/* -*- 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 version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* 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 "camel-cipher-context.h"
#include <glib.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 CCC_CLASS(o) CAMEL_CIPHER_CONTEXT_CLASS(CAMEL_OBJECT_GET_CLASS(o))
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, CamelCipherHash hash,
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 const char *cipher_hash_to_id(CamelCipherContext *context, CamelCipherHash hash);
static CamelCipherHash cipher_id_to_hash(CamelCipherContext *context, const char *id);
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;
camel_cipher_context_class->hash_to_id = cipher_hash_to_id;
camel_cipher_context_class->id_to_hash = cipher_id_to_hash;
}
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;
g_return_val_if_fail (CAMEL_IS_CIPHER_CONTEXT (context), -1);
CIPHER_LOCK(context);
retval = CCC_CLASS (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;
g_return_val_if_fail (CAMEL_IS_CIPHER_CONTEXT (context), -1);
CIPHER_LOCK(context);
retval = CCC_CLASS (context)->clearsign (context, userid, hash, istream, ostream, ex);
CIPHER_UNLOCK(context);
return retval;
}
static CamelCipherValidity *
cipher_verify (CamelCipherContext *context, CamelCipherHash hash, 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, CamelCipherHash hash, CamelStream *istream,
CamelStream *sigstream, CamelException *ex)
{
CamelCipherValidity *valid;
g_return_val_if_fail (CAMEL_IS_CIPHER_CONTEXT (context), NULL);
CIPHER_LOCK(context);
valid = CCC_CLASS (context)->verify (context, hash, 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;
g_return_val_if_fail (CAMEL_IS_CIPHER_CONTEXT (context), -1);
CIPHER_LOCK(context);
retval = CCC_CLASS (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;
g_return_val_if_fail (CAMEL_IS_CIPHER_CONTEXT (context), -1);
CIPHER_LOCK(context);
retval = CCC_CLASS (context)->decrypt (context, istream, ostream, ex);
CIPHER_UNLOCK(context);
return retval;
}
static CamelCipherHash
cipher_id_to_hash(CamelCipherContext *context, const char *id)
{
return CAMEL_CIPHER_HASH_DEFAULT;
}
/* a couple of util functions */
CamelCipherHash
camel_cipher_id_to_hash(CamelCipherContext *context, const char *id)
{
g_return_val_if_fail (CAMEL_IS_CIPHER_CONTEXT (context), CAMEL_CIPHER_HASH_DEFAULT);
return ((CamelCipherContextClass *)((CamelObject *)context)->klass)->id_to_hash(context, id);
}
static const char *
cipher_hash_to_id(CamelCipherContext *context, CamelCipherHash hash)
{
return NULL;
}
const char *
camel_cipher_hash_to_id(CamelCipherContext *context, CamelCipherHash hash)
{
g_return_val_if_fail (CAMEL_IS_CIPHER_CONTEXT (context), NULL);
return ((CamelCipherContextClass *)((CamelObject *)context)->klass)->hash_to_id(context, hash);
}
/* 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);
}
