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get_micalg (from mutt)
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Authored by • werner on Feb 14 2018, 12:18 PM.
/* Find the "micalg" parameter from the last Gpgme operation on
context CTX. It is expected that this operation was a sign
operation. Return the algorithm name as a C string in buffer BUF
which must have been allocated by the caller with size BUFLEN.
Returns 0 on success or -1 in case of an error. The return string
is truncted to BUFLEN - 1. */
static int get_micalg (gpgme_ctx_t ctx, int use_smime, char *buf, size_t buflen)
{
gpgme_sign_result_t result = NULL;
const char *algorithm_name = NULL;
if (buflen < 5)
return -1;
*buf = 0;
result = gpgme_op_sign_result (ctx);
if (result && result->signatures)
{
algorithm_name = gpgme_hash_algo_name (result->signatures->hash_algo);
if (algorithm_name)
{
if (use_smime)
{
/* convert GPGME raw hash name to RFC 2633 format */
snprintf (buf, buflen, "%s", algorithm_name);
ascii_strlower (buf);
} else {
/* convert GPGME raw hash name to RFC 3156 format */
snprintf (buf, buflen, "pgp-%s", algorithm_name);
ascii_strlower (buf + 4);
}
}
}
return *buf? 0:-1;
}