
382
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parents:
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103 }
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104
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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105 if (sigformat == 1) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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106 /* RFC7518 format */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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107 if (*outlen < 2*pbytes) { err = CRYPT_MEM; goto errnokey; }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
108 zeromem(out, 2*pbytes);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
109 i = mp_unsigned_bin_size(r);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
110 if ((err = mp_to_unsigned_bin(r, out + (pbytes - i))) != CRYPT_OK) { goto errnokey; }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
111 i = mp_unsigned_bin_size(s);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
112 if ((err = mp_to_unsigned_bin(s, out + (2*pbytes - i))) != CRYPT_OK) { goto errnokey; }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
113 *outlen = 2*pbytes;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
114 err = CRYPT_OK;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
115 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
116 else {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
117 /* store as ASN.1 SEQUENCE { r, s -- integer } */
1710
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118 err = der_encode_sequence_multi(out, outlen,
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119 LTC_ASN1_INTEGER, 1UL, r,
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120 LTC_ASN1_INTEGER, 1UL, s,
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diff changeset
121 LTC_ASN1_EOL, 0UL, NULL);
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
122 }
382
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parents:
diff changeset
123 goto errnokey;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
124 error:
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diff changeset
125 ecc_free(&pubkey);
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diff changeset
126 errnokey:
1711
e9dba7abd939 Merge libtomcrypt v1.18.2
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diff changeset
127 mp_clear_multi(r, s, p, e, b, NULL);
1710
1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
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diff changeset
128 return err;
382
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diff changeset
129 }
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diff changeset
130
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
131 /**
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
132 Sign a message digest
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
133 @param in The message digest to sign
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
134 @param inlen The length of the digest
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
135 @param out [out] The destination for the signature
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
136 @param outlen [in/out] The max size and resulting size of the signature
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
137 @param prng An active PRNG state
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
138 @param wprng The index of the PRNG you wish to use
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
139 @param key A private ECC key
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
140 @return CRYPT_OK if successful
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
141 */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
142 int ecc_sign_hash(const unsigned char *in, unsigned long inlen,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
143 unsigned char *out, unsigned long *outlen,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
144 prng_state *prng, int wprng, ecc_key *key)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
145 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
146 return _ecc_sign_hash(in, inlen, out, outlen, prng, wprng, key, 0);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
147 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
148
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
149 /**
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
150 Sign a message digest in RFC7518 format
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
151 @param in The message digest to sign
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
152 @param inlen The length of the digest
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
153 @param out [out] The destination for the signature
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
154 @param outlen [in/out] The max size and resulting size of the signature
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
155 @param prng An active PRNG state
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
156 @param wprng The index of the PRNG you wish to use
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
157 @param key A private ECC key
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
158 @return CRYPT_OK if successful
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
159 */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
160 int ecc_sign_hash_rfc7518(const unsigned char *in, unsigned long inlen,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
161 unsigned char *out, unsigned long *outlen,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
162 prng_state *prng, int wprng, ecc_key *key)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
163 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
164 return _ecc_sign_hash(in, inlen, out, outlen, prng, wprng, key, 1);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
165 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
166
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
167 #endif
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
168
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
169 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
170 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
171 /* commit time: $Format:%ai$ */