netwerk/srtp/src/crypto/cipher/null_cipher.c@6474c204b198 (annotated)
netwerk/srtp/src/crypto/cipher/null_cipher.c
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* |
| michael@0 | 2 | * null_cipher.c |
| michael@0 | 3 | * |
| michael@0 | 4 | * A null cipher implementation. This cipher leaves the plaintext |
| michael@0 | 5 | * unchanged. |
| michael@0 | 6 | * |
| michael@0 | 7 | * David A. McGrew |
| michael@0 | 8 | * Cisco Systems, Inc. |
| michael@0 | 9 | */ |
| michael@0 | 10 | |
| michael@0 | 11 | /* |
| michael@0 | 12 | * |
| michael@0 | 13 | * Copyright (c) 2001-2006, Cisco Systems, Inc. |
| michael@0 | 14 | * All rights reserved. |
| michael@0 | 15 | * |
| michael@0 | 16 | * Redistribution and use in source and binary forms, with or without |
| michael@0 | 17 | * modification, are permitted provided that the following conditions |
| michael@0 | 18 | * are met: |
| michael@0 | 19 | * |
| michael@0 | 20 | * Redistributions of source code must retain the above copyright |
| michael@0 | 21 | * notice, this list of conditions and the following disclaimer. |
| michael@0 | 22 | * |
| michael@0 | 23 | * Redistributions in binary form must reproduce the above |
| michael@0 | 24 | * copyright notice, this list of conditions and the following |
| michael@0 | 25 | * disclaimer in the documentation and/or other materials provided |
| michael@0 | 26 | * with the distribution. |
| michael@0 | 27 | * |
| michael@0 | 28 | * Neither the name of the Cisco Systems, Inc. nor the names of its |
| michael@0 | 29 | * contributors may be used to endorse or promote products derived |
| michael@0 | 30 | * from this software without specific prior written permission. |
| michael@0 | 31 | * |
| michael@0 | 32 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| michael@0 | 33 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| michael@0 | 34 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| michael@0 | 35 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| michael@0 | 36 | * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
| michael@0 | 37 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| michael@0 | 38 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| michael@0 | 39 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| michael@0 | 40 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| michael@0 | 41 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| michael@0 | 42 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| michael@0 | 43 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
| michael@0 | 44 | * |
| michael@0 | 45 | */ |
| michael@0 | 46 | |
| michael@0 | 47 | #include "datatypes.h" |
| michael@0 | 48 | #include "null_cipher.h" |
| michael@0 | 49 | #include "alloc.h" |
| michael@0 | 50 | |
| michael@0 | 51 | /* the null_cipher uses the cipher debug module */ |
| michael@0 | 52 | |
| michael@0 | 53 | extern debug_module_t mod_cipher; |
| michael@0 | 54 | |
| michael@0 | 55 | err_status_t |
| michael@0 | 56 | null_cipher_alloc(cipher_t **c, int key_len) { |
| michael@0 | 57 | extern cipher_type_t null_cipher; |
| michael@0 | 58 | uint8_t *pointer; |
| michael@0 | 59 | |
| michael@0 | 60 | debug_print(mod_cipher, |
| michael@0 | 61 | "allocating cipher with key length %d", key_len); |
| michael@0 | 62 | |
| michael@0 | 63 | /* allocate memory a cipher of type null_cipher */ |
| michael@0 | 64 | pointer = (uint8_t*)crypto_alloc(sizeof(null_cipher_ctx_t) + sizeof(cipher_t)); |
| michael@0 | 65 | if (pointer == NULL) |
| michael@0 | 66 | return err_status_alloc_fail; |
| michael@0 | 67 | |
| michael@0 | 68 | /* set pointers */ |
| michael@0 | 69 | *c = (cipher_t *)pointer; |
| michael@0 | 70 | (*c)->type = &null_cipher; |
| michael@0 | 71 | (*c)->state = pointer + sizeof(cipher_t); |
| michael@0 | 72 | |
| michael@0 | 73 | /* set key size */ |
| michael@0 | 74 | (*c)->key_len = key_len; |
| michael@0 | 75 | |
| michael@0 | 76 | /* increment ref_count */ |
| michael@0 | 77 | null_cipher.ref_count++; |
| michael@0 | 78 | |
| michael@0 | 79 | return err_status_ok; |
| michael@0 | 80 | |
| michael@0 | 81 | } |
| michael@0 | 82 | |
| michael@0 | 83 | err_status_t |
| michael@0 | 84 | null_cipher_dealloc(cipher_t *c) { |
| michael@0 | 85 | extern cipher_type_t null_cipher; |
| michael@0 | 86 | |
| michael@0 | 87 | /* zeroize entire state*/ |
| michael@0 | 88 | octet_string_set_to_zero((uint8_t *)c, |
| michael@0 | 89 | sizeof(null_cipher_ctx_t) + sizeof(cipher_t)); |
| michael@0 | 90 | |
| michael@0 | 91 | /* free memory of type null_cipher */ |
| michael@0 | 92 | crypto_free(c); |
| michael@0 | 93 | |
| michael@0 | 94 | /* decrement reference count */ |
| michael@0 | 95 | null_cipher.ref_count--; |
| michael@0 | 96 | |
| michael@0 | 97 | return err_status_ok; |
| michael@0 | 98 | |
| michael@0 | 99 | } |
| michael@0 | 100 | |
| michael@0 | 101 | err_status_t |
| michael@0 | 102 | null_cipher_init(null_cipher_ctx_t *ctx, const uint8_t *key, int key_len) { |
| michael@0 | 103 | |
| michael@0 | 104 | debug_print(mod_cipher, "initializing null cipher", NULL); |
| michael@0 | 105 | |
| michael@0 | 106 | return err_status_ok; |
| michael@0 | 107 | } |
| michael@0 | 108 | |
| michael@0 | 109 | err_status_t |
| michael@0 | 110 | null_cipher_set_iv(null_cipher_ctx_t *c, void *iv) { |
| michael@0 | 111 | return err_status_ok; |
| michael@0 | 112 | } |
| michael@0 | 113 | |
| michael@0 | 114 | err_status_t |
| michael@0 | 115 | null_cipher_encrypt(null_cipher_ctx_t *c, |
| michael@0 | 116 | unsigned char *buf, unsigned int *bytes_to_encr) { |
| michael@0 | 117 | return err_status_ok; |
| michael@0 | 118 | } |
| michael@0 | 119 | |
| michael@0 | 120 | char |
| michael@0 | 121 | null_cipher_description[] = "null cipher"; |
| michael@0 | 122 | |
| michael@0 | 123 | cipher_test_case_t |
| michael@0 | 124 | null_cipher_test_0 = { |
| michael@0 | 125 | 0, /* octets in key */ |
| michael@0 | 126 | NULL, /* key */ |
| michael@0 | 127 | 0, /* packet index */ |
| michael@0 | 128 | 0, /* octets in plaintext */ |
| michael@0 | 129 | NULL, /* plaintext */ |
| michael@0 | 130 | 0, /* octets in plaintext */ |
| michael@0 | 131 | NULL, /* ciphertext */ |
| michael@0 | 132 | NULL /* pointer to next testcase */ |
| michael@0 | 133 | }; |
| michael@0 | 134 | |
| michael@0 | 135 | |
| michael@0 | 136 | /* |
| michael@0 | 137 | * note: the decrypt function is idential to the encrypt function |
| michael@0 | 138 | */ |
| michael@0 | 139 | |
| michael@0 | 140 | cipher_type_t null_cipher = { |
| michael@0 | 141 | (cipher_alloc_func_t) null_cipher_alloc, |
| michael@0 | 142 | (cipher_dealloc_func_t) null_cipher_dealloc, |
| michael@0 | 143 | (cipher_init_func_t) null_cipher_init, |
| michael@0 | 144 | (cipher_encrypt_func_t) null_cipher_encrypt, |
| michael@0 | 145 | (cipher_decrypt_func_t) null_cipher_encrypt, |
| michael@0 | 146 | (cipher_set_iv_func_t) null_cipher_set_iv, |
| michael@0 | 147 | (char *) null_cipher_description, |
| michael@0 | 148 | (int) 0, |
| michael@0 | 149 | (cipher_test_case_t *) &null_cipher_test_0, |
| michael@0 | 150 | (debug_module_t *) NULL, |
| michael@0 | 151 | (cipher_type_id_t) NULL_CIPHER |
| michael@0 | 152 | }; |
| michael@0 | 153 |
