228 lines
11 KiB
C#
228 lines
11 KiB
C#
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using System;
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using System.Security.Cryptography;
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/* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
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rights reserved.
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License to copy and use this software is granted provided that it
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is identified as the "RSA Data Security, Inc. MD4 Message-Digest
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Algorithm" in all material mentioning or referencing this software
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or this function.
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License is also granted to make and use derivative works provided
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that such works are identified as "derived from the RSA Data
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Security, Inc. MD4 Message-Digest Algorithm" in all material
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mentioning or referencing the derived work.
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RSA Data Security, Inc. makes no representations concerning either
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the merchantability of this software or the suitability of this
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software for any particular purpose. It is provided "as is"
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without express or implied warranty of any kind.
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These notices must be retained in any copies of any part of this
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documentation and/or software.
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*/
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/* Converted to C# by Ryan Caltabiano for Unity Technologies */
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namespace UnityEditor.Build.Pipeline.Utilities
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{
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/// <summary>
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/// Implementation of the MD4 hashing algorithm.
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/// </summary>
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public sealed class MD4 : HashAlgorithm
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{
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uint[] m_Buffer;
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uint[] m_Block;
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uint m_Bytes;
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static readonly byte[] kPadding =
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{
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0x80, 0, 0, 0, 0, 0, 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, 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, 0, 0, 0
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};
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MD4()
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{
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Initialize();
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}
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/// <summary>
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/// Creates a new MD4 hashing algorithm object.
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/// </summary>
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/// <returns>Returns the new MD4 hashing algorithm instance.</returns>
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public new static MD4 Create()
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{
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return new MD4();
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}
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/// <summary>
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/// Resets the hash algorithm to its initial state.
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/// </summary>
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public override void Initialize()
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{
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m_Buffer = new uint[]
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{
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0x67452301,
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0xefcdab89,
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0x98badcfe,
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0x10325476
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};
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m_Block = new uint[16];
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m_Bytes = 0;
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}
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/// <summary>
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/// When overridden in a derived class, routes data written to the object into the hash algorithm for computing the hash.
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/// </summary>
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/// <param name="array">The input to compute the hash code for.</param>
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/// <param name="ibStart">The offset into the byte array from which to begin using data.</param>
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/// <param name="cbSize">The number of bytes in the byte array to use as data.</param>
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protected override void HashCore(byte[] array, int ibStart, int cbSize)
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{
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if (array == null)
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throw new ArgumentNullException("array");
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for (var i = 0; i < cbSize; i++)
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{
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var b = array[ibStart + i];
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var c = m_Bytes & 63;
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var k = c >> 2;
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var s = (c & 3) << 3;
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m_Block[k] = (m_Block[k] & ~((uint)255 << (int)s)) | ((uint)b << (int)s);
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if (c == 63)
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ProcessBlock();
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m_Bytes++;
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}
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}
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/// <summary>
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/// When overridden in a derived class, finalizes the hash computation after the last data is processed by the cryptographic hash algorithm.
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/// </summary>
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/// <returns>Returns the computed hash.</returns>
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protected override byte[] HashFinal()
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{
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var bytes = BitConverter.GetBytes(m_Bytes << 3);
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var length = ((m_Bytes + 8) & 0x7fffffc0) + 56 - m_Bytes;
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HashCore(kPadding, 0, (int)length);
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HashCore(bytes, 0, 4);
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HashCore(kPadding, kPadding.Length - 4, 4);
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var output = new byte[16];
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output[0] = (byte)(m_Buffer[0] & 0xff);
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output[1] = (byte)((m_Buffer[0] >> 8) & 0xff);
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output[2] = (byte)((m_Buffer[0] >> 16) & 0xff);
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output[3] = (byte)((m_Buffer[0] >> 24) & 0xff);
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output[4] = (byte)(m_Buffer[1] & 0xff);
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output[5] = (byte)((m_Buffer[1] >> 8) & 0xff);
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output[6] = (byte)((m_Buffer[1] >> 16) & 0xff);
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output[7] = (byte)((m_Buffer[1] >> 24) & 0xff);
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output[8] = (byte)(m_Buffer[2] & 0xff);
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output[9] = (byte)((m_Buffer[2] >> 8) & 0xff);
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output[10] = (byte)((m_Buffer[2] >> 16) & 0xff);
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output[11] = (byte)((m_Buffer[2] >> 24) & 0xff);
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output[12] = (byte)(m_Buffer[3] & 0xff);
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output[13] = (byte)((m_Buffer[3] >> 8) & 0xff);
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output[14] = (byte)((m_Buffer[3] >> 16) & 0xff);
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output[15] = (byte)((m_Buffer[3] >> 24) & 0xff);
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return output;
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}
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void ProcessBlock()
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{
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var buffer = new uint[4];
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Array.Copy(m_Buffer, buffer, 4);
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/* Round 1 */
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buffer[0] = RotateLeft(buffer[0] + F(buffer[1], buffer[2], buffer[3]) + m_Block[0], 3);
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buffer[3] = RotateLeft(buffer[3] + F(buffer[0], buffer[1], buffer[2]) + m_Block[1], 7);
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buffer[2] = RotateLeft(buffer[2] + F(buffer[3], buffer[0], buffer[1]) + m_Block[2], 11);
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buffer[1] = RotateLeft(buffer[1] + F(buffer[2], buffer[3], buffer[0]) + m_Block[3], 19);
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buffer[0] = RotateLeft(buffer[0] + F(buffer[1], buffer[2], buffer[3]) + m_Block[4], 3);
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buffer[3] = RotateLeft(buffer[3] + F(buffer[0], buffer[1], buffer[2]) + m_Block[5], 7);
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buffer[2] = RotateLeft(buffer[2] + F(buffer[3], buffer[0], buffer[1]) + m_Block[6], 11);
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buffer[1] = RotateLeft(buffer[1] + F(buffer[2], buffer[3], buffer[0]) + m_Block[7], 19);
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buffer[0] = RotateLeft(buffer[0] + F(buffer[1], buffer[2], buffer[3]) + m_Block[8], 3);
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buffer[3] = RotateLeft(buffer[3] + F(buffer[0], buffer[1], buffer[2]) + m_Block[9], 7);
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buffer[2] = RotateLeft(buffer[2] + F(buffer[3], buffer[0], buffer[1]) + m_Block[10], 11);
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buffer[1] = RotateLeft(buffer[1] + F(buffer[2], buffer[3], buffer[0]) + m_Block[11], 19);
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buffer[0] = RotateLeft(buffer[0] + F(buffer[1], buffer[2], buffer[3]) + m_Block[12], 3);
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buffer[3] = RotateLeft(buffer[3] + F(buffer[0], buffer[1], buffer[2]) + m_Block[13], 7);
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buffer[2] = RotateLeft(buffer[2] + F(buffer[3], buffer[0], buffer[1]) + m_Block[14], 11);
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buffer[1] = RotateLeft(buffer[1] + F(buffer[2], buffer[3], buffer[0]) + m_Block[15], 19);
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/* Round 2 */
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buffer[0] = RotateLeft(buffer[0] + G(buffer[1], buffer[2], buffer[3]) + m_Block[0] + 0x5A827999, 3);
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buffer[3] = RotateLeft(buffer[3] + G(buffer[0], buffer[1], buffer[2]) + m_Block[4] + 0x5A827999, 5);
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buffer[2] = RotateLeft(buffer[2] + G(buffer[3], buffer[0], buffer[1]) + m_Block[8] + 0x5A827999, 9);
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buffer[1] = RotateLeft(buffer[1] + G(buffer[2], buffer[3], buffer[0]) + m_Block[12] + 0x5A827999, 13);
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buffer[0] = RotateLeft(buffer[0] + G(buffer[1], buffer[2], buffer[3]) + m_Block[1] + 0x5A827999, 3);
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buffer[3] = RotateLeft(buffer[3] + G(buffer[0], buffer[1], buffer[2]) + m_Block[5] + 0x5A827999, 5);
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buffer[2] = RotateLeft(buffer[2] + G(buffer[3], buffer[0], buffer[1]) + m_Block[9] + 0x5A827999, 9);
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buffer[1] = RotateLeft(buffer[1] + G(buffer[2], buffer[3], buffer[0]) + m_Block[13] + 0x5A827999, 13);
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buffer[0] = RotateLeft(buffer[0] + G(buffer[1], buffer[2], buffer[3]) + m_Block[2] + 0x5A827999, 3);
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buffer[3] = RotateLeft(buffer[3] + G(buffer[0], buffer[1], buffer[2]) + m_Block[6] + 0x5A827999, 5);
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buffer[2] = RotateLeft(buffer[2] + G(buffer[3], buffer[0], buffer[1]) + m_Block[10] + 0x5A827999, 9);
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buffer[1] = RotateLeft(buffer[1] + G(buffer[2], buffer[3], buffer[0]) + m_Block[14] + 0x5A827999, 13);
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buffer[0] = RotateLeft(buffer[0] + G(buffer[1], buffer[2], buffer[3]) + m_Block[3] + 0x5A827999, 3);
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buffer[3] = RotateLeft(buffer[3] + G(buffer[0], buffer[1], buffer[2]) + m_Block[7] + 0x5A827999, 5);
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buffer[2] = RotateLeft(buffer[2] + G(buffer[3], buffer[0], buffer[1]) + m_Block[11] + 0x5A827999, 9);
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buffer[1] = RotateLeft(buffer[1] + G(buffer[2], buffer[3], buffer[0]) + m_Block[15] + 0x5A827999, 13);
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/* Round 3 */
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buffer[0] = RotateLeft(buffer[0] + H(buffer[1], buffer[2], buffer[3]) + m_Block[0] + 0x6ED9EBA1, 3);
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buffer[3] = RotateLeft(buffer[3] + H(buffer[0], buffer[1], buffer[2]) + m_Block[8] + 0x6ED9EBA1, 9);
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buffer[2] = RotateLeft(buffer[2] + H(buffer[3], buffer[0], buffer[1]) + m_Block[4] + 0x6ED9EBA1, 11);
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buffer[1] = RotateLeft(buffer[1] + H(buffer[2], buffer[3], buffer[0]) + m_Block[12] + 0x6ED9EBA1, 15);
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buffer[0] = RotateLeft(buffer[0] + H(buffer[1], buffer[2], buffer[3]) + m_Block[2] + 0x6ED9EBA1, 3);
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buffer[3] = RotateLeft(buffer[3] + H(buffer[0], buffer[1], buffer[2]) + m_Block[10] + 0x6ED9EBA1, 9);
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buffer[2] = RotateLeft(buffer[2] + H(buffer[3], buffer[0], buffer[1]) + m_Block[6] + 0x6ED9EBA1, 11);
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buffer[1] = RotateLeft(buffer[1] + H(buffer[2], buffer[3], buffer[0]) + m_Block[14] + 0x6ED9EBA1, 15);
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buffer[0] = RotateLeft(buffer[0] + H(buffer[1], buffer[2], buffer[3]) + m_Block[1] + 0x6ED9EBA1, 3);
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buffer[3] = RotateLeft(buffer[3] + H(buffer[0], buffer[1], buffer[2]) + m_Block[9] + 0x6ED9EBA1, 9);
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buffer[2] = RotateLeft(buffer[2] + H(buffer[3], buffer[0], buffer[1]) + m_Block[5] + 0x6ED9EBA1, 11);
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buffer[1] = RotateLeft(buffer[1] + H(buffer[2], buffer[3], buffer[0]) + m_Block[13] + 0x6ED9EBA1, 15);
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buffer[0] = RotateLeft(buffer[0] + H(buffer[1], buffer[2], buffer[3]) + m_Block[3] + 0x6ED9EBA1, 3);
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buffer[3] = RotateLeft(buffer[3] + H(buffer[0], buffer[1], buffer[2]) + m_Block[11] + 0x6ED9EBA1, 9);
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buffer[2] = RotateLeft(buffer[2] + H(buffer[3], buffer[0], buffer[1]) + m_Block[7] + 0x6ED9EBA1, 11);
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buffer[1] = RotateLeft(buffer[1] + H(buffer[2], buffer[3], buffer[0]) + m_Block[15] + 0x6ED9EBA1, 15);
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unchecked
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{
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m_Buffer[0] += buffer[0];
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m_Buffer[1] += buffer[1];
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m_Buffer[2] += buffer[2];
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m_Buffer[3] += buffer[3];
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}
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}
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static uint F(uint x, uint y, uint z)
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{
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// XY v not(X) Z
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return (x & y) | (~x & z);
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}
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static uint G(uint x, uint y, uint z)
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{
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// XY v XZ v YZ
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return (x & y) | (x & z) | (y & z);
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}
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static uint H(uint x, uint y, uint z)
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{
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// X XOR Y XOR Z
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return x ^ y ^ z;
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}
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static uint RotateLeft(uint x, uint n)
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{
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return (x << (int)n) | (x >> (32 - (int)n));
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}
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}
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}
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