MD5Core 和 MD5_Client

2017-02-20 00:25:59  访问(1713) 赞(0) 踩(0)

• 内容
• MD5_Client

• using System;
  using System.Collections.Generic;
  using System.Text;
  
  namespace SlowX.Functions.Tmps
  {
  // Simple struct for the (a,b,c,d) which is used to compute the mesage digest.
  struct ABCDStruct
  {
  public uint A;
  public uint B;
  public uint C;
  public uint D;
  }
  
  public class MD5Core
  {//Prevent CSC from adding a default public constructor
  private MD5Core() { }
  
  public static byte[] GetHash(string input, Encoding encoding)
  {
  if (null == input)
  throw new System.ArgumentNullException("input", "Unable to calculate hash over null input data");
  if (null == encoding)
  throw new System.ArgumentNullException("encoding", "Unable to calculate hash over a string without a default encoding. Consider using the GetHash(string) overload to use UTF8 Encoding");
  
  byte[] target = encoding.GetBytes(input);
  
  return GetHash(target);
  }
  
  public static byte[] GetHash(string input)
  {
  return GetHash(input, new UTF8Encoding());
  }
  
  public static string GetHashString(byte[] input)
  {
  if (null == input)
  throw new System.ArgumentNullException("input", "Unable to calculate hash over null input data");
  
  string retval = BitConverter.ToString(GetHash(input));
  retval = retval.Replace("-", "");
  
  return retval;
  }
  
  public static string GetHashString(string input, Encoding encoding)
  {
  if (null == input)
  throw new System.ArgumentNullException("input", "Unable to calculate hash over null input data");
  if (null == encoding)
  throw new System.ArgumentNullException("encoding", "Unable to calculate hash over a string without a default encoding. Consider using the GetHashString(string) overload to use UTF8 Encoding");
  
  byte[] target = encoding.GetBytes(input);
  
  return GetHashString(target);
  }
  
  public static string GetHashString(string input)
  {
  return GetHashString(input, new UTF8Encoding());
  }
  
  public static byte[] GetHash(byte[] input)
  {
  if (null == input)
  throw new System.ArgumentNullException("input", "Unable to calculate hash over null input data");
  
  //Intitial values defined in RFC 1321
  ABCDStruct abcd = new ABCDStruct();
  abcd.A = 0x67452301;
  abcd.B = 0xefcdab89;
  abcd.C = 0x98badcfe;
  abcd.D = 0x10325476;
  
  //We pass in the input array by block, the final block of data must be handled specialy for padding & length embeding
  int startIndex = 0;
  while (startIndex <= input.Length - 64)
  {
  MD5Core.GetHashBlock(input, ref abcd, startIndex);
  startIndex += 64;
  }
  // The final data block.
  return MD5Core.GetHashFinalBlock(input, startIndex, input.Length - startIndex, abcd, (Int64)input.Length * 8);
  }
  
  internal static byte[] GetHashFinalBlock(byte[] input, int ibStart, int cbSize, ABCDStruct ABCD, Int64 len)
  {
  byte[] working = new byte[64];
  byte[] length = BitConverter.GetBytes(len);
  
  //Padding is a single bit 1, followed by the number of 0s required to make size congruent to 448 modulo 512. Step 1 of RFC 1321
  //The CLR ensures that our buffer is 0-assigned, we don't need to explicitly set it. This is why it ends up being quicker to just
  //use a temporary array rather then doing in-place assignment (5% for small inputs)
  Array.Copy(input, ibStart, working, 0, cbSize);
  working[cbSize] = 0x80;
  
  //We have enough room to store the length in this chunk
  if (cbSize <= 56)
  {
  Array.Copy(length, 0, working, 56, 8);
  GetHashBlock(working, ref ABCD, 0);
  }
  else //We need an aditional chunk to store the length
  {
  GetHashBlock(working, ref ABCD, 0);
  //Create an entirely new chunk due to the 0-assigned trick mentioned above, to avoid an extra function call clearing the array
  working = new byte[64];
  Array.Copy(length, 0, working, 56, 8);
  GetHashBlock(working, ref ABCD, 0);
  }
  byte[] output = new byte[16];
  Array.Copy(BitConverter.GetBytes(ABCD.A), 0, output, 0, 4);
  Array.Copy(BitConverter.GetBytes(ABCD.B), 0, output, 4, 4);
  Array.Copy(BitConverter.GetBytes(ABCD.C), 0, output, 8, 4);
  Array.Copy(BitConverter.GetBytes(ABCD.D), 0, output, 12, 4);
  return output;
  }
  
  // Performs a single block transform of MD5 for a given set of ABCD inputs
  /* If implementing your own hashing framework, be sure to set the initial ABCD correctly according to RFC 1321:
  // A = 0x67452301;
  // B = 0xefcdab89;
  // C = 0x98badcfe;
  // D = 0x10325476;
  */
  internal static void GetHashBlock(byte[] input, ref ABCDStruct ABCDValue, int ibStart)
  {
  uint[] temp = Converter(input, ibStart);
  uint a = ABCDValue.A;
  uint b = ABCDValue.B;
  uint c = ABCDValue.C;
  uint d = ABCDValue.D;
  
  a = r1(a, b, c, d, temp[0], 7, 0xd76aa478);
  d = r1(d, a, b, c, temp[1], 12, 0xe8c7b756);
  c = r1(c, d, a, b, temp[2], 17, 0x242070db);
  b = r1(b, c, d, a, temp[3], 22, 0xc1bdceee);
  a = r1(a, b, c, d, temp[4], 7, 0xf57c0faf);
  d = r1(d, a, b, c, temp[5], 12, 0x4787c62a);
  c = r1(c, d, a, b, temp[6], 17, 0xa8304613);
  b = r1(b, c, d, a, temp[7], 22, 0xfd469501);
  a = r1(a, b, c, d, temp[8], 7, 0x698098d8);
  d = r1(d, a, b, c, temp[9], 12, 0x8b44f7af);
  c = r1(c, d, a, b, temp[10], 17, 0xffff5bb1);
  b = r1(b, c, d, a, temp[11], 22, 0x895cd7be);
  a = r1(a, b, c, d, temp[12], 7, 0x6b901122);
  d = r1(d, a, b, c, temp[13], 12, 0xfd987193);
  c = r1(c, d, a, b, temp[14], 17, 0xa679438e);
  b = r1(b, c, d, a, temp[15], 22, 0x49b40821);
  
  a = r2(a, b, c, d, temp[1], 5, 0xf61e2562);
  d = r2(d, a, b, c, temp[6], 9, 0xc040b340);
  c = r2(c, d, a, b, temp[11], 14, 0x265e5a51);
  b = r2(b, c, d, a, temp[0], 20, 0xe9b6c7aa);
  a = r2(a, b, c, d, temp[5], 5, 0xd62f105d);
  d = r2(d, a, b, c, temp[10], 9, 0x02441453);
  c = r2(c, d, a, b, temp[15], 14, 0xd8a1e681);
  b = r2(b, c, d, a, temp[4], 20, 0xe7d3fbc8);
  a = r2(a, b, c, d, temp[9], 5, 0x21e1cde6);
  d = r2(d, a, b, c, temp[14], 9, 0xc33707d6);
  c = r2(c, d, a, b, temp[3], 14, 0xf4d50d87);
  b = r2(b, c, d, a, temp[8], 20, 0x455a14ed);
  a = r2(a, b, c, d, temp[13], 5, 0xa9e3e905);
  d = r2(d, a, b, c, temp[2], 9, 0xfcefa3f8);
  c = r2(c, d, a, b, temp[7], 14, 0x676f02d9);
  b = r2(b, c, d, a, temp[12], 20, 0x8d2a4c8a);
  
  a = r3(a, b, c, d, temp[5], 4, 0xfffa3942);
  d = r3(d, a, b, c, temp[8], 11, 0x8771f681);
  c = r3(c, d, a, b, temp[11], 16, 0x6d9d6122);
  b = r3(b, c, d, a, temp[14], 23, 0xfde5380c);
  a = r3(a, b, c, d, temp[1], 4, 0xa4beea44);
  d = r3(d, a, b, c, temp[4], 11, 0x4bdecfa9);
  c = r3(c, d, a, b, temp[7], 16, 0xf6bb4b60);
  b = r3(b, c, d, a, temp[10], 23, 0xbebfbc70);
  a = r3(a, b, c, d, temp[13], 4, 0x289b7ec6);
  d = r3(d, a, b, c, temp[0], 11, 0xeaa127fa);
  c = r3(c, d, a, b, temp[3], 16, 0xd4ef3085);
  b = r3(b, c, d, a, temp[6], 23, 0x04881d05);
  a = r3(a, b, c, d, temp[9], 4, 0xd9d4d039);
  d = r3(d, a, b, c, temp[12], 11, 0xe6db99e5);
  c = r3(c, d, a, b, temp[15], 16, 0x1fa27cf8);
  b = r3(b, c, d, a, temp[2], 23, 0xc4ac5665);
  
  a = r4(a, b, c, d, temp[0], 6, 0xf4292244);
  d = r4(d, a, b, c, temp[7], 10, 0x432aff97);
  c = r4(c, d, a, b, temp[14], 15, 0xab9423a7);
  b = r4(b, c, d, a, temp[5], 21, 0xfc93a039);
  a = r4(a, b, c, d, temp[12], 6, 0x655b59c3);
  d = r4(d, a, b, c, temp[3], 10, 0x8f0ccc92);
  c = r4(c, d, a, b, temp[10], 15, 0xffeff47d);
  b = r4(b, c, d, a, temp[1], 21, 0x85845dd1);
  a = r4(a, b, c, d, temp[8], 6, 0x6fa87e4f);
  d = r4(d, a, b, c, temp[15], 10, 0xfe2ce6e0);
  c = r4(c, d, a, b, temp[6], 15, 0xa3014314);
  b = r4(b, c, d, a, temp[13], 21, 0x4e0811a1);
  a = r4(a, b, c, d, temp[4], 6, 0xf7537e82);
  d = r4(d, a, b, c, temp[11], 10, 0xbd3af235);
  c = r4(c, d, a, b, temp[2], 15, 0x2ad7d2bb);
  b = r4(b, c, d, a, temp[9], 21, 0xeb86d391);
  
  ABCDValue.A = unchecked(a + ABCDValue.A);
  ABCDValue.B = unchecked(b + ABCDValue.B);
  ABCDValue.C = unchecked(c + ABCDValue.C);
  ABCDValue.D = unchecked(d + ABCDValue.D);
  return;
  }
  
  //Manually unrolling these equations nets us a 20% performance improvement
  private static uint r1(uint a, uint b, uint c, uint d, uint x, int s, uint t)
  {
  // (b + LSR((a + F(b, c, d) + x + t), s))
  //F(x, y, z) ((x & y) | ((x ^ 0xFFFFFFFF) & z))
  return unchecked(b + LSR((a + ((b & c) | ((b ^ 0xFFFFFFFF) & d)) + x + t), s));
  }
  
  private static uint r2(uint a, uint b, uint c, uint d, uint x, int s, uint t)
  {
  // (b + LSR((a + G(b, c, d) + x + t), s))
  //G(x, y, z) ((x & z) | (y & (z ^ 0xFFFFFFFF)))
  return unchecked(b + LSR((a + ((b & d) | (c & (d ^ 0xFFFFFFFF))) + x + t), s));
  }
  
  private static uint r3(uint a, uint b, uint c, uint d, uint x, int s, uint t)
  {
  // (b + LSR((a + H(b, c, d) + k + i), s))
  //H(x, y, z) (x ^ y ^ z)
  return unchecked(b + LSR((a + (b ^ c ^ d) + x + t), s));
  }
  
  private static uint r4(uint a, uint b, uint c, uint d, uint x, int s, uint t)
  {
  // (b + LSR((a + I(b, c, d) + k + i), s))
  //I(x, y, z) (y ^ (x | (z ^ 0xFFFFFFFF)))
  return unchecked(b + LSR((a + (c ^ (b | (d ^ 0xFFFFFFFF))) + x + t), s));
  }
  
  // Implementation of left rotate
  // s is an int instead of a uint becuase the CLR requires the argument passed to >>/<< is of
  // type int. Doing the demoting inside this function would add overhead.
  private static uint LSR(uint i, int s)
  {
  return ((i << s) | (i >> (32 - s)));
  }
  
  //Convert input array into array of UInts
  private static uint[] Converter(byte[] input, int ibStart)
  {
  if (null == input)
  throw new System.ArgumentNullException("input", "Unable convert null array to array of uInts");
  
  uint[] result = new uint[16];
  
  for (int i = 0; i < 16; i++)
  {
  result[i] = (uint)input[ibStart + i * 4];
  result[i] += (uint)input[ibStart + i * 4 + 1] << 8;
  result[i] += (uint)input[ibStart + i * 4 + 2] << 16;
  result[i] += (uint)input[ibStart + i * 4 + 3] << 24;
  }
  
  return result;
  }
  }
  
  
  }

• using System;
  using System.Collections.Generic;
  using System.IO;
  using System.Text;
  
  namespace SlowX.Functions.Tmps
  {
  public class MD5_Client : IDisposable
  {
  static public MD5_Client Create(string hashName)
  {
  if (hashName == "MD5_Client")
  return new MD5_Client();
  else
  throw new NotSupportedException();
  }
  
  static public String GetMd5String(String source)
  {
  MD5_Client md = Create();
  byte[] hash;
  
  //Create a new instance of ASCIIEncoding to
  //convert the string into an array of Unicode bytes.
  UTF8Encoding enc = new UTF8Encoding();
  // ASCIIEncoding enc = new ASCIIEncoding();
  
  //Convert the string into an array of bytes.
  byte[] buffer = enc.GetBytes(source);
  
  //Create the hash value from the array of bytes.
  hash = md.ComputeHash(buffer);
  
  StringBuilder sb = new StringBuilder();
  foreach (byte b in hash)
  sb.Append(b.ToString("x2"));
  return sb.ToString();
  }
  
  static public MD5_Client Create()
  {
  return new MD5_Client();
  }
  
  #region base implementation of the MD5_Client
  #region constants
  private const byte S11 = 7;
  private const byte S12 = 12;
  private const byte S13 = 17;
  private const byte S14 = 22;
  private const byte S21 = 5;
  private const byte S22 = 9;
  private const byte S23 = 14;
  private const byte S24 = 20;
  private const byte S31 = 4;
  private const byte S32 = 11;
  private const byte S33 = 16;
  private const byte S34 = 23;
  private const byte S41 = 6;
  private const byte S42 = 10;
  private const byte S43 = 15;
  private const byte S44 = 21;
  static private byte[] PADDING = new byte[] {
  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
  };
  #endregion
  
  #region F, G, H and I are basic MD5_Client functions.
  static private uint F(uint x, uint y, uint z)
  {
  return (((x) & (y)) | ((~x) & (z)));
  }
  static private uint G(uint x, uint y, uint z)
  {
  return (((x) & (z)) | ((y) & (~z)));
  }
  static private uint H(uint x, uint y, uint z)
  {
  return ((x) ^ (y) ^ (z));
  }
  static private uint I(uint x, uint y, uint z)
  {
  return ((y) ^ ((x) | (~z)));
  }
  #endregion
  
  #region rotates x left n bits.
  /// <summary>
  /// rotates x left n bits.
  /// </summary>
  /// <param name="x"></param>
  /// <param name="n"></param>
  /// <returns></returns>
  static private uint ROTATE_LEFT(uint x, byte n)
  {
  return (((x) << (n)) | ((x) >> (32 - (n))));
  }
  #endregion
  
  #region FF, GG, HH, and II transformations
  /// FF, GG, HH, and II transformations
  /// for rounds 1, 2, 3, and 4.
  /// Rotation is separate from addition to prevent recomputation.
  static private void FF(ref uint a, uint b, uint c, uint d, uint x, byte s, uint ac)
  {
  (a) += F((b), (c), (d)) + (x) + (uint)(ac);
  (a) = ROTATE_LEFT((a), (s));
  (a) += (b);
  }
  static private void GG(ref uint a, uint b, uint c, uint d, uint x, byte s, uint ac)
  {
  (a) += G((b), (c), (d)) + (x) + (uint)(ac);
  (a) = ROTATE_LEFT((a), (s));
  (a) += (b);
  }
  static private void HH(ref uint a, uint b, uint c, uint d, uint x, byte s, uint ac)
  {
  (a) += H((b), (c), (d)) + (x) + (uint)(ac);
  (a) = ROTATE_LEFT((a), (s));
  (a) += (b);
  }
  static private void II(ref uint a, uint b, uint c, uint d, uint x, byte s, uint ac)
  {
  (a) += I((b), (c), (d)) + (x) + (uint)(ac);
  (a) = ROTATE_LEFT((a), (s));
  (a) += (b);
  }
  #endregion
  
  #region context info
  /// <summary>
  /// state (ABCD)
  /// </summary>
  uint[] state = new uint[4];
  
  /// <summary>
  /// number of bits, modulo 2^64 (lsb first)
  /// </summary>
  uint[] count = new uint[2];
  
  /// <summary>
  /// input buffer
  /// </summary>
  byte[] buffer = new byte[64];
  #endregion
  
  internal MD5_Client()
  {
  Initialize();
  }
  
  /// <summary>
  /// MD5_Client initialization. Begins an MD5_Client operation, writing a new context.
  /// </summary>
  /// <remarks>
  /// The RFC named it "MD5_ClientInit"
  /// </remarks>
  public virtual void Initialize()
  {
  count[0] = count[1] = 0;
  
  // Load magic initialization constants.
  state[0] = 0x67452301;
  state[1] = 0xefcdab89;
  state[2] = 0x98badcfe;
  state[3] = 0x10325476;
  }
  
  /// <summary>
  /// MD5_Client block update operation. Continues an MD5_Client message-digest
  /// operation, processing another message block, and updating the
  /// context.
  /// </summary>
  /// <param name="input"></param>
  /// <param name="offset"></param>
  /// <param name="count"></param>
  /// <remarks>The RFC Named it MD5_ClientUpdate</remarks>
  protected virtual void HashCore(byte[] input, int offset, int count)
  {
  int i;
  int index;
  int partLen;
  
  // Compute number of bytes mod 64
  index = (int)((this.count[0] >> 3) & 0x3F);
  
  // Update number of bits
  if ((this.count[0] += (uint)((uint)count << 3)) < ((uint)count << 3))
  this.count[1]++;
  this.count[1] += ((uint)count >> 29);
  
  partLen = 64 - index;
  
  // Transform as many times as possible.
  if (count >= partLen)
  {
  Buffer.BlockCopy(input, offset, this.buffer, index, partLen);
  Transform(this.buffer, 0);
  
  for (i = partLen; i + 63 < count; i += 64)
  Transform(input, offset + i);
  
  index = 0;
  }
  else
  i = 0;
  
  // Buffer remaining input
  Buffer.BlockCopy(input, offset + i, this.buffer, index, count - i);
  }
  
  /// <summary>
  /// MD5_Client finalization. Ends an MD5_Client message-digest operation, writing the
  /// the message digest and zeroizing the context.
  /// </summary>
  /// <returns>message digest</returns>
  /// <remarks>The RFC named it MD5_ClientFinal</remarks>
  protected virtual byte[] HashFinal()
  {
  byte[] digest = new byte[16];
  byte[] bits = new byte[8];
  int index, padLen;
  
  // Save number of bits
  Encode(bits, 0, this.count, 0, 8);
  
  // Pad out to 56 mod 64.
  index = (int)((uint)(this.count[0] >> 3) & 0x3f);
  padLen = (index < 56) ? (56 - index) : (120 - index);
  HashCore(PADDING, 0, padLen);
  
  // Append length (before padding)
  HashCore(bits, 0, 8);
  
  // Store state in digest
  Encode(digest, 0, state, 0, 16);
  
  // Zeroize sensitive information.
  count[0] = count[1] = 0;
  state[0] = 0;
  state[1] = 0;
  state[2] = 0;
  state[3] = 0;
  
  // initialize again, to be ready to use
  Initialize();
  
  return digest;
  }
  
  /// <summary>
  /// MD5_Client basic transformation. Transforms state based on 64 bytes block.
  /// </summary>
  /// <param name="block"></param>
  /// <param name="offset"></param>
  private void Transform(byte[] block, int offset)
  {
  uint a = state[0], b = state[1], c = state[2], d = state[3];
  uint[] x = new uint[16];
  Decode(x, 0, block, offset, 64);
  
  // Round 1
  FF(ref a, b, c, d, x[0], S11, 0xd76aa478); /* 1 */
  FF(ref d, a, b, c, x[1], S12, 0xe8c7b756); /* 2 */
  FF(ref c, d, a, b, x[2], S13, 0x242070db); /* 3 */
  FF(ref b, c, d, a, x[3], S14, 0xc1bdceee); /* 4 */
  FF(ref a, b, c, d, x[4], S11, 0xf57c0faf); /* 5 */
  FF(ref d, a, b, c, x[5], S12, 0x4787c62a); /* 6 */
  FF(ref c, d, a, b, x[6], S13, 0xa8304613); /* 7 */
  FF(ref b, c, d, a, x[7], S14, 0xfd469501); /* 8 */
  FF(ref a, b, c, d, x[8], S11, 0x698098d8); /* 9 */
  FF(ref d, a, b, c, x[9], S12, 0x8b44f7af); /* 10 */
  FF(ref c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
  FF(ref b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
  FF(ref a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
  FF(ref d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
  FF(ref c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
  FF(ref b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
  
  // Round 2
  GG(ref a, b, c, d, x[1], S21, 0xf61e2562); /* 17 */
  GG(ref d, a, b, c, x[6], S22, 0xc040b340); /* 18 */
  GG(ref c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
  GG(ref b, c, d, a, x[0], S24, 0xe9b6c7aa); /* 20 */
  GG(ref a, b, c, d, x[5], S21, 0xd62f105d); /* 21 */
  GG(ref d, a, b, c, x[10], S22, 0x2441453); /* 22 */
  GG(ref c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
  GG(ref b, c, d, a, x[4], S24, 0xe7d3fbc8); /* 24 */
  GG(ref a, b, c, d, x[9], S21, 0x21e1cde6); /* 25 */
  GG(ref d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
  GG(ref c, d, a, b, x[3], S23, 0xf4d50d87); /* 27 */
  GG(ref b, c, d, a, x[8], S24, 0x455a14ed); /* 28 */
  GG(ref a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
  GG(ref d, a, b, c, x[2], S22, 0xfcefa3f8); /* 30 */
  GG(ref c, d, a, b, x[7], S23, 0x676f02d9); /* 31 */
  GG(ref b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
  
  // Round 3
  HH(ref a, b, c, d, x[5], S31, 0xfffa3942); /* 33 */
  HH(ref d, a, b, c, x[8], S32, 0x8771f681); /* 34 */
  HH(ref c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
  HH(ref b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
  HH(ref a, b, c, d, x[1], S31, 0xa4beea44); /* 37 */
  HH(ref d, a, b, c, x[4], S32, 0x4bdecfa9); /* 38 */
  HH(ref c, d, a, b, x[7], S33, 0xf6bb4b60); /* 39 */
  HH(ref b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
  HH(ref a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
  HH(ref d, a, b, c, x[0], S32, 0xeaa127fa); /* 42 */
  HH(ref c, d, a, b, x[3], S33, 0xd4ef3085); /* 43 */
  HH(ref b, c, d, a, x[6], S34, 0x4881d05); /* 44 */
  HH(ref a, b, c, d, x[9], S31, 0xd9d4d039); /* 45 */
  HH(ref d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
  HH(ref c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
  HH(ref b, c, d, a, x[2], S34, 0xc4ac5665); /* 48 */
  
  // Round 4
  II(ref a, b, c, d, x[0], S41, 0xf4292244); /* 49 */
  II(ref d, a, b, c, x[7], S42, 0x432aff97); /* 50 */
  II(ref c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
  II(ref b, c, d, a, x[5], S44, 0xfc93a039); /* 52 */
  II(ref a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
  II(ref d, a, b, c, x[3], S42, 0x8f0ccc92); /* 54 */
  II(ref c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
  II(ref b, c, d, a, x[1], S44, 0x85845dd1); /* 56 */
  II(ref a, b, c, d, x[8], S41, 0x6fa87e4f); /* 57 */
  II(ref d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
  II(ref c, d, a, b, x[6], S43, 0xa3014314); /* 59 */
  II(ref b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
  II(ref a, b, c, d, x[4], S41, 0xf7537e82); /* 61 */
  II(ref d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
  II(ref c, d, a, b, x[2], S43, 0x2ad7d2bb); /* 63 */
  II(ref b, c, d, a, x[9], S44, 0xeb86d391); /* 64 */
  
  state[0] += a;
  state[1] += b;
  state[2] += c;
  state[3] += d;
  
  // Zeroize sensitive information.
  for (int i = 0; i < x.Length; i++)
  x[i] = 0;
  }
  
  /// <summary>
  /// Encodes input (uint) into output (byte). Assumes len is
  /// multiple of 4.
  /// </summary>
  /// <param name="output"></param>
  /// <param name="outputOffset"></param>
  /// <param name="input"></param>
  /// <param name="inputOffset"></param>
  /// <param name="count"></param>
  private static void Encode(byte[] output, int outputOffset, uint[] input, int inputOffset, int count)
  {
  int i, j;
  int end = outputOffset + count;
  for (i = inputOffset, j = outputOffset; j < end; i++, j += 4)
  {
  output[j] = (byte)(input[i] & 0xff);
  output[j + 1] = (byte)((input[i] >> 8) & 0xff);
  output[j + 2] = (byte)((input[i] >> 16) & 0xff);
  output[j + 3] = (byte)((input[i] >> 24) & 0xff);
  }
  }
  
  /// <summary>
  /// Decodes input (byte) into output (uint). Assumes len is
  /// a multiple of 4.
  /// </summary>
  /// <param name="output"></param>
  /// <param name="outputOffset"></param>
  /// <param name="input"></param>
  /// <param name="inputOffset"></param>
  /// <param name="count"></param>
  static private void Decode(uint[] output, int outputOffset, byte[] input, int inputOffset, int count)
  {
  int i, j;
  int end = inputOffset + count;
  for (i = outputOffset, j = inputOffset; j < end; i++, j += 4)
  output[i] = ((uint)input[j]) | (((uint)input[j + 1]) << 8) | (((uint)input[j + 2]) << 16) | (((uint)input[j + 3]) <<
  24);
  }
  #endregion
  
  #region expose the same interface as the regular MD5_Client object
  
  protected byte[] HashValue;
  protected int State;
  public virtual bool CanReuseTransform
  {
  get
  {
  return true;
  }
  }
  
  public virtual bool CanTransformMultipleBlocks
  {
  get
  {
  return true;
  }
  }
  public virtual byte[] Hash
  {
  get
  {
  if (this.State != 0)
  throw new InvalidOperationException();
  return (byte[])HashValue.Clone();
  }
  }
  public virtual int HashSize
  {
  get
  {
  return HashSizeValue;
  }
  }
  protected int HashSizeValue = 128;
  
  public virtual int InputBlockSize
  {
  get
  {
  return 1;
  }
  }
  public virtual int OutputBlockSize
  {
  get
  {
  return 1;
  }
  }
  
  public void Clear()
  {
  Dispose(true);
  }
  
  public byte[] ComputeHash(byte[] buffer)
  {
  return ComputeHash(buffer, 0, buffer.Length);
  }
  public byte[] ComputeHash(byte[] buffer, int offset, int count)
  {
  Initialize();
  HashCore(buffer, offset, count);
  HashValue = HashFinal();
  return (byte[])HashValue.Clone();
  }
  
  public byte[] ComputeHash(Stream inputStream)
  {
  Initialize();
  int count = 0;
  byte[] buffer = new byte[4096];
  while (0 < (count = inputStream.Read(buffer, 0, 4096)))
  {
  HashCore(buffer, 0, count);
  }
  HashValue = HashFinal();
  return (byte[])HashValue.Clone();
  }
  
  public int TransformBlock(
  byte[] inputBuffer,
  int inputOffset,
  int inputCount,
  byte[] outputBuffer,
  int outputOffset
  )
  {
  if (inputBuffer == null)
  {
  throw new ArgumentNullException("inputBuffer");
  }
  if (inputOffset < 0)
  {
  throw new ArgumentOutOfRangeException("inputOffset");
  }
  if ((inputCount < 0) || (inputCount > inputBuffer.Length))
  {
  throw new ArgumentException("inputCount");
  }
  if ((inputBuffer.Length - inputCount) < inputOffset)
  {
  throw new ArgumentOutOfRangeException("inputOffset");
  }
  if (this.State == 0)
  {
  Initialize();
  this.State = 1;
  }
  
  HashCore(inputBuffer, inputOffset, inputCount);
  if ((inputBuffer != outputBuffer) || (inputOffset != outputOffset))
  {
  Buffer.BlockCopy(inputBuffer, inputOffset, outputBuffer, outputOffset, inputCount);
  }
  return inputCount;
  }
  public byte[] TransformFinalBlock(
  byte[] inputBuffer,
  int inputOffset,
  int inputCount
  )
  {
  if (inputBuffer == null)
  {
  throw new ArgumentNullException("inputBuffer");
  }
  if (inputOffset < 0)
  {
  throw new ArgumentOutOfRangeException("inputOffset");
  }
  if ((inputCount < 0) || (inputCount > inputBuffer.Length))
  {
  throw new ArgumentException("inputCount");
  }
  if ((inputBuffer.Length - inputCount) < inputOffset)
  {
  throw new ArgumentOutOfRangeException("inputOffset");
  }
  if (this.State == 0)
  {
  Initialize();
  }
  HashCore(inputBuffer, inputOffset, inputCount);
  HashValue = HashFinal();
  byte[] buffer = new byte[inputCount];
  Buffer.BlockCopy(inputBuffer, inputOffset, buffer, 0, inputCount);
  this.State = 0;
  return buffer;
  }
  #endregion
  
  protected virtual void Dispose(bool disposing)
  {
  if (!disposing)
  Initialize();
  }
  public void Dispose()
  {
  Dispose(true);
  }
  }
  }

标签：MD5Core 和 MD5_Client 

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