* genkey.c: Store the secret part and return the public part.

agent/genkey.c

@@ -0,0 +1,189 @@
+/* pksign.c - Generate a keypair
+ *	Copyright (C) 2002 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
+ */
+
+#include <config.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <assert.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+#include "agent.h"
+
+static int
+store_key (GCRY_SEXP private)
+{
+  int i;
+  char *fname;
+  FILE *fp;
+  char *buf;
+  size_t len;
+  unsigned char grip[20];
+  char hexgrip[41];
+  
+  if ( !gcry_pk_get_keygrip (private, grip) )
+    {
+      log_error ("can't calculate keygrip\n");
+      return seterr (General_Error);
+    }
+  for (i=0; i < 20; i++)
+    sprintf (hexgrip+2*i, "%02X", grip[i]);
+  hexgrip[40] = 0;
+
+  fname = make_filename (opt.homedir, "private-keys-v1.d", hexgrip, NULL);
+  if (!access (fname, F_OK))
+    {
+      log_error ("secret key file `%s' already exists - very strange\n",
+                 fname);
+      xfree (fname);
+      return seterr (General_Error);
+    }
+  fp = fopen (fname, "wbx");
+  if (!fp)
+    {
+      log_error ("can't create `%s': %s\n", fname, strerror (errno));
+      xfree (fname);
+      return seterr (File_Create_Error);
+    }
+
+  len = gcry_sexp_sprint (private, GCRYSEXP_FMT_CANON, NULL, 0);
+  assert (len);
+  buf = gcry_malloc_secure (len);
+  if (!buf)
+    {
+      fclose (fp);
+      remove (fname);
+      xfree (fname);
+      return seterr (Out_Of_Core);
+    }
+  len = gcry_sexp_sprint (private, GCRYSEXP_FMT_CANON, buf, len);
+  assert (len);
+
+  if (fwrite (buf, len, 1, fp) != 1)
+    {
+      log_error ("error writing `%s': %s\n", fname, strerror (errno));
+      fclose (fp);
+      remove (fname);
+      xfree (fname);
+      xfree (buf);
+      return seterr (File_Create_Error);
+    }
+  if ( fclose (fp) )
+    {
+      log_error ("error closing `%s': %s\n", fname, strerror (errno));
+      remove (fname);
+      xfree (fname);
+      xfree (buf);
+      return seterr (File_Create_Error);
+    }
+
+  xfree (fname);
+  xfree (buf);
+  return 0;
+}
+
+
+
+/* Generate a new keypair according to the parameters given in
+   KEYPARAM */
+int
+agent_genkey (CTRL ctrl, const char *keyparam, size_t keyparamlen,
+              FILE *outfp) 
+{
+  GCRY_SEXP s_keyparam, s_key, s_private, s_public;
+  int rc;
+  size_t len;
+  char *buf;
+
+  rc = gcry_sexp_sscan (&s_keyparam, NULL, keyparam, keyparamlen);
+  if (rc)
+    {
+      log_error ("failed to convert keyparam: %s\n", gcry_strerror (rc));
+      return seterr (Invalid_Data);
+    }
+
+  /* fixme: Get the passphrase now, cause key generation may take a while */
+
+  rc = gcry_pk_genkey (&s_key, s_keyparam );
+  gcry_sexp_release (s_keyparam);
+  if (rc)
+    {
+      log_error ("key generation failed: %s\n", gcry_strerror (rc));
+      return map_gcry_err (rc);
+    }
+
+  /* break out the parts */
+  s_private = gcry_sexp_find_token (s_key, "private-key", 0);
+  if (!s_private)
+    {
+      log_error ("key generation failed: invalid return value\n");
+      gcry_sexp_release (s_key);
+      return seterr (Invalid_Data);
+    }
+  s_public = gcry_sexp_find_token (s_key, "public-key", 0);
+  if (!s_public)
+    {
+      log_error ("key generation failed: invalid return value\n");
+      gcry_sexp_release (s_private);
+      gcry_sexp_release (s_key);
+      return seterr (Invalid_Data);
+    }
+  gcry_sexp_release (s_key); s_key = NULL;
+  
+  /* store the secret key */
+  log_debug ("storing private key\n");
+  rc = store_key (s_private);
+  gcry_sexp_release (s_private);
+  if (rc)
+    {
+      gcry_sexp_release (s_public);
+      return rc;
+    }
+
+  /* return the public key */
+  log_debug ("returning public key\n");
+  len = gcry_sexp_sprint (s_public, GCRYSEXP_FMT_CANON, NULL, 0);
+  assert (len);
+  buf = xmalloc (len);
+  if (!buf)
+    {
+      gcry_sexp_release (s_private);
+      gcry_sexp_release (s_public);
+      return seterr (Out_Of_Core);
+    }
+  len = gcry_sexp_sprint (s_public, GCRYSEXP_FMT_CANON, buf, len);
+  assert (len);
+  if (fwrite (buf, len, 1, outfp) != 1)
+    {
+      log_error ("error writing public key: %s\n", strerror (errno));
+      gcry_sexp_release (s_private);
+      gcry_sexp_release (s_public);
+      xfree (buf);
+      return seterr (File_Create_Error);
+    }
+  gcry_sexp_release (s_public);
+  xfree (buf);
+
+  return 0;
+}
+