/**************************************************************************/
/* dxil_hash.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/
// Based on the patched public domain implementation released by Microsoft here:
// https://github.com/microsoft/hlsl-specs/blob/main/proposals/infra/INF-0004-validator-hashing.md
#include "dxil_hash.h"
#include <memory.h>
#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21
static const BYTE padding[64] = {
0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
static void FF(UINT &a, UINT b, UINT c, UINT d, UINT x, UINT8 s, UINT ac) {
a += ((b & c) | (~b & d)) + x + ac;
a = ((a << s) | (a >> (32 - s))) + b;
}
static void GG(UINT &a, UINT b, UINT c, UINT d, UINT x, UINT8 s, UINT ac) {
a += ((b & d) | (c & ~d)) + x + ac;
a = ((a << s) | (a >> (32 - s))) + b;
}
static void HH(UINT &a, UINT b, UINT c, UINT d, UINT x, UINT8 s, UINT ac) {
a += (b ^ c ^ d) + x + ac;
a = ((a << s) | (a >> (32 - s))) + b;
}
static void II(UINT &a, UINT b, UINT c, UINT d, UINT x, UINT8 s, UINT ac) {
a += (c ^ (b | ~d)) + x + ac;
a = ((a << s) | (a >> (32 - s))) + b;
}
void compute_dxil_hash(const BYTE *pData, UINT byteCount, BYTE *pOutHash) {
UINT leftOver = byteCount & 0x3f;
UINT padAmount;
bool bTwoRowsPadding = false;
if (leftOver < 56) {
padAmount = 56 - leftOver;
} else {
padAmount = 120 - leftOver;
bTwoRowsPadding = true;
}
UINT padAmountPlusSize = padAmount + 8;
UINT state[4] = { 0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476 };
UINT N = (byteCount + padAmountPlusSize) >> 6;
UINT offset = 0;
UINT NextEndState = bTwoRowsPadding ? N - 2 : N - 1;
const BYTE *pCurrData = pData;
for (UINT i = 0; i < N; i++, offset += 64, pCurrData += 64) {
UINT x[16] = {};
const UINT *pX;
if (i == NextEndState) {
if (!bTwoRowsPadding && i == N - 1) {
UINT remainder = byteCount - offset;
x[0] = byteCount << 3;
memcpy((BYTE *)x + 4, pCurrData, remainder);
memcpy((BYTE *)x + 4 + remainder, padding, padAmount);
x[15] = 1 | (byteCount << 1);
} else if (bTwoRowsPadding) {
if (i == N - 2) {
UINT remainder = byteCount - offset;
memcpy(x, pCurrData, remainder);
memcpy((BYTE *)x + remainder, padding, padAmount - 56);
NextEndState = N - 1;
} else if (i == N - 1) {
x[0] = byteCount << 3;
memcpy((BYTE *)x + 4, padding + padAmount - 56, 56);
x[15] = 1 | (byteCount << 1);
}
}
pX = x;
} else {
pX = (const UINT *)pCurrData;
}
UINT a = state[0];
UINT b = state[1];
UINT c = state[2];
UINT d = state[3];
/* Round 1 */
FF(a, b, c, d, pX[0], S11, 0xd76aa478); /* 1 */
FF(d, a, b, c, pX[1], S12, 0xe8c7b756); /* 2 */
FF(c, d, a, b, pX[2], S13, 0x242070db); /* 3 */
FF(b, c, d, a, pX[3], S14, 0xc1bdceee); /* 4 */
FF(a, b, c, d, pX[4], S11, 0xf57c0faf); /* 5 */
FF(d, a, b, c, pX[5], S12, 0x4787c62a); /* 6 */
FF(c, d, a, b, pX[6], S13, 0xa8304613); /* 7 */
FF(b, c, d, a, pX[7], S14, 0xfd469501); /* 8 */
FF(a, b, c, d, pX[8], S11, 0x698098d8); /* 9 */
FF(d, a, b, c, pX[9], S12, 0x8b44f7af); /* 10 */
FF(c, d, a, b, pX[10], S13, 0xffff5bb1); /* 11 */
FF(b, c, d, a, pX[11], S14, 0x895cd7be); /* 12 */
FF(a, b, c, d, pX[12], S11, 0x6b901122); /* 13 */
FF(d, a, b, c, pX[13], S12, 0xfd987193); /* 14 */
FF(c, d, a, b, pX[14], S13, 0xa679438e); /* 15 */
FF(b, c, d, a, pX[15], S14, 0x49b40821); /* 16 */
/* Round 2 */
GG(a, b, c, d, pX[1], S21, 0xf61e2562); /* 17 */
GG(d, a, b, c, pX[6], S22, 0xc040b340); /* 18 */
GG(c, d, a, b, pX[11], S23, 0x265e5a51); /* 19 */
GG(b, c, d, a, pX[0], S24, 0xe9b6c7aa); /* 20 */
GG(a, b, c, d, pX[5], S21, 0xd62f105d); /* 21 */
GG(d, a, b, c, pX[10], S22, 0x2441453); /* 22 */
GG(c, d, a, b, pX[15], S23, 0xd8a1e681); /* 23 */
GG(b, c, d, a, pX[4], S24, 0xe7d3fbc8); /* 24 */
GG(a, b, c, d, pX[9], S21, 0x21e1cde6); /* 25 */
GG(d, a, b, c, pX[14], S22, 0xc33707d6); /* 26 */
GG(c, d, a, b, pX[3], S23, 0xf4d50d87); /* 27 */
GG(b, c, d, a, pX[8], S24, 0x455a14ed); /* 28 */
GG(a, b, c, d, pX[13], S21, 0xa9e3e905); /* 29 */
GG(d, a, b, c, pX[2], S22, 0xfcefa3f8); /* 30 */
GG(c, d, a, b, pX[7], S23, 0x676f02d9); /* 31 */
GG(b, c, d, a, pX[12], S24, 0x8d2a4c8a); /* 32 */
/* Round 3 */
HH(a, b, c, d, pX[5], S31, 0xfffa3942); /* 33 */
HH(d, a, b, c, pX[8], S32, 0x8771f681); /* 34 */
HH(c, d, a, b, pX[11], S33, 0x6d9d6122); /* 35 */
HH(b, c, d, a, pX[14], S34, 0xfde5380c); /* 36 */
HH(a, b, c, d, pX[1], S31, 0xa4beea44); /* 37 */
HH(d, a, b, c, pX[4], S32, 0x4bdecfa9); /* 38 */
HH(c, d, a, b, pX[7], S33, 0xf6bb4b60); /* 39 */
HH(b, c, d, a, pX[10], S34, 0xbebfbc70); /* 40 */
HH(a, b, c, d, pX[13], S31, 0x289b7ec6); /* 41 */
HH(d, a, b, c, pX[0], S32, 0xeaa127fa); /* 42 */
HH(c, d, a, b, pX[3], S33, 0xd4ef3085); /* 43 */
HH(b, c, d, a, pX[6], S34, 0x4881d05); /* 44 */
HH(a, b, c, d, pX[9], S31, 0xd9d4d039); /* 45 */
HH(d, a, b, c, pX[12], S32, 0xe6db99e5); /* 46 */
HH(c, d, a, b, pX[15], S33, 0x1fa27cf8); /* 47 */
HH(b, c, d, a, pX[2], S34, 0xc4ac5665); /* 48 */
/* Round 4 */
II(a, b, c, d, pX[0], S41, 0xf4292244); /* 49 */
II(d, a, b, c, pX[7], S42, 0x432aff97); /* 50 */
II(c, d, a, b, pX[14], S43, 0xab9423a7); /* 51 */
II(b, c, d, a, pX[5], S44, 0xfc93a039); /* 52 */
II(a, b, c, d, pX[12], S41, 0x655b59c3); /* 53 */
II(d, a, b, c, pX[3], S42, 0x8f0ccc92); /* 54 */
II(c, d, a, b, pX[10], S43, 0xffeff47d); /* 55 */
II(b, c, d, a, pX[1], S44, 0x85845dd1); /* 56 */
II(a, b, c, d, pX[8], S41, 0x6fa87e4f); /* 57 */
II(d, a, b, c, pX[15], S42, 0xfe2ce6e0); /* 58 */
II(c, d, a, b, pX[6], S43, 0xa3014314); /* 59 */
II(b, c, d, a, pX[13], S44, 0x4e0811a1); /* 60 */
II(a, b, c, d, pX[4], S41, 0xf7537e82); /* 61 */
II(d, a, b, c, pX[11], S42, 0xbd3af235); /* 62 */
II(c, d, a, b, pX[2], S43, 0x2ad7d2bb); /* 63 */
II(b, c, d, a, pX[9], S44, 0xeb86d391); /* 64 */
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
}
memcpy(pOutHash, state, 16);
}
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