1 /* ==================================================================== 2 * Copyright (c) 2008 The OpenSSL Project. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in 13 * the documentation and/or other materials provided with the 14 * distribution. 15 * 16 * 3. All advertising materials mentioning features or use of this 17 * software must display the following acknowledgment: 18 * "This product includes software developed by the OpenSSL Project 19 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 20 * 21 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 22 * endorse or promote products derived from this software without 23 * prior written permission. For written permission, please contact 24 * openssl-core (at) openssl.org. 25 * 26 * 5. Products derived from this software may not be called "OpenSSL" 27 * nor may "OpenSSL" appear in their names without prior written 28 * permission of the OpenSSL Project. 29 * 30 * 6. Redistributions of any form whatsoever must retain the following 31 * acknowledgment: 32 * "This product includes software developed by the OpenSSL Project 33 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 34 * 35 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 36 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 37 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 38 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 41 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 42 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 44 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 45 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 46 * OF THE POSSIBILITY OF SUCH DAMAGE. 47 * ==================================================================== 48 * 49 */ 50 51 #include <openssl/crypto.h> 52 #include "modes_lcl.h" 53 #include <string.h> 54 55 #ifndef MODES_DEBUG 56 # ifndef NDEBUG 57 # define NDEBUG 58 # endif 59 #endif 60 #include <assert.h> 61 62 #ifndef STRICT_ALIGNMENT 63 # define STRICT_ALIGNMENT 0 64 #endif 65 66 void CRYPTO_cbc128_encrypt(const unsigned char *in, unsigned char *out, 67 size_t len, const void *key, 68 unsigned char ivec[16], block128_f block) 69 { 70 size_t n; 71 const unsigned char *iv = ivec; 72 73 assert(in && out && key && ivec); 74 75 #if !defined(OPENSSL_SMALL_FOOTPRINT) 76 if (STRICT_ALIGNMENT && 77 ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) { 78 while (len>=16) { 79 for(n=0; n<16; ++n) 80 out[n] = in[n] ^ iv[n]; 81 (*block)(out, out, key); 82 iv = out; 83 len -= 16; 84 in += 16; 85 out += 16; 86 } 87 } else { 88 while (len>=16) { 89 for(n=0; n<16; n+=sizeof(size_t)) 90 *(size_t*)(out+n) = 91 *(size_t*)(in+n) ^ *(size_t*)(iv+n); 92 (*block)(out, out, key); 93 iv = out; 94 len -= 16; 95 in += 16; 96 out += 16; 97 } 98 } 99 #endif 100 while (len) { 101 for(n=0; n<16 && n<len; ++n) 102 out[n] = in[n] ^ iv[n]; 103 for(; n<16; ++n) 104 out[n] = iv[n]; 105 (*block)(out, out, key); 106 iv = out; 107 if (len<=16) break; 108 len -= 16; 109 in += 16; 110 out += 16; 111 } 112 memcpy(ivec,iv,16); 113 } 114 115 void CRYPTO_cbc128_decrypt(const unsigned char *in, unsigned char *out, 116 size_t len, const void *key, 117 unsigned char ivec[16], block128_f block) 118 { 119 size_t n; 120 union { size_t align; unsigned char c[16]; } tmp; 121 122 assert(in && out && key && ivec); 123 124 #if !defined(OPENSSL_SMALL_FOOTPRINT) 125 if (in != out) { 126 const unsigned char *iv = ivec; 127 128 if (STRICT_ALIGNMENT && 129 ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) { 130 while (len>=16) { 131 (*block)(in, out, key); 132 for(n=0; n<16; ++n) 133 out[n] ^= iv[n]; 134 iv = in; 135 len -= 16; 136 in += 16; 137 out += 16; 138 } 139 } 140 else { 141 while (len>=16) { 142 (*block)(in, out, key); 143 for(n=0; n<16; n+=sizeof(size_t)) 144 *(size_t *)(out+n) ^= *(size_t *)(iv+n); 145 iv = in; 146 len -= 16; 147 in += 16; 148 out += 16; 149 } 150 } 151 memcpy(ivec,iv,16); 152 } else { 153 if (STRICT_ALIGNMENT && 154 ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) { 155 unsigned char c; 156 while (len>=16) { 157 (*block)(in, tmp.c, key); 158 for(n=0; n<16; ++n) { 159 c = in[n]; 160 out[n] = tmp.c[n] ^ ivec[n]; 161 ivec[n] = c; 162 } 163 len -= 16; 164 in += 16; 165 out += 16; 166 } 167 } 168 else { 169 size_t c; 170 while (len>=16) { 171 (*block)(in, tmp.c, key); 172 for(n=0; n<16; n+=sizeof(size_t)) { 173 c = *(size_t *)(in+n); 174 *(size_t *)(out+n) = 175 *(size_t *)(tmp.c+n) ^ *(size_t *)(ivec+n); 176 *(size_t *)(ivec+n) = c; 177 } 178 len -= 16; 179 in += 16; 180 out += 16; 181 } 182 } 183 } 184 #endif 185 while (len) { 186 unsigned char c; 187 (*block)(in, tmp.c, key); 188 for(n=0; n<16 && n<len; ++n) { 189 c = in[n]; 190 out[n] = tmp.c[n] ^ ivec[n]; 191 ivec[n] = c; 192 } 193 if (len<=16) { 194 for (; n<16; ++n) 195 ivec[n] = in[n]; 196 break; 197 } 198 len -= 16; 199 in += 16; 200 out += 16; 201 } 202 } 203
