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| 1 /* ==================================================================== | |
| 2 * Copyright (c) 2011 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 #include <openssl/crypto.h> | |
| 51 #include "modes_lcl.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 int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, const unsigned char iv[16], | |
| 62 const unsigned char *inp, unsigned char *out, | |
| 63 size_t len, int enc) | |
| 64 { | |
| 65 const union { long one; char little; } is_endian = {1}; | |
| 66 union { u64 u[2]; u32 d[4]; u8 c[16]; } tweak, scratch; | |
| 67 unsigned int i; | |
| 68 | |
| 69 if (len<16) return -1; | |
| 70 | |
| 71 memcpy(tweak.c, iv, 16); | |
| 72 | |
| 73 (*ctx->block2)(tweak.c,tweak.c,ctx->key2); | |
| 74 | |
| 75 if (!enc && (len%16)) len-=16; | |
| 76 | |
| 77 while (len>=16) { | |
| 78 #if defined(STRICT_ALIGNMENT) | |
| 79 memcpy(scratch.c,inp,16); | |
| 80 scratch.u[0] ^= tweak.u[0]; | |
| 81 scratch.u[1] ^= tweak.u[1]; | |
| 82 #else | |
| 83 scratch.u[0] = ((u64*)inp)[0]^tweak.u[0]; | |
| 84 scratch.u[1] = ((u64*)inp)[1]^tweak.u[1]; | |
| 85 #endif | |
| 86 (*ctx->block1)(scratch.c,scratch.c,ctx->key1); | |
| 87 #if defined(STRICT_ALIGNMENT) | |
| 88 scratch.u[0] ^= tweak.u[0]; | |
| 89 scratch.u[1] ^= tweak.u[1]; | |
| 90 memcpy(out,scratch.c,16); | |
| 91 #else | |
| 92 ((u64*)out)[0] = scratch.u[0]^=tweak.u[0]; | |
| 93 ((u64*)out)[1] = scratch.u[1]^=tweak.u[1]; | |
| 94 #endif | |
| 95 inp += 16; | |
| 96 out += 16; | |
| 97 len -= 16; | |
| 98 | |
| 99 if (len==0) return 0; | |
| 100 | |
| 101 if (is_endian.little) { | |
| 102 unsigned int carry,res; | |
| 103 | |
| 104 res = 0x87&(((int)tweak.d[3])>>31); | |
| 105 carry = (unsigned int)(tweak.u[0]>>63); | |
| 106 tweak.u[0] = (tweak.u[0]<<1)^res; | |
| 107 tweak.u[1] = (tweak.u[1]<<1)|carry; | |
| 108 } | |
| 109 else { | |
| 110 size_t c; | |
| 111 | |
| 112 for (c=0,i=0;i<16;++i) { | |
| 113 /*+ substitutes for |, because c is 1 bit */ | |
| 114 c += ((size_t)tweak.c[i])<<1; | |
| 115 tweak.c[i] = (u8)c; | |
| 116 c = c>>8; | |
| 117 } | |
| 118 tweak.c[0] ^= (u8)(0x87&(0-c)); | |
| 119 } | |
| 120 } | |
| 121 if (enc) { | |
| 122 for (i=0;i<len;++i) { | |
| 123 u8 c = inp[i]; | |
| 124 out[i] = scratch.c[i]; | |
| 125 scratch.c[i] = c; | |
| 126 } | |
| 127 scratch.u[0] ^= tweak.u[0]; | |
| 128 scratch.u[1] ^= tweak.u[1]; | |
| 129 (*ctx->block1)(scratch.c,scratch.c,ctx->key1); | |
| 130 scratch.u[0] ^= tweak.u[0]; | |
| 131 scratch.u[1] ^= tweak.u[1]; | |
| 132 memcpy(out-16,scratch.c,16); | |
| 133 } | |
| 134 else { | |
| 135 union { u64 u[2]; u8 c[16]; } tweak1; | |
| 136 | |
| 137 if (is_endian.little) { | |
| 138 unsigned int carry,res; | |
| 139 | |
| 140 res = 0x87&(((int)tweak.d[3])>>31); | |
| 141 carry = (unsigned int)(tweak.u[0]>>63); | |
| 142 tweak1.u[0] = (tweak.u[0]<<1)^res; | |
| 143 tweak1.u[1] = (tweak.u[1]<<1)|carry; | |
| 144 } | |
| 145 else { | |
| 146 size_t c; | |
| 147 | |
| 148 for (c=0,i=0;i<16;++i) { | |
| 149 /*+ substitutes for |, because c is 1 bit */ | |
| 150 c += ((size_t)tweak.c[i])<<1; | |
| 151 tweak1.c[i] = (u8)c; | |
| 152 c = c>>8; | |
| 153 } | |
| 154 tweak1.c[0] ^= (u8)(0x87&(0-c)); | |
| 155 } | |
| 156 #if defined(STRICT_ALIGNMENT) | |
| 157 memcpy(scratch.c,inp,16); | |
| 158 scratch.u[0] ^= tweak1.u[0]; | |
| 159 scratch.u[1] ^= tweak1.u[1]; | |
| 160 #else | |
| 161 scratch.u[0] = ((u64*)inp)[0]^tweak1.u[0]; | |
| 162 scratch.u[1] = ((u64*)inp)[1]^tweak1.u[1]; | |
| 163 #endif | |
| 164 (*ctx->block1)(scratch.c,scratch.c,ctx->key1); | |
| 165 scratch.u[0] ^= tweak1.u[0]; | |
| 166 scratch.u[1] ^= tweak1.u[1]; | |
| 167 | |
| 168 for (i=0;i<len;++i) { | |
| 169 u8 c = inp[16+i]; | |
| 170 out[16+i] = scratch.c[i]; | |
| 171 scratch.c[i] = c; | |
| 172 } | |
| 173 scratch.u[0] ^= tweak.u[0]; | |
| 174 scratch.u[1] ^= tweak.u[1]; | |
| 175 (*ctx->block1)(scratch.c,scratch.c,ctx->key1); | |
| 176 #if defined(STRICT_ALIGNMENT) | |
| 177 scratch.u[0] ^= tweak.u[0]; | |
| 178 scratch.u[1] ^= tweak.u[1]; | |
| 179 memcpy (out,scratch.c,16); | |
| 180 #else | |
| 181 ((u64*)out)[0] = scratch.u[0]^tweak.u[0]; | |
| 182 ((u64*)out)[1] = scratch.u[1]^tweak.u[1]; | |
| 183 #endif | |
| 184 } | |
| 185 | |
| 186 return 0; | |
| 187 } | |
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Chromium Code Reviews
Issue 2072073002:
Delete bundled copy of OpenSSL and replace with README. (Closed)
Base URL: https://chromium.googlesource.com/chromium/deps/openssl@master