forked from Mirrors/freeswitch
b3d890ef25
git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@1086 d0543943-73ff-0310-b7d9-9358b9ac24b2
153 lines
4.3 KiB
C
153 lines
4.3 KiB
C
/*
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* null_cipher.c
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*
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* A null cipher implementation. This cipher leaves the plaintext
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* unchanged.
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*
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* David A. McGrew
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* Cisco Systems, Inc.
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*/
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/*
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*
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* Copyright (c) 2001-2005, Cisco Systems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of the Cisco Systems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "datatypes.h"
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#include "null_cipher.h"
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#include "alloc.h"
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/* the null_cipher uses the cipher debug module */
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extern debug_module_t mod_cipher;
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err_status_t
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null_cipher_alloc(cipher_t **c, int key_len) {
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extern cipher_type_t null_cipher;
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uint8_t *pointer;
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debug_print(mod_cipher,
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"allocating cipher with key length %d", key_len);
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/* allocate memory a cipher of type null_cipher */
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pointer = crypto_alloc(sizeof(null_cipher_ctx_t) + sizeof(cipher_t));
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if (pointer == NULL)
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return err_status_alloc_fail;
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/* set pointers */
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*c = (cipher_t *)pointer;
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(*c)->type = &null_cipher;
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(*c)->state = pointer + sizeof(cipher_t);
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/* set key size */
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(*c)->key_len = key_len;
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/* increment ref_count */
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null_cipher.ref_count++;
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return err_status_ok;
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}
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err_status_t
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null_cipher_dealloc(cipher_t *c) {
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extern cipher_type_t null_cipher;
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/* zeroize entire state*/
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octet_string_set_to_zero((uint8_t *)c,
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sizeof(null_cipher_ctx_t) + sizeof(cipher_t));
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/* free memory of type null_cipher */
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crypto_free(c);
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/* decrement reference count */
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null_cipher.ref_count--;
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return err_status_ok;
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}
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err_status_t
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null_cipher_init(null_cipher_ctx_t *ctx, const uint8_t *key) {
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debug_print(mod_cipher, "initializing null cipher", NULL);
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return err_status_ok;
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}
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err_status_t
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null_cipher_set_iv(null_cipher_ctx_t *c, void *iv) {
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return err_status_ok;
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}
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err_status_t
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null_cipher_encrypt(null_cipher_ctx_t *c,
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unsigned char *buf, unsigned int *bytes_to_encr) {
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return err_status_ok;
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}
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char
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null_cipher_description[] = "null cipher";
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cipher_test_case_t
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null_cipher_test_0 = {
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0, /* octets in key */
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NULL, /* key */
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0, /* packet index */
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0, /* octets in plaintext */
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NULL, /* plaintext */
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0, /* octets in plaintext */
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NULL, /* ciphertext */
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NULL /* pointer to next testcase */
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};
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/*
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* note: the decrypt function is idential to the encrypt function
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*/
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cipher_type_t null_cipher = {
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(cipher_alloc_func_t) null_cipher_alloc,
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(cipher_dealloc_func_t) null_cipher_dealloc,
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(cipher_init_func_t) null_cipher_init,
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(cipher_encrypt_func_t) null_cipher_encrypt,
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(cipher_decrypt_func_t) null_cipher_encrypt,
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(cipher_set_iv_func_t) null_cipher_set_iv,
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(char *) null_cipher_description,
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(int) 0,
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(cipher_test_case_t *) &null_cipher_test_0,
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(debug_module_t *) NULL
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};
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