1 | /* misc.c
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2 | *
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3 | * Copyright (C) 2006-2015 wolfSSL Inc.
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4 | *
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5 | * This file is part of wolfSSL. (formerly known as CyaSSL)
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6 | *
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7 | * wolfSSL is free software; you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation; either version 2 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * wolfSSL is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with this program; if not, write to the Free Software
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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20 | */
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21 |
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22 | #ifdef HAVE_CONFIG_H
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23 | #include <config.h>
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24 | #endif
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25 |
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26 | #include <wolfssl/wolfcrypt/settings.h>
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27 |
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28 | #ifndef WOLF_CRYPT_MISC_C
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29 | #define WOLF_CRYPT_MISC_C
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30 |
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31 | #include <wolfssl/wolfcrypt/misc.h>
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32 |
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33 | /* inlining these functions is a huge speed increase and a small size decrease,
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34 | because the functions are smaller than function call setup/cleanup, e.g.,
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35 | md5 benchmark is twice as fast with inline. If you don't want it, then
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36 | define NO_INLINE and compile this file into wolfssl, otherwise it's used as
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37 | a source header
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38 | */
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39 |
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40 | #ifdef NO_INLINE
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41 | #define STATIC
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42 | #else
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43 | #define STATIC static
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44 | #endif
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45 |
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46 |
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47 | #ifdef INTEL_INTRINSICS
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48 |
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49 | #include <stdlib.h> /* get intrinsic definitions */
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50 |
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51 | /* for non visual studio probably need no long version, 32 bit only
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52 | * i.e., _rotl and _rotr */
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53 | #pragma intrinsic(_lrotl, _lrotr)
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54 |
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55 | STATIC INLINE word32 rotlFixed(word32 x, word32 y)
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56 | {
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57 | return y ? _lrotl(x, y) : x;
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58 | }
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59 |
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60 | STATIC INLINE word32 rotrFixed(word32 x, word32 y)
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61 | {
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62 | return y ? _lrotr(x, y) : x;
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63 | }
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64 |
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65 | #else /* generic */
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66 |
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67 | STATIC INLINE word32 rotlFixed(word32 x, word32 y)
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68 | {
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69 | return (x << y) | (x >> (sizeof(y) * 8 - y));
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70 | }
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71 |
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72 |
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73 | STATIC INLINE word32 rotrFixed(word32 x, word32 y)
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74 | {
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75 | return (x >> y) | (x << (sizeof(y) * 8 - y));
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76 | }
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77 |
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78 | #endif
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79 |
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80 |
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81 | STATIC INLINE word32 ByteReverseWord32(word32 value)
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82 | {
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83 | #ifdef PPC_INTRINSICS
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84 | /* PPC: load reverse indexed instruction */
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85 | return (word32)__lwbrx(&value,0);
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86 | #elif defined(KEIL_INTRINSICS)
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87 | return (word32)__rev(value);
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88 | #elif defined(FAST_ROTATE)
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89 | /* 5 instructions with rotate instruction, 9 without */
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90 | return (rotrFixed(value, 8U) & 0xff00ff00) |
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91 | (rotlFixed(value, 8U) & 0x00ff00ff);
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92 | #else
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93 | /* 6 instructions with rotate instruction, 8 without */
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94 | value = ((value & 0xFF00FF00) >> 8) | ((value & 0x00FF00FF) << 8);
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95 | return rotlFixed(value, 16U);
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96 | #endif
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97 | }
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98 |
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99 |
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100 | STATIC INLINE void ByteReverseWords(word32* out, const word32* in,
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101 | word32 byteCount)
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102 | {
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103 | word32 count = byteCount/(word32)sizeof(word32), i;
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104 |
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105 | for (i = 0; i < count; i++)
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106 | out[i] = ByteReverseWord32(in[i]);
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107 |
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108 | }
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109 |
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110 |
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111 | #ifdef WORD64_AVAILABLE
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112 |
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113 |
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114 | STATIC INLINE word64 rotlFixed64(word64 x, word64 y)
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115 | {
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116 | return (x << y) | (x >> (sizeof(y) * 8 - y));
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117 | }
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118 |
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119 |
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120 | STATIC INLINE word64 rotrFixed64(word64 x, word64 y)
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121 | {
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122 | return (x >> y) | (x << (sizeof(y) * 8 - y));
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123 | }
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124 |
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125 |
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126 | STATIC INLINE word64 ByteReverseWord64(word64 value)
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127 | {
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128 | #ifdef WOLFCRYPT_SLOW_WORD64
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129 | return (word64)(ByteReverseWord32((word32)value)) << 32 |
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130 | ByteReverseWord32((word32)(value>>32));
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131 | #else
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132 | value = ((value & W64LIT(0xFF00FF00FF00FF00)) >> 8) |
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133 | ((value & W64LIT(0x00FF00FF00FF00FF)) << 8);
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134 | value = ((value & W64LIT(0xFFFF0000FFFF0000)) >> 16) |
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135 | ((value & W64LIT(0x0000FFFF0000FFFF)) << 16);
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136 | return rotlFixed64(value, 32U);
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137 | #endif
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138 | }
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139 |
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140 |
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141 | STATIC INLINE void ByteReverseWords64(word64* out, const word64* in,
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142 | word32 byteCount)
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143 | {
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144 | word32 count = byteCount/(word32)sizeof(word64), i;
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145 |
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146 | for (i = 0; i < count; i++)
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147 | out[i] = ByteReverseWord64(in[i]);
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148 |
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149 | }
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150 |
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151 | #endif /* WORD64_AVAILABLE */
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152 |
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153 |
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154 | STATIC INLINE void XorWords(wolfssl_word* r, const wolfssl_word* a, word32 n)
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155 | {
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156 | word32 i;
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157 |
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158 | for (i = 0; i < n; i++) r[i] ^= a[i];
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159 | }
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160 |
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161 |
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162 | STATIC INLINE void xorbuf(void* buf, const void* mask, word32 count)
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163 | {
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164 | if (((wolfssl_word)buf | (wolfssl_word)mask | count) % WOLFSSL_WORD_SIZE == 0)
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165 | XorWords( (wolfssl_word*)buf,
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166 | (const wolfssl_word*)mask, count / WOLFSSL_WORD_SIZE);
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167 | else {
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168 | word32 i;
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169 | byte* b = (byte*)buf;
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170 | const byte* m = (const byte*)mask;
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171 |
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172 | for (i = 0; i < count; i++) b[i] ^= m[i];
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173 | }
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174 | }
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175 |
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176 |
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177 | /* Make sure compiler doesn't skip */
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178 | STATIC INLINE void ForceZero(const void* mem, word32 len)
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179 | {
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180 | volatile byte* z = (volatile byte*)mem;
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181 |
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182 | while (len--) *z++ = 0;
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183 | }
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184 |
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185 |
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186 | /* check all length bytes for equality, return 0 on success */
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187 | STATIC INLINE int ConstantCompare(const byte* a, const byte* b, int length)
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188 | {
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189 | int i;
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190 | int compareSum = 0;
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191 |
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192 | for (i = 0; i < length; i++) {
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193 | compareSum |= a[i] ^ b[i];
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194 | }
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195 |
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196 | return compareSum;
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197 | }
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198 |
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199 | #undef STATIC
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200 |
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201 | #endif /* WOLF_CRYPT_MISC_C */
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