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 © 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/