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Diffstat (limited to 'Emby.Server.Implementations/IO/SharpCifs/Util/MD4.cs')
| -rw-r--r-- | Emby.Server.Implementations/IO/SharpCifs/Util/MD4.cs | 347 |
1 files changed, 347 insertions, 0 deletions
diff --git a/Emby.Server.Implementations/IO/SharpCifs/Util/MD4.cs b/Emby.Server.Implementations/IO/SharpCifs/Util/MD4.cs new file mode 100644 index 000000000..99eb6ade6 --- /dev/null +++ b/Emby.Server.Implementations/IO/SharpCifs/Util/MD4.cs @@ -0,0 +1,347 @@ +// This code is derived from jcifs smb client library <jcifs at samba dot org> +// Ported by J. Arturo <webmaster at komodosoft dot net> +// +// This library is free software; you can redistribute it and/or +// modify it under the terms of the GNU Lesser General Public +// License as published by the Free Software Foundation; either +// version 2.1 of the License, or (at your option) any later version. +// +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +// Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public +// License along with this library; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +using System; +using SharpCifs.Util.Sharpen; + +namespace SharpCifs.Util +{ + /// <summary>Implements the MD4 message digest algorithm in Java.</summary> + /// <remarks> + /// Implements the MD4 message digest algorithm in Java. + /// <p> + /// <b>References:</b> + /// <ol> + /// <li> Ronald L. Rivest, + /// "<a href="http://www.roxen.com/rfc/rfc1320.html"> + /// The MD4 Message-Digest Algorithm</a>", + /// IETF RFC-1320 (informational). + /// </ol> + /// <p><b>$Revision: 1.2 $</b> + /// </remarks> + /// <author>Raif S. Naffah</author> + public class Md4 : MessageDigest + { + /// <summary>The size in bytes of the input block to the tranformation algorithm.</summary> + /// <remarks>The size in bytes of the input block to the tranformation algorithm.</remarks> + private const int BlockLength = 64; + + /// <summary>4 32-bit words (interim result)</summary> + private int[] _context = new int[4]; + + /// <summary>Number of bytes processed so far mod.</summary> + /// <remarks>Number of bytes processed so far mod. 2 power of 64.</remarks> + private long _count; + + /// <summary>512 bits input buffer = 16 x 32-bit words holds until reaches 512 bits.</summary> + /// <remarks>512 bits input buffer = 16 x 32-bit words holds until reaches 512 bits.</remarks> + private byte[] _buffer = new byte[BlockLength]; + + /// <summary>512 bits work buffer = 16 x 32-bit words</summary> + private int[] _x = new int[16]; + + public Md4() + { + // This file is currently unlocked (change this line if you lock the file) + // + // $Log: MD4.java,v $ + // Revision 1.2 1998/01/05 03:41:19 iang + // Added references only. + // + // Revision 1.1.1.1 1997/11/03 22:36:56 hopwood + // + Imported to CVS (tagged as 'start'). + // + // Revision 0.1.0.0 1997/07/14 R. Naffah + // + original version + // + // $Endlog$ + // MD4 specific object variables + //........................................................................... + // = 512 / 8; + // Constructors + //........................................................................... + EngineReset(); + } + + /// <summary>This constructor is here to implement cloneability of this class.</summary> + /// <remarks>This constructor is here to implement cloneability of this class.</remarks> + private Md4(Md4 md) : this() + { + _context = (int[])md._context.Clone(); + _buffer = (byte[])md._buffer.Clone(); + _count = md._count; + } + + // Cloneable method implementation + //........................................................................... + /// <summary>Returns a copy of this MD object.</summary> + /// <remarks>Returns a copy of this MD object.</remarks> + public object Clone() + { + return new Md4(this); + } + + // JCE methods + //........................................................................... + /// <summary> + /// Resets this object disregarding any temporary data present at the + /// time of the invocation of this call. + /// </summary> + /// <remarks> + /// Resets this object disregarding any temporary data present at the + /// time of the invocation of this call. + /// </remarks> + protected void EngineReset() + { + // initial values of MD4 i.e. A, B, C, D + // as per rfc-1320; they are low-order byte first + _context[0] = unchecked(0x67452301); + _context[1] = unchecked((int)(0xEFCDAB89)); + _context[2] = unchecked((int)(0x98BADCFE)); + _context[3] = unchecked(0x10325476); + _count = 0L; + for (int i = 0; i < BlockLength; i++) + { + _buffer[i] = 0; + } + } + + /// <summary>Continues an MD4 message digest using the input byte.</summary> + /// <remarks>Continues an MD4 message digest using the input byte.</remarks> + protected void EngineUpdate(byte b) + { + // compute number of bytes still unhashed; ie. present in buffer + int i = (int)(_count % BlockLength); + _count++; + // update number of bytes + _buffer[i] = b; + if (i == BlockLength - 1) + { + Transform(_buffer, 0); + } + } + + /// <summary>MD4 block update operation.</summary> + /// <remarks> + /// MD4 block update operation. + /// <p> + /// Continues an MD4 message digest operation, by filling the buffer, + /// transform(ing) data in 512-bit message block(s), updating the variables + /// context and count, and leaving (buffering) the remaining bytes in buffer + /// for the next update or finish. + /// </remarks> + /// <param name="input">input block</param> + /// <param name="offset">start of meaningful bytes in input</param> + /// <param name="len">count of bytes in input block to consider</param> + protected void EngineUpdate(byte[] input, int offset, int len) + { + // make sure we don't exceed input's allocated size/length + if (offset < 0 || len < 0 || (long)offset + len > input.Length) + { + throw new IndexOutOfRangeException(); + } + // compute number of bytes still unhashed; ie. present in buffer + int bufferNdx = (int)(_count % BlockLength); + _count += len; + // update number of bytes + int partLen = BlockLength - bufferNdx; + int i = 0; + if (len >= partLen) + { + Array.Copy(input, offset, _buffer, bufferNdx, partLen); + Transform(_buffer, 0); + for (i = partLen; i + BlockLength - 1 < len; i += BlockLength) + { + Transform(input, offset + i); + } + bufferNdx = 0; + } + // buffer remaining input + if (i < len) + { + Array.Copy(input, offset + i, _buffer, bufferNdx, len - i); + } + } + + /// <summary> + /// Completes the hash computation by performing final operations such + /// as padding. + /// </summary> + /// <remarks> + /// Completes the hash computation by performing final operations such + /// as padding. At the return of this engineDigest, the MD engine is + /// reset. + /// </remarks> + /// <returns>the array of bytes for the resulting hash value.</returns> + protected byte[] EngineDigest() + { + // pad output to 56 mod 64; as RFC1320 puts it: congruent to 448 mod 512 + int bufferNdx = (int)(_count % BlockLength); + int padLen = (bufferNdx < 56) ? (56 - bufferNdx) : (120 - bufferNdx); + // padding is alwas binary 1 followed by binary 0s + byte[] tail = new byte[padLen + 8]; + tail[0] = unchecked(unchecked(0x80)); + // append length before final transform: + // save number of bits, casting the long to an array of 8 bytes + // save low-order byte first. + for (int i = 0; i < 8; i++) + { + tail[padLen + i] = unchecked((byte)((long)(((ulong)(_count * 8)) >> (8 * i)))); + } + EngineUpdate(tail, 0, tail.Length); + byte[] result = new byte[16]; + // cast this MD4's context (array of 4 ints) into an array of 16 bytes. + for (int i1 = 0; i1 < 4; i1++) + { + for (int j = 0; j < 4; j++) + { + result[i1 * 4 + j] = unchecked((byte)((int)(((uint)_context[i1]) >> (8 * j)))); + } + } + // reset the engine + EngineReset(); + return result; + } + + // own methods + //........................................................................... + /// <summary>MD4 basic transformation.</summary> + /// <remarks> + /// MD4 basic transformation. + /// <p> + /// Transforms context based on 512 bits from input block starting + /// from the offset'th byte. + /// </remarks> + /// <param name="block">input sub-array.</param> + /// <param name="offset">starting position of sub-array.</param> + private void Transform(byte[] block, int offset) + { + // encodes 64 bytes from input block into an array of 16 32-bit + // entities. Use A as a temp var. + for (int i = 0; i < 16; i++) + { + _x[i] = (block[offset++] & unchecked(0xFF)) | (block[offset++] & unchecked( + 0xFF)) << 8 | (block[offset++] & unchecked(0xFF)) << 16 | (block[offset + ++] & unchecked(0xFF)) << 24; + } + int a = _context[0]; + int b = _context[1]; + int c = _context[2]; + int d = _context[3]; + a = Ff(a, b, c, d, _x[0], 3); + d = Ff(d, a, b, c, _x[1], 7); + c = Ff(c, d, a, b, _x[2], 11); + b = Ff(b, c, d, a, _x[3], 19); + a = Ff(a, b, c, d, _x[4], 3); + d = Ff(d, a, b, c, _x[5], 7); + c = Ff(c, d, a, b, _x[6], 11); + b = Ff(b, c, d, a, _x[7], 19); + a = Ff(a, b, c, d, _x[8], 3); + d = Ff(d, a, b, c, _x[9], 7); + c = Ff(c, d, a, b, _x[10], 11); + b = Ff(b, c, d, a, _x[11], 19); + a = Ff(a, b, c, d, _x[12], 3); + d = Ff(d, a, b, c, _x[13], 7); + c = Ff(c, d, a, b, _x[14], 11); + b = Ff(b, c, d, a, _x[15], 19); + a = Gg(a, b, c, d, _x[0], 3); + d = Gg(d, a, b, c, _x[4], 5); + c = Gg(c, d, a, b, _x[8], 9); + b = Gg(b, c, d, a, _x[12], 13); + a = Gg(a, b, c, d, _x[1], 3); + d = Gg(d, a, b, c, _x[5], 5); + c = Gg(c, d, a, b, _x[9], 9); + b = Gg(b, c, d, a, _x[13], 13); + a = Gg(a, b, c, d, _x[2], 3); + d = Gg(d, a, b, c, _x[6], 5); + c = Gg(c, d, a, b, _x[10], 9); + b = Gg(b, c, d, a, _x[14], 13); + a = Gg(a, b, c, d, _x[3], 3); + d = Gg(d, a, b, c, _x[7], 5); + c = Gg(c, d, a, b, _x[11], 9); + b = Gg(b, c, d, a, _x[15], 13); + a = Hh(a, b, c, d, _x[0], 3); + d = Hh(d, a, b, c, _x[8], 9); + c = Hh(c, d, a, b, _x[4], 11); + b = Hh(b, c, d, a, _x[12], 15); + a = Hh(a, b, c, d, _x[2], 3); + d = Hh(d, a, b, c, _x[10], 9); + c = Hh(c, d, a, b, _x[6], 11); + b = Hh(b, c, d, a, _x[14], 15); + a = Hh(a, b, c, d, _x[1], 3); + d = Hh(d, a, b, c, _x[9], 9); + c = Hh(c, d, a, b, _x[5], 11); + b = Hh(b, c, d, a, _x[13], 15); + a = Hh(a, b, c, d, _x[3], 3); + d = Hh(d, a, b, c, _x[11], 9); + c = Hh(c, d, a, b, _x[7], 11); + b = Hh(b, c, d, a, _x[15], 15); + _context[0] += a; + _context[1] += b; + _context[2] += c; + _context[3] += d; + } + + // The basic MD4 atomic functions. + private int Ff(int a, int b, int c, int d, int x, int s) + { + int t = a + ((b & c) | (~b & d)) + x; + return t << s | (int)(((uint)t) >> (32 - s)); + } + + private int Gg(int a, int b, int c, int d, int x, int s) + { + int t = a + ((b & (c | d)) | (c & d)) + x + unchecked(0x5A827999); + return t << s | (int)(((uint)t) >> (32 - s)); + } + + private int Hh(int a, int b, int c, int d, int x, int s) + { + int t = a + (b ^ c ^ d) + x + unchecked(0x6ED9EBA1); + return t << s | (int)(((uint)t) >> (32 - s)); + } + + public override byte[] Digest() + { + return EngineDigest(); + } + + public override int GetDigestLength() + { + return EngineDigest().Length; + } + + public override void Reset() + { + EngineReset(); + } + + public override void Update(byte[] b) + { + EngineUpdate(b, 0, b.Length); + } + + public override void Update(byte b) + { + EngineUpdate(b); + } + + public override void Update(byte[] b, int offset, int len) + { + EngineUpdate(b, offset, len); + } + } +} |