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 "modes.h" 52 #include <string.h> 53 54 #ifndef MODES_DEBUG 55 # ifndef NDEBUG 56 # define NDEBUG 57 # endif 58 #endif 59 #include <assert.h> 60 61 #define STRICT_ALIGNMENT 1 62 #if defined(__i386) || defined(__i386__) || \ 63 defined(__x86_64) || defined(__x86_64__) || \ 64 defined(_M_IX86) || defined(_M_AMD64) || defined(_M_X64) || \ 65 defined(__s390__) || defined(__s390x__) 66 # undef STRICT_ALIGNMENT 67 # define STRICT_ALIGNMENT 0 68 #endif 69 70 void CRYPTO_cbc128_encrypt(const unsigned char *in, unsigned char *out, 71 size_t len, const void *key, 72 unsigned char ivec[16], block128_f block) 73 { 74 size_t n; 75 const unsigned char *iv = ivec; 76 77 assert(in && out && key && ivec); 78 79 #if !defined(OPENSSL_SMALL_FOOTPRINT) 80 if (STRICT_ALIGNMENT && 81 ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) { 82 while (len>=16) { 83 for(n=0; n<16; ++n) 84 out[n] = in[n] ^ iv[n]; 85 (*block)(out, out, key); 86 iv = out; 87 len -= 16; 88 in += 16; 89 out += 16; 90 } 91 } else { 92 while (len>=16) { 93 for(n=0; n<16; n+=sizeof(size_t)) 94 *(size_t*)(out+n) = 95 *(size_t*)(in+n) ^ *(size_t*)(iv+n); 96 (*block)(out, out, key); 97 iv = out; 98 len -= 16; 99 in += 16; 100 out += 16; 101 } 102 } 103 #endif 104 while (len) { 105 for(n=0; n<16 && n<len; ++n) 106 out[n] = in[n] ^ iv[n]; 107 for(; n<16; ++n) 108 out[n] = iv[n]; 109 (*block)(out, out, key); 110 iv = out; 111 if (len<=16) break; 112 len -= 16; 113 in += 16; 114 out += 16; 115 } 116 memcpy(ivec,iv,16); 117 } 118 119 void CRYPTO_cbc128_decrypt(const unsigned char *in, unsigned char *out, 120 size_t len, const void *key, 121 unsigned char ivec[16], block128_f block) 122 { 123 size_t n; 124 union { size_t align; unsigned char c[16]; } tmp; 125 126 assert(in && out && key && ivec); 127 128 #if !defined(OPENSSL_SMALL_FOOTPRINT) 129 if (in != out) { 130 const unsigned char *iv = ivec; 131 132 if (STRICT_ALIGNMENT && 133 ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) { 134 while (len>=16) { 135 (*block)(in, out, key); 136 for(n=0; n<16; ++n) 137 out[n] ^= iv[n]; 138 iv = in; 139 len -= 16; 140 in += 16; 141 out += 16; 142 } 143 } 144 else { 145 while (len>=16) { 146 (*block)(in, out, key); 147 for(n=0; n<16; n+=sizeof(size_t)) 148 *(size_t *)(out+n) ^= *(size_t *)(iv+n); 149 iv = in; 150 len -= 16; 151 in += 16; 152 out += 16; 153 } 154 } 155 memcpy(ivec,iv,16); 156 } else { 157 if (STRICT_ALIGNMENT && 158 ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) { 159 unsigned char c; 160 while (len>=16) { 161 (*block)(in, tmp.c, key); 162 for(n=0; n<16; ++n) { 163 c = in[n]; 164 out[n] = tmp.c[n] ^ ivec[n]; 165 ivec[n] = c; 166 } 167 len -= 16; 168 in += 16; 169 out += 16; 170 } 171 } 172 else { 173 size_t c; 174 while (len>=16) { 175 (*block)(in, tmp.c, key); 176 for(n=0; n<16; n+=sizeof(size_t)) { 177 c = *(size_t *)(in+n); 178 *(size_t *)(out+n) = 179 *(size_t *)(tmp.c+n) ^ *(size_t *)(ivec+n); 180 *(size_t *)(ivec+n) = c; 181 } 182 len -= 16; 183 in += 16; 184 out += 16; 185 } 186 } 187 } 188 #endif 189 while (len) { 190 unsigned char c; 191 (*block)(in, tmp.c, key); 192 for(n=0; n<16 && n<len; ++n) { 193 c = in[n]; 194 out[n] = tmp.c[n] ^ ivec[n]; 195 ivec[n] = c; 196 } 197 if (len<=16) { 198 for (; n<16; ++n) 199 ivec[n] = in[n]; 200 break; 201 } 202 len -= 16; 203 in += 16; 204 out += 16; 205 } 206 } 207
