[331] | 1 | /*
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| 2 | * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <openssl/crypto.h>
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| 11 | #include "modes_lcl.h"
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| 12 | #include <string.h>
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| 13 |
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| 14 | #if !defined(STRICT_ALIGNMENT) && !defined(PEDANTIC)
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| 15 | # define STRICT_ALIGNMENT 0
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| 16 | #endif
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| 17 |
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| 18 | void CRYPTO_cbc128_encrypt(const unsigned char *in, unsigned char *out,
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| 19 | size_t len, const void *key,
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| 20 | unsigned char ivec[16], block128_f block)
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| 21 | {
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| 22 | size_t n;
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| 23 | const unsigned char *iv = ivec;
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| 24 |
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| 25 | #if !defined(OPENSSL_SMALL_FOOTPRINT)
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| 26 | if (STRICT_ALIGNMENT &&
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| 27 | ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) {
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| 28 | while (len >= 16) {
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| 29 | for (n = 0; n < 16; ++n)
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| 30 | out[n] = in[n] ^ iv[n];
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| 31 | (*block) (out, out, key);
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| 32 | iv = out;
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| 33 | len -= 16;
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| 34 | in += 16;
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| 35 | out += 16;
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| 36 | }
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| 37 | } else {
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| 38 | while (len >= 16) {
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| 39 | for (n = 0; n < 16; n += sizeof(size_t))
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| 40 | *(size_t *)(out + n) =
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| 41 | *(size_t *)(in + n) ^ *(size_t *)(iv + n);
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| 42 | (*block) (out, out, key);
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| 43 | iv = out;
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| 44 | len -= 16;
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| 45 | in += 16;
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| 46 | out += 16;
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| 47 | }
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| 48 | }
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| 49 | #endif
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| 50 | while (len) {
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| 51 | for (n = 0; n < 16 && n < len; ++n)
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| 52 | out[n] = in[n] ^ iv[n];
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| 53 | for (; n < 16; ++n)
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| 54 | out[n] = iv[n];
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| 55 | (*block) (out, out, key);
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| 56 | iv = out;
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| 57 | if (len <= 16)
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| 58 | break;
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| 59 | len -= 16;
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| 60 | in += 16;
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| 61 | out += 16;
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| 62 | }
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| 63 | memcpy(ivec, iv, 16);
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| 64 | }
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| 65 |
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| 66 | void CRYPTO_cbc128_decrypt(const unsigned char *in, unsigned char *out,
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| 67 | size_t len, const void *key,
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| 68 | unsigned char ivec[16], block128_f block)
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| 69 | {
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| 70 | size_t n;
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| 71 | union {
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| 72 | size_t t[16 / sizeof(size_t)];
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| 73 | unsigned char c[16];
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| 74 | } tmp;
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| 75 |
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| 76 | #if !defined(OPENSSL_SMALL_FOOTPRINT)
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| 77 | if (in != out) {
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| 78 | const unsigned char *iv = ivec;
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| 79 |
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| 80 | if (STRICT_ALIGNMENT &&
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| 81 | ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) {
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| 82 | while (len >= 16) {
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| 83 | (*block) (in, out, key);
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| 84 | for (n = 0; n < 16; ++n)
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| 85 | out[n] ^= iv[n];
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| 86 | iv = in;
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| 87 | len -= 16;
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| 88 | in += 16;
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| 89 | out += 16;
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| 90 | }
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| 91 | } else if (16 % sizeof(size_t) == 0) { /* always true */
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| 92 | while (len >= 16) {
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| 93 | size_t *out_t = (size_t *)out, *iv_t = (size_t *)iv;
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| 94 |
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| 95 | (*block) (in, out, key);
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| 96 | for (n = 0; n < 16 / sizeof(size_t); n++)
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| 97 | out_t[n] ^= iv_t[n];
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| 98 | iv = in;
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| 99 | len -= 16;
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| 100 | in += 16;
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| 101 | out += 16;
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| 102 | }
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| 103 | }
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| 104 | memcpy(ivec, iv, 16);
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| 105 | } else {
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| 106 | if (STRICT_ALIGNMENT &&
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| 107 | ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) {
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| 108 | unsigned char c;
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| 109 | while (len >= 16) {
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| 110 | (*block) (in, tmp.c, key);
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| 111 | for (n = 0; n < 16; ++n) {
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| 112 | c = in[n];
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| 113 | out[n] = tmp.c[n] ^ ivec[n];
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| 114 | ivec[n] = c;
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| 115 | }
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| 116 | len -= 16;
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| 117 | in += 16;
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| 118 | out += 16;
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| 119 | }
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| 120 | } else if (16 % sizeof(size_t) == 0) { /* always true */
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| 121 | while (len >= 16) {
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| 122 | size_t c, *out_t = (size_t *)out, *ivec_t = (size_t *)ivec;
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| 123 | const size_t *in_t = (const size_t *)in;
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| 124 |
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| 125 | (*block) (in, tmp.c, key);
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| 126 | for (n = 0; n < 16 / sizeof(size_t); n++) {
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| 127 | c = in_t[n];
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| 128 | out_t[n] = tmp.t[n] ^ ivec_t[n];
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| 129 | ivec_t[n] = c;
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| 130 | }
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| 131 | len -= 16;
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| 132 | in += 16;
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| 133 | out += 16;
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| 134 | }
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| 135 | }
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| 136 | }
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| 137 | #endif
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| 138 | while (len) {
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| 139 | unsigned char c;
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| 140 | (*block) (in, tmp.c, key);
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| 141 | for (n = 0; n < 16 && n < len; ++n) {
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| 142 | c = in[n];
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| 143 | out[n] = tmp.c[n] ^ ivec[n];
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| 144 | ivec[n] = c;
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| 145 | }
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| 146 | if (len <= 16) {
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| 147 | for (; n < 16; ++n)
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| 148 | ivec[n] = in[n];
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| 149 | break;
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| 150 | }
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| 151 | len -= 16;
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| 152 | in += 16;
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| 153 | out += 16;
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| 154 | }
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| 155 | }
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