1gnutls_privkey_sign_hash(3)         gnutls         gnutls_privkey_sign_hash(3)
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NAME

6       gnutls_privkey_sign_hash - API function
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SYNOPSIS

9       #include <gnutls/abstract.h>
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11       int gnutls_privkey_sign_hash(gnutls_privkey_t signer, gnutls_digest_al‐
12       gorithm_t  hash_algo,  unsigned  int  flags,  const  gnutls_datum_t   *
13       hash_data, gnutls_datum_t * signature);
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ARGUMENTS

16       gnutls_privkey_t signer
17                   Holds the signer's key
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19       gnutls_digest_algorithm_t hash_algo
20                   The hash algorithm used
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22       unsigned int flags
23                   Zero or one of gnutls_privkey_flags_t
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25       const gnutls_datum_t * hash_data
26                   holds the data to be signed
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28       gnutls_datum_t * signature
29                   will contain newly allocated signature
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DESCRIPTION

32       This  function  will sign the given hashed data using a signature algo‐
33       rithm supported by the private key.  Signature  algorithms  are  always
34       used  together  with a hash functions.  Different hash functions may be
35       used for the RSA algorithm, but only SHA-XXX for the DSA keys.
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37       You may use gnutls_pubkey_get_preferred_hash_algorithm()  to  determine
38       the hash algorithm.
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40       The     flags     may     be    GNUTLS_PRIVKEY_SIGN_FLAG_TLS1_RSA    or
41       GNUTLS_PRIVKEY_SIGN_FLAG_RSA_PSS.  In the  former  case  this  function
42       will  ignore   hash_algo  and perform a raw PKCS1 signature, and in the
43       latter an RSA-PSS signature will be generated.
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45       Note that, not all algorithm support signing already hashed data.  When
46       signing with Ed25519, gnutls_privkey_sign_data() should be used.
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RETURNS

49       On  success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative er‐
50       ror value.
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SINCE

53       2.12.0
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REPORTING BUGS

56       Report bugs to <bugs@gnutls.org>.
57       Home page: https://www.gnutls.org
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61       Copyright © 2001-2023 Free Software Foundation, Inc., and others.
62       Copying and distribution of this file, with  or  without  modification,
63       are  permitted in any medium without royalty provided the copyright no‐
64       tice and this notice are preserved.
65

SEE ALSO

67       The full documentation for gnutls is maintained as  a  Texinfo  manual.
68       If  the /usr/share/doc/gnutls/ directory does not contain the HTML form
69       visit
70
71       https://www.gnutls.org/manual/
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73gnutls                               3.8.2         gnutls_privkey_sign_hash(3)
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