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146 lines
3.7 KiB
C#
146 lines
3.7 KiB
C#
// This code is derived from jcifs smb client library <jcifs at samba dot org>
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// Ported by J. Arturo <webmaster at komodosoft dot net>
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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using System;
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using SharpCifs.Util.Sharpen;
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namespace SharpCifs.Util
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{
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/// <summary>This is an implementation of the HMACT64 keyed hashing algorithm.</summary>
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/// <remarks>
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/// This is an implementation of the HMACT64 keyed hashing algorithm.
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/// HMACT64 is defined by Luke Leighton as a modified HMAC-MD5 (RFC 2104)
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/// in which the key is truncated at 64 bytes (rather than being hashed
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/// via MD5).
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/// </remarks>
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public class Hmact64 : MessageDigest
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{
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private const int BlockLength = 64;
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private const byte Ipad = unchecked(unchecked(0x36));
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private const byte Opad = unchecked(unchecked(0x5c));
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private MessageDigest _md5;
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private byte[] _ipad = new byte[BlockLength];
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private byte[] _opad = new byte[BlockLength];
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/// <summary>Creates an HMACT64 instance which uses the given secret key material.</summary>
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/// <remarks>Creates an HMACT64 instance which uses the given secret key material.</remarks>
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/// <param name="key">The key material to use in hashing.</param>
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public Hmact64(byte[] key)
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{
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int length = Math.Min(key.Length, BlockLength);
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for (int i = 0; i < length; i++)
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{
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_ipad[i] = unchecked((byte)(key[i] ^ Ipad));
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_opad[i] = unchecked((byte)(key[i] ^ Opad));
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}
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for (int i1 = length; i1 < BlockLength; i1++)
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{
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_ipad[i1] = Ipad;
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_opad[i1] = Opad;
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}
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try
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{
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_md5 = GetInstance("MD5");
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}
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catch (Exception ex)
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{
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throw new InvalidOperationException(ex.Message);
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}
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EngineReset();
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}
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protected byte[] EngineDigest()
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{
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byte[] digest = _md5.Digest();
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_md5.Update(_opad);
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return _md5.Digest(digest);
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}
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protected int EngineDigest(byte[] buf, int offset, int len)
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{
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byte[] digest = _md5.Digest();
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_md5.Update(_opad);
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_md5.Update(digest);
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try
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{
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_md5.Digest(buf, offset, len);
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return len;
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}
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catch (Exception)
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{
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throw new InvalidOperationException();
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}
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}
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protected int EngineGetDigestLength()
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{
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return _md5.GetDigestLength();
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}
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protected void EngineReset()
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{
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_md5.Reset();
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_md5.Update(_ipad);
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}
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protected void EngineUpdate(byte b)
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{
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_md5.Update(b);
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}
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protected void EngineUpdate(byte[] input, int offset, int len)
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{
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_md5.Update(input, offset, len);
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}
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public override byte[] Digest()
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{
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return EngineDigest();
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}
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public override int GetDigestLength()
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{
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return EngineGetDigestLength();
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}
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public override void Reset()
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{
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EngineReset();
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}
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public override void Update(byte[] b)
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{
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EngineUpdate(b, 0, b.Length);
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}
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public override void Update(byte b)
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{
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EngineUpdate(b);
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}
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public override void Update(byte[] b, int offset, int len)
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{
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EngineUpdate(b, offset, len);
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}
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}
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}
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