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