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comparison: netwerk/srtp/src/crypto/cipher/null_cipher.c
netwerk/srtp/src/crypto/cipher/null_cipher.c
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| -1:000000000000 | 0:03de434bd07d |
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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, 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 #include "datatypes.h" | |
| 48 #include "null_cipher.h" | |
| 49 #include "alloc.h" | |
| 50 | |
| 51 /* the null_cipher uses the cipher debug module */ | |
| 52 | |
| 53 extern debug_module_t mod_cipher; | |
| 54 | |
| 55 err_status_t | |
| 56 null_cipher_alloc(cipher_t **c, int key_len) { | |
| 57 extern cipher_type_t null_cipher; | |
| 58 uint8_t *pointer; | |
| 59 | |
| 60 debug_print(mod_cipher, | |
| 61 "allocating cipher with key length %d", key_len); | |
| 62 | |
| 63 /* allocate memory a cipher of type null_cipher */ | |
| 64 pointer = (uint8_t*)crypto_alloc(sizeof(null_cipher_ctx_t) + sizeof(cipher_t)); | |
| 65 if (pointer == NULL) | |
| 66 return err_status_alloc_fail; | |
| 67 | |
| 68 /* set pointers */ | |
| 69 *c = (cipher_t *)pointer; | |
| 70 (*c)->type = &null_cipher; | |
| 71 (*c)->state = pointer + sizeof(cipher_t); | |
| 72 | |
| 73 /* set key size */ | |
| 74 (*c)->key_len = key_len; | |
| 75 | |
| 76 /* increment ref_count */ | |
| 77 null_cipher.ref_count++; | |
| 78 | |
| 79 return err_status_ok; | |
| 80 | |
| 81 } | |
| 82 | |
| 83 err_status_t | |
| 84 null_cipher_dealloc(cipher_t *c) { | |
| 85 extern cipher_type_t null_cipher; | |
| 86 | |
| 87 /* zeroize entire state*/ | |
| 88 octet_string_set_to_zero((uint8_t *)c, | |
| 89 sizeof(null_cipher_ctx_t) + sizeof(cipher_t)); | |
| 90 | |
| 91 /* free memory of type null_cipher */ | |
| 92 crypto_free(c); | |
| 93 | |
| 94 /* decrement reference count */ | |
| 95 null_cipher.ref_count--; | |
| 96 | |
| 97 return err_status_ok; | |
| 98 | |
| 99 } | |
| 100 | |
| 101 err_status_t | |
| 102 null_cipher_init(null_cipher_ctx_t *ctx, const uint8_t *key, int key_len) { | |
| 103 | |
| 104 debug_print(mod_cipher, "initializing null cipher", NULL); | |
| 105 | |
| 106 return err_status_ok; | |
| 107 } | |
| 108 | |
| 109 err_status_t | |
| 110 null_cipher_set_iv(null_cipher_ctx_t *c, void *iv) { | |
| 111 return err_status_ok; | |
| 112 } | |
| 113 | |
| 114 err_status_t | |
| 115 null_cipher_encrypt(null_cipher_ctx_t *c, | |
| 116 unsigned char *buf, unsigned int *bytes_to_encr) { | |
| 117 return err_status_ok; | |
| 118 } | |
| 119 | |
| 120 char | |
| 121 null_cipher_description[] = "null cipher"; | |
| 122 | |
| 123 cipher_test_case_t | |
| 124 null_cipher_test_0 = { | |
| 125 0, /* octets in key */ | |
| 126 NULL, /* key */ | |
| 127 0, /* packet index */ | |
| 128 0, /* octets in plaintext */ | |
| 129 NULL, /* plaintext */ | |
| 130 0, /* octets in plaintext */ | |
| 131 NULL, /* ciphertext */ | |
| 132 NULL /* pointer to next testcase */ | |
| 133 }; | |
| 134 | |
| 135 | |
| 136 /* | |
| 137 * note: the decrypt function is idential to the encrypt function | |
| 138 */ | |
| 139 | |
| 140 cipher_type_t null_cipher = { | |
| 141 (cipher_alloc_func_t) null_cipher_alloc, | |
| 142 (cipher_dealloc_func_t) null_cipher_dealloc, | |
| 143 (cipher_init_func_t) null_cipher_init, | |
| 144 (cipher_encrypt_func_t) null_cipher_encrypt, | |
| 145 (cipher_decrypt_func_t) null_cipher_encrypt, | |
| 146 (cipher_set_iv_func_t) null_cipher_set_iv, | |
| 147 (char *) null_cipher_description, | |
| 148 (int) 0, | |
| 149 (cipher_test_case_t *) &null_cipher_test_0, | |
| 150 (debug_module_t *) NULL, | |
| 151 (cipher_type_id_t) NULL_CIPHER | |
| 152 }; | |
| 153 |
