Added missing file

common/sexputil.c

@@ -0,0 +1,63 @@
+/* sexputil.c - Utility fnctions for S-expressions.
+ * Copyright (C) 2005 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+/* This file implements a few utility functions useful when working
+   with canonical encrypted S-expresions (i.e. not the S-exprssion
+   objects from libgcrypt).  */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#ifdef HAVE_LOCALE_H
+#include <locale.h>
+#endif
+
+#include "util.h"
+
+
+/* Return the so called "keygrip" which is the SHA-1 hash of the
+   public key parameters expressed in a way depended on the algorithm.
+
+   KEY is expected to be an canonical encoded S-expression with a
+   public or private key. KEYLEN is the length of that buffer.
+
+   GRIP must be at least 20 bytes long On success 0 is return, on
+   error an aerror code. */
+gpg_error_t
+keygrip_from_canon_sexp (const unsigned char *key, size_t keylen,
+                         unsigned char *grip)
+{
+  gpg_error_t err;
+  gcry_sexp_t sexp;
+
+  if (!grip)
+    return gpg_error (GPG_ERR_INV_VALUE);
+  err = gcry_sexp_sscan (&sexp, NULL, key, keylen);
+  if (err)
+    return err;
+  if (!gcry_pk_get_keygrip (sexp, grip))
+    err = gpg_error (GPG_ERR_INTERNAL);
+  gcry_sexp_release (sexp);
+  return err;
+}
+