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| 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@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 } |
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