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| 1 | +/**************************************************************************/ |
| 2 | +/* dxil_hash.cpp */ |
| 3 | +/**************************************************************************/ |
| 4 | +/* This file is part of: */ |
| 5 | +/* GODOT ENGINE */ |
| 6 | +/* https://godotengine.org */ |
| 7 | +/**************************************************************************/ |
| 8 | +/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */ |
| 9 | +/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */ |
| 10 | +/* */ |
| 11 | +/* Permission is hereby granted, free of charge, to any person obtaining */ |
| 12 | +/* a copy of this software and associated documentation files (the */ |
| 13 | +/* "Software"), to deal in the Software without restriction, including */ |
| 14 | +/* without limitation the rights to use, copy, modify, merge, publish, */ |
| 15 | +/* distribute, sublicense, and/or sell copies of the Software, and to */ |
| 16 | +/* permit persons to whom the Software is furnished to do so, subject to */ |
| 17 | +/* the following conditions: */ |
| 18 | +/* */ |
| 19 | +/* The above copyright notice and this permission notice shall be */ |
| 20 | +/* included in all copies or substantial portions of the Software. */ |
| 21 | +/* */ |
| 22 | +/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */ |
| 23 | +/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */ |
| 24 | +/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */ |
| 25 | +/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */ |
| 26 | +/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */ |
| 27 | +/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */ |
| 28 | +/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ |
| 29 | +/**************************************************************************/ |
| 30 | + |
| 31 | +// Based on the patched public domain implementation released by Microsoft here: |
| 32 | +// https://github.com/microsoft/hlsl-specs/blob/main/proposals/infra/INF-0004-validator-hashing.md |
| 33 | + |
| 34 | +#include "dxil_hash.h" |
| 35 | + |
| 36 | +#include <memory.h> |
| 37 | + |
| 38 | +#define S11 7 |
| 39 | +#define S12 12 |
| 40 | +#define S13 17 |
| 41 | +#define S14 22 |
| 42 | +#define S21 5 |
| 43 | +#define S22 9 |
| 44 | +#define S23 14 |
| 45 | +#define S24 20 |
| 46 | +#define S31 4 |
| 47 | +#define S32 11 |
| 48 | +#define S33 16 |
| 49 | +#define S34 23 |
| 50 | +#define S41 6 |
| 51 | +#define S42 10 |
| 52 | +#define S43 15 |
| 53 | +#define S44 21 |
| 54 | + |
| 55 | +static const BYTE padding[64] = { |
| 56 | + 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 57 | + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 58 | + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 59 | + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 |
| 60 | +}; |
| 61 | + |
| 62 | +static void FF(UINT &a, UINT b, UINT c, UINT d, UINT x, UINT8 s, UINT ac) { |
| 63 | + a += ((b & c) | (~b & d)) + x + ac; |
| 64 | + a = ((a << s) | (a >> (32 - s))) + b; |
| 65 | +} |
| 66 | + |
| 67 | +static void GG(UINT &a, UINT b, UINT c, UINT d, UINT x, UINT8 s, UINT ac) { |
| 68 | + a += ((b & d) | (c & ~d)) + x + ac; |
| 69 | + a = ((a << s) | (a >> (32 - s))) + b; |
| 70 | +} |
| 71 | + |
| 72 | +static void HH(UINT &a, UINT b, UINT c, UINT d, UINT x, UINT8 s, UINT ac) { |
| 73 | + a += (b ^ c ^ d) + x + ac; |
| 74 | + a = ((a << s) | (a >> (32 - s))) + b; |
| 75 | +} |
| 76 | + |
| 77 | +static void II(UINT &a, UINT b, UINT c, UINT d, UINT x, UINT8 s, UINT ac) { |
| 78 | + a += (c ^ (b | ~d)) + x + ac; |
| 79 | + a = ((a << s) | (a >> (32 - s))) + b; |
| 80 | +} |
| 81 | + |
| 82 | +void compute_dxil_hash(const BYTE *pData, UINT byteCount, BYTE *pOutHash) { |
| 83 | + UINT leftOver = byteCount & 0x3f; |
| 84 | + UINT padAmount; |
| 85 | + bool bTwoRowsPadding = false; |
| 86 | + if (leftOver < 56) { |
| 87 | + padAmount = 56 - leftOver; |
| 88 | + } else { |
| 89 | + padAmount = 120 - leftOver; |
| 90 | + bTwoRowsPadding = true; |
| 91 | + } |
| 92 | + UINT padAmountPlusSize = padAmount + 8; |
| 93 | + UINT state[4] = { 0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476 }; |
| 94 | + UINT N = (byteCount + padAmountPlusSize) >> 6; |
| 95 | + UINT offset = 0; |
| 96 | + UINT NextEndState = bTwoRowsPadding ? N - 2 : N - 1; |
| 97 | + const BYTE *pCurrData = pData; |
| 98 | + for (UINT i = 0; i < N; i++, offset += 64, pCurrData += 64) { |
| 99 | + UINT x[16]; |
| 100 | + const UINT *pX; |
| 101 | + if (i == NextEndState) { |
| 102 | + if (!bTwoRowsPadding && i == N - 1) { |
| 103 | + UINT remainder = byteCount - offset; |
| 104 | + x[0] = byteCount << 3; |
| 105 | + memcpy((BYTE *)x + 4, pCurrData, remainder); |
| 106 | + memcpy((BYTE *)x + 4 + remainder, padding, padAmount); |
| 107 | + x[15] = 1 | (byteCount << 1); |
| 108 | + } else if (bTwoRowsPadding) { |
| 109 | + if (i == N - 2) { |
| 110 | + UINT remainder = byteCount - offset; |
| 111 | + memcpy(x, pCurrData, remainder); |
| 112 | + memcpy((BYTE *)x + remainder, padding, padAmount - 56); |
| 113 | + NextEndState = N - 1; |
| 114 | + } else if (i == N - 1) { |
| 115 | + x[0] = byteCount << 3; |
| 116 | + memcpy((BYTE *)x + 4, padding + padAmount - 56, 56); |
| 117 | + x[15] = 1 | (byteCount << 1); |
| 118 | + } |
| 119 | + } |
| 120 | + pX = x; |
| 121 | + } else { |
| 122 | + pX = (const UINT *)pCurrData; |
| 123 | + } |
| 124 | + |
| 125 | + UINT a = state[0]; |
| 126 | + UINT b = state[1]; |
| 127 | + UINT c = state[2]; |
| 128 | + UINT d = state[3]; |
| 129 | + |
| 130 | + /* Round 1 */ |
| 131 | + FF(a, b, c, d, pX[0], S11, 0xd76aa478); /* 1 */ |
| 132 | + FF(d, a, b, c, pX[1], S12, 0xe8c7b756); /* 2 */ |
| 133 | + FF(c, d, a, b, pX[2], S13, 0x242070db); /* 3 */ |
| 134 | + FF(b, c, d, a, pX[3], S14, 0xc1bdceee); /* 4 */ |
| 135 | + FF(a, b, c, d, pX[4], S11, 0xf57c0faf); /* 5 */ |
| 136 | + FF(d, a, b, c, pX[5], S12, 0x4787c62a); /* 6 */ |
| 137 | + FF(c, d, a, b, pX[6], S13, 0xa8304613); /* 7 */ |
| 138 | + FF(b, c, d, a, pX[7], S14, 0xfd469501); /* 8 */ |
| 139 | + FF(a, b, c, d, pX[8], S11, 0x698098d8); /* 9 */ |
| 140 | + FF(d, a, b, c, pX[9], S12, 0x8b44f7af); /* 10 */ |
| 141 | + FF(c, d, a, b, pX[10], S13, 0xffff5bb1); /* 11 */ |
| 142 | + FF(b, c, d, a, pX[11], S14, 0x895cd7be); /* 12 */ |
| 143 | + FF(a, b, c, d, pX[12], S11, 0x6b901122); /* 13 */ |
| 144 | + FF(d, a, b, c, pX[13], S12, 0xfd987193); /* 14 */ |
| 145 | + FF(c, d, a, b, pX[14], S13, 0xa679438e); /* 15 */ |
| 146 | + FF(b, c, d, a, pX[15], S14, 0x49b40821); /* 16 */ |
| 147 | + |
| 148 | + /* Round 2 */ |
| 149 | + GG(a, b, c, d, pX[1], S21, 0xf61e2562); /* 17 */ |
| 150 | + GG(d, a, b, c, pX[6], S22, 0xc040b340); /* 18 */ |
| 151 | + GG(c, d, a, b, pX[11], S23, 0x265e5a51); /* 19 */ |
| 152 | + GG(b, c, d, a, pX[0], S24, 0xe9b6c7aa); /* 20 */ |
| 153 | + GG(a, b, c, d, pX[5], S21, 0xd62f105d); /* 21 */ |
| 154 | + GG(d, a, b, c, pX[10], S22, 0x2441453); /* 22 */ |
| 155 | + GG(c, d, a, b, pX[15], S23, 0xd8a1e681); /* 23 */ |
| 156 | + GG(b, c, d, a, pX[4], S24, 0xe7d3fbc8); /* 24 */ |
| 157 | + GG(a, b, c, d, pX[9], S21, 0x21e1cde6); /* 25 */ |
| 158 | + GG(d, a, b, c, pX[14], S22, 0xc33707d6); /* 26 */ |
| 159 | + GG(c, d, a, b, pX[3], S23, 0xf4d50d87); /* 27 */ |
| 160 | + GG(b, c, d, a, pX[8], S24, 0x455a14ed); /* 28 */ |
| 161 | + GG(a, b, c, d, pX[13], S21, 0xa9e3e905); /* 29 */ |
| 162 | + GG(d, a, b, c, pX[2], S22, 0xfcefa3f8); /* 30 */ |
| 163 | + GG(c, d, a, b, pX[7], S23, 0x676f02d9); /* 31 */ |
| 164 | + GG(b, c, d, a, pX[12], S24, 0x8d2a4c8a); /* 32 */ |
| 165 | + |
| 166 | + /* Round 3 */ |
| 167 | + HH(a, b, c, d, pX[5], S31, 0xfffa3942); /* 33 */ |
| 168 | + HH(d, a, b, c, pX[8], S32, 0x8771f681); /* 34 */ |
| 169 | + HH(c, d, a, b, pX[11], S33, 0x6d9d6122); /* 35 */ |
| 170 | + HH(b, c, d, a, pX[14], S34, 0xfde5380c); /* 36 */ |
| 171 | + HH(a, b, c, d, pX[1], S31, 0xa4beea44); /* 37 */ |
| 172 | + HH(d, a, b, c, pX[4], S32, 0x4bdecfa9); /* 38 */ |
| 173 | + HH(c, d, a, b, pX[7], S33, 0xf6bb4b60); /* 39 */ |
| 174 | + HH(b, c, d, a, pX[10], S34, 0xbebfbc70); /* 40 */ |
| 175 | + HH(a, b, c, d, pX[13], S31, 0x289b7ec6); /* 41 */ |
| 176 | + HH(d, a, b, c, pX[0], S32, 0xeaa127fa); /* 42 */ |
| 177 | + HH(c, d, a, b, pX[3], S33, 0xd4ef3085); /* 43 */ |
| 178 | + HH(b, c, d, a, pX[6], S34, 0x4881d05); /* 44 */ |
| 179 | + HH(a, b, c, d, pX[9], S31, 0xd9d4d039); /* 45 */ |
| 180 | + HH(d, a, b, c, pX[12], S32, 0xe6db99e5); /* 46 */ |
| 181 | + HH(c, d, a, b, pX[15], S33, 0x1fa27cf8); /* 47 */ |
| 182 | + HH(b, c, d, a, pX[2], S34, 0xc4ac5665); /* 48 */ |
| 183 | + |
| 184 | + /* Round 4 */ |
| 185 | + II(a, b, c, d, pX[0], S41, 0xf4292244); /* 49 */ |
| 186 | + II(d, a, b, c, pX[7], S42, 0x432aff97); /* 50 */ |
| 187 | + II(c, d, a, b, pX[14], S43, 0xab9423a7); /* 51 */ |
| 188 | + II(b, c, d, a, pX[5], S44, 0xfc93a039); /* 52 */ |
| 189 | + II(a, b, c, d, pX[12], S41, 0x655b59c3); /* 53 */ |
| 190 | + II(d, a, b, c, pX[3], S42, 0x8f0ccc92); /* 54 */ |
| 191 | + II(c, d, a, b, pX[10], S43, 0xffeff47d); /* 55 */ |
| 192 | + II(b, c, d, a, pX[1], S44, 0x85845dd1); /* 56 */ |
| 193 | + II(a, b, c, d, pX[8], S41, 0x6fa87e4f); /* 57 */ |
| 194 | + II(d, a, b, c, pX[15], S42, 0xfe2ce6e0); /* 58 */ |
| 195 | + II(c, d, a, b, pX[6], S43, 0xa3014314); /* 59 */ |
| 196 | + II(b, c, d, a, pX[13], S44, 0x4e0811a1); /* 60 */ |
| 197 | + II(a, b, c, d, pX[4], S41, 0xf7537e82); /* 61 */ |
| 198 | + II(d, a, b, c, pX[11], S42, 0xbd3af235); /* 62 */ |
| 199 | + II(c, d, a, b, pX[2], S43, 0x2ad7d2bb); /* 63 */ |
| 200 | + II(b, c, d, a, pX[9], S44, 0xeb86d391); /* 64 */ |
| 201 | + |
| 202 | + state[0] += a; |
| 203 | + state[1] += b; |
| 204 | + state[2] += c; |
| 205 | + state[3] += d; |
| 206 | + } |
| 207 | + |
| 208 | + memcpy(pOutHash, state, 16); |
| 209 | +} |
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