1 | /*
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2 | * Copyright 2006-2016 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 "internal/cryptlib.h"
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11 |
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12 | #include <openssl/aes.h>
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13 | #include "aes_locl.h"
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14 |
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15 | #define N_WORDS (AES_BLOCK_SIZE / sizeof(unsigned long))
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16 | typedef struct {
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17 | unsigned long data[N_WORDS];
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18 | } aes_block_t;
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19 |
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20 | /* XXX: probably some better way to do this */
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21 | #if defined(__i386__) || defined(__x86_64__)
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22 | # define UNALIGNED_MEMOPS_ARE_FAST 1
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23 | #else
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24 | # define UNALIGNED_MEMOPS_ARE_FAST 0
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25 | #endif
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26 |
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27 | #if UNALIGNED_MEMOPS_ARE_FAST
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28 | # define load_block(d, s) (d) = *(const aes_block_t *)(s)
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29 | # define store_block(d, s) *(aes_block_t *)(d) = (s)
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30 | #else
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31 | # define load_block(d, s) memcpy((d).data, (s), AES_BLOCK_SIZE)
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32 | # define store_block(d, s) memcpy((d), (s).data, AES_BLOCK_SIZE)
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33 | #endif
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34 |
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35 | /* N.B. The IV for this mode is _twice_ the block size */
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36 |
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37 | void AES_ige_encrypt(const unsigned char *in, unsigned char *out,
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38 | size_t length, const AES_KEY *key,
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39 | unsigned char *ivec, const int enc)
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40 | {
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41 | size_t n;
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42 | size_t len = length;
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43 |
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44 | OPENSSL_assert(in && out && key && ivec);
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45 | OPENSSL_assert((AES_ENCRYPT == enc) || (AES_DECRYPT == enc));
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46 | OPENSSL_assert((length % AES_BLOCK_SIZE) == 0);
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47 |
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48 | len = length / AES_BLOCK_SIZE;
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49 |
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50 | if (AES_ENCRYPT == enc) {
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51 | if (in != out &&
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52 | (UNALIGNED_MEMOPS_ARE_FAST
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53 | || ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(long) ==
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54 | 0)) {
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55 | aes_block_t *ivp = (aes_block_t *) ivec;
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56 | aes_block_t *iv2p = (aes_block_t *) (ivec + AES_BLOCK_SIZE);
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57 |
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58 | while (len) {
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59 | aes_block_t *inp = (aes_block_t *) in;
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60 | aes_block_t *outp = (aes_block_t *) out;
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61 |
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62 | for (n = 0; n < N_WORDS; ++n)
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63 | outp->data[n] = inp->data[n] ^ ivp->data[n];
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64 | AES_encrypt((unsigned char *)outp->data,
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65 | (unsigned char *)outp->data, key);
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66 | for (n = 0; n < N_WORDS; ++n)
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67 | outp->data[n] ^= iv2p->data[n];
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68 | ivp = outp;
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69 | iv2p = inp;
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70 | --len;
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71 | in += AES_BLOCK_SIZE;
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72 | out += AES_BLOCK_SIZE;
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73 | }
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74 | memcpy(ivec, ivp->data, AES_BLOCK_SIZE);
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75 | memcpy(ivec + AES_BLOCK_SIZE, iv2p->data, AES_BLOCK_SIZE);
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76 | } else {
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77 | aes_block_t tmp, tmp2;
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78 | aes_block_t iv;
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79 | aes_block_t iv2;
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80 |
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81 | load_block(iv, ivec);
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82 | load_block(iv2, ivec + AES_BLOCK_SIZE);
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83 |
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84 | while (len) {
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85 | load_block(tmp, in);
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86 | for (n = 0; n < N_WORDS; ++n)
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87 | tmp2.data[n] = tmp.data[n] ^ iv.data[n];
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88 | AES_encrypt((unsigned char *)tmp2.data,
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89 | (unsigned char *)tmp2.data, key);
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90 | for (n = 0; n < N_WORDS; ++n)
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91 | tmp2.data[n] ^= iv2.data[n];
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92 | store_block(out, tmp2);
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93 | iv = tmp2;
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94 | iv2 = tmp;
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95 | --len;
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96 | in += AES_BLOCK_SIZE;
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97 | out += AES_BLOCK_SIZE;
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98 | }
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99 | memcpy(ivec, iv.data, AES_BLOCK_SIZE);
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100 | memcpy(ivec + AES_BLOCK_SIZE, iv2.data, AES_BLOCK_SIZE);
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101 | }
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102 | } else {
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103 | if (in != out &&
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104 | (UNALIGNED_MEMOPS_ARE_FAST
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105 | || ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(long) ==
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106 | 0)) {
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107 | aes_block_t *ivp = (aes_block_t *) ivec;
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108 | aes_block_t *iv2p = (aes_block_t *) (ivec + AES_BLOCK_SIZE);
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109 |
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110 | while (len) {
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111 | aes_block_t tmp;
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112 | aes_block_t *inp = (aes_block_t *) in;
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113 | aes_block_t *outp = (aes_block_t *) out;
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114 |
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115 | for (n = 0; n < N_WORDS; ++n)
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116 | tmp.data[n] = inp->data[n] ^ iv2p->data[n];
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117 | AES_decrypt((unsigned char *)tmp.data,
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118 | (unsigned char *)outp->data, key);
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119 | for (n = 0; n < N_WORDS; ++n)
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120 | outp->data[n] ^= ivp->data[n];
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121 | ivp = inp;
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122 | iv2p = outp;
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123 | --len;
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124 | in += AES_BLOCK_SIZE;
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125 | out += AES_BLOCK_SIZE;
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126 | }
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127 | memcpy(ivec, ivp->data, AES_BLOCK_SIZE);
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128 | memcpy(ivec + AES_BLOCK_SIZE, iv2p->data, AES_BLOCK_SIZE);
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129 | } else {
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130 | aes_block_t tmp, tmp2;
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131 | aes_block_t iv;
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132 | aes_block_t iv2;
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133 |
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134 | load_block(iv, ivec);
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135 | load_block(iv2, ivec + AES_BLOCK_SIZE);
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136 |
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137 | while (len) {
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138 | load_block(tmp, in);
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139 | tmp2 = tmp;
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140 | for (n = 0; n < N_WORDS; ++n)
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141 | tmp.data[n] ^= iv2.data[n];
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142 | AES_decrypt((unsigned char *)tmp.data,
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143 | (unsigned char *)tmp.data, key);
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144 | for (n = 0; n < N_WORDS; ++n)
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145 | tmp.data[n] ^= iv.data[n];
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146 | store_block(out, tmp);
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147 | iv = tmp2;
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148 | iv2 = tmp;
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149 | --len;
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150 | in += AES_BLOCK_SIZE;
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151 | out += AES_BLOCK_SIZE;
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152 | }
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153 | memcpy(ivec, iv.data, AES_BLOCK_SIZE);
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154 | memcpy(ivec + AES_BLOCK_SIZE, iv2.data, AES_BLOCK_SIZE);
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155 | }
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156 | }
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157 | }
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158 |
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159 | /*
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160 | * Note that its effectively impossible to do biIGE in anything other
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161 | * than a single pass, so no provision is made for chaining.
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162 | */
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163 |
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164 | /* N.B. The IV for this mode is _four times_ the block size */
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165 |
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166 | void AES_bi_ige_encrypt(const unsigned char *in, unsigned char *out,
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167 | size_t length, const AES_KEY *key,
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168 | const AES_KEY *key2, const unsigned char *ivec,
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169 | const int enc)
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170 | {
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171 | size_t n;
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172 | size_t len = length;
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173 | unsigned char tmp[AES_BLOCK_SIZE];
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174 | unsigned char tmp2[AES_BLOCK_SIZE];
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175 | unsigned char tmp3[AES_BLOCK_SIZE];
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176 | unsigned char prev[AES_BLOCK_SIZE];
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177 | const unsigned char *iv;
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178 | const unsigned char *iv2;
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179 |
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180 | OPENSSL_assert(in && out && key && ivec);
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181 | OPENSSL_assert((AES_ENCRYPT == enc) || (AES_DECRYPT == enc));
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182 | OPENSSL_assert((length % AES_BLOCK_SIZE) == 0);
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183 |
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184 | if (AES_ENCRYPT == enc) {
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185 | /*
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186 | * XXX: Do a separate case for when in != out (strictly should check
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187 | * for overlap, too)
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188 | */
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189 |
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190 | /* First the forward pass */
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191 | iv = ivec;
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192 | iv2 = ivec + AES_BLOCK_SIZE;
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193 | while (len >= AES_BLOCK_SIZE) {
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194 | for (n = 0; n < AES_BLOCK_SIZE; ++n)
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195 | out[n] = in[n] ^ iv[n];
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196 | AES_encrypt(out, out, key);
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197 | for (n = 0; n < AES_BLOCK_SIZE; ++n)
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198 | out[n] ^= iv2[n];
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199 | iv = out;
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200 | memcpy(prev, in, AES_BLOCK_SIZE);
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201 | iv2 = prev;
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202 | len -= AES_BLOCK_SIZE;
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203 | in += AES_BLOCK_SIZE;
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204 | out += AES_BLOCK_SIZE;
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205 | }
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206 |
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207 | /* And now backwards */
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208 | iv = ivec + AES_BLOCK_SIZE * 2;
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209 | iv2 = ivec + AES_BLOCK_SIZE * 3;
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210 | len = length;
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211 | while (len >= AES_BLOCK_SIZE) {
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212 | out -= AES_BLOCK_SIZE;
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213 | /*
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214 | * XXX: reduce copies by alternating between buffers
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215 | */
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216 | memcpy(tmp, out, AES_BLOCK_SIZE);
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217 | for (n = 0; n < AES_BLOCK_SIZE; ++n)
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218 | out[n] ^= iv[n];
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219 | /*
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220 | * hexdump(stdout, "out ^ iv", out, AES_BLOCK_SIZE);
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221 | */
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222 | AES_encrypt(out, out, key);
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223 | /*
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224 | * hexdump(stdout,"enc", out, AES_BLOCK_SIZE);
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225 | */
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226 | /*
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227 | * hexdump(stdout,"iv2", iv2, AES_BLOCK_SIZE);
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228 | */
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229 | for (n = 0; n < AES_BLOCK_SIZE; ++n)
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230 | out[n] ^= iv2[n];
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231 | /*
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232 | * hexdump(stdout,"out", out, AES_BLOCK_SIZE);
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233 | */
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234 | iv = out;
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235 | memcpy(prev, tmp, AES_BLOCK_SIZE);
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236 | iv2 = prev;
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237 | len -= AES_BLOCK_SIZE;
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238 | }
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239 | } else {
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240 | /* First backwards */
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241 | iv = ivec + AES_BLOCK_SIZE * 2;
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242 | iv2 = ivec + AES_BLOCK_SIZE * 3;
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243 | in += length;
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244 | out += length;
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245 | while (len >= AES_BLOCK_SIZE) {
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246 | in -= AES_BLOCK_SIZE;
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247 | out -= AES_BLOCK_SIZE;
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248 | memcpy(tmp, in, AES_BLOCK_SIZE);
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249 | memcpy(tmp2, in, AES_BLOCK_SIZE);
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250 | for (n = 0; n < AES_BLOCK_SIZE; ++n)
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251 | tmp[n] ^= iv2[n];
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252 | AES_decrypt(tmp, out, key);
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253 | for (n = 0; n < AES_BLOCK_SIZE; ++n)
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254 | out[n] ^= iv[n];
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255 | memcpy(tmp3, tmp2, AES_BLOCK_SIZE);
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256 | iv = tmp3;
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257 | iv2 = out;
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258 | len -= AES_BLOCK_SIZE;
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259 | }
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260 |
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261 | /* And now forwards */
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262 | iv = ivec;
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263 | iv2 = ivec + AES_BLOCK_SIZE;
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264 | len = length;
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265 | while (len >= AES_BLOCK_SIZE) {
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266 | memcpy(tmp, out, AES_BLOCK_SIZE);
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267 | memcpy(tmp2, out, AES_BLOCK_SIZE);
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268 | for (n = 0; n < AES_BLOCK_SIZE; ++n)
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269 | tmp[n] ^= iv2[n];
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270 | AES_decrypt(tmp, out, key);
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271 | for (n = 0; n < AES_BLOCK_SIZE; ++n)
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272 | out[n] ^= iv[n];
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273 | memcpy(tmp3, tmp2, AES_BLOCK_SIZE);
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274 | iv = tmp3;
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275 | iv2 = out;
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276 | len -= AES_BLOCK_SIZE;
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277 | in += AES_BLOCK_SIZE;
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278 | out += AES_BLOCK_SIZE;
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279 | }
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280 | }
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281 | }
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