1 /* 2 * aes.h 3 * 4 * header file for the AES block cipher 5 * 6 * David A. McGrew 7 * Cisco Systems, Inc. 8 */ 9 10 /* 11 * 12 * Copyright (c) 2001-2006, Cisco Systems, Inc. 13 * All rights reserved. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 19 * Redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer. 21 * 22 * Redistributions in binary form must reproduce the above 23 * copyright notice, this list of conditions and the following 24 * disclaimer in the documentation and/or other materials provided 25 * with the distribution. 26 * 27 * Neither the name of the Cisco Systems, Inc. nor the names of its 28 * contributors may be used to endorse or promote products derived 29 * from this software without specific prior written permission. 30 * 31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 34 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 35 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 36 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 37 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 38 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 41 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 42 * OF THE POSSIBILITY OF SUCH DAMAGE. 43 * 44 */ 45 46 #ifndef _AES_H 47 #define _AES_H 48 49 #include "config.h" 50 51 #include "datatypes.h" 52 #include "gf2_8.h" 53 #include "err.h" 54 55 /* aes internals */ 56 57 typedef struct { 58 v128_t round[15]; 59 int num_rounds; 60 } aes_expanded_key_t; 61 62 err_status_t 63 aes_expand_encryption_key(const uint8_t *key, 64 int key_len, 65 aes_expanded_key_t *expanded_key); 66 67 err_status_t 68 aes_expand_decryption_key(const uint8_t *key, 69 int key_len, 70 aes_expanded_key_t *expanded_key); 71 72 void 73 aes_encrypt(v128_t *plaintext, const aes_expanded_key_t *exp_key); 74 75 void 76 aes_decrypt(v128_t *plaintext, const aes_expanded_key_t *exp_key); 77 78 #if 0 79 /* 80 * internal functions 81 */ 82 83 void 84 aes_init_sbox(void); 85 86 void 87 aes_compute_tables(void); 88 #endif 89 90 #endif /* _AES_H */ 91