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gnutls_x509_privkey_sign_data - Man Page

API function


#include <gnutls/x509.h>

int gnutls_x509_privkey_sign_data(gnutls_x509_privkey_t key, gnutls_digest_algorithm_t digest, unsigned int flags, const gnutls_datum_t * data, void * signature, size_t * signature_size);


gnutls_x509_privkey_t key

a key

gnutls_digest_algorithm_t digest

should be a digest algorithm

unsigned int flags

should be 0 for now

const gnutls_datum_t * data

holds the data to be signed

void * signature

will contain the signature

size_t * signature_size

holds the size of signature (and will be replaced by the new size)


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 SHA-1 for the DSA keys.

If the buffer provided is not long enough to hold the output, then * signature_size is updated and GNUTLS_E_SHORT_MEMORY_BUFFER will be returned.

Use gnutls_x509_crt_get_preferred_hash_algorithm() to determine the hash algorithm.


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

Reporting Bugs

Report bugs to <bugs@gnutls.org>.
Home page: https://www.gnutls.org

See Also

The full documentation for gnutls is maintained as a Texinfo manual. If the /usr/share/doc/gnutls/ directory does not contain the HTML form visit



3.8.6 gnutls