在Windows Phone上散列流

我想創建一個擴展方法，它將在Windows Phone上散列流。這是很容易爲iOS和Android，因爲我可以叫這樣的事情：在Windows Phone上散列流

var hasher = MD5.Create(); 
var hashBytes = hasher.ComputeHash(stream); 
var hash = Convert.ToBase64String(hashBytes);

但在Windows Phone上，該API是不可用，所以我正在努力創造我自己的，我需要這個方法是同步的，以便我需要找出一種方法來同步調用inputStream.ReadAsync（），但沒有Result屬性或Wait（）方法。我還發現沒有任何東西可以放入buffer。

這是我到目前爲止有：

/// <summary> 
/// Hashes the stream. 
/// </summary> 
/// <param name="stream">The stream.</param> 
/// <param name="algorithm">The hash algorithm. Defaults to MD5.</param> 
/// <returns>The hexadecimal hash value of the stream.</returns> 
public static string Hash(this Stream stream, string algorithm = null) 
{ 
    if (stream == null) 
     return string.Empty; 

    var streamPositionBeforeHashing = stream.Position; 
    stream.Position = 0; 

    var alg = HashAlgorithmProvider.OpenAlgorithm(algorithm ?? HashAlgorithmNames.Md5); 
    var inputStream = stream.AsInputStream(); 
    uint capacity = (uint) Math.Min(stream.Length, 100000000); 
    var buffer = new Buffer(capacity); 
    var hash = alg.CreateHash(); 

    while (true) 
    { 
     var result = inputStream.ReadAsync(buffer, capacity, InputStreamOptions.None); 

     if (buffer.Length > 0) 
      hash.Append(buffer); 
     else 
      break; 
    } 

    var hashText = CryptographicBuffer.EncodeToHexString(hash.GetValueAndReset()) 
     .Replace("=", string.Empty) 
     .Replace("\\", string.Empty) 
     .Replace("/", string.Empty); 

    inputStream.Dispose(); 
    stream.Position = streamPositionBeforeHashing; 
    return hashText; 
}

來源

2016-02-28 Adam

找到一些helper [這裏]（http://stackoverflow.com/questions/5095183/how-would-i-run-an-async-taskt-method-synchronously）。希望你的情況也一樣有用。 –

我結束了使用跨平臺實現MD5加密服務提供商來獲得類似的散列法的一個iOS和Android上找到。

https://raw.githubusercontent.com/XLabs/Xamarin-Forms-Labs/master/src/Cryptography/XLabs.Cryptography/MD5.cs

using System; 
using System.IO; 
using System.Text; 

namespace XLabs.Cryptography 
{ 
    /// <summary> 
    /// Summary description for MD5. 
    /// </summary> 
    public class MD5 : IDisposable 
    { 
     /// <summary> 
     /// Creates the specified hash name. 
     /// </summary> 
     /// <param name="hashName">Name of the hash.</param> 
     /// <returns>MD5.</returns> 
     /// <exception cref="System.NotSupportedException"></exception> 
     static public MD5 Create(string hashName) 
     { 
      if (hashName == "MD5") 
       return new MD5(); 
      else 
       throw new NotSupportedException(); 
     } 

     /// <summary> 
     /// Gets the MD5 string. 
     /// </summary> 
     /// <param name="source">The source.</param> 
     /// <returns>System.String.</returns> 
     static public string GetMd5String(String source) 
     { 
      var md = Create(); 
      var hash = md.ComputeHash(Encoding.UTF8.GetBytes(source)); 

      var sb = new StringBuilder(); 
      foreach (byte b in hash) sb.Append(b.ToString("x2")); 
      return sb.ToString(); 
     } 

     /// <summary> 
     /// Creates this instance. 
     /// </summary> 
     /// <returns>MD5.</returns> 
     static public MD5 Create() 
     { 
      return new MD5(); 
     } 

     #region base implementation of the MD5 
     #region constants 
     /// <summary> 
     /// The S11 
     /// </summary> 
     private const byte S11 = 7; 
     /// <summary> 
     /// The S12 
     /// </summary> 
     private const byte S12 = 12; 
     /// <summary> 
     /// The S13 
     /// </summary> 
     private const byte S13 = 17; 
     /// <summary> 
     /// The S14 
     /// </summary> 
     private const byte S14 = 22; 
     /// <summary> 
     /// The S21 
     /// </summary> 
     private const byte S21 = 5; 
     /// <summary> 
     /// The S22 
     /// </summary> 
     private const byte S22 = 9; 
     /// <summary> 
     /// The S23 
     /// </summary> 
     private const byte S23 = 14; 
     /// <summary> 
     /// The S24 
     /// </summary> 
     private const byte S24 = 20; 
     /// <summary> 
     /// The S31 
     /// </summary> 
     private const byte S31 = 4; 
     /// <summary> 
     /// The S32 
     /// </summary> 
     private const byte S32 = 11; 
     /// <summary> 
     /// The S33 
     /// </summary> 
     private const byte S33 = 16; 
     /// <summary> 
     /// The S34 
     /// </summary> 
     private const byte S34 = 23; 
     /// <summary> 
     /// The S41 
     /// </summary> 
     private const byte S41 = 6; 
     /// <summary> 
     /// The S42 
     /// </summary> 
     private const byte S42 = 10; 
     /// <summary> 
     /// The S43 
     /// </summary> 
     private const byte S43 = 15; 
     /// <summary> 
     /// The S44 
     /// </summary> 
     private const byte S44 = 21; 
     /// <summary> 
     /// The padding 
     /// </summary> 
     static private readonly byte[] Padding = { 
      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 functions. 
     /// <summary> 
     /// fs the specified x. 
     /// </summary> 
     /// <param name="x">The x.</param> 
     /// <param name="y">The y.</param> 
     /// <param name="z">The z.</param> 
     /// <returns>System.UInt32.</returns> 
     static private uint F(uint x, uint y, uint z) 
     { 
      return (((x) & (y)) | ((~x) & (z))); 
     } 
     /// <summary> 
     /// gs the specified x. 
     /// </summary> 
     /// <param name="x">The x.</param> 
     /// <param name="y">The y.</param> 
     /// <param name="z">The z.</param> 
     /// <returns>System.UInt32.</returns> 
     static private uint G(uint x, uint y, uint z) 
     { 
      return (((x) & (z)) | ((y) & (~z))); 
     } 
     /// <summary> 
     /// hes the specified x. 
     /// </summary> 
     /// <param name="x">The x.</param> 
     /// <param name="y">The y.</param> 
     /// <param name="z">The z.</param> 
     /// <returns>System.UInt32.</returns> 
     static private uint H(uint x, uint y, uint z) 
     { 
      return ((x)^(y)^(z)); 
     } 
     /// <summary> 
     /// is the specified x. 
     /// </summary> 
     /// <param name="x">The x.</param> 
     /// <param name="y">The y.</param> 
     /// <param name="z">The z.</param> 
     /// <returns>System.UInt32.</returns> 
     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">The x.</param> 
     /// <param name="n">The n.</param> 
     /// <returns>System.UInt32.</returns> 
     static private uint ROTATE_LEFT(uint x, byte n) 
     { 
      return (((x) << (n)) | ((x) >> (32 - (n)))); 
     } 
     #endregion 

     #region FF, GG, HH, and II transformations 
     /// <summary> 
     /// Ffs the specified a. 
     /// </summary> 
     /// <param name="a">a.</param> 
     /// <param name="b">The b.</param> 
     /// <param name="c">The c.</param> 
     /// <param name="d">The d.</param> 
     /// <param name="x">The x.</param> 
     /// <param name="s">The s.</param> 
     /// <param name="ac">The ac.</param> 
     /// 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); 
     } 
     /// <summary> 
     /// Ggs the specified a. 
     /// </summary> 
     /// <param name="a">a.</param> 
     /// <param name="b">The b.</param> 
     /// <param name="c">The c.</param> 
     /// <param name="d">The d.</param> 
     /// <param name="x">The x.</param> 
     /// <param name="s">The s.</param> 
     /// <param name="ac">The ac.</param> 
     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); 
     } 
     /// <summary> 
     /// Hhes the specified a. 
     /// </summary> 
     /// <param name="a">a.</param> 
     /// <param name="b">The b.</param> 
     /// <param name="c">The c.</param> 
     /// <param name="d">The d.</param> 
     /// <param name="x">The x.</param> 
     /// <param name="s">The s.</param> 
     /// <param name="ac">The ac.</param> 
     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); 
     } 
     /// <summary> 
     /// Iis the specified a. 
     /// </summary> 
     /// <param name="a">a.</param> 
     /// <param name="b">The b.</param> 
     /// <param name="c">The c.</param> 
     /// <param name="d">The d.</param> 
     /// <param name="x">The x.</param> 
     /// <param name="s">The s.</param> 
     /// <param name="ac">The ac.</param> 
     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> 
     readonly uint[] state = new uint[4]; 

     /// <summary> 
     /// number of bits, modulo 2^64 (lsb first) 
     /// </summary> 
     readonly uint[] count = new uint[2]; 

     /// <summary> 
     /// input buffer 
     /// </summary> 
     readonly byte[] buffer = new byte[64]; 
     #endregion 

     /// <summary> 
     /// Initializes a new instance of the <see cref="MD5"/> class. 
     /// </summary> 
     internal MD5() 
     { 
      Initialize(); 
     } 

     /// <summary> 
     /// MD5 initialization. Begins an MD5 operation, writing a new context. 
     /// </summary> 
     /// <remarks>The RFC named it "MD5Init"</remarks> 
     public virtual void Initialize() 
     { 
      this.count[0] = this.count[1] = 0; 

      // Load magic initialization constants. 
      this.state[0] = 0x67452301; 
      this.state[1] = 0xefcdab89; 
      this.state[2] = 0x98badcfe; 
      this.state[3] = 0x10325476; 
     } 

     /// <summary> 
     /// MD5 block update operation. Continues an MD5 message-digest 
     /// operation, processing another message block, and updating the 
     /// context. 
     /// </summary> 
     /// <param name="input">The input.</param> 
     /// <param name="offset">The offset.</param> 
     /// <param name="count">The count.</param> 
     /// <remarks>The RFC Named it MD5Update</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 finalization. Ends an MD5 message-digest operation, writing the 
     /// the message digest and zeroizing the context. 
     /// </summary> 
     /// <returns>message digest</returns> 
     /// <remarks>The RFC named it MD5Final</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, this.state, 0, 16); 

      // Zeroize sensitive information. 
      this.count[0] = this.count[1] = 0; 
      this.state[0] = 0; 
      this.state[1] = 0; 
      this.state[2] = 0; 
      this.state[3] = 0; 

      // initialize again, to be ready to use 
      Initialize(); 

      return digest; 
     } 

     /// <summary> 
     /// MD5 basic transformation. Transforms state based on 64 bytes block. 
     /// </summary> 
     /// <param name="block">The block.</param> 
     /// <param name="offset">The offset.</param> 
     private void Transform(byte[] block, int offset) 
     { 
      uint a = this.state[0], b = this.state[1], c = this.state[2], d = this.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 */ 

      this.state[0] += a; 
      this.state[1] += b; 
      this.state[2] += c; 
      this.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">The output.</param> 
     /// <param name="outputOffset">The output offset.</param> 
     /// <param name="input">The input.</param> 
     /// <param name="inputOffset">The input offset.</param> 
     /// <param name="count">The 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">The output.</param> 
     /// <param name="outputOffset">The output offset.</param> 
     /// <param name="input">The input.</param> 
     /// <param name="inputOffset">The input offset.</param> 
     /// <param name="count">The 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] = 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 object 

     /// <summary> 
     /// The hash value 
     /// </summary> 
     protected byte[] HashValue; 
     /// <summary> 
     /// The state 
     /// </summary> 
     protected int State; 
     /// <summary> 
     /// Gets a value indicating whether this instance can reuse transform. 
     /// </summary> 
     /// <value><c>true</c> if this instance can reuse transform; otherwise, <c>false</c>.</value> 
     public virtual bool CanReuseTransform 
     { 
      get 
      { 
       return true; 
      } 
     } 

     /// <summary> 
     /// Gets a value indicating whether this instance can transform multiple blocks. 
     /// </summary> 
     /// <value><c>true</c> if this instance can transform multiple blocks; otherwise, <c>false</c>.</value> 
     public virtual bool CanTransformMultipleBlocks 
     { 
      get 
      { 
       return true; 
      } 
     } 
     /// <summary> 
     /// Gets the hash. 
     /// </summary> 
     /// <value>The hash.</value> 
     /// <exception cref="System.InvalidOperationException"></exception> 
     public virtual byte[] Hash 
     { 
      get 
      { 
       if (this.State != 0) 
        throw new InvalidOperationException(); 
       return (byte[])this.HashValue.Clone(); 
      } 
     } 
     /// <summary> 
     /// Gets the size of the hash. 
     /// </summary> 
     /// <value>The size of the hash.</value> 
     public virtual int HashSize 
     { 
      get 
      { 
       return this.HashSizeValue; 
      } 
     } 
     /// <summary> 
     /// The hash size value 
     /// </summary> 
     protected int HashSizeValue = 128; 

     /// <summary> 
     /// Gets the size of the input block. 
     /// </summary> 
     /// <value>The size of the input block.</value> 
     public virtual int InputBlockSize 
     { 
      get 
      { 
       return 1; 
      } 
     } 
     /// <summary> 
     /// Gets the size of the output block. 
     /// </summary> 
     /// <value>The size of the output block.</value> 
     public virtual int OutputBlockSize 
     { 
      get 
      { 
       return 1; 
      } 
     } 

     /// <summary> 
     /// Clears this instance. 
     /// </summary> 
     public void Clear() 
     { 
      Dispose(true); 
     } 

     /// <summary> 
     /// Computes the hash. 
     /// </summary> 
     /// <param name="buffer">The buffer.</param> 
     /// <returns>System.Byte[].</returns> 
     public byte[] ComputeHash(byte[] buffer) 
     { 
      return ComputeHash(buffer, 0, buffer.Length); 
     } 
     /// <summary> 
     /// Computes the hash. 
     /// </summary> 
     /// <param name="buffer">The buffer.</param> 
     /// <param name="offset">The offset.</param> 
     /// <param name="count">The count.</param> 
     /// <returns>System.Byte[].</returns> 
     public byte[] ComputeHash(byte[] buffer, int offset, int count) 
     { 
      Initialize(); 
      HashCore(buffer, offset, count); 
      this.HashValue = HashFinal(); 
      return (byte[])this.HashValue.Clone(); 
     } 

     /// <summary> 
     /// Computes the hash. 
     /// </summary> 
     /// <param name="inputStream">The input stream.</param> 
     /// <returns>System.Byte[].</returns> 
     public byte[] ComputeHash(Stream inputStream) 
     { 
      Initialize(); 
      int count; 
      byte[] buffer = new byte[4096]; 
      while (0 < (count = inputStream.Read(buffer, 0, 4096))) 
      { 
       HashCore(buffer, 0, count); 
      } 
      this.HashValue = HashFinal(); 
      return (byte[])this.HashValue.Clone(); 
     } 

     /// <summary> 
     /// Transforms the block. 
     /// </summary> 
     /// <param name="inputBuffer">The input buffer.</param> 
     /// <param name="inputOffset">The input offset.</param> 
     /// <param name="inputCount">The input count.</param> 
     /// <param name="outputBuffer">The output buffer.</param> 
     /// <param name="outputOffset">The output offset.</param> 
     /// <returns>System.Int32.</returns> 
     /// <exception cref="System.ArgumentNullException">inputBuffer</exception> 
     /// <exception cref="System.ArgumentOutOfRangeException"> 
     /// inputOffset 
     /// or 
     /// inputOffset 
     /// </exception> 
     /// <exception cref="System.ArgumentException">inputCount</exception> 
     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; 
     } 
     /// <summary> 
     /// Transforms the final block. 
     /// </summary> 
     /// <param name="inputBuffer">The input buffer.</param> 
     /// <param name="inputOffset">The input offset.</param> 
     /// <param name="inputCount">The input count.</param> 
     /// <returns>System.Byte[].</returns> 
     /// <exception cref="System.ArgumentNullException">inputBuffer</exception> 
     /// <exception cref="System.ArgumentOutOfRangeException"> 
     /// inputOffset 
     /// or 
     /// inputOffset 
     /// </exception> 
     /// <exception cref="System.ArgumentException">inputCount</exception> 
     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); 
      this.HashValue = HashFinal(); 
      byte[] buffer = new byte[inputCount]; 
      Buffer.BlockCopy(inputBuffer, inputOffset, buffer, 0, inputCount); 
      this.State = 0; 
      return buffer; 
     } 
     #endregion 

     /// <summary> 
     /// Releases unmanaged and - optionally - managed resources. 
     /// </summary> 
     /// <param name="disposing"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param> 
     protected virtual void Dispose(bool disposing) 
     { 
      if (!disposing) 
       Initialize(); 
     } 
     /// <summary> 
     /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources. 
     /// </summary> 
     public void Dispose() 
     { 
      Dispose(true); 
     } 
    } 
}

來源

2016-03-16 01:45:47 Adam

在Windows Phone上散列流

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