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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_algo-
     rithm_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/local/share/doc/gnutls/ directory does not contain the  HTML  form
     visit

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

gnutls				     3.8.13	     gnutls_privkey_sign_hash(3)

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