1/* crypto/aes/aes_cbc.c -*- mode:C; c-file-style: "eay" -*- */ 2/* ==================================================================== 3 * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the 15 * distribution. 16 * 17 * 3. All advertising materials mentioning features or use of this 18 * software must display the following acknowledgment: 19 * "This product includes software developed by the OpenSSL Project 20 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 21 * 22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 23 * endorse or promote products derived from this software without 24 * prior written permission. For written permission, please contact 25 * openssl-core@openssl.org. 26 * 27 * 5. Products derived from this software may not be called "OpenSSL" 28 * nor may "OpenSSL" appear in their names without prior written 29 * permission of the OpenSSL Project. 30 * 31 * 6. Redistributions of any form whatsoever must retain the following 32 * acknowledgment: 33 * "This product includes software developed by the OpenSSL Project 34 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 35 * 36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 39 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 47 * OF THE POSSIBILITY OF SUCH DAMAGE. 48 * ==================================================================== 49 * 50 */ 51 52#ifndef AES_DEBUG 53# ifndef NDEBUG 54# define NDEBUG 55# endif 56#endif 57#include <assert.h> 58 59#include <openssl/aes.h> 60#include "aes_locl.h" 61 62#if !defined(OPENSSL_FIPS_AES_ASM) 63void AES_cbc_encrypt(const unsigned char *in, unsigned char *out, 64 const unsigned long length, const AES_KEY *key, 65 unsigned char *ivec, const int enc) { 66 67 unsigned long n; 68 unsigned long len = length; 69 unsigned char tmp[AES_BLOCK_SIZE]; 70 const unsigned char *iv = ivec; 71 72 assert(in && out && key && ivec); 73 assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc)); 74 75 if (AES_ENCRYPT == enc) { 76 while (len >= AES_BLOCK_SIZE) { 77 for(n=0; n < AES_BLOCK_SIZE; ++n) 78 out[n] = in[n] ^ iv[n]; 79 AES_encrypt(out, out, key); 80 iv = out; 81 len -= AES_BLOCK_SIZE; 82 in += AES_BLOCK_SIZE; 83 out += AES_BLOCK_SIZE; 84 } 85 if (len) { 86 for(n=0; n < len; ++n) 87 out[n] = in[n] ^ iv[n]; 88 for(n=len; n < AES_BLOCK_SIZE; ++n) 89 out[n] = iv[n]; 90 AES_encrypt(out, out, key); 91 iv = out; 92 } 93 memcpy(ivec,iv,AES_BLOCK_SIZE); 94 } else if (in != out) { 95 while (len >= AES_BLOCK_SIZE) { 96 AES_decrypt(in, out, key); 97 for(n=0; n < AES_BLOCK_SIZE; ++n) 98 out[n] ^= iv[n]; 99 iv = in; 100 len -= AES_BLOCK_SIZE; 101 in += AES_BLOCK_SIZE; 102 out += AES_BLOCK_SIZE; 103 } 104 if (len) { 105 AES_decrypt(in,tmp,key); 106 for(n=0; n < len; ++n) 107 out[n] = tmp[n] ^ iv[n]; 108 iv = in; 109 } 110 memcpy(ivec,iv,AES_BLOCK_SIZE); 111 } else { 112 while (len >= AES_BLOCK_SIZE) { 113 memcpy(tmp, in, AES_BLOCK_SIZE); 114 AES_decrypt(in, out, key); 115 for(n=0; n < AES_BLOCK_SIZE; ++n) 116 out[n] ^= ivec[n]; 117 memcpy(ivec, tmp, AES_BLOCK_SIZE); 118 len -= AES_BLOCK_SIZE; 119 in += AES_BLOCK_SIZE; 120 out += AES_BLOCK_SIZE; 121 } 122 if (len) { 123 memcpy(tmp, in, AES_BLOCK_SIZE); 124 AES_decrypt(tmp, out, key); 125 for(n=0; n < len; ++n) 126 out[n] ^= ivec[n]; 127 for(n=len; n < AES_BLOCK_SIZE; ++n) 128 out[n] = tmp[n]; 129 memcpy(ivec, tmp, AES_BLOCK_SIZE); 130 } 131 } 132} 133#endif 134