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verify debug printing

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--HG--
branch : fuzz
This commit is contained in:
Matt Johnston 2017-06-20 20:07:25 +08:00
parent 8e1ea0f27b
commit 2cbe70ba34
1 changed files with 13 additions and 0 deletions
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13
dss.c
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@ -174,6 +174,13 @@ int buf_dss_verify(buffer* buf, dropbear_dss_key *key, buffer *data_buf) {
goto out;
}
#if DEBUG_DSS_VERIFY
printmpint("dss verify p", key->p);
printmpint("dss verify q", key->q);
printmpint("dss verify g", key->g);
printmpint("dss verify x", key->x);
#endif
/* hash the data */
sha1_init(&hs);
sha1_process(&hs, data_buf->data, data_buf->len);
@ -183,6 +190,9 @@ int buf_dss_verify(buffer* buf, dropbear_dss_key *key, buffer *data_buf) {
/* w = (s')-1 mod q */
/* let val1 = s' */
bytes_to_mp(&val1, (const unsigned char*) &string[SHA1_HASH_SIZE], SHA1_HASH_SIZE);
#if DEBUG_DSS_VERIFY
printmpint("dss verify s'", &val1);
#endif
if (mp_cmp(&val1, key->q) != MP_LT) {
TRACE(("verify failed, s' >= q"))
@ -200,6 +210,9 @@ int buf_dss_verify(buffer* buf, dropbear_dss_key *key, buffer *data_buf) {
/* u1 = ((SHA(M')w) mod q */
/* let val1 = SHA(M') = msghash */
bytes_to_mp(&val1, msghash, SHA1_HASH_SIZE);
#if DEBUG_DSS_VERIFY
printmpint("dss verify r'", &val1);
#endif
/* let val3 = u1 = ((SHA(M')w) mod q */
if (mp_mulmod(&val1, &val2, key->q, &val3) != MP_OKAY) {