Mercurial > dropbear

annotate libtomcrypt/src/pk/dsa/dsa_verify_hash.c @ 1734:73646de50f13 DROPBEAR_2020.80

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version 2020.80
author Matt Johnston <matt@ucc.asn.au>
date Fri, 26 Jun 2020 21:45:59 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
285
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diff changeset
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 #include "tomcrypt.h"
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10
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11 /**
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12 @file dsa_verify_hash.c
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13 DSA implementation, verify a signature, Tom St Denis
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14 */
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15
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16
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17 #ifdef LTC_MDSA
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18
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19 /**
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20 Verify a DSA signature
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21 @param r DSA "r" parameter
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22 @param s DSA "s" parameter
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23 @param hash The hash that was signed
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24 @param hashlen The length of the hash that was signed
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25 @param stat [out] The result of the signature verification, 1==valid, 0==invalid
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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26 @param key The corresponding public DSA key
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27 @return CRYPT_OK if successful (even if the signature is invalid)
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28 */
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29 int dsa_verify_hash_raw( void *r, void *s,
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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30 const unsigned char *hash, unsigned long hashlen,
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31 int *stat, dsa_key *key)
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32 {
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33 void *w, *v, *u1, *u2;
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34 int err;
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35
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36 LTC_ARGCHK(r != NULL);
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37 LTC_ARGCHK(s != NULL);
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38 LTC_ARGCHK(stat != NULL);
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39 LTC_ARGCHK(key != NULL);
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40
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41 /* default to invalid signature */
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42 *stat = 0;
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43
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44 /* init our variables */
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45 if ((err = mp_init_multi(&w, &v, &u1, &u2, NULL)) != CRYPT_OK) {
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46 return err;
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47 }
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48
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49 /* neither r or s can be null or >q*/
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50 if (mp_cmp_d(r, 0) != LTC_MP_GT || mp_cmp_d(s, 0) != LTC_MP_GT || mp_cmp(r, key->q) != LTC_MP_LT || mp_cmp(s, key->q) != LTC_MP_LT) {
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51 err = CRYPT_INVALID_PACKET;
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52 goto error;
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53 }
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54
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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55 /* FIPS 186-4 4.7: use leftmost min(bitlen(q), bitlen(hash)) bits of 'hash' */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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56 hashlen = MIN(hashlen, (unsigned long)(key->qord));
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57
285
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58 /* w = 1/s mod q */
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59 if ((err = mp_invmod(s, key->q, w)) != CRYPT_OK) { goto error; }
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60
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61 /* u1 = m * w mod q */
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62 if ((err = mp_read_unsigned_bin(u1, (unsigned char *)hash, hashlen)) != CRYPT_OK) { goto error; }
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63 if ((err = mp_mulmod(u1, w, key->q, u1)) != CRYPT_OK) { goto error; }
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64
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65 /* u2 = r*w mod q */
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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66 if ((err = mp_mulmod(r, w, key->q, u2)) != CRYPT_OK) { goto error; }
285
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67
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68 /* v = g^u1 * y^u2 mod p mod q */
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69 if ((err = mp_exptmod(key->g, u1, key->p, u1)) != CRYPT_OK) { goto error; }
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70 if ((err = mp_exptmod(key->y, u2, key->p, u2)) != CRYPT_OK) { goto error; }
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71 if ((err = mp_mulmod(u1, u2, key->p, v)) != CRYPT_OK) { goto error; }
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72 if ((err = mp_mod(v, key->q, v)) != CRYPT_OK) { goto error; }
285
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73
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74 /* if r = v then we're set */
382
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75 if (mp_cmp(r, v) == LTC_MP_EQ) {
285
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76 *stat = 1;
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77 }
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78
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79 err = CRYPT_OK;
382
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80 error:
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81 mp_clear_multi(w, v, u1, u2, NULL);
285
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82 return err;
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83 }
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84
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85 /**
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diff changeset
86 Verify a DSA signature
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87 @param sig The signature
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88 @param siglen The length of the signature (octets)
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 @param hash The hash that was signed
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 @param hashlen The length of the hash that was signed
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 @param stat [out] The result of the signature verification, 1==valid, 0==invalid
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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92 @param key The corresponding public DSA key
285
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
93 @return CRYPT_OK if successful (even if the signature is invalid)
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 int dsa_verify_hash(const unsigned char *sig, unsigned long siglen,
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
96 const unsigned char *hash, unsigned long hashlen,
285
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 int *stat, dsa_key *key)
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 {
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
99 int err;
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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diff changeset
100 void *r, *s;
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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101 ltc_asn1_list sig_seq[2];
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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102 unsigned long reallen = 0;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
103
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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104 LTC_ARGCHK(stat != NULL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
105 *stat = 0; /* must be set before the first return */
285
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
106
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
107 if ((err = mp_init_multi(&r, &s, NULL)) != CRYPT_OK) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
108 return err;
285
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parents:
diff changeset
109 }
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diff changeset
110
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diff changeset
111 LTC_SET_ASN1(sig_seq, 0, LTC_ASN1_INTEGER, r, 1UL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
112 LTC_SET_ASN1(sig_seq, 1, LTC_ASN1_INTEGER, s, 1UL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
113
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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114 err = der_decode_sequence(sig, siglen, sig_seq, 2);
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115 if (err != CRYPT_OK) {
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116 goto LBL_ERR;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
117 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
118
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
119 err = der_length_sequence(sig_seq, 2, &reallen);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
120 if (err != CRYPT_OK || reallen != siglen) {
285
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
121 goto LBL_ERR;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
122 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
123
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
124 /* do the op */
382
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Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
125 err = dsa_verify_hash_raw(r, s, hash, hashlen, stat, key);
285
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
126
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
127 LBL_ERR:
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
128 mp_clear_multi(r, s, NULL);
285
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
129 return err;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
130 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
131
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
132 #endif
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
133
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
134
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
135 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
136 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
137 /* commit time: $Format:%ai$ */