code.grnet.gr Git - pithos-ms-client/blob - trunk/hammock/src/netCF/Hammock.Compact/Security/Cryptography/HMACSHA1.cs

   1 using System;
   2 using System.Security.Cryptography;
   3 using Hammock.Mono.Security.Cryptography;
   4
   5 namespace Hammock.Security.Cryptography
   6 {
   7   public class HMACSHA1 : KeyedHashAlgorithm
   8   {
   9     private readonly HMACAlgorithm hmac;
  10     private bool m_disposed;
  11
  12     public override sealed byte[] Key
  13     {
  14       get
  15       {
  16         return base.Key;
  17       }
  18       set
  19       {
  20         this.hmac.Key = value;
  21         base.Key = value;
  22       }
  23     }
  24
  25     public string HashName
  26     {
  27       get
  28       {
  29         return this.hmac.HashName;
  30       }
  31       set
  32       {
  33         if (this.State == 0)
  34           this.hmac.HashName = value;
  35       }
  36     }
  37
  38     public HMACSHA1()
  39       : this(KeyBuilder.Key(8))
  40     {
  41     }
  42
  43     public HMACSHA1(byte[] rgbKey)
  44     {
  45       this.hmac = new HMACAlgorithm("SHA1");
  46       this.HashSizeValue = 160;
  47       this.Key = rgbKey;
  48       this.m_disposed = false;
  49     }
  50
  51     ~HMACSHA1()
  52     {
  53       this.Dispose(false);
  54     }
  55
  56     protected override void Dispose(bool disposing)
  57     {
  58       if (!this.m_disposed)
  59       {
  60         if (this.hmac != null)
  61           this.hmac.Dispose();
  62         base.Dispose(disposing);
  63         this.m_disposed = true;
  64       }
  65     }
  66
  67     public override void Initialize()
  68     {
  69       if (this.m_disposed)
  70         throw new ObjectDisposedException("HMACSHA1");
  71       else if (!(this.hmac.Algo is SHA1))
  72       {
  73         throw new InvalidCastException(string.Format("Invalid hash algorithm '{0}', expected '{1}'.", this.hmac.Algo == null ? (object)"none" : (object)this.hmac.Algo.GetType().ToString(), (object)"SHA1"));
  74       }
  75       else
  76       {
  77         this.State = 0;
  78         this.hmac.Initialize();
  79       }
  80     }
  81
  82     protected override void HashCore(byte[] rgb, int ib, int cb)
  83     {
  84       if (this.m_disposed)
  85       {
  86         throw new ObjectDisposedException("HMACSHA1");
  87       }
  88       else
  89       {
  90         if (this.State == 0)
  91         {
  92           this.Initialize();
  93           this.State = 1;
  94         }
  95         this.hmac.Core(rgb, ib, cb);
  96       }
  97     }
  98
  99     protected override byte[] HashFinal()
 100     {
 101       if (this.m_disposed)
 102       {
 103         throw new ObjectDisposedException("HMACSHA1");
 104       }
 105       else
 106       {
 107         this.State = 0;
 108         return this.hmac.Final();
 109       }
 110     }
 111   }
 112 }