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| 1 /* | |
| 2 * null_cipher.c | |
| 3 * | |
| 4 * A null cipher implementation. This cipher leaves the plaintext | |
| 5 * unchanged. | |
| 6 * | |
| 7 * David A. McGrew | |
| 8 * Cisco Systems, Inc. | |
| 9 */ | |
| 10 | |
| 11 /* | |
| 12 * | |
| 13 * Copyright (c) 2001-2006,2013 Cisco Systems, Inc. | |
| 14 * All rights reserved. | |
| 15 * | |
| 16 * Redistribution and use in source and binary forms, with or without | |
| 17 * modification, are permitted provided that the following conditions | |
| 18 * are met: | |
| 19 * | |
| 20 * Redistributions of source code must retain the above copyright | |
| 21 * notice, this list of conditions and the following disclaimer. | |
| 22 * | |
| 23 * Redistributions in binary form must reproduce the above | |
| 24 * copyright notice, this list of conditions and the following | |
| 25 * disclaimer in the documentation and/or other materials provided | |
| 26 * with the distribution. | |
| 27 * | |
| 28 * Neither the name of the Cisco Systems, Inc. nor the names of its | |
| 29 * contributors may be used to endorse or promote products derived | |
| 30 * from this software without specific prior written permission. | |
| 31 * | |
| 32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | |
| 35 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | |
| 36 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, | |
| 37 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
| 38 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
| 39 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 40 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
| 41 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 42 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
| 43 * OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 44 * | |
| 45 */ | |
| 46 | |
| 47 #ifdef HAVE_CONFIG_H | |
| 48 #include <config.h> | |
| 49 #endif | |
| 50 | |
| 51 #include "datatypes.h" | |
| 52 #include "null_cipher.h" | |
| 53 #include "alloc.h" | |
| 54 | |
| 55 /* the null_cipher uses the cipher debug module */ | |
| 56 | |
| 57 extern debug_module_t mod_cipher; | |
| 58 | |
| 59 err_status_t | |
| 60 null_cipher_alloc(cipher_t **c, int key_len, int tlen) { | |
| 61 extern cipher_type_t null_cipher; | |
| 62 uint8_t *pointer; | |
| 63 | |
| 64 debug_print(mod_cipher, | |
| 65 "allocating cipher with key length %d", key_len); | |
| 66 | |
| 67 /* allocate memory a cipher of type null_cipher */ | |
| 68 pointer = (uint8_t*)crypto_alloc(sizeof(null_cipher_ctx_t) + sizeof(cipher_t))
; | |
| 69 if (pointer == NULL) | |
| 70 return err_status_alloc_fail; | |
| 71 | |
| 72 /* set pointers */ | |
| 73 *c = (cipher_t *)pointer; | |
| 74 (*c)->algorithm = NULL_CIPHER; | |
| 75 (*c)->type = &null_cipher; | |
| 76 (*c)->state = pointer + sizeof(cipher_t); | |
| 77 | |
| 78 /* set key size */ | |
| 79 (*c)->key_len = key_len; | |
| 80 | |
| 81 /* increment ref_count */ | |
| 82 null_cipher.ref_count++; | |
| 83 | |
| 84 return err_status_ok; | |
| 85 | |
| 86 } | |
| 87 | |
| 88 err_status_t | |
| 89 null_cipher_dealloc(cipher_t *c) { | |
| 90 extern cipher_type_t null_cipher; | |
| 91 | |
| 92 /* zeroize entire state*/ | |
| 93 octet_string_set_to_zero((uint8_t *)c, | |
| 94 sizeof(null_cipher_ctx_t) + sizeof(cipher_t)); | |
| 95 | |
| 96 /* free memory of type null_cipher */ | |
| 97 crypto_free(c); | |
| 98 | |
| 99 /* decrement reference count */ | |
| 100 null_cipher.ref_count--; | |
| 101 | |
| 102 return err_status_ok; | |
| 103 | |
| 104 } | |
| 105 | |
| 106 err_status_t | |
| 107 null_cipher_init(null_cipher_ctx_t *ctx, const uint8_t *key, int key_len) { | |
| 108 | |
| 109 debug_print(mod_cipher, "initializing null cipher", NULL); | |
| 110 | |
| 111 return err_status_ok; | |
| 112 } | |
| 113 | |
| 114 err_status_t | |
| 115 null_cipher_set_iv(null_cipher_ctx_t *c, void *iv) { | |
| 116 return err_status_ok; | |
| 117 } | |
| 118 | |
| 119 err_status_t | |
| 120 null_cipher_encrypt(null_cipher_ctx_t *c, | |
| 121 unsigned char *buf, unsigned int *bytes_to_encr) { | |
| 122 return err_status_ok; | |
| 123 } | |
| 124 | |
| 125 char | |
| 126 null_cipher_description[] = "null cipher"; | |
| 127 | |
| 128 cipher_test_case_t | |
| 129 null_cipher_test_0 = { | |
| 130 0, /* octets in key */ | |
| 131 NULL, /* key */ | |
| 132 0, /* packet index */ | |
| 133 0, /* octets in plaintext */ | |
| 134 NULL, /* plaintext */ | |
| 135 0, /* octets in plaintext */ | |
| 136 NULL, /* ciphertext */ | |
| 137 0, | |
| 138 NULL, | |
| 139 0, | |
| 140 NULL /* pointer to next testcase */ | |
| 141 }; | |
| 142 | |
| 143 | |
| 144 /* | |
| 145 * note: the decrypt function is idential to the encrypt function | |
| 146 */ | |
| 147 | |
| 148 cipher_type_t null_cipher = { | |
| 149 (cipher_alloc_func_t) null_cipher_alloc, | |
| 150 (cipher_dealloc_func_t) null_cipher_dealloc, | |
| 151 (cipher_init_func_t) null_cipher_init, | |
| 152 (cipher_set_aad_func_t) 0, | |
| 153 (cipher_encrypt_func_t) null_cipher_encrypt, | |
| 154 (cipher_decrypt_func_t) null_cipher_encrypt, | |
| 155 (cipher_set_iv_func_t) null_cipher_set_iv, | |
| 156 (cipher_get_tag_func_t) 0, | |
| 157 (char *) null_cipher_description, | |
| 158 (int) 0, | |
| 159 (cipher_test_case_t *) &null_cipher_test_0, | |
| 160 (debug_module_t *) NULL, | |
| 161 (cipher_type_id_t) NULL_CIPHER | |
| 162 }; | |
| 163 | |
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Chromium Code Reviews
Issue 2344973002:
Update libsrtp to version 2.0 (Closed)
