silccipher.c
- Author: Pekka Riikonen <priikone@poseidon.pspt.fi>
+ Author: Pekka Riikonen <priikone@silcnet.org>
- Copyright (C) 1997 - 2001 Pekka Riikonen
+ Copyright (C) 1997 - 2005 Pekka Riikonen
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.
-
+ the Free Software Foundation; version 2 of the License.
+
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
*/
/* $Id$ */
-#include "silcincludes.h"
+#include "silc.h"
#include "ciphers.h" /* Includes cipher definitions */
+/* The SilcCipher context */
+struct SilcCipherStruct {
+ SilcCipherObject *cipher;
+ void *context;
+ unsigned char iv[SILC_CIPHER_MAX_IV_SIZE];
+};
+
#ifndef SILC_EPOC
/* Dynamically registered list of ciphers. */
SilcDList silc_cipher_list = NULL;
/* Static list of ciphers for silc_cipher_register_default(). */
const SilcCipherObject silc_default_ciphers[] =
{
- { "aes-256-cbc", 16, 256, silc_aes_set_key,
+ { "aes-256-cbc", 16, 256, silc_aes_set_key,
silc_aes_set_key_with_string, silc_aes_encrypt_cbc,
silc_aes_decrypt_cbc, silc_aes_context_len },
- { "aes-192-cbc", 16, 192, silc_aes_set_key,
+ { "aes-192-cbc", 16, 192, silc_aes_set_key,
silc_aes_set_key_with_string, silc_aes_encrypt_cbc,
silc_aes_decrypt_cbc, silc_aes_context_len },
- { "aes-128-cbc", 16, 128, silc_aes_set_key,
+ { "aes-128-cbc", 16, 128, silc_aes_set_key,
silc_aes_set_key_with_string, silc_aes_encrypt_cbc,
silc_aes_decrypt_cbc, silc_aes_context_len },
- { "twofish-256-cbc", 16, 256, silc_twofish_set_key,
+ { "twofish-256-cbc", 16, 256, silc_twofish_set_key,
silc_twofish_set_key_with_string,
- silc_twofish_encrypt_cbc, silc_twofish_decrypt_cbc,
+ silc_twofish_encrypt_cbc, silc_twofish_decrypt_cbc,
silc_twofish_context_len },
- { "twofish-192-cbc", 16, 192, silc_twofish_set_key,
+ { "twofish-192-cbc", 16, 192, silc_twofish_set_key,
silc_twofish_set_key_with_string,
- silc_twofish_encrypt_cbc, silc_twofish_decrypt_cbc,
+ silc_twofish_encrypt_cbc, silc_twofish_decrypt_cbc,
silc_twofish_context_len },
- { "twofish-128-cbc", 16, 128, silc_twofish_set_key,
+ { "twofish-128-cbc", 16, 128, silc_twofish_set_key,
silc_twofish_set_key_with_string,
- silc_twofish_encrypt_cbc, silc_twofish_decrypt_cbc,
+ silc_twofish_encrypt_cbc, silc_twofish_decrypt_cbc,
silc_twofish_context_len },
- { "rc6-256-cbc", 16, 256, silc_rc6_set_key, silc_rc6_set_key_with_string,
- silc_rc6_encrypt_cbc, silc_rc6_decrypt_cbc,
- silc_rc6_context_len },
- { "rc6-192-cbc", 16, 192, silc_rc6_set_key, silc_rc6_set_key_with_string,
- silc_rc6_encrypt_cbc, silc_rc6_decrypt_cbc,
- silc_rc6_context_len },
- { "rc6-128-cbc", 16, 128, silc_rc6_set_key, silc_rc6_set_key_with_string,
- silc_rc6_encrypt_cbc, silc_rc6_decrypt_cbc,
- silc_rc6_context_len },
- { "mars-256-cbc", 16, 256, silc_mars_set_key, silc_mars_set_key_with_string,
- silc_mars_encrypt_cbc, silc_mars_decrypt_cbc,
- silc_mars_context_len },
- { "mars-192-cbc", 16, 192, silc_mars_set_key, silc_mars_set_key_with_string,
- silc_mars_encrypt_cbc, silc_mars_decrypt_cbc,
- silc_mars_context_len },
- { "mars-128-cbc", 16, 128, silc_mars_set_key, silc_mars_set_key_with_string,
- silc_mars_encrypt_cbc, silc_mars_decrypt_cbc,
- silc_mars_context_len },
{ "cast-256-cbc", 16, 256, silc_cast_set_key, silc_cast_set_key_with_string,
- silc_cast_encrypt_cbc, silc_cast_decrypt_cbc,
+ silc_cast_encrypt_cbc, silc_cast_decrypt_cbc,
silc_cast_context_len },
{ "cast-192-cbc", 16, 192, silc_cast_set_key, silc_cast_set_key_with_string,
- silc_cast_encrypt_cbc, silc_cast_decrypt_cbc,
+ silc_cast_encrypt_cbc, silc_cast_decrypt_cbc,
silc_cast_context_len },
{ "cast-128-cbc", 16, 128, silc_cast_set_key, silc_cast_set_key_with_string,
- silc_cast_encrypt_cbc, silc_cast_decrypt_cbc,
+ silc_cast_encrypt_cbc, silc_cast_decrypt_cbc,
silc_cast_context_len },
+#ifdef SILC_DEBUG
{ "none", 0, 0, silc_none_set_key, silc_none_set_key_with_string,
- silc_none_encrypt_cbc, silc_none_decrypt_cbc,
+ silc_none_encrypt_cbc, silc_none_decrypt_cbc,
silc_none_context_len },
+#endif /* SILC_DEBUG */
{ NULL, 0, 0, NULL, NULL, NULL, NULL, NULL }
};
registered. Therefore, if memory has been allocated for the object sent
as argument it has to be free'd after this function returns succesfully. */
-bool silc_cipher_register(const SilcCipherObject *cipher)
+SilcBool silc_cipher_register(const SilcCipherObject *cipher)
{
#ifndef SILC_EPOC
SilcCipherObject *new;
/* Unregister a cipher from the SILC. */
-bool silc_cipher_unregister(SilcCipherObject *cipher)
+SilcBool silc_cipher_unregister(SilcCipherObject *cipher)
{
#ifndef SILC_EPOC
SilcCipherObject *entry;
return FALSE;
}
-/* Function that registers all the default ciphers (all builtin ciphers).
+/* Function that registers all the default ciphers (all builtin ciphers).
The application may use this to register the default ciphers if specific
ciphers in any specific order is not wanted. */
-bool silc_cipher_register_default(void)
+SilcBool silc_cipher_register_default(void)
{
#ifndef SILC_EPOC
int i;
return TRUE;
}
-bool silc_cipher_unregister_all(void)
+SilcBool silc_cipher_unregister_all(void)
{
#ifndef SILC_EPOC
SilcCipherObject *entry;
return TRUE;
}
-/* Allocates a new SILC cipher object. Function returns 1 on succes and 0
+/* Allocates a new SILC cipher object. Function returns 1 on succes and 0
on error. The allocated cipher is returned in new_cipher argument. The
caller must set the key to the cipher after this function has returned
by calling the ciphers set_key function. */
-bool silc_cipher_alloc(const unsigned char *name, SilcCipher *new_cipher)
+SilcBool silc_cipher_alloc(const unsigned char *name, SilcCipher *new_cipher)
{
SilcCipherObject *entry = NULL;
SILC_LOG_DEBUG(("Allocating new cipher object"));
-
+
#ifndef SILC_EPOC
if (silc_cipher_list) {
silc_dlist_start(silc_cipher_list);
if (entry) {
*new_cipher = silc_calloc(1, sizeof(**new_cipher));
- (*new_cipher)->cipher = entry;
+ (*new_cipher)->cipher = entry;
(*new_cipher)->context = silc_calloc(1, entry->context_len());
- (*new_cipher)->set_iv = silc_cipher_set_iv;
- (*new_cipher)->get_iv = silc_cipher_get_iv;
- (*new_cipher)->get_key_len = silc_cipher_get_key_len;
- (*new_cipher)->get_block_len = silc_cipher_get_block_len;
return TRUE;
}
/* Returns TRUE if cipher `name' is supported. */
-bool silc_cipher_is_supported(const unsigned char *name)
+SilcBool silc_cipher_is_supported(const unsigned char *name)
{
#ifndef SILC_EPOC
SilcCipherObject *entry;
while ((entry = silc_dlist_get(silc_cipher_list)) != SILC_LIST_END) {
len += strlen(entry->name);
list = silc_realloc(list, len + 1);
-
- memcpy(list + (len - strlen(entry->name)),
+
+ memcpy(list + (len - strlen(entry->name)),
entry->name, strlen(entry->name));
memcpy(list + len, ",", 1);
len++;
entry = (SilcCipherObject *)&(silc_default_ciphers[i]);
len += strlen(entry->name);
list = silc_realloc(list, len + 1);
-
- memcpy(list + (len - strlen(entry->name)),
+
+ memcpy(list + (len - strlen(entry->name)),
entry->name, strlen(entry->name));
memcpy(list + len, ",", 1);
len++;
/* Encrypts */
-bool silc_cipher_encrypt(SilcCipher cipher, const unsigned char *src,
- unsigned char *dst, SilcUInt32 len,
+SilcBool silc_cipher_encrypt(SilcCipher cipher, const unsigned char *src,
+ unsigned char *dst, SilcUInt32 len,
unsigned char *iv)
{
- return cipher->cipher->encrypt(cipher->context, src, dst, len, iv);
+#ifdef SILC_DEBUG
+ assert((len & (cipher->cipher->block_len - 1)) == 0);
+#endif
+ if (len & (cipher->cipher->block_len - 1))
+ return FALSE;
+ return cipher->cipher->encrypt(cipher->context, src, dst, len,
+ iv ? iv : cipher->iv);
}
/* Decrypts */
-bool silc_cipher_decrypt(SilcCipher cipher, const unsigned char *src,
- unsigned char *dst, SilcUInt32 len,
+SilcBool silc_cipher_decrypt(SilcCipher cipher, const unsigned char *src,
+ unsigned char *dst, SilcUInt32 len,
unsigned char *iv)
{
- return cipher->cipher->decrypt(cipher->context, src, dst, len, iv);
+#ifdef SILC_DEBUG
+ /* assert((len & (cipher->cipher->block_len - 1)) == 0); */
+#endif
+ if (len & (cipher->cipher->block_len - 1))
+ return FALSE;
+ return cipher->cipher->decrypt(cipher->context, src, dst, len,
+ iv ? iv : cipher->iv);
}
/* Sets the key for the cipher */
-bool silc_cipher_set_key(SilcCipher cipher, const unsigned char *key,
+SilcBool silc_cipher_set_key(SilcCipher cipher, const unsigned char *key,
SilcUInt32 keylen)
{
return cipher->cipher->set_key(cipher->context, key, keylen);
memcpy(&cipher->iv, iv, cipher->cipher->block_len);
}
-/* Returns the IV (initial vector) of the cipher. The IV is returned
- to 'iv' argument. */
+/* Returns the IV (initial vector) of the cipher. */
-void silc_cipher_get_iv(SilcCipher cipher, unsigned char *iv)
+unsigned char *silc_cipher_get_iv(SilcCipher cipher)
{
- memcpy(iv, &cipher->iv, cipher->cipher->block_len);
+ return cipher->iv;
}
/* Returns the key length of the cipher. */
{
return cipher->cipher->block_len;
}
+
+/* Returns the name of the cipher */
+
+const char *silc_cipher_get_name(SilcCipher cipher)
+{
+ return (const char *)cipher->cipher->name;
+}
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