1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/netwerk/srtp/src/crypto/cipher/null_cipher.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,153 @@
1.4 +/*
1.5 + * null_cipher.c
1.6 + *
1.7 + * A null cipher implementation. This cipher leaves the plaintext
1.8 + * unchanged.
1.9 + *
1.10 + * David A. McGrew
1.11 + * Cisco Systems, Inc.
1.12 + */
1.13 +
1.14 +/*
1.15 + *
1.16 + * Copyright (c) 2001-2006, Cisco Systems, Inc.
1.17 + * All rights reserved.
1.18 + *
1.19 + * Redistribution and use in source and binary forms, with or without
1.20 + * modification, are permitted provided that the following conditions
1.21 + * are met:
1.22 + *
1.23 + * Redistributions of source code must retain the above copyright
1.24 + * notice, this list of conditions and the following disclaimer.
1.25 + *
1.26 + * Redistributions in binary form must reproduce the above
1.27 + * copyright notice, this list of conditions and the following
1.28 + * disclaimer in the documentation and/or other materials provided
1.29 + * with the distribution.
1.30 + *
1.31 + * Neither the name of the Cisco Systems, Inc. nor the names of its
1.32 + * contributors may be used to endorse or promote products derived
1.33 + * from this software without specific prior written permission.
1.34 + *
1.35 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
1.36 + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
1.37 + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
1.38 + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
1.39 + * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
1.40 + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
1.41 + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
1.42 + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
1.43 + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
1.44 + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.45 + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
1.46 + * OF THE POSSIBILITY OF SUCH DAMAGE.
1.47 + *
1.48 + */
1.49 +
1.50 +#include "datatypes.h"
1.51 +#include "null_cipher.h"
1.52 +#include "alloc.h"
1.53 +
1.54 +/* the null_cipher uses the cipher debug module */
1.55 +
1.56 +extern debug_module_t mod_cipher;
1.57 +
1.58 +err_status_t
1.59 +null_cipher_alloc(cipher_t **c, int key_len) {
1.60 + extern cipher_type_t null_cipher;
1.61 + uint8_t *pointer;
1.62 +
1.63 + debug_print(mod_cipher,
1.64 + "allocating cipher with key length %d", key_len);
1.65 +
1.66 + /* allocate memory a cipher of type null_cipher */
1.67 + pointer = (uint8_t*)crypto_alloc(sizeof(null_cipher_ctx_t) + sizeof(cipher_t));
1.68 + if (pointer == NULL)
1.69 + return err_status_alloc_fail;
1.70 +
1.71 + /* set pointers */
1.72 + *c = (cipher_t *)pointer;
1.73 + (*c)->type = &null_cipher;
1.74 + (*c)->state = pointer + sizeof(cipher_t);
1.75 +
1.76 + /* set key size */
1.77 + (*c)->key_len = key_len;
1.78 +
1.79 + /* increment ref_count */
1.80 + null_cipher.ref_count++;
1.81 +
1.82 + return err_status_ok;
1.83 +
1.84 +}
1.85 +
1.86 +err_status_t
1.87 +null_cipher_dealloc(cipher_t *c) {
1.88 + extern cipher_type_t null_cipher;
1.89 +
1.90 + /* zeroize entire state*/
1.91 + octet_string_set_to_zero((uint8_t *)c,
1.92 + sizeof(null_cipher_ctx_t) + sizeof(cipher_t));
1.93 +
1.94 + /* free memory of type null_cipher */
1.95 + crypto_free(c);
1.96 +
1.97 + /* decrement reference count */
1.98 + null_cipher.ref_count--;
1.99 +
1.100 + return err_status_ok;
1.101 +
1.102 +}
1.103 +
1.104 +err_status_t
1.105 +null_cipher_init(null_cipher_ctx_t *ctx, const uint8_t *key, int key_len) {
1.106 +
1.107 + debug_print(mod_cipher, "initializing null cipher", NULL);
1.108 +
1.109 + return err_status_ok;
1.110 +}
1.111 +
1.112 +err_status_t
1.113 +null_cipher_set_iv(null_cipher_ctx_t *c, void *iv) {
1.114 + return err_status_ok;
1.115 +}
1.116 +
1.117 +err_status_t
1.118 +null_cipher_encrypt(null_cipher_ctx_t *c,
1.119 + unsigned char *buf, unsigned int *bytes_to_encr) {
1.120 + return err_status_ok;
1.121 +}
1.122 +
1.123 +char
1.124 +null_cipher_description[] = "null cipher";
1.125 +
1.126 +cipher_test_case_t
1.127 +null_cipher_test_0 = {
1.128 + 0, /* octets in key */
1.129 + NULL, /* key */
1.130 + 0, /* packet index */
1.131 + 0, /* octets in plaintext */
1.132 + NULL, /* plaintext */
1.133 + 0, /* octets in plaintext */
1.134 + NULL, /* ciphertext */
1.135 + NULL /* pointer to next testcase */
1.136 +};
1.137 +
1.138 +
1.139 +/*
1.140 + * note: the decrypt function is idential to the encrypt function
1.141 + */
1.142 +
1.143 +cipher_type_t null_cipher = {
1.144 + (cipher_alloc_func_t) null_cipher_alloc,
1.145 + (cipher_dealloc_func_t) null_cipher_dealloc,
1.146 + (cipher_init_func_t) null_cipher_init,
1.147 + (cipher_encrypt_func_t) null_cipher_encrypt,
1.148 + (cipher_decrypt_func_t) null_cipher_encrypt,
1.149 + (cipher_set_iv_func_t) null_cipher_set_iv,
1.150 + (char *) null_cipher_description,
1.151 + (int) 0,
1.152 + (cipher_test_case_t *) &null_cipher_test_0,
1.153 + (debug_module_t *) NULL,
1.154 + (cipher_type_id_t) NULL_CIPHER
1.155 +};
1.156 +
