gnutls_privkey_sign_hash(3)         gnutls         gnutls_privkey_sign_hash(3)

NAME
       gnutls_privkey_sign_hash - API function

SYNOPSIS
       #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);

ARGUMENTS
       gnutls_privkey_t signer
                   Holds the signer's key

       gnutls_digest_algorithm_t hash_algo
                   The hash 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

DESCRIPTION
       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.

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

SINCE
       2.12.0

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


COPYRIGHT
       Copyright (C) 2001-2023 Free Software Foundation, Inc., and others.
       Copying and distribution of this file, with or without modification,
       are permitted in any medium without royalty provided the copyright
       notice and this notice are preserved.

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

       https://www.gnutls.org/manual/

gnutls                               3.8.5         gnutls_privkey_sign_hash(3)