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gnutls_privkey_sign_hash2 - Man Page

API function


#include <gnutls/abstract.h>

int gnutls_privkey_sign_hash2(gnutls_privkey_t signer, gnutls_sign_algorithm_t algo, unsigned int flags, const gnutls_datum_t * hash_data, gnutls_datum_t * signature);


gnutls_privkey_t signer

Holds the signer's key

gnutls_sign_algorithm_t algo

The signature algorithm used

unsigned int flags

Zero or one of gnutls_privkey_flags_t

const gnutls_datum_t * hash_data

holds the data to be signed

gnutls_datum_t * signature

will contain newly allocated signature


This function will sign the given hashed data using the specified signature algorithm. This function is an enhancement of gnutls_privkey_sign_hash(), as it allows utilizing a alternative signature algorithm where possible (e.g, use an RSA key with RSA-PSS).

The flags may be GNUTLS_PRIVKEY_SIGN_FLAG_TLS1_RSA. In that case this function will ignore  hash_algo and perform a raw PKCS1 signature. Note that this flag is supported since 3.6.9.

Note also that, not all algorithm support signing already hashed data. When signing with Ed25519, gnutls_privkey_sign_data2() should be used instead.


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