gnutls_privkey_sign_hash(3) | gnutls | gnutls_privkey_sign_hash(3) |
gnutls_privkey_sign_hash - API function
#include <gnutls/abstract.h>
int gnutls_privkey_sign_hash(gnutls_privkey_t signer, gnutls_digest_algorithm_t hash_algo, unsigned int flags, const gnutls_datum_t * hash_data, gnutls_datum_t * signature);
This function will sign the given hashed data using a signature algorithm supported by the private key. Signature algorithms are always used together with a hash functions. Different hash functions may be used for the RSA algorithm, but only SHA-XXX for the DSA keys.
You may use gnutls_pubkey_get_preferred_hash_algorithm() to determine the hash algorithm.
The flags may be GNUTLS_PRIVKEY_SIGN_FLAG_TLS1_RSA or GNUTLS_PRIVKEY_SIGN_FLAG_RSA_PSS. In the former case this function will ignore hash_algo and perform a raw PKCS1 signature, and in the latter an RSA-PSS signature will be generated.
Note that, not all algorithm support signing already hashed data. When signing with Ed25519, gnutls_privkey_sign_data() should be used.
On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value.
2.12.0
Report bugs to <bugs@gnutls.org>.
Home page: https://www.gnutls.org
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