Updated. (decode_pgp): Get rid of #ifdef PGP_PROGRAM's and handle

2001-01-09  Jeffrey Stedfast  <fejj@helixcode.com>

	* mail-format.c: Updated.
	(decode_pgp): Get rid of #ifdef PGP_PROGRAM's and handle
	appropriately.
	(handle_multipart_signed): Same.
	(handle_multipart_encrypted): Same.

	* Makefile.am: Added openpgp-utils.[c,h] to the build.

	* openpgp-utils.c: New source file containing all of the pgp
	interface code.

	* mail-crypto.c: Removed all of the openpgp funtions as they are
	being moved to a new file.
	(mail_crypto_is_rfc2015_signed): Renamed.
	(mail_crypto_is_rfc2015_encrypted): Renamed.

svn path=/trunk/; revision=7320

1 files changed, 1133 insertions, 0 deletions

diff --git a/mail/openpgp-utils.c b/mail/openpgp-utils.c
new file mode 100644
index 0000000000..1240a68188
--- /dev/null
+++ b/mail/openpgp-utils.c
@@ -0,0 +1,1133 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+/*
+ *  Authors: Nathan Thompson-Amato <ndt@jps.net>
+ *           Dan Winship <danw@helixcode.com>
+ *           Jeffrey Stedfast <fejj@helixcode.com>
+ *
+ *  Copyright (C) Helix Code, Inc. (www.helixcode.com)
+ *  
+ *  This program 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.
+ *  
+ *  This program 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.
+*/
+
+
+#ifdef HAVE_CONFIG_H
+#	include <config.h>
+#endif
+
+#include <gnome.h> /* for _() macro */
+#include "openpgp-utils.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <dirent.h>
+
+#include <signal.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <termios.h>
+#include <unistd.h>
+#include <signal.h>
+
+#define d(x)
+
+static const gchar *pgp_path = NULL;
+static PgpType pgp_type = PGP_TYPE_NONE;
+static PgpPasswdFunc pgp_passwd_func = NULL;
+static gpointer pgp_data = NULL;
+
+
+static gchar *
+pgp_get_passphrase (const gchar *userid)
+{
+	gchar *passphrase, *prompt, *type;
+	
+	switch (pgp_type) {
+	case PGP_TYPE_GPG:
+		type = "GnuPG";
+		break;
+	case PGP_TYPE_PGP5:
+		type = "PGP5";
+		break;
+	case PGP_TYPE_PGP2:
+		type = "PGP2.x";
+		break;
+	default:
+		type = "";
+	}
+	prompt = g_strdup_printf (_("Please enter your %s passphrase%s%s"),
+				  type, userid ? _(" for ") : "",
+				  userid ? userid : "");
+	
+	passphrase = pgp_passwd_func (prompt, pgp_data);
+	g_free (prompt);
+	
+	return passphrase;
+}
+
+
+/**
+ * openpgp_init:
+ * @path: path to pgp
+ * @type: pgp program type
+ * @callback: function to query for a passphrase
+ * @data: user data
+ *
+ * Initializes pgp variables
+ **/
+void
+openpgp_init (const gchar *path, PgpType type, PgpPasswdFunc callback, gpointer data)
+{
+	pgp_path = path;
+	pgp_type = type;
+	pgp_passwd_func = callback;
+	pgp_data = data;
+}
+
+
+/**
+ * openpgp_detect:
+ * @text: input text
+ *
+ * Returns TRUE if it is found that the text contains a PGP encrypted
+ * block otherwise returns FALSE.
+ **/
+gboolean
+openpgp_detect (const gchar *text)
+{
+	if (strstr (text, "-----BEGIN PGP MESSAGE-----"))
+		return TRUE;
+	return FALSE;
+}
+
+
+/**
+ * openpgp_sign_detect:
+ * @text: input text
+ *
+ * Returns TRUE if it is found that the text contains a PGP signed
+ * block otherwise returns FALSE.
+ **/
+gboolean
+openpgp_sign_detect (const gchar *text)
+{
+	if (strstr (text, "-----BEGIN PGP SIGNED MESSAGE-----"))
+		return TRUE;
+	return FALSE;
+}
+
+static int
+cleanup_child (pid_t child)
+{
+	int status;
+	pid_t wait_result;
+	sigset_t mask, omask;
+	
+	/* PGP5 closes fds before exiting, meaning this might be called
+	 * too early. So wait a bit for the result.
+	 */
+	sigemptyset (&mask);
+	sigaddset (&mask, SIGALRM);
+	sigprocmask (SIG_BLOCK, &mask, &omask);
+	alarm (1);
+	wait_result = waitpid (child, &status, 0);
+	alarm (0);
+	sigprocmask (SIG_SETMASK, &omask, NULL);
+	
+	if (wait_result == -1 && errno == EINTR) {
+		/* The child is hanging: send a friendly reminder. */
+		kill (child, SIGTERM);
+		sleep (1);
+		wait_result = waitpid (child, &status, WNOHANG);
+		if (wait_result == 0) {
+			/* Still hanging; use brute force. */
+			kill (child, SIGKILL);
+			sleep (1);
+			wait_result = waitpid (child, &status, WNOHANG);
+		}
+	}
+	
+	if (wait_result != -1 && WIFEXITED (status))
+		return WEXITSTATUS (status);
+	else
+		return -1;
+}
+
+static void
+cleanup_before_exec (int fd)
+{
+	int maxfd, i;
+	
+	maxfd = sysconf (_SC_OPEN_MAX);
+	if (maxfd < 0)
+		return;
+	
+	/* Loop over all fds. */
+	for (i = 0; i < maxfd; i++) {
+		if ((STDIN_FILENO != i) &&
+		    (STDOUT_FILENO != i) &&
+		    (STDERR_FILENO != i) &&
+		    (fd != i))
+			close (i);
+	}
+}
+
+static int
+crypto_exec_with_passwd (const char *path, char *argv[], const char *input, int inlen,
+			 int passwd_fds[], const char *passphrase,
+			 char **output, int *outlen, char **diagnostics)
+{
+	fd_set fdset, write_fdset;
+	int ip_fds[2], op_fds[2], diag_fds[2];
+	int select_result, read_len, write_len;
+	size_t tmp_len;
+	pid_t child;
+	char *buf, *diag_buf;
+	const char *passwd_next, *input_next;
+	size_t size, alloc_size, diag_size, diag_alloc_size;
+	gboolean eof_seen, diag_eof_seen, passwd_eof_seen, input_eof_seen;
+	size_t passwd_remaining, passwd_incr, input_remaining, input_incr;
+	struct timeval timeout;
+	
+	
+	if ((pipe (ip_fds) < 0 ) ||
+	    (pipe (op_fds) < 0 ) ||
+	    (pipe (diag_fds) < 0 )) {
+		*diagnostics = g_strdup_printf ("Couldn't create pipe to %s: "
+						"%s", pgp_path,
+						g_strerror (errno));
+		return 0;
+	}
+	
+	if (!(child = fork ())) {
+		/* In child */
+		
+		if ((dup2 (ip_fds[0], STDIN_FILENO) < 0 ) ||
+		    (dup2 (op_fds[1], STDOUT_FILENO) < 0 ) ||
+		    (dup2 (diag_fds[1], STDERR_FILENO) < 0 )) {
+			_exit (255);
+		}
+		
+		/* Dissociate from evolution-mail's controlling
+		 * terminal so that pgp/gpg won't be able to read from
+		 * it: PGP 2 will fall back to asking for the password
+		 * on /dev/tty if the passed-in password is incorrect.
+		 * This will make that fail rather than hanging.
+		 */
+		setsid ();
+		
+		/* Close excess fds */
+		cleanup_before_exec (passwd_fds[0]);
+		
+		execvp (path, argv);
+		fprintf (stderr, "Could not execute %s: %s\n", argv[0],
+			 g_strerror (errno));
+		_exit (255);
+	} else if (child < 0) {
+		*diagnostics = g_strdup_printf ("Cannot fork %s: %s",
+						argv[0], g_strerror (errno));
+		return 0;
+	}
+	
+	/* Parent */
+	close (ip_fds[0]);
+	close (op_fds[1]);
+	close (diag_fds[1]);
+	close (passwd_fds[0]);
+	
+	timeout.tv_sec = 10; /* timeout in seconds */
+	timeout.tv_usec = 0;
+	
+	size = diag_size = 0;
+	alloc_size = 4096;
+	diag_alloc_size = 1024;
+	eof_seen = diag_eof_seen = FALSE;
+	
+	buf = g_malloc (alloc_size);
+	diag_buf = g_malloc (diag_alloc_size);
+	
+	passwd_next = passphrase;
+	passwd_remaining = passphrase ? strlen (passphrase) : 0;
+	passwd_incr = fpathconf (passwd_fds[1], _PC_PIPE_BUF);
+	/* Use a reasonable default value on error. */
+	if (passwd_incr <= 0)
+		passwd_incr = 1024;
+	passwd_eof_seen = FALSE;
+	
+	input_next = input;
+	input_remaining = inlen;
+	input_incr = fpathconf (ip_fds[1], _PC_PIPE_BUF);
+	if (input_incr <= 0)
+		input_incr = 1024;
+	input_eof_seen = FALSE;
+	
+	while (!(eof_seen && diag_eof_seen)) {
+		FD_ZERO (&fdset);
+		if (!eof_seen)
+			FD_SET (op_fds[0], &fdset);
+		if (!diag_eof_seen)
+			FD_SET (diag_fds[0], &fdset);
+		
+		FD_ZERO (&write_fdset);
+		if (!passwd_eof_seen)
+			FD_SET (passwd_fds[1], &write_fdset);
+		if (!input_eof_seen)
+			FD_SET (ip_fds[1], &write_fdset);
+		
+		select_result = select (FD_SETSIZE, &fdset, &write_fdset,
+					NULL, &timeout);
+		if (select_result < 0) {
+			if (errno == EINTR)
+				continue;
+			break;
+		}
+		if (select_result == 0) {
+			/* timeout */
+			break;
+		}
+		
+		if (FD_ISSET (op_fds[0], &fdset)) {
+			/* More output is available. */
+			
+			if (size + 4096 > alloc_size) {
+				alloc_size += 4096;
+				buf = g_realloc (buf , alloc_size);
+			}
+			read_len = read (op_fds[0], &buf[size],
+					 alloc_size - size - 1);
+			if (read_len < 0) {
+				if (errno == EINTR)
+					continue;
+				break;
+			}
+			if (read_len == 0)
+				eof_seen = TRUE;
+			size += read_len;
+		}
+		
+		if (FD_ISSET(diag_fds[0], &fdset) ) {
+			/* More stderr is available. */
+			
+			if (diag_size + 1024 > diag_alloc_size) {
+				diag_alloc_size += 1024;
+				diag_buf = g_realloc (diag_buf,
+						      diag_alloc_size);
+			}
+			
+			read_len = read (diag_fds[0], &diag_buf[diag_size],
+					 diag_alloc_size - diag_size - 1);
+			if (read_len < 0) {
+				if (errno == EINTR)
+					continue;
+				break;
+			}
+			if (read_len == 0)
+				diag_eof_seen = TRUE;
+			diag_size += read_len;
+		}
+		
+		if (FD_ISSET(passwd_fds[1], &write_fdset)) {
+			/* Ready for more password input. */
+			
+			tmp_len = passwd_incr;
+			if (tmp_len > passwd_remaining)
+				tmp_len = passwd_remaining;
+			write_len = write (passwd_fds[1], passwd_next,
+					   tmp_len);
+			if (write_len < 0) {
+				if (errno == EINTR)
+					continue;
+				break;
+			}
+			passwd_next += write_len;
+			passwd_remaining -= write_len;
+			if (passwd_remaining == 0) {
+				close (passwd_fds[1]);
+				passwd_eof_seen = TRUE;
+			}
+		}
+		
+		if (FD_ISSET(ip_fds[1], &write_fdset)) {
+			/* Ready for more ciphertext input. */
+			
+			tmp_len = input_incr;
+			if (tmp_len > input_remaining)
+				tmp_len = input_remaining;
+			write_len = write (ip_fds[1], input_next, tmp_len);
+			if (write_len < 0) {
+				if (errno == EINTR)
+					continue;
+				break;
+			}
+			input_next += write_len;
+			input_remaining -= write_len;
+			if (input_remaining == 0 ) {
+				close (ip_fds[1]);
+				input_eof_seen = TRUE;
+			}
+		}
+	}
+	
+	buf[size] = 0;
+	diag_buf[diag_size] = 0;
+	close (op_fds[0]);
+	close (diag_fds[0]);
+	
+	*output = buf;
+	if (outlen)
+		*outlen = size;
+	*diagnostics = diag_buf;
+	
+	return cleanup_child (child);
+}
+
+/*----------------------------------------------------------------------*
+ *                     Public crypto functions
+ *----------------------------------------------------------------------*/
+
+/**
+ * openpgp_decrypt:
+ * @ciphertext: ciphertext to decrypt
+ * @cipherlen: ciphertext length
+ * @outlen: output length of the decrypted data (to be set by #openpgp_decrypt)
+ * @ex: exception
+ *
+ * Returns an allocated buffer containing the decrypted ciphertext. If
+ * the cleartext is plain text then you may treat it like a normal
+ * string as it will be NUL terminated, however #outlen is also set in
+ * the case that the cleartext is a binary stream.
+ **/
+gchar *
+openpgp_decrypt (const gchar *ciphertext, gint cipherlen, gint *outlen, CamelException *ex)
+{
+	char *argv[15];
+	char *plaintext = NULL;
+	char *diagnostics = NULL;
+	char *passphrase;
+	int passwd_fds[2];
+	char passwd_fd[32];
+	int retval, i;
+	
+	if (pgp_type == PGP_TYPE_NONE) {
+		camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+				      _("No GPG/PGP program available."));
+		return NULL;
+	}
+	
+	passphrase = pgp_get_passphrase (NULL);
+	if (!passphrase) {
+		camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+				      _("No password provided."));
+		return NULL;
+	}
+	
+	if (pipe (passwd_fds) < 0) {
+		camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+				      _("Couldn't create pipe to GPG/PGP: %s"),
+				      g_strerror (errno));
+		return NULL;
+	}
+	
+	i = 0;
+	switch (pgp_type) {
+	case PGP_TYPE_GPG:
+		argv[i++] = "gpg";
+		argv[i++] = "--verbose";
+		argv[i++] = "--yes";
+		argv[i++] = "--batch";
+		
+		argv[i++] = "--output";
+		argv[i++] = "-";            /* output to stdout */
+		
+		argv[i++] = "--decrypt";
+		
+		argv[i++] = "--passphrase-fd";
+		sprintf (passwd_fd, "%d", passwd_fds[0]);
+		argv[i++] = passwd_fd;
+		break;
+	case PGP_TYPE_PGP5:
+		argv[i++] = "pgpv";
+		argv[i++] = "-f";
+		argv[i++] = "+batchmode=1";
+		
+		sprintf (passwd_fd, "PGPPASSFD=%d", passwd_fds[0]);
+		putenv (passwd_fd);
+		break;
+	case PGP_TYPE_PGP2:
+		argv[i++] = "pgp";
+		argv[i++] = "-f";
+		
+		sprintf (passwd_fd, "PGPPASSFD=%d", passwd_fds[0]);
+		putenv (passwd_fd);
+		break;
+	default:
+		break;
+	}
+	
+	argv[i++] = NULL;
+	
+	retval = crypto_exec_with_passwd (pgp_path, argv,
+					  ciphertext, cipherlen,
+					  passwd_fds, passphrase,
+					  &plaintext, outlen,
+					  &diagnostics);
+	g_free (passphrase);
+	
+	if (retval != 0 || !*plaintext) {
+		camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+				      "%s", diagnostics);
+		g_free (plaintext);
+		g_free (diagnostics);
+		return NULL;
+	}
+	
+	g_free (diagnostics);
+	
+	return plaintext;
+}
+
+
+/**
+ * openpgp_encrypt:
+ * @in: data to encrypt
+ * @inlen: input length of input data
+ * @recipients: An array of recipient ids
+ * @sign: TRUE if you want to sign as well as encrypt
+ * @userid: userid to use when signing (assuming #sign is TRUE)
+ * @ex: exception
+ *
+ * Returns an allocated string containing the ciphertext.
+ **/
+gchar *
+openpgp_encrypt (const gchar *in, gint inlen, const GPtrArray *recipients,
+		 gboolean sign, const gchar *userid, CamelException *ex)
+{
+	GPtrArray *recipient_list = NULL;
+	GPtrArray *argv = NULL;
+	int retval, r;
+	char *ciphertext = NULL;
+	char *diagnostics = NULL;
+	int passwd_fds[2];
+	char passwd_fd[32];
+	char *passphrase = NULL;
+	
+	if (pgp_type == PGP_TYPE_NONE) {
+		camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+				      _("No GPG/PGP program available."));
+		return NULL;
+	}
+	
+	if (sign) {
+		/* we only need a passphrase if we intend on signing */
+		passphrase = pgp_get_passphrase (NULL);
+		if (!passphrase) {
+			camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM,
+					     _("No password provided."));
+			return NULL;
+		}
+	}
+	
+	if (pipe (passwd_fds) < 0) {
+		g_free (passphrase);
+		camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+				      _("Couldn't create pipe to GPG/PGP: %s"),
+				      g_strerror (errno));
+		return NULL;
+	}
+	
+	argv = g_ptr_array_new ();
+	switch (pgp_type) {
+	case PGP_TYPE_GPG:
+		if (recipients->len == 0) {
+			g_free (passphrase);
+			camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+					      _("No recipients specified"));
+			return NULL;
+		}
+		
+		recipient_list = g_ptr_array_new ();
+		for (r = 0; r < recipients->len; r++) {
+			char *buf, *recipient;
+			
+			recipient = recipients->pdata[r];
+			buf = g_strdup_printf ("-r %s", recipient);
+			g_ptr_array_add (recipient_list, buf);
+			g_free (recipient);
+		}
+		
+		g_ptr_array_add (argv, "gpg");
+		
+		g_ptr_array_add (argv, "--verbose");
+		g_ptr_array_add (argv, "--yes");
+		g_ptr_array_add (argv, "--batch");
+		
+		g_ptr_array_add (argv, "--armor");
+		
+		for (r = 0; r < recipient_list->len; r++)
+			g_ptr_array_add (argv, recipient_list->pdata[r]);
+		
+		g_ptr_array_add (argv, "--output");
+		g_ptr_array_add (argv, "-");            /* output to stdout */
+		
+		g_ptr_array_add (argv, "--encrypt");
+		
+		if (sign) {
+			g_ptr_array_add (argv, "--sign");
+			
+			g_ptr_array_add (argv, "-u");
+			g_ptr_array_add (argv, (gchar *) userid);
+			
+			g_ptr_array_add (argv, "--passphrase-fd");
+			sprintf (passwd_fd, "%d", passwd_fds[0]);
+			g_ptr_array_add (argv, passwd_fd);
+		}
+		break;
+	case PGP_TYPE_PGP5:
+		if (recipients->len == 0) {
+			g_free (passphrase);
+			camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+					      _("No recipients specified"));
+			return NULL;
+		}
+		
+		recipient_list = g_ptr_array_new ();
+		for (r = 0; r < recipients->len; r++) {
+			char *buf, *recipient;
+			
+			recipient = recipients->pdata[r];
+			buf = g_strdup_printf ("-r %s", recipient);
+			g_ptr_array_add (recipient_list, buf);
+			g_free (recipient);
+		}
+		
+		g_ptr_array_add (argv, "pgpe");
+		
+		for (r = 0; r < recipient_list->len; r++)
+			g_ptr_array_add (argv, recipient_list->pdata[r]);
+		
+		g_ptr_array_add (argv, "-f");
+		g_ptr_array_add (argv, "-z");
+		g_ptr_array_add (argv, "-a");
+		g_ptr_array_add (argv, "-o");
+		g_ptr_array_add (argv, "-");        /* output to stdout */
+		
+		if (sign) {
+			g_ptr_array_add (argv, "-s");
+			
+			g_ptr_array_add (argv, "-u");
+			g_ptr_array_add (argv, (gchar *) userid);
+			
+			sprintf (passwd_fd, "PGPPASSFD=%d", passwd_fds[0]);
+			putenv (passwd_fd);
+		}
+		break;
+	case PGP_TYPE_PGP2:
+		if (recipients->len == 0) {
+			g_free (passphrase);
+			camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+					      _("No recipients specified"));
+			return NULL;
+		}
+		
+		recipient_list = g_ptr_array_new ();
+		for (r = 0; r < recipients->len; r++) {
+			char *buf, *recipient;
+			
+			recipient = recipients->pdata[r];
+			buf = g_strdup (recipient);
+			g_ptr_array_add (recipient_list, buf);
+			g_free (recipient);
+		}
+		
+		g_ptr_array_add (argv, "pgp");
+		g_ptr_array_add (argv, "-f");
+		g_ptr_array_add (argv, "-e");
+		g_ptr_array_add (argv, "-a");
+		g_ptr_array_add (argv, "-o");
+		g_ptr_array_add (argv, "-");
+		
+		for (r = 0; r < recipient_list->len; r++)
+			g_ptr_array_add (argv, recipient_list->pdata[r]);
+		
+		if (sign) {
+			g_ptr_array_add (argv, "-s");
+			
+			g_ptr_array_add (argv, "-u");
+			g_ptr_array_add (argv, (gchar *) userid);
+			
+			sprintf (passwd_fd, "PGPPASSFD=%d", passwd_fds[0]);
+			putenv (passwd_fd);
+		}
+		break;
+	default:
+		break;
+	}
+	
+	g_ptr_array_add (argv, NULL);
+	
+	retval = crypto_exec_with_passwd (pgp_path, (char **) argv->pdata,
+					  in, inlen, passwd_fds,
+					  passphrase, &ciphertext, NULL,
+					  &diagnostics);
+	
+	g_free (passphrase);
+	g_ptr_array_free (argv, TRUE);
+	
+	if (retval != 0 || !*ciphertext) {
+		camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+				      "%s", diagnostics);
+		g_free (ciphertext);
+		ciphertext = NULL;
+	}
+	
+	if (recipient_list) {
+		for (r = 0; r < recipient_list->len; r++)
+			g_free (recipient_list->pdata[r]);
+		g_ptr_array_free (recipient_list, TRUE);
+	}
+	
+	g_free (diagnostics);
+	
+	return ciphertext;
+}
+
+
+/**
+ * openpgp_clearsign:
+ * @plaintext: plain readable text to clearsign
+ * @userid: userid to sign with
+ * @hash: Preferred hash function (md5 or sha1)
+ * @ex: exception
+ *
+ * Returns an allocated string containing the clearsigned plaintext
+ * using the preferred hash.
+ **/
+gchar *
+openpgp_clearsign (const gchar *plaintext, const gchar *userid,
+		   PgpHashType hash, CamelException *ex)
+{
+	char *argv[15];
+	char *ciphertext = NULL;
+	char *diagnostics = NULL;
+	char *passphrase = NULL;
+	char *hash_str = NULL;
+	int passwd_fds[2];
+	char passwd_fd[32];
+	int retval, i;
+	
+	if (pgp_type == PGP_TYPE_NONE) {
+		camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+				      _("No GPG/PGP program available."));
+		return NULL;
+	}
+	
+	passphrase = pgp_get_passphrase (userid);
+	if (!passphrase) {
+		camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM,
+				     _("No password provided."));
+		return NULL;
+	}
+	
+	if (pipe (passwd_fds) < 0) {
+		g_free (passphrase);
+		camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+				      _("Couldn't create pipe to GPG/PGP: %s"),
+				      g_strerror (errno));
+		return NULL;
+	}
+	
+	switch (hash) {
+	case PGP_HASH_TYPE_MD5:
+		hash_str = "MD5";
+		break;
+	case PGP_HASH_TYPE_SHA1:
+		hash_str = "SHA1";
+		break;
+	default:
+		break;
+	}
+	
+	i = 0;
+	switch (pgp_type) {
+	case PGP_TYPE_GPG:
+		argv[i++] = "gpg";
+		
+		argv[i++] = "--clearsign";
+		
+		if (hash_str) {
+			argv[i++] = "--digest-algo";
+			argv[i++] = hash_str;
+		}
+		
+		if (userid) {
+			argv[i++] = "-u";
+			argv[i++] = (char *) userid;
+		}
+		
+		argv[i++] = "--verbose";
+		argv[i++] = "--yes";
+		argv[i++] = "--batch";
+		
+		argv[i++] = "--armor";
+		
+		argv[i++] = "--output";
+		argv[i++] = "-";            /* output to stdout */
+		
+		argv[i++] = "--passphrase-fd";
+		sprintf (passwd_fd, "%d", passwd_fds[0]);
+		argv[i++] = passwd_fd;
+		break;
+	case PGP_TYPE_PGP5:
+		/* FIXME: modify to respect hash */
+		argv[i++] = "pgps";
+		
+		if (userid) {
+			argv[i++] = "-u";
+			argv[i++] = (char *) userid;
+		}
+		
+		argv[i++] = "-f";
+		argv[i++] = "-z";
+		argv[i++] = "-a";
+		argv[i++] = "-o";
+		argv[i++] = "-";        /* output to stdout */
+		
+		sprintf (passwd_fd, "PGPPASSFD=%d", passwd_fds[0]);
+		putenv (passwd_fd);
+		break;
+	case PGP_TYPE_PGP2:
+		/* FIXME: modify to respect hash */
+		argv[i++] = "pgp";
+		
+		if (userid) {
+			argv[i++] = "-u";
+			argv[i++] = (char *) userid;
+		}
+		
+		argv[i++] = "-f";
+		argv[i++] = "-a";
+		argv[i++] = "-o";
+		argv[i++] = "-";
+		
+		argv[i++] = "-st";
+		sprintf (passwd_fd, "PGPPASSFD=%d", passwd_fds[0]);
+		putenv (passwd_fd);
+		break;
+	default:
+		break;
+	}
+	
+	argv[i++] = NULL;
+	
+	retval = crypto_exec_with_passwd (pgp_path, argv,
+					  plaintext, strlen (plaintext),
+					  passwd_fds, passphrase,
+					  &ciphertext, NULL,
+					  &diagnostics);
+	
+	g_free (passphrase);
+	
+	if (retval != 0 || !*ciphertext) {
+		camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+				      "%s", diagnostics);
+		g_free (ciphertext);
+		ciphertext = NULL;
+	}
+	
+	g_free (diagnostics);
+	
+	return ciphertext;
+}
+
+
+/**
+ * openpgp_sign:
+ * @in: input data to sign
+ * @inlen: length of input data
+ * @userid: userid to sign with
+ * @hash: preferred hash type (md5 or sha1)
+ * @ex: exception
+ *
+ * Returns an allocated string containing the detached signature using
+ * the preferred hash.
+ **/
+gchar *
+openpgp_sign (const gchar *in, gint inlen, const gchar *userid,
+	      PgpHashType hash, CamelException *ex)
+{
+	char *argv[20];
+	char *ciphertext = NULL;
+	char *diagnostics = NULL;
+	char *passphrase = NULL;
+	char *hash_str = NULL;
+	int passwd_fds[2];
+	char passwd_fd[32];
+	int retval, i;
+	
+	if (pgp_type == PGP_TYPE_NONE) {
+		camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+				      _("No GPG/PGP program available."));
+		return NULL;
+	}
+	
+	passphrase = pgp_get_passphrase (userid);
+	if (!passphrase) {
+		camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM,
+				     _("No password provided."));
+		return NULL;
+	}
+	
+	if (pipe (passwd_fds) < 0) {
+		g_free (passphrase);
+		camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+				      _("Couldn't create pipe to GPG/PGP: %s"),
+				      g_strerror (errno));
+		return NULL;
+	}
+	
+	switch (hash) {
+	case PGP_HASH_TYPE_MD5:
+		hash_str = "MD5";
+		break;
+	case PGP_HASH_TYPE_SHA1:
+		hash_str = "SHA1";
+		break;
+	default:
+		break;
+	}
+	
+	i = 0;
+	switch (pgp_type) {
+	case PGP_TYPE_GPG:
+		argv[i++] = "gpg";
+		
+		argv[i++] = "--sign";
+		argv[i++] = "-b";
+		if (hash_str) {
+			argv[i++] = "--digest-algo";
+			argv[i++] = hash_str;
+		}
+		
+		if (userid) {
+			argv[i++] = "-u";
+			argv[i++] = (char *) userid;
+		}
+		
+		argv[i++] = "--verbose";
+		argv[i++] = "--yes";
+		argv[i++] = "--batch";
+		
+		argv[i++] = "--armor";
+		
+		argv[i++] = "--output";
+		argv[i++] = "-";            /* output to stdout */
+		
+		argv[i++] = "--passphrase-fd";
+		sprintf (passwd_fd, "%d", passwd_fds[0]);
+		argv[i++] = passwd_fd;
+		break;
+	case PGP_TYPE_PGP5:
+		/* FIXME: respect hash */
+		argv[i++] = "pgps";
+		
+		if (userid) {
+			argv[i++] = "-u";
+			argv[i++] = (char *) userid;
+		}
+		
+		argv[i++] = "-b";
+		argv[i++] = "-f";
+		argv[i++] = "-z";
+		argv[i++] = "-a";
+		argv[i++] = "-o";
+		argv[i++] = "-";        /* output to stdout */
+		
+		sprintf (passwd_fd, "PGPPASSFD=%d", passwd_fds[0]);
+		putenv (passwd_fd);
+		break;
+	case PGP_TYPE_PGP2:
+		/* FIXME: respect hash */
+		argv[i++] = "pgp";
+		
+		if (userid) {
+			argv[i++] = "-u";
+			argv[i++] = (char *) userid;
+		}
+		
+		argv[i++] = "-f";
+		argv[i++] = "-a";
+		argv[i++] = "-o";
+		argv[i++] = "-";
+		
+		argv[i++] = "-sb"; /* create a detached signature */
+		sprintf (passwd_fd, "PGPPASSFD=%d", passwd_fds[0]);
+		putenv (passwd_fd);
+		break;
+	default:
+		break;
+	}
+	
+	argv[i++] = NULL;
+	
+	retval = crypto_exec_with_passwd (pgp_path, argv,
+					  in, inlen,
+					  passwd_fds, passphrase,
+					  &ciphertext, NULL,
+					  &diagnostics);
+	
+	g_free (passphrase);
+	
+	if (retval != 0 || !*ciphertext) {
+		camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+				      "%s", diagnostics);
+		g_free (ciphertext);
+		ciphertext = NULL;
+	}
+	
+	g_free (diagnostics);
+	
+	return ciphertext;
+}
+
+static char *
+swrite (const char *data, int len)
+{
+	char *template;
+	int fd;
+	
+	template = g_strdup ("/tmp/gmime-crypto-XXXXXX");
+	fd = mkstemp (template);
+	if (fd == -1) {
+		g_free (template);
+		return NULL;
+	}
+	
+	write (fd, data, len);
+	close (fd);
+	
+	return template;
+}
+
+gboolean
+openpgp_verify (const gchar *in, gint inlen, const gchar *sigin, gint siglen, CamelException *ex)
+{
+	char *argv[20];
+	char *cleartext = NULL;
+	char *diagnostics = NULL;
+	int passwd_fds[2];
+	char passwd_fd[32];
+	char *sigfile = NULL;
+	int retval, i, clearlen;
+	gboolean valid = TRUE;
+	
+	
+	if (pgp_type == PGP_TYPE_NONE) {
+		camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+				      _("No GPG/PGP program available."));
+		return FALSE;
+	}
+	
+	if (pipe (passwd_fds) < 0) {
+		camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+				      _("Couldn't create pipe to GPG/PGP: %s"),
+				      g_strerror (errno));
+		return FALSE;
+	}
+	
+	if (sigin != NULL && siglen) {
+		/* We are going to verify a detached signature so save
+		   the signature to a temp file. */
+		sigfile = swrite (sigin, siglen);
+		if (!sigfile) {
+			camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+					      _("Couldn't create temp file: %s"),
+					      g_strerror (errno));
+			return FALSE;
+		}
+	}
+	
+	i = 0;
+	switch (pgp_type) {
+	case PGP_TYPE_GPG:
+		argv[i++] = "gpg";
+		
+		argv[i++] = "--verify";
+		
+		if (sigin != NULL && siglen)
+			argv[i++] = sigfile;
+		
+		argv[i++] = "-";
+		
+		/*argv[i++] = "--verbose";*/
+		/*argv[i++] = "--yes";*/
+		/*argv[i++] = "--batch";*/
+		break;
+	case PGP_TYPE_PGP5:
+		argv[i++] = "pgpv";
+		
+		argv[i++] = "-z";
+		
+		if (sigin != NULL && siglen)
+			argv[i++] = sigfile;
+		
+		argv[i++] = "-f";
+		
+		break;
+	case PGP_TYPE_PGP2:
+		argv[i++] = "pgp";
+		
+		if (sigin != NULL && siglen)
+			argv[i++] = sigfile;
+		
+		argv[i++] = "-f";
+		
+		break;
+	default:
+		break;
+	}
+	
+	argv[i++] = NULL;
+	
+	clearlen = 0;
+	retval = crypto_exec_with_passwd (pgp_path, argv,
+					  in, inlen,
+					  passwd_fds, NULL,
+					  &cleartext, &clearlen,
+					  &diagnostics);
+	
+	/* cleanup */
+	if (sigfile) {
+		unlink (sigfile);
+		g_free (sigfile);
+	}
+	
+	/* FIXME: maybe we should always set an exception? */
+	if (retval != 0) {
+		camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
+				      "%s", diagnostics);
+		valid = FALSE;
+	}
+	
+	g_free (diagnostics);
+	g_free (cleartext);
+	
+	return valid;
+}