mcs/class/referencesource/mscorlib/system/security/permissions/strongnamepublickeyblob.cs

   1 // ==++==
   2 //
   3 //   Copyright (c) Microsoft Corporation.  All rights reserved.
   4 //
   5 // ==--==
   6 // StrongNamePublicKeyBlob.cs
   7 //
   8 // <OWNER>Microsoft</OWNER>
   9 //
  10
  11 namespace System.Security.Permissions
  12 {
  13     using System;
  14     using System.Security.Util;
  15     using System.Diagnostics.Contracts;
  16
  17     [System.Runtime.InteropServices.ComVisible(true)]
  18     [Serializable] sealed public class StrongNamePublicKeyBlob
  19     {
  20         internal byte[] PublicKey;
  21
  22         internal StrongNamePublicKeyBlob()
  23         {
  24         }
  25
  26         public StrongNamePublicKeyBlob( byte[] publicKey )
  27         {
  28             if (publicKey == null)
  29                 throw new ArgumentNullException( "PublicKey" );
  30             Contract.EndContractBlock();
  31
  32             this.PublicKey = new byte[publicKey.Length];
  33             Array.Copy( publicKey, 0, this.PublicKey, 0, publicKey.Length );
  34         }
  35
  36         internal StrongNamePublicKeyBlob( String publicKey )
  37         {
  38             this.PublicKey = Hex.DecodeHexString( publicKey );
  39         }
  40
  41         private static bool CompareArrays( byte[] first, byte[] second )
  42         {
  43             if (first.Length != second.Length)
  44             {
  45                 return false;
  46             }
  47
  48             int count = first.Length;
  49             for (int i = 0; i < count; ++i)
  50             {
  51                 if (first[i] != second[i])
  52                     return false;
  53             }
  54
  55             return true;
  56         }
  57
  58
  59         internal bool Equals( StrongNamePublicKeyBlob blob )
  60         {
  61             if (blob == null)
  62                 return false;
  63             else
  64                 return CompareArrays( this.PublicKey, blob.PublicKey );
  65         }
  66
  67         public override bool Equals( Object obj )
  68         {
  69             if (obj == null || !(obj is StrongNamePublicKeyBlob))
  70                 return false;
  71
  72             return this.Equals( (StrongNamePublicKeyBlob)obj );
  73         }
  74
  75         static private int GetByteArrayHashCode( byte[] baData )
  76         {
  77             if (baData == null)
  78                 return 0;
  79
  80             int accumulator = 0;
  81
  82             for (int i = 0; i < baData.Length; ++i)
  83             {
  84                 accumulator = (accumulator << 8) ^ (int)baData[i] ^ (accumulator >> 24);
  85             }
  86
  87             return accumulator;
  88         }
  89
  90         public override int GetHashCode()
  91         {
  92             return GetByteArrayHashCode( PublicKey );
  93         }
  94
  95         public override String ToString()
  96         {
  97             return Hex.EncodeHexString( PublicKey );
  98         }
  99     }
 100 }