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- Add hmac-sha2-256 and hmac-sha2-512. Needs debugging, seems to be

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getting keyed incorrectly

--HG--
branch : sha2
This commit is contained in:
Matt Johnston
2012-05-10 08:38:37 +08:00
parent 10d7a35841
commit c62e53807f
5 changed files with 52 additions and 11 deletions
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14
common-kex.c
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@@ -248,26 +248,28 @@ static void kexinitialise() {
* already initialised hash_state hs, which should already have processed
* the dh_K and hash, since these are common. X is the letter 'A', 'B' etc.
* out must have at least min(SHA1_HASH_SIZE, outlen) bytes allocated.
* The output will only be expanded once, as we are assured that
* outlen <= 2*SHA1_HASH_SIZE for all known hashes.
*
* See Section 7.2 of rfc4253 (ssh transport) for details */
static void hashkeys(unsigned char *out, int outlen,
const hash_state * hs, const unsigned char X) {
hash_state hs2;
unsigned char k2[SHA1_HASH_SIZE]; /* used to extending */
int offset;
memcpy(&hs2, hs, sizeof(hash_state));
sha1_process(&hs2, &X, 1);
sha1_process(&hs2, ses.session_id, SHA1_HASH_SIZE);
sha1_done(&hs2, out);
if (SHA1_HASH_SIZE < outlen) {
for (offset = SHA1_HASH_SIZE;
offset < outlen;
offset += SHA1_HASH_SIZE)
{
/* need to extend */
unsigned char k2[SHA1_HASH_SIZE];
memcpy(&hs2, hs, sizeof(hash_state));
sha1_process(&hs2, out, SHA1_HASH_SIZE);
sha1_process(&hs2, out, offset);
sha1_done(&hs2, k2);
memcpy(&out[SHA1_HASH_SIZE], k2, outlen - SHA1_HASH_SIZE);
memcpy(&out[offset], k2, MIN(outlen - offset, SHA1_HASH_SIZE));
}
}