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Simplify DSA signing process

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This commit is contained in:
Sara Golemon 2005-01-18 06:31:41 +00:00
parent d4677dba5b
commit a891971a63
1 changed files with 2 additions and 13 deletions
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15
src/hostkey.c
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@ -392,11 +392,9 @@ static int libssh2_hostkey_method_ssh_dss_sign(LIBSSH2_SESSION *session, unsigne
DSA_SIG *sig; DSA_SIG *sig;
unsigned char hash[SHA_DIGEST_LENGTH]; unsigned char hash[SHA_DIGEST_LENGTH];
SHA_CTX ctx; SHA_CTX ctx;
int r_len, s_len, rs_pad;
*signature = LIBSSH2_ALLOC(session, 2 * SHA_DIGEST_LENGTH); *signature = LIBSSH2_ALLOC(session, 2 * SHA_DIGEST_LENGTH);
*signature_len = 2 * SHA_DIGEST_LENGTH; *signature_len = 2 * SHA_DIGEST_LENGTH;
memset(*signature, 0, 2 * SHA_DIGEST_LENGTH);
if (!(*signature)) { if (!(*signature)) {
return -1; return -1;
@ -412,17 +410,8 @@ static int libssh2_hostkey_method_ssh_dss_sign(LIBSSH2_SESSION *session, unsigne
return -1; return -1;
} }
r_len = BN_num_bytes(sig->r); BN_bn2bin(sig->r, *signature);
s_len = BN_num_bytes(sig->s); BN_bn2bin(sig->s, *signature + SHA_DIGEST_LENGTH);
rs_pad = (2 * SHA_DIGEST_LENGTH) - (r_len + s_len);
if (rs_pad < 0) {
DSA_SIG_free(sig);
LIBSSH2_FREE(session, *signature);
return -1;
}
BN_bn2bin(sig->r, *signature + rs_pad);
BN_bn2bin(sig->s, *signature + rs_pad + r_len);
DSA_SIG_free(sig); DSA_SIG_free(sig);