Mercurial > dropbear

annotate libtomcrypt/src/pk/dsa/dsa_verify_hash.c @ 285:1b9e69c058d2

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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3) to branch 'au.asn.ucc.matt.dropbear' (head fdf4a7a3b97ae5046139915de7e40399cceb2c01)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:58 +0000
parents
children 0cbe8f6dbf9e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
2 *
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
3 * LibTomCrypt is a library that provides various cryptographic
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
4 * algorithms in a highly modular and flexible manner.
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
5 *
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
6 * The library is free for all purposes without any express
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
7 * guarantee it works.
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
8 *
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
9 * Tom St Denis, [email protected], http://libtomcrypt.org
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
10 */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
11 #include "tomcrypt.h"
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Matt Johnston <matt@ucc.asn.au>
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12
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
13 /**
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
14 @file dsa_verify_hash.c
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
15 DSA implementation, verify a signature, Tom St Denis
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
16 */
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Matt Johnston <matt@ucc.asn.au>
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17
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
18
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
19 #ifdef MDSA
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20
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
21 /**
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
22 Verify a DSA signature
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
23 @param r DSA "r" parameter
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Matt Johnston <matt@ucc.asn.au>
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24 @param s DSA "s" parameter
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Matt Johnston <matt@ucc.asn.au>
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25 @param hash The hash that was signed
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Matt Johnston <matt@ucc.asn.au>
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26 @param hashlen The length of the hash that was signed
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
27 @param stat [out] The result of the signature verification, 1==valid, 0==invalid
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Matt Johnston <matt@ucc.asn.au>
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28 @param key The corresponding public DH key
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
29 @return CRYPT_OK if successful (even if the signature is invalid)
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
30 */
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
31 int dsa_verify_hash_raw( mp_int *r, mp_int *s,
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
32 const unsigned char *hash, unsigned long hashlen,
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Matt Johnston <matt@ucc.asn.au>
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33 int *stat, dsa_key *key)
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Matt Johnston <matt@ucc.asn.au>
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34 {
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
35 mp_int w, v, u1, u2;
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
36 int err;
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37
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
38 LTC_ARGCHK(r != NULL);
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
39 LTC_ARGCHK(s != NULL);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
40 LTC_ARGCHK(stat != NULL);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
41 LTC_ARGCHK(key != NULL);
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Matt Johnston <matt@ucc.asn.au>
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42
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
43 /* default to invalid signature */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
44 *stat = 0;
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45
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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46 /* init our variables */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
47 if ((err = mp_init_multi(&w, &v, &u1, &u2, NULL)) != MP_OKAY) {
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
48 return mpi_to_ltc_error(err);
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Matt Johnston <matt@ucc.asn.au>
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49 }
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diff changeset
50
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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51 /* neither r or s can be null or >q*/
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
52 if (mp_iszero(r) == MP_YES || mp_iszero(s) == MP_YES || mp_cmp(r, &key->q) != MP_LT || mp_cmp(s, &key->q) != MP_LT) {
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
53 err = CRYPT_INVALID_PACKET;
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54 goto done;
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Matt Johnston <matt@ucc.asn.au>
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55 }
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Matt Johnston <matt@ucc.asn.au>
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56
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
57 /* w = 1/s mod q */
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Matt Johnston <matt@ucc.asn.au>
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58 if ((err = mp_invmod(s, &key->q, &w)) != MP_OKAY) { goto error; }
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Matt Johnston <matt@ucc.asn.au>
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59
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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diff changeset
60 /* u1 = m * w mod q */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
61 if ((err = mp_read_unsigned_bin(&u1, (unsigned char *)hash, hashlen)) != MP_OKAY) { goto error; }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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62 if ((err = mp_mulmod(&u1, &w, &key->q, &u1)) != MP_OKAY) { goto error; }
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Matt Johnston <matt@ucc.asn.au>
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63
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
64 /* u2 = r*w mod q */
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Matt Johnston <matt@ucc.asn.au>
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65 if ((err = mp_mulmod(r, &w, &key->q, &u2)) != MP_OKAY) { goto error; }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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66
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
67 /* v = g^u1 * y^u2 mod p mod q */
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
68 if ((err = mp_exptmod(&key->g, &u1, &key->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
69 if ((err = mp_exptmod(&key->y, &u2, &key->p, &u2)) != MP_OKAY) { goto error; }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
70 if ((err = mp_mulmod(&u1, &u2, &key->p, &v)) != 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
71 if ((err = mp_mod(&v, &key->q, &v)) != 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
72
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
73 /* if r = v then we're set */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
74 if (mp_cmp(r, &v) == MP_EQ) {
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
75 *stat = 1;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
76 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
77
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
78 err = CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
79 goto done;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
80
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
81 error : 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
82 done : mp_clear_multi(&w, &v, &u1, &u2, NULL);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
83 return err;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
84 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
85
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86 /**
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Matt Johnston <matt@ucc.asn.au>
parents:
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87 Verify a DSA signature
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Matt Johnston <matt@ucc.asn.au>
parents:
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88 @param sig The signature
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Matt Johnston <matt@ucc.asn.au>
parents:
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89 @param siglen The length of the signature (octets)
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Matt Johnston <matt@ucc.asn.au>
parents:
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90 @param hash The hash that was signed
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Matt Johnston <matt@ucc.asn.au>
parents:
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91 @param hashlen The length of the hash that was signed
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Matt Johnston <matt@ucc.asn.au>
parents:
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92 @param stat [out] The result of the signature verification, 1==valid, 0==invalid
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Matt Johnston <matt@ucc.asn.au>
parents:
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93 @param key The corresponding public DH key
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Matt Johnston <matt@ucc.asn.au>
parents:
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94 @return CRYPT_OK if successful (even if the signature is invalid)
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Matt Johnston <matt@ucc.asn.au>
parents:
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95 */
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Matt Johnston <matt@ucc.asn.au>
parents:
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96 int dsa_verify_hash(const unsigned char *sig, unsigned long siglen,
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Matt Johnston <matt@ucc.asn.au>
parents:
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97 const unsigned char *hash, unsigned long hashlen,
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Matt Johnston <matt@ucc.asn.au>
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98 int *stat, dsa_key *key)
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Matt Johnston <matt@ucc.asn.au>
parents:
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99 {
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Matt Johnston <matt@ucc.asn.au>
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100 int err;
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Matt Johnston <matt@ucc.asn.au>
parents:
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101 mp_int r, s;
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Matt Johnston <matt@ucc.asn.au>
parents:
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102
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Matt Johnston <matt@ucc.asn.au>
parents:
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103 if ((err = mp_init_multi(&r, &s, NULL)) != CRYPT_OK) {
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Matt Johnston <matt@ucc.asn.au>
parents:
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104 return CRYPT_MEM;
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Matt Johnston <matt@ucc.asn.au>
parents:
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105 }
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Matt Johnston <matt@ucc.asn.au>
parents:
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106
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Matt Johnston <matt@ucc.asn.au>
parents:
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107 /* decode the sequence */
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Matt Johnston <matt@ucc.asn.au>
parents:
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108 if ((err = der_decode_sequence_multi(sig, siglen,
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Matt Johnston <matt@ucc.asn.au>
parents:
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109 LTC_ASN1_INTEGER, 1UL, &r,
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Matt Johnston <matt@ucc.asn.au>
parents:
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110 LTC_ASN1_INTEGER, 1UL, &s,
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Matt Johnston <matt@ucc.asn.au>
parents:
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111 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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Matt Johnston <matt@ucc.asn.au>
parents:
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112 goto LBL_ERR;
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Matt Johnston <matt@ucc.asn.au>
parents:
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113 }
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Matt Johnston <matt@ucc.asn.au>
parents:
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114
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Matt Johnston <matt@ucc.asn.au>
parents:
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115 /* do the op */
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Matt Johnston <matt@ucc.asn.au>
parents:
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116 err = dsa_verify_hash_raw(&r, &s, hash, hashlen, stat, key);
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Matt Johnston <matt@ucc.asn.au>
parents:
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117
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Matt Johnston <matt@ucc.asn.au>
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118 LBL_ERR:
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Matt Johnston <matt@ucc.asn.au>
parents:
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119 mp_clear_multi(&r, &s, NULL);
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Matt Johnston <matt@ucc.asn.au>
parents:
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120 return err;
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Matt Johnston <matt@ucc.asn.au>
parents:
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121 }
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Matt Johnston <matt@ucc.asn.au>
parents:
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122
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Matt Johnston <matt@ucc.asn.au>
parents:
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123 #endif
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Matt Johnston <matt@ucc.asn.au>
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124
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Matt Johnston <matt@ucc.asn.au>
parents:
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125
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Matt Johnston <matt@ucc.asn.au>
parents:
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126 /* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_verify_hash.c,v $ */
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Matt Johnston <matt@ucc.asn.au>
parents:
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127 /* $Revision: 1.8 $ */
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Matt Johnston <matt@ucc.asn.au>
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128 /* $Date: 2005/05/15 21:48:59 $ */