1386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari/* 2386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * null_cipher.c 3386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * 4386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * A null cipher implementation. This cipher leaves the plaintext 5386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * unchanged. 6386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * 7386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * David A. McGrew 8386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * Cisco Systems, Inc. 9386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari */ 10386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 11386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari/* 12386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * 13386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * Copyright (c) 2001-2006, Cisco Systems, Inc. 14386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * All rights reserved. 15386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * 16386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * Redistribution and use in source and binary forms, with or without 17386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * modification, are permitted provided that the following conditions 18386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * are met: 19386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * 20386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * Redistributions of source code must retain the above copyright 21386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * notice, this list of conditions and the following disclaimer. 22386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * 23386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * Redistributions in binary form must reproduce the above 24386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * copyright notice, this list of conditions and the following 25386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * disclaimer in the documentation and/or other materials provided 26386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * with the distribution. 27386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * 28386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * Neither the name of the Cisco Systems, Inc. nor the names of its 29386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * contributors may be used to endorse or promote products derived 30386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * from this software without specific prior written permission. 31386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * 32386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 33386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 34386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 35386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 36386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 37386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 38386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 39386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 40386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 41386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 42386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 43386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * OF THE POSSIBILITY OF SUCH DAMAGE. 44386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * 45386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari */ 46386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 47386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari#include "datatypes.h" 48386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari#include "null_cipher.h" 49386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari#include "alloc.h" 50386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 51386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari/* the null_cipher uses the cipher debug module */ 52386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 53386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagariextern debug_module_t mod_cipher; 54386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 55386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagarierr_status_t 56386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagarinull_cipher_alloc(cipher_t **c, int key_len) { 57386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari extern cipher_type_t null_cipher; 58386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari uint8_t *pointer; 59386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 60386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari debug_print(mod_cipher, 61386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari "allocating cipher with key length %d", key_len); 62386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 63386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari /* allocate memory a cipher of type null_cipher */ 64386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari pointer = (uint8_t*)crypto_alloc(sizeof(null_cipher_ctx_t) + sizeof(cipher_t)); 65386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari if (pointer == NULL) 66386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari return err_status_alloc_fail; 67386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 68386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari /* set pointers */ 69386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari *c = (cipher_t *)pointer; 70386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari (*c)->type = &null_cipher; 71386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari (*c)->state = pointer + sizeof(cipher_t); 72386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 73386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari /* set key size */ 74386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari (*c)->key_len = key_len; 75386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 76386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari /* increment ref_count */ 77386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari null_cipher.ref_count++; 78386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 79386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari return err_status_ok; 80386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 81386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari} 82386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 83386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagarierr_status_t 84386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagarinull_cipher_dealloc(cipher_t *c) { 85386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari extern cipher_type_t null_cipher; 86386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 87386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari /* zeroize entire state*/ 88386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari octet_string_set_to_zero((uint8_t *)c, 89386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari sizeof(null_cipher_ctx_t) + sizeof(cipher_t)); 90386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 91386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari /* free memory of type null_cipher */ 92386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari crypto_free(c); 93386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 94386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari /* decrement reference count */ 95386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari null_cipher.ref_count--; 96386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 97386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari return err_status_ok; 98386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 99386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari} 100386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 101386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagarierr_status_t 102386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagarinull_cipher_init(null_cipher_ctx_t *ctx, const uint8_t *key) { 103386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 104386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari debug_print(mod_cipher, "initializing null cipher", NULL); 105386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 106386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari return err_status_ok; 107386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari} 108386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 109386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagarierr_status_t 110386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagarinull_cipher_set_iv(null_cipher_ctx_t *c, void *iv) { 111386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari return err_status_ok; 112386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari} 113386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 114386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagarierr_status_t 115386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagarinull_cipher_encrypt(null_cipher_ctx_t *c, 116386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari unsigned char *buf, unsigned int *bytes_to_encr) { 117386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari return err_status_ok; 118386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari} 119386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 120386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagarichar 121386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagarinull_cipher_description[] = "null cipher"; 122386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 123386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagaricipher_test_case_t 124386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagarinull_cipher_test_0 = { 125386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 0, /* octets in key */ 126386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari NULL, /* key */ 127386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 0, /* packet index */ 128386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 0, /* octets in plaintext */ 129386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari NULL, /* plaintext */ 130386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 0, /* octets in plaintext */ 131386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari NULL, /* ciphertext */ 132386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari NULL /* pointer to next testcase */ 133386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari}; 134386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 135386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 136386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari/* 137386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari * note: the decrypt function is idential to the encrypt function 138386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari */ 139386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 140386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagaricipher_type_t null_cipher = { 141386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari (cipher_alloc_func_t) null_cipher_alloc, 142386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari (cipher_dealloc_func_t) null_cipher_dealloc, 143386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari (cipher_init_func_t) null_cipher_init, 144386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari (cipher_encrypt_func_t) null_cipher_encrypt, 145386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari (cipher_decrypt_func_t) null_cipher_encrypt, 146386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari (cipher_set_iv_func_t) null_cipher_set_iv, 147386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari (char *) null_cipher_description, 148386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari (int) 0, 149386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari (cipher_test_case_t *) &null_cipher_test_0, 150386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari (debug_module_t *) NULL 151386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari}; 152386ce4d9144fc190797f4e43a31aeaf76ca2e373Param Reddappagari 153