gnutls_privkey_sign_data - Man Page

API function


#include <gnutls/abstract.h>

int gnutls_privkey_sign_data(gnutls_privkey_t signer, gnutls_digest_algorithm_t hash, unsigned int flags, const gnutls_datum_t * data, gnutls_datum_t * signature);


gnutls_privkey_t signer

Holds the key

gnutls_digest_algorithm_t hash

should be a digest algorithm

unsigned int flags

Zero or one of gnutls_privkey_flags_t

const gnutls_datum_t * data

holds the data to be signed

gnutls_datum_t * signature

will contain the signature allocated with gnutls_malloc()


This function will sign the given 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 the SHA family for the DSA keys.

You may use gnutls_pubkey_get_preferred_hash_algorithm() to determine the hash algorithm.


On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value.



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See Also

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3.8.3 gnutls