doc/

2002-03-06  Marcus Brinkmann  <marcus@g10code.de>

	* gpgme.texi (Encrypting a Plaintext): Document symmetric
	encryption.

gpgme/
2002-03-06  Marcus Brinkmann  <marcus@g10code.de>

	* encrypt.c (_gpgme_encrypt_sym_status_handler): New function.
	(gpgme_op_encrypt_start): New variable SYMMETRIC, set it if RECP
	is null, and if it is set, use _gpgme_encrypt_sym_status_handler
	as status handler and run _gpgme_passphrase_start.
	* rungpg.c (_gpgme_gpg_op_encrypt): If RECP is zero, do symmetric
	encryption.
	* engine-gpgsm.c (_gpgme_gpgsm_op_encrypt): If RECP is zero,
	return error value.

	* rungpg.c (_gpgme_gpg_op_verify): Add "--" argument.

tests/
2002-03-06  Marcus Brinkmann  <marcus@g10code.de>

	* gpg/t-encrypt-sym.c: New file.
	* gpg/Makefile.am (TESTS): Add t-encrypt-sym.

NEWS

@@ -1,3 +1,12 @@
+ * gpgme_op_encrypt can be called with RECIPIENTS being 0.  In this
+   case, symmetric encryption is performed.  Note that this requires a
+   passphrase from the user.
+
+ * Interface changes relative to the 0.3.4 release:
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+gpgme_op_encrypt		EXTENDED: Symmetric encryption possible
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
 Noteworthy changes in version 0.3.4 (2002-03-04)
 ------------------------------------------------
 

doc/ChangeLog

@@ -1,3 +1,8 @@
+2002-03-06  Marcus Brinkmann  <marcus@g10code.de>
+
+	* gpgme.texi (Encrypting a Plaintext): Document symmetric
+	encryption.
+
 2002-03-06  Marcus Brinkmann  <marcus@g10code.de>
 
 	* gpgme.texi (Error Strings): Add example.

doc/gpgme.texi

@@ -2289,6 +2289,13 @@ encrypted for all valid recipients and returned in @var{cipher}.  More
 information about the invalid recipients is available with
 @code{gpgme_get_op_info}.  @xref{Detailed Results}.
 
+If @var{recp} is @code{NULL}, symmetric rather than public key
+encryption is performed.  Symmetrically encrypted cipher text can be
+deciphered with @code{gpgme_op_decrypt}.  Note that in this case the
+crypto backend needs to retrieve a passphrase from the user.
+Symmetric encryption is currently only supported for the OpenPGP
+crypto backend.
+
 The function returns @code{GPGME_No_Error} if the ciphertext could be
 created successfully, @code{GPGME_Invalid_Value} if @var{ctx},
 @var{rset}, @var{plain} or @var{cipher} is not a valid pointer,

gpgme/ChangeLog

@@ -1,3 +1,16 @@
+2002-03-06  Marcus Brinkmann  <marcus@g10code.de>
+
+	* encrypt.c (_gpgme_encrypt_sym_status_handler): New function.
+	(gpgme_op_encrypt_start): New variable SYMMETRIC, set it if RECP
+	is null, and if it is set, use _gpgme_encrypt_sym_status_handler
+	as status handler and run _gpgme_passphrase_start.
+	* rungpg.c (_gpgme_gpg_op_encrypt): If RECP is zero, do symmetric
+	encryption.
+	* engine-gpgsm.c (_gpgme_gpgsm_op_encrypt): If RECP is zero,
+	return error value.
+
+	* rungpg.c (_gpgme_gpg_op_verify): Add "--" argument.
+
 2002-03-03  Marcus Brinkmann  <marcus@g10code.de>
 
 	* passphrase.c (_gpgme_passphrase_status_handler): Also set the

gpgme/encrypt.c

@@ -135,11 +135,19 @@ _gpgme_encrypt_status_handler (GpgmeCtx ctx, GpgStatusCode code, char *args)
 }
 
 
+void
+_gpgme_encrypt_sym_status_handler (GpgmeCtx ctx, GpgStatusCode code, char *args)
+{
+  _gpgme_passphrase_status_handler (ctx, code, args);
+}
+
+
 GpgmeError
 gpgme_op_encrypt_start (GpgmeCtx ctx, GpgmeRecipients recp, GpgmeData plain,
 			GpgmeData ciph)
 {
   int err = 0;
+  int symmetric = 0;
 
   fail_on_pending_request (ctx);
   ctx->pending = 1;
@@ -147,9 +155,10 @@ gpgme_op_encrypt_start (GpgmeCtx ctx, GpgmeRecipients recp, GpgmeData plain,
   _gpgme_release_result (ctx);
 
   /* Do some checks.  */
-  if (!gpgme_recipients_count (recp))
+  if (!recp)
+    symmetric = 1;
+  else if (!gpgme_recipients_count (recp))
     {
-      /* Fixme: In this case we should do symmentric encryption.  */
       err = mk_error (No_Recipients);
       goto leave;
     }
@@ -162,7 +171,17 @@ gpgme_op_encrypt_start (GpgmeCtx ctx, GpgmeRecipients recp, GpgmeData plain,
   if (err)
     goto leave;
 
-  _gpgme_engine_set_status_handler (ctx->engine, _gpgme_encrypt_status_handler,
+  if (symmetric)
+    {
+      err = _gpgme_passphrase_start (ctx);
+      if (err)
+	goto leave;
+    }
+
+  _gpgme_engine_set_status_handler (ctx->engine,
+				    symmetric
+				    ? _gpgme_encrypt_sym_status_handler
+				    : _gpgme_encrypt_status_handler,
 				    ctx);
   _gpgme_engine_set_verbosity (ctx->engine, ctx->verbosity);
 

gpgme/engine-gpgsm.c

@@ -484,6 +484,8 @@ _gpgme_gpgsm_op_encrypt (GpgsmObject gpgsm, GpgmeRecipients recp,
 
   if (!gpgsm)
     return mk_error (Invalid_Value);
+  if (!recp)
+    return mk_error (Not_Implemented);
 
   gpgsm->command = xtrystrdup ("ENCRYPT");
   if (!gpgsm->command)

gpgme/rungpg.c

@@ -1308,18 +1308,23 @@ _gpgme_gpg_op_encrypt (GpgObject gpg, GpgmeRecipients recp,
 		       GpgmeData plain, GpgmeData ciph, int use_armor)
 {
   GpgmeError err;
+  int symmetric = !recp;
+
+  err = _gpgme_gpg_add_arg (gpg, symmetric ? "--symmetric" : "--encrypt");
 
-  err = _gpgme_gpg_add_arg (gpg, "--encrypt");
   if (!err && use_armor)
     err = _gpgme_gpg_add_arg (gpg, "--armor");
 
+  if (!symmetric)
+    {
       /* If we know that all recipients are valid (full or ultimate trust)
-   * we can suppress further checks */
+	 we can suppress further checks.  */
-  if (!err && _gpgme_recipients_all_valid (recp))
+      if (!err && !symmetric && _gpgme_recipients_all_valid (recp))
 	err = _gpgme_gpg_add_arg (gpg, "--always-trust");
 
       if (!err)
 	err = _gpgme_append_gpg_args_from_recipients (gpg, recp);
+    }
 
   /* Tell the gpg object about the data.  */
   if (!err)
@@ -1560,6 +1565,8 @@ _gpgme_gpg_op_verify (GpgObject gpg, GpgmeData sig, GpgmeData text)
       err = _gpgme_gpg_add_arg (gpg, "--output");
       if (!err)
 	err = _gpgme_gpg_add_arg (gpg, "-");
+      if (!err)
+	err = _gpgme_gpg_add_arg (gpg, "--");
       if (!err)
 	err = _gpgme_gpg_add_data (gpg, sig, 0);
       if (!err)

tests/ChangeLog

@@ -1,3 +1,8 @@
+2002-03-06  Marcus Brinkmann  <marcus@g10code.de>
+
+	* gpg/t-encrypt-sym.c: New file.
+	* gpg/Makefile.am (TESTS): Add t-encrypt-sym.
+
 2002-03-05  Marcus Brinkmann  <marcus@g10code.de>
 
 	* gpg/Makefile.am (CLEANFILES): Remove random_seed, which is now

tests/gpg/Makefile.am

@@ -23,8 +23,9 @@ GPG = @GPG@
 
 TESTS_ENVIRONMENT = GNUPGHOME=.
 
-TESTS = t-encrypt t-encrypt-sign t-sign t-signers t-decrypt t-verify \
+TESTS = t-encrypt t-encrypt-sym t-encrypt-sign t-sign t-signers	\
-	t-decrypt-verify t-keylist t-export t-import t-trustlist
+	t-decrypt t-verify t-decrypt-verify t-keylist t-export	\
+	t-import t-trustlist
 
 CLEANFILES = secring.gpg pubring.gpg trustdb.gpg
 DISTCLEANFILES = pubring.gpg~ random_seed

tests/gpg/t-encrypt-sym.c

@@ -0,0 +1,135 @@
+/* t-encrypt.c  - regression test
+ *	Copyright (C) 2000 Werner Koch (dd9jn)
+ *      Copyright (C) 2001 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME 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.
+ *
+ * GPGME 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include <gpgme.h>
+
+#define fail_if_err(a) do { if(a) {                                       \
+                               fprintf (stderr, "%s:%d: GpgmeError %s\n", \
+                                __FILE__, __LINE__, gpgme_strerror(a));   \
+                                exit (1); }                               \
+                             } while(0)
+
+static void
+print_data (GpgmeData dh)
+{
+  char buf[100];
+  size_t nread;
+  GpgmeError err;
+
+  err = gpgme_data_rewind (dh);
+  fail_if_err (err);
+  while (!(err = gpgme_data_read (dh, buf, 100, &nread)))
+    fwrite ( buf, nread, 1, stdout );
+  if (err != GPGME_EOF) 
+    fail_if_err (err);
+}
+
+
+static const char *
+passphrase_cb ( void *opaque, const char *desc, void **r_hd )
+{
+    const char *pass;
+
+    if ( !desc ) {
+        /* cleanup by looking at *r_hd */
+
+        
+        return NULL;
+    }
+
+    pass = "abc";
+    fprintf (stderr, "%% requesting passphrase for `%s': ", desc );
+    fprintf (stderr, "sending `%s'\n", pass );
+
+    return pass;
+}
+
+
+int 
+main (int argc, char **argv)
+{
+  GpgmeCtx ctx;
+  GpgmeError err;
+  GpgmeData plain, cipher;
+  const char *text = "Hallo Leute\n";
+  char *text2;
+  int i;
+
+  err = gpgme_check_engine ();
+  fail_if_err (err);
+
+  do
+    {
+      err = gpgme_new (&ctx);
+      fail_if_err (err);
+      gpgme_set_armor (ctx, 1);
+      if (!getenv("GPG_AGENT_INFO"))
+	gpgme_set_passphrase_cb (ctx, passphrase_cb, NULL);
+
+      err = gpgme_data_new_from_mem (&plain, text, strlen (text), 0);
+      fail_if_err (err);
+
+      err = gpgme_data_new (&cipher);
+      fail_if_err (err);
+
+      err = gpgme_op_encrypt (ctx, 0, plain, cipher);
+      fail_if_err (err);
+
+      fflush (NULL);
+      fputs ("Begin Result Encryption:\n", stdout);
+      print_data (cipher);
+      fputs ("End Result.\n", stdout);
+
+      err = gpgme_data_rewind (cipher);
+      fail_if_err (err);
+
+      gpgme_data_release (plain);
+      err = gpgme_data_new (&plain);
+      fail_if_err (err);
+
+      err = gpgme_op_decrypt (ctx, cipher, plain);
+      fail_if_err (err);
+
+      fputs ("Begin Result Decryption:\n", stdout);
+      print_data (plain);
+      fputs ("End Result.\n", stdout);
+
+      text2 = gpgme_data_release_and_get_mem (plain, &i);
+      if (strncmp (text, text2, i))
+	{
+	  fprintf (stderr, "%s:%d: Wrong plaintext\n", __FILE__, __LINE__);
+	  exit (1);
+	}
+
+      gpgme_data_release (cipher);
+      gpgme_release (ctx);
+    }
+  while (argc > 1 && !strcmp (argv[1], "--loop"));
+
+  return 0;
+}
+
+