1/* 2 * Copyright (c) 2003 Kungliga Tekniska H��gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#include "config.h" 35 36 37#ifdef KRB5 38#include <krb5-types.h> 39#endif 40 41#include <string.h> 42 43#include "rijndael-alg-fst.h" 44#include "aes.h" 45 46int 47AES_set_encrypt_key(const unsigned char *userkey, const int bits, AES_KEY *key) 48{ 49 key->rounds = rijndaelKeySetupEnc(key->key, userkey, bits); 50 if (key->rounds == 0) 51 return -1; 52 return 0; 53} 54 55int 56AES_set_decrypt_key(const unsigned char *userkey, const int bits, AES_KEY *key) 57{ 58 key->rounds = rijndaelKeySetupDec(key->key, userkey, bits); 59 if (key->rounds == 0) 60 return -1; 61 return 0; 62} 63 64void 65AES_encrypt(const unsigned char *in, unsigned char *out, const AES_KEY *key) 66{ 67 rijndaelEncrypt(key->key, key->rounds, in, out); 68} 69 70void 71AES_decrypt(const unsigned char *in, unsigned char *out, const AES_KEY *key) 72{ 73 rijndaelDecrypt(key->key, key->rounds, in, out); 74} 75 76void 77AES_cbc_encrypt(const unsigned char *in, unsigned char *out, 78 unsigned long size, const AES_KEY *key, 79 unsigned char *iv, int forward_encrypt) 80{ 81 unsigned char tmp[AES_BLOCK_SIZE]; 82 int i; 83 84 if (forward_encrypt) { 85 while (size >= AES_BLOCK_SIZE) { 86 for (i = 0; i < AES_BLOCK_SIZE; i++) 87 tmp[i] = in[i] ^ iv[i]; 88 AES_encrypt(tmp, out, key); 89 memcpy(iv, out, AES_BLOCK_SIZE); 90 size -= AES_BLOCK_SIZE; 91 in += AES_BLOCK_SIZE; 92 out += AES_BLOCK_SIZE; 93 } 94 if (size) { 95 for (i = 0; i < size; i++) 96 tmp[i] = in[i] ^ iv[i]; 97 for (i = size; i < AES_BLOCK_SIZE; i++) 98 tmp[i] = iv[i]; 99 AES_encrypt(tmp, out, key); 100 memcpy(iv, out, AES_BLOCK_SIZE); 101 } 102 } else { 103 while (size >= AES_BLOCK_SIZE) { 104 memcpy(tmp, in, AES_BLOCK_SIZE); 105 AES_decrypt(tmp, out, key); 106 for (i = 0; i < AES_BLOCK_SIZE; i++) 107 out[i] ^= iv[i]; 108 memcpy(iv, tmp, AES_BLOCK_SIZE); 109 size -= AES_BLOCK_SIZE; 110 in += AES_BLOCK_SIZE; 111 out += AES_BLOCK_SIZE; 112 } 113 if (size) { 114 memcpy(tmp, in, AES_BLOCK_SIZE); 115 AES_decrypt(tmp, out, key); 116 for (i = 0; i < size; i++) 117 out[i] ^= iv[i]; 118 memcpy(iv, tmp, AES_BLOCK_SIZE); 119 } 120 } 121} 122