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64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
/* sexputil.c - Utility fnctions for S-expressions.
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* Copyright (C) 2005 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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/* This file implements a few utility functions useful when working
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with canonical encrypted S-expresions (i.e. not the S-exprssion
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objects from libgcrypt). */
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#ifdef HAVE_LOCALE_H
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#include <locale.h>
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#endif
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#include "util.h"
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/* Return the so called "keygrip" which is the SHA-1 hash of the
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public key parameters expressed in a way depended on the algorithm.
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KEY is expected to be an canonical encoded S-expression with a
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public or private key. KEYLEN is the length of that buffer.
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GRIP must be at least 20 bytes long On success 0 is return, on
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error an aerror code. */
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gpg_error_t
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keygrip_from_canon_sexp (const unsigned char *key, size_t keylen,
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unsigned char *grip)
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{
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gpg_error_t err;
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gcry_sexp_t sexp;
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if (!grip)
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return gpg_error (GPG_ERR_INV_VALUE);
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err = gcry_sexp_sscan (&sexp, NULL, key, keylen);
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if (err)
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return err;
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if (!gcry_pk_get_keygrip (sexp, grip))
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err = gpg_error (GPG_ERR_INTERNAL);
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gcry_sexp_release (sexp);
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return err;
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}
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