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pki: Add ssh_pki_signature_verify_blob().

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This commit is contained in:
Andreas Schneider
2011-08-22 16:27:38 +02:00
parent bcc0a6d0e0
commit 5cc98ed720
5 changed files with 179 additions and 0 deletions
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59
src/pki.c
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@@ -979,6 +979,65 @@ int ssh_pki_import_signature_blob(const ssh_string sig_blob,
return SSH_OK;
}
int ssh_pki_signature_verify_blob(ssh_session session,
ssh_string sig_blob)
{
unsigned char hash[SHA_DIGEST_LEN + 1] = {0};
ssh_signature sig;
ssh_key key;
int rc;
rc = ssh_pki_import_pubkey_blob(session->next_crypto->server_pubkey, &key);
if (rc < 0) {
return SSH_ERROR;
}
if (session->wanted_methods[SSH_HOSTKEYS]) {
if(!ssh_match_group(session->wanted_methods[SSH_HOSTKEYS],
key->type_c)) {
ssh_set_error(session,
SSH_FATAL,
"Public key from server (%s) doesn't match user "
"preference (%s)",
key->type_c,
session->wanted_methods[SSH_HOSTKEYS]);
ssh_key_free(key);
return -1;
}
}
rc = ssh_pki_import_signature_blob(sig_blob, key, &sig);
if (rc < 0) {
ssh_key_free(key);
return SSH_ERROR;
}
ssh_log(session,
SSH_LOG_FUNCTIONS,
"Going to verify a %s type signature",
key->type_c);
sha1(session->next_crypto->session_id,
session->next_crypto->digest_len,
hash + 1);
#ifdef DEBUG_CRYPTO
ssh_print_hexa("Hash to be verified with dsa", hash + 1, SHA_DIGEST_LEN);
#endif
rc = pki_signature_verify(session,
sig,
key,
hash,
SHA_DIGEST_LEN);
session->next_crypto->server_pubkey_type = key->type_c;
ssh_signature_free(sig);
ssh_key_free(key);
return rc;
}
/*
* This function signs the session id (known as H) as a string then
* the content of sigbuf */