1 files changed, 438 insertions, 0 deletions
diff --git a/camel/camel-cipher-context.c b/camel/camel-cipher-context.c
new file mode 100644
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+++ b/camel/camel-cipher-context.c
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+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+/*
+ *  Authors: Jeffrey Stedfast <fejj@ximian.com>
+ *
+ *  Copyright 2001 Ximian, Inc. (www.ximian.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 Street #330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "camel-cipher-context.h"
+
+#include <glib.h>
+
+#include <iconv.h>
+
+#ifdef ENABLE_THREADS
+#include <pthread.h>
+#define CIPHER_LOCK(ctx)   g_mutex_lock (((CamelCipherContext *) ctx)->priv->lock)
+#define CIPHER_UNLOCK(ctx) g_mutex_unlock (((CamelCipherContext *) ctx)->priv->lock);
+#else
+#define CIPHER_LOCK(ctx)
+#define CIPHER_UNLOCK(ctx)
+#endif
+
+#define d(x)
+
+#define CCCC(k) CAMEL_CIPHER_CONTEXT_CLASS (k)
+
+struct _CamelCipherContextPrivate {
+#ifdef ENABLE_THREADS
+	GMutex *lock;
+#endif
+};
+
+static int                  cipher_sign (CamelCipherContext *ctx, const char *userid, CamelCipherHash hash,
+					 CamelStream *istream, CamelStream *ostream, CamelException *ex);
+static int                  cipher_clearsign (CamelCipherContext *context, const char *userid, CamelCipherHash hash,
+					      CamelStream *istream, CamelStream *ostream, CamelException *ex);
+static CamelCipherValidity *cipher_verify (CamelCipherContext *context, CamelStream *istream,
+					   CamelStream *sigstream, CamelException *ex);
+static int                  cipher_encrypt (CamelCipherContext *context, gboolean sign, const char *userid,
+					    GPtrArray *recipients, CamelStream *istream, CamelStream *ostream,
+					    CamelException *ex);
+static int                  cipher_decrypt (CamelCipherContext *context, CamelStream *istream, CamelStream *ostream,
+					    CamelException *ex);
+
+static CamelObjectClass *parent_class;
+
+static void
+camel_cipher_context_init (CamelCipherContext *context)
+{
+	context->priv = g_new0 (struct _CamelCipherContextPrivate, 1);
+#ifdef ENABLE_THREADS
+	context->priv->lock = g_mutex_new ();
+#endif
+}
+
+static void
+camel_cipher_context_finalise (CamelObject *o)
+{
+	CamelCipherContext *context = (CamelCipherContext *)o;
+	
+	camel_object_unref (CAMEL_OBJECT (context->session));
+	
+#ifdef ENABLE_THREADS
+	g_mutex_free (context->priv->lock);
+#endif
+	
+	g_free (context->priv);
+}
+
+static void
+camel_cipher_context_class_init (CamelCipherContextClass *camel_cipher_context_class)
+{
+	parent_class = camel_type_get_global_classfuncs (camel_object_get_type ());
+	
+	camel_cipher_context_class->sign = cipher_sign;
+	camel_cipher_context_class->clearsign = cipher_clearsign;
+	camel_cipher_context_class->verify = cipher_verify;
+	camel_cipher_context_class->encrypt = cipher_encrypt;
+	camel_cipher_context_class->decrypt = cipher_decrypt;
+}
+
+CamelType
+camel_cipher_context_get_type (void)
+{
+	static CamelType type = CAMEL_INVALID_TYPE;
+	
+	if (type == CAMEL_INVALID_TYPE) {
+		type = camel_type_register (camel_object_get_type (),
+					    "CamelCipherContext",
+					    sizeof (CamelCipherContext),
+					    sizeof (CamelCipherContextClass),
+					    (CamelObjectClassInitFunc) camel_cipher_context_class_init,
+					    NULL,
+					    (CamelObjectInitFunc) camel_cipher_context_init,
+					    (CamelObjectFinalizeFunc) camel_cipher_context_finalise);
+	}
+	
+	return type;
+}
+
+
+/**
+ * camel_cipher_context_new:
+ * @session: CamelSession
+ *
+ * This creates a new CamelCipherContext object which is used to sign,
+ * verify, encrypt and decrypt streams.
+ *
+ * Return value: the new CamelCipherContext
+ **/
+CamelCipherContext *
+camel_cipher_context_new (CamelSession *session)
+{
+	CamelCipherContext *context;
+	
+	g_return_val_if_fail (session != NULL, NULL);
+	
+	context = CAMEL_CIPHER_CONTEXT (camel_object_new (CAMEL_CIPHER_CONTEXT_TYPE));
+	
+	camel_object_ref (CAMEL_OBJECT (session));
+	context->session = session;
+	
+	return context;
+}
+
+
+/**
+ * camel_cipher_context_construct:
+ * @context: CamelCipherContext
+ * @session: CamelSession
+ *
+ * Constucts the CamelCipherContext
+ **/
+void
+camel_cipher_context_construct (CamelCipherContext *context, CamelSession *session)
+{
+	g_return_if_fail (CAMEL_IS_CIPHER_CONTEXT (context));
+	g_return_if_fail (CAMEL_IS_SESSION (session));
+	
+	camel_object_ref (CAMEL_OBJECT (session));
+	context->session = session;
+}
+
+
+static int
+cipher_sign (CamelCipherContext *ctx, const char *userid, CamelCipherHash hash,
+	     CamelStream *istream, CamelStream *ostream, CamelException *ex)
+{
+	camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM,
+			     _("Signing is not supported by this cipher"));
+	return -1;
+}
+
+/**
+ * camel_cipher_sign:
+ * @context: Cipher Context
+ * @userid: private key to use to sign the stream
+ * @hash: preferred Message-Integrity-Check hash algorithm
+ * @istream: input stream
+ * @ostream: output stream
+ * @ex: exception
+ *
+ * Signs the input stream and writes the resulting signature to the output stream.
+ *
+ * Return value: 0 for success or -1 for failure.
+ **/
+int
+camel_cipher_sign (CamelCipherContext *context, const char *userid, CamelCipherHash hash,
+		   CamelStream *istream, CamelStream *ostream, CamelException *ex)
+{
+	int retval;
+	
+	CIPHER_LOCK(context);
+	
+	retval = CCCC (context)->sign (context, userid, hash, istream, ostream, ex);
+	
+	CIPHER_UNLOCK(context);
+	
+	return retval;
+}
+
+
+static int
+cipher_clearsign (CamelCipherContext *context, const char *userid, CamelCipherHash hash,
+		  CamelStream *istream, CamelStream *ostream, CamelException *ex)
+{
+	camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM,
+			     _("Clearsigning is not supported by this cipher"));
+	return -1;
+}
+
+/**
+ * camel_cipher_clearsign:
+ * @context: Cipher Context
+ * @userid: key id or email address of the private key to sign with
+ * @hash: preferred Message-Integrity-Check hash algorithm
+ * @istream: input stream
+ * @ostream: output stream
+ * @ex: exception
+ *
+ * Clearsigns the input stream and writes the resulting clearsign to the output stream.
+ *
+ * Return value: 0 for success or -1 for failure.
+ **/
+int
+camel_cipher_clearsign (CamelCipherContext *context, const char *userid, CamelCipherHash hash,
+			CamelStream *istream, CamelStream *ostream, CamelException *ex)
+{
+	int retval;
+	
+	CIPHER_LOCK(context);
+	
+	retval = CCCC (context)->clearsign (context, userid, hash, istream, ostream, ex);
+	
+	CIPHER_UNLOCK(context);
+	
+	return retval;
+}
+
+
+static CamelCipherValidity *
+cipher_verify (CamelCipherContext *context, CamelStream *istream,
+	       CamelStream *sigstream, CamelException *ex)
+{
+	camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM,
+			     _("Verifying is not supported by this cipher"));
+	return NULL;
+}
+
+/**
+ * camel_cipher_verify:
+ * @context: Cipher Context
+ * @istream: input stream
+ * @sigstream: optional detached-signature stream
+ * @ex: exception
+ *
+ * Verifies the signature. If @istream is a clearsigned stream,
+ * you should pass %NULL as the sigstream parameter. Otherwise
+ * @sigstream is assumed to be the signature stream and is used to
+ * verify the integirity of the @istream.
+ *
+ * Return value: a CamelCipherValidity structure containing information
+ * about the integrity of the input stream or %NULL on failure to
+ * execute at all.
+ **/
+CamelCipherValidity *
+camel_cipher_verify (CamelCipherContext *context, CamelStream *istream,
+		     CamelStream *sigstream, CamelException *ex)
+{
+	CamelCipherValidity *valid;
+	
+	CIPHER_LOCK(context);
+	
+	valid = CCCC (context)->verify (context, istream, sigstream, ex);
+	
+	CIPHER_UNLOCK(context);
+	
+	return valid;
+}
+
+
+static int
+cipher_encrypt (CamelCipherContext *context, gboolean sign, const char *userid, GPtrArray *recipients,
+		CamelStream *istream, CamelStream *ostream, CamelException *ex)
+{
+	camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM,
+			     _("Encryption is not supported by this cipher"));
+	return -1;
+}
+
+/**
+ * camel_cipher_encrypt:
+ * @context: Cipher Context
+ * @sign: sign as well as encrypt
+ * @userid: key id (or email address) to use when signing (assuming @sign is %TRUE)
+ * @recipients: an array of recipient key ids and/or email addresses
+ * @istream: cleartext input stream
+ * @ostream: ciphertext output stream
+ * @ex: exception
+ *
+ * Encrypts (and optionally signs) the cleartext input stream and
+ * writes the resulting ciphertext to the output stream.
+ *
+ * Return value: 0 for success or -1 for failure.
+ **/
+int
+camel_cipher_encrypt (CamelCipherContext *context, gboolean sign, const char *userid, GPtrArray *recipients,
+		      CamelStream *istream, CamelStream *ostream, CamelException *ex)
+{
+	int retval;
+	
+	CIPHER_LOCK(context);
+	
+	retval = CCCC (context)->encrypt (context, sign, userid, recipients, istream, ostream, ex);
+	
+	CIPHER_UNLOCK(context);
+	
+	return retval;
+}
+
+
+static int
+cipher_decrypt (CamelCipherContext *context, CamelStream *istream,
+		CamelStream *ostream, CamelException *ex)
+{
+	camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM,
+			     _("Decryption is not supported by this cipher"));
+	return -1;
+}
+
+/**
+ * camel_cipher_decrypt:
+ * @context: Cipher Context
+ * @ciphertext: ciphertext stream (ie input stream)
+ * @cleartext: cleartext stream (ie output stream)
+ * @ex: exception
+ *
+ * Decrypts the ciphertext input stream and writes the resulting
+ * cleartext to the output stream.
+ *
+ * Return value: 0 for success or -1 for failure.
+ **/
+int
+camel_cipher_decrypt (CamelCipherContext *context, CamelStream *istream,
+		      CamelStream *ostream, CamelException *ex)
+{
+	int retval;
+	
+	CIPHER_LOCK(context);
+	
+	retval = CCCC (context)->decrypt (context, istream, ostream, ex);
+	
+	CIPHER_UNLOCK(context);
+	
+	return retval;
+}
+
+
+/* Cipher Validity stuff */
+struct _CamelCipherValidity {
+	gboolean valid;
+	gchar *description;
+};
+
+CamelCipherValidity *
+camel_cipher_validity_new (void)
+{
+	CamelCipherValidity *validity;
+	
+	validity = g_new (CamelCipherValidity, 1);
+	validity->valid = FALSE;
+	validity->description = NULL;
+	
+	return validity;
+}
+
+void
+camel_cipher_validity_init (CamelCipherValidity *validity)
+{
+	g_assert (validity != NULL);
+	
+	validity->valid = FALSE;
+	validity->description = NULL;
+}
+
+gboolean
+camel_cipher_validity_get_valid (CamelCipherValidity *validity)
+{
+	if (validity == NULL)
+		return FALSE;
+	
+	return validity->valid;
+}
+
+void
+camel_cipher_validity_set_valid (CamelCipherValidity *validity, gboolean valid)
+{
+	g_assert (validity != NULL);
+	
+	validity->valid = valid;
+}
+
+gchar *
+camel_cipher_validity_get_description (CamelCipherValidity *validity)
+{
+	if (validity == NULL)
+		return NULL;
+	
+	return validity->description;
+}
+
+void
+camel_cipher_validity_set_description (CamelCipherValidity *validity, const gchar *description)
+{
+	g_assert (validity != NULL);
+	
+	g_free (validity->description);
+	validity->description = g_strdup (description);
+}
+
+void
+camel_cipher_validity_clear (CamelCipherValidity *validity)
+{
+	g_assert (validity != NULL);
+	
+	validity->valid = FALSE;
+	g_free (validity->description);
+	validity->description = NULL;
+}
+
+void
+camel_cipher_validity_free (CamelCipherValidity *validity)
+{
+	if (validity == NULL)
+		return;
+	
+	g_free (validity->description);
+	g_free (validity);
+}