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Diffstat (limited to 'crypto/cipher/aes_cbc.c')
| -rw-r--r-- | crypto/cipher/aes_cbc.c | 444 |
1 files changed, 0 insertions, 444 deletions
diff --git a/crypto/cipher/aes_cbc.c b/crypto/cipher/aes_cbc.c deleted file mode 100644 index 8fc6a32..0000000 --- a/crypto/cipher/aes_cbc.c +++ /dev/null @@ -1,444 +0,0 @@ -/* - * aes_cbc.c - * - * AES Cipher Block Chaining Mode - * - * David A. McGrew - * Cisco Systems, Inc. - */ - -/* - * - * Copyright (c) 2001-2006, Cisco Systems, Inc. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * - * Redistributions in binary form must reproduce the above - * copyright notice, this list of conditions and the following - * disclaimer in the documentation and/or other materials provided - * with the distribution. - * - * Neither the name of the Cisco Systems, Inc. nor the names of its - * contributors may be used to endorse or promote products derived - * from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS - * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE - * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, - * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES - * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR - * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, - * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) - * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED - * OF THE POSSIBILITY OF SUCH DAMAGE. - * - */ - - -#include "aes_cbc.h" -#include "alloc.h" - -debug_module_t mod_aes_cbc = { - 0, /* debugging is off by default */ - "aes cbc" /* printable module name */ -}; - - - -err_status_t -aes_cbc_alloc(cipher_t **c, int key_len) { - extern cipher_type_t aes_cbc; - uint8_t *pointer; - int tmp; - - debug_print(mod_aes_cbc, - "allocating cipher with key length %d", key_len); - - if (key_len != 16) - return err_status_bad_param; - - /* allocate memory a cipher of type aes_icm */ - tmp = (sizeof(aes_cbc_ctx_t) + sizeof(cipher_t)); - pointer = (uint8_t*)crypto_alloc(tmp); - if (pointer == NULL) - return err_status_alloc_fail; - - /* set pointers */ - *c = (cipher_t *)pointer; - (*c)->type = &aes_cbc; - (*c)->state = pointer + sizeof(cipher_t); - - /* increment ref_count */ - aes_cbc.ref_count++; - - /* set key size */ - (*c)->key_len = key_len; - - return err_status_ok; -} - -err_status_t -aes_cbc_dealloc(cipher_t *c) { - extern cipher_type_t aes_cbc; - - /* zeroize entire state*/ - octet_string_set_to_zero((uint8_t *)c, - sizeof(aes_cbc_ctx_t) + sizeof(cipher_t)); - - /* free memory */ - crypto_free(c); - - /* decrement ref_count */ - aes_cbc.ref_count--; - - return err_status_ok; -} - -err_status_t -aes_cbc_context_init(aes_cbc_ctx_t *c, const uint8_t *key, - cipher_direction_t dir) { - v128_t tmp_key; - - /* set tmp_key (for alignment) */ - v128_copy_octet_string(&tmp_key, key); - - debug_print(mod_aes_cbc, - "key: %s", v128_hex_string(&tmp_key)); - - /* expand key for the appropriate direction */ - switch (dir) { - case (direction_encrypt): - aes_expand_encryption_key(&tmp_key, c->expanded_key); - break; - case (direction_decrypt): - aes_expand_decryption_key(&tmp_key, c->expanded_key); - break; - default: - return err_status_bad_param; - } - - - return err_status_ok; -} - - -err_status_t -aes_cbc_set_iv(aes_cbc_ctx_t *c, void *iv) { - int i; -/* v128_t *input = iv; */ - uint8_t *input = (uint8_t*) iv; - - /* set state and 'previous' block to iv */ - for (i=0; i < 16; i++) - c->previous.v8[i] = c->state.v8[i] = input[i]; - - debug_print(mod_aes_cbc, "setting iv: %s", v128_hex_string(&c->state)); - - return err_status_ok; -} - -err_status_t -aes_cbc_encrypt(aes_cbc_ctx_t *c, - unsigned char *data, - unsigned int *bytes_in_data) { - int i; - unsigned char *input = data; /* pointer to data being read */ - unsigned char *output = data; /* pointer to data being written */ - int bytes_to_encr = *bytes_in_data; - - /* - * verify that we're 16-octet aligned - */ - if (*bytes_in_data & 0xf) - return err_status_bad_param; - - /* - * note that we assume that the initialization vector has already - * been set, e.g. by calling aes_cbc_set_iv() - */ - debug_print(mod_aes_cbc, "iv: %s", - v128_hex_string(&c->state)); - - /* - * loop over plaintext blocks, exoring state into plaintext then - * encrypting and writing to output - */ - while (bytes_to_encr > 0) { - - /* exor plaintext into state */ - for (i=0; i < 16; i++) - c->state.v8[i] ^= *input++; - - debug_print(mod_aes_cbc, "inblock: %s", - v128_hex_string(&c->state)); - - aes_encrypt(&c->state, c->expanded_key); - - debug_print(mod_aes_cbc, "outblock: %s", - v128_hex_string(&c->state)); - - /* copy ciphertext to output */ - for (i=0; i < 16; i++) - *output++ = c->state.v8[i]; - - bytes_to_encr -= 16; - } - - return err_status_ok; -} - -err_status_t -aes_cbc_decrypt(aes_cbc_ctx_t *c, - unsigned char *data, - unsigned int *bytes_in_data) { - int i; - v128_t state, previous; - unsigned char *input = data; /* pointer to data being read */ - unsigned char *output = data; /* pointer to data being written */ - int bytes_to_encr = *bytes_in_data; - uint8_t tmp; - - /* - * verify that we're 16-octet aligned - */ - if (*bytes_in_data & 0x0f) - return err_status_bad_param; - - /* set 'previous' block to iv*/ - for (i=0; i < 16; i++) { - previous.v8[i] = c->previous.v8[i]; - } - - debug_print(mod_aes_cbc, "iv: %s", - v128_hex_string(&previous)); - - /* - * loop over ciphertext blocks, decrypting then exoring with state - * then writing plaintext to output - */ - while (bytes_to_encr > 0) { - - /* set state to ciphertext input block */ - for (i=0; i < 16; i++) { - state.v8[i] = *input++; - } - - debug_print(mod_aes_cbc, "inblock: %s", - v128_hex_string(&state)); - - /* decrypt state */ - aes_decrypt(&state, c->expanded_key); - - debug_print(mod_aes_cbc, "outblock: %s", - v128_hex_string(&state)); - - /* - * exor previous ciphertext block out of plaintext, and write new - * plaintext block to output, while copying old ciphertext block - * to the 'previous' block - */ - for (i=0; i < 16; i++) { - tmp = *output; - *output++ = state.v8[i] ^ previous.v8[i]; - previous.v8[i] = tmp; - } - - bytes_to_encr -= 16; - } - - return err_status_ok; -} - - -err_status_t -aes_cbc_nist_encrypt(aes_cbc_ctx_t *c, - unsigned char *data, - unsigned int *bytes_in_data) { - int i; - unsigned char *pad_start; - int num_pad_bytes; - err_status_t status; - - /* - * determine the number of padding bytes that we need to add - - * this value is always between 1 and 16, inclusive. - */ - num_pad_bytes = 16 - (*bytes_in_data & 0xf); - pad_start = data; - pad_start += *bytes_in_data; - *pad_start++ = 0xa0; - for (i=0; i < num_pad_bytes; i++) - *pad_start++ = 0x00; - - /* - * increment the data size - */ - *bytes_in_data += num_pad_bytes; - - /* - * now cbc encrypt the padded data - */ - status = aes_cbc_encrypt(c, data, bytes_in_data); - if (status) - return status; - - return err_status_ok; -} - - -err_status_t -aes_cbc_nist_decrypt(aes_cbc_ctx_t *c, - unsigned char *data, - unsigned int *bytes_in_data) { - unsigned char *pad_end; - int num_pad_bytes; - err_status_t status; - - /* - * cbc decrypt the padded data - */ - status = aes_cbc_decrypt(c, data, bytes_in_data); - if (status) - return status; - - /* - * determine the number of padding bytes in the decrypted plaintext - * - this value is always between 1 and 16, inclusive. - */ - num_pad_bytes = 1; - pad_end = data + (*bytes_in_data - 1); - while (*pad_end != 0xa0) { /* note: should check padding correctness */ - pad_end--; - num_pad_bytes++; - } - - /* decrement data size */ - *bytes_in_data -= num_pad_bytes; - - return err_status_ok; -} - - -char -aes_cbc_description[] = "aes cipher block chaining (cbc) mode"; - -/* - * Test case 0 is derived from FIPS 197 Appendix A; it uses an - * all-zero IV, so that the first block encryption matches the test - * case in that appendix. This property provides a check of the base - * AES encryption and decryption algorithms; if CBC fails on some - * particular platform, then you should print out AES intermediate - * data and compare with the detailed info provided in that appendix. - * - */ - - -uint8_t aes_cbc_test_case_0_key[16] = { - 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, - 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f -}; - -uint8_t aes_cbc_test_case_0_plaintext[64] = { - 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, - 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff -}; - -uint8_t aes_cbc_test_case_0_ciphertext[80] = { - 0x69, 0xc4, 0xe0, 0xd8, 0x6a, 0x7b, 0x04, 0x30, - 0xd8, 0xcd, 0xb7, 0x80, 0x70, 0xb4, 0xc5, 0x5a, - 0x03, 0x35, 0xed, 0x27, 0x67, 0xf2, 0x6d, 0xf1, - 0x64, 0x83, 0x2e, 0x23, 0x44, 0x38, 0x70, 0x8b - -}; - -uint8_t aes_cbc_test_case_0_iv[16] = { - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 -}; - - -cipher_test_case_t aes_cbc_test_case_0 = { - 16, /* octets in key */ - aes_cbc_test_case_0_key, /* key */ - aes_cbc_test_case_0_iv, /* initialization vector */ - 16, /* octets in plaintext */ - aes_cbc_test_case_0_plaintext, /* plaintext */ - 32, /* octets in ciphertext */ - aes_cbc_test_case_0_ciphertext, /* ciphertext */ - NULL /* pointer to next testcase */ -}; - - -/* - * this test case is taken directly from Appendix F.2 of NIST Special - * Publication SP 800-38A - */ - -uint8_t aes_cbc_test_case_1_key[16] = { - 0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, - 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c, -}; - -uint8_t aes_cbc_test_case_1_plaintext[64] = { - 0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, - 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a, - 0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03, 0xac, 0x9c, - 0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51, - 0x30, 0xc8, 0x1c, 0x46, 0xa3, 0x5c, 0xe4, 0x11, - 0xe5, 0xfb, 0xc1, 0x19, 0x1a, 0x0a, 0x52, 0xef, - 0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17, - 0xad, 0x2b, 0x41, 0x7b, 0xe6, 0x6c, 0x37, 0x10 -}; - -uint8_t aes_cbc_test_case_1_ciphertext[80] = { - 0x76, 0x49, 0xab, 0xac, 0x81, 0x19, 0xb2, 0x46, - 0xce, 0xe9, 0x8e, 0x9b, 0x12, 0xe9, 0x19, 0x7d, - 0x50, 0x86, 0xcb, 0x9b, 0x50, 0x72, 0x19, 0xee, - 0x95, 0xdb, 0x11, 0x3a, 0x91, 0x76, 0x78, 0xb2, - 0x73, 0xbe, 0xd6, 0xb8, 0xe3, 0xc1, 0x74, 0x3b, - 0x71, 0x16, 0xe6, 0x9e, 0x22, 0x22, 0x95, 0x16, - 0x3f, 0xf1, 0xca, 0xa1, 0x68, 0x1f, 0xac, 0x09, - 0x12, 0x0e, 0xca, 0x30, 0x75, 0x86, 0xe1, 0xa7, - 0x39, 0x34, 0x07, 0x03, 0x36, 0xd0, 0x77, 0x99, - 0xe0, 0xc4, 0x2f, 0xdd, 0xa8, 0xdf, 0x4c, 0xa3 -}; - -uint8_t aes_cbc_test_case_1_iv[16] = { - 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, - 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f -}; - -cipher_test_case_t aes_cbc_test_case_1 = { - 16, /* octets in key */ - aes_cbc_test_case_1_key, /* key */ - aes_cbc_test_case_1_iv, /* initialization vector */ - 64, /* octets in plaintext */ - aes_cbc_test_case_1_plaintext, /* plaintext */ - 80, /* octets in ciphertext */ - aes_cbc_test_case_1_ciphertext, /* ciphertext */ - &aes_cbc_test_case_0 /* pointer to next testcase */ -}; - -cipher_type_t aes_cbc = { - (cipher_alloc_func_t) aes_cbc_alloc, - (cipher_dealloc_func_t) aes_cbc_dealloc, - (cipher_init_func_t) aes_cbc_context_init, - (cipher_encrypt_func_t) aes_cbc_nist_encrypt, - (cipher_decrypt_func_t) aes_cbc_nist_decrypt, - (cipher_set_iv_func_t) aes_cbc_set_iv, - (char *) aes_cbc_description, - (int) 0, /* instance count */ - (cipher_test_case_t *) &aes_cbc_test_case_0, - (debug_module_t *) &mod_aes_cbc -}; - - |