[164] | 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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