mcs/class/corlib/System.Security.Cryptography/HMACSHA1.cs

   1 //
   2 // HMACSHA1.cs: Handles HMAC with SHA-1
   3 //
   4 // Author:
   5 //      Sebastien Pouliot  <sebastien@ximian.com>
   6 //
   7 // (C) 2003 Motus Technologies Inc. (http://www.motus.com)
   8 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System.IO;
  31 using System.Runtime.InteropServices;
  32
  33 using Mono.Security.Cryptography;
  34
  35 namespace System.Security.Cryptography {
  36
  37         // References:
  38         // a.   FIPS PUB 198: The Keyed-Hash Message Authentication Code (HMAC), 2002 March.
  39         //      http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf
  40         // b.   Internet RFC 2104, HMAC, Keyed-Hashing for Message Authentication
  41         //      (include C source for HMAC-MD5)
  42         //      http://www.ietf.org/rfc/rfc2104.txt
  43         // c.   IETF RFC2202: Test Cases for HMAC-MD5 and HMAC-SHA-1
  44         //      (include C source for HMAC-MD5 and HAMAC-SHA1)
  45         //      http://www.ietf.org/rfc/rfc2202.txt
  46         // d.   ANSI X9.71, Keyed Hash Message Authentication Code.
  47         //      not free :-(
  48         //      http://webstore.ansi.org/ansidocstore/product.asp?sku=ANSI+X9%2E71%2D2000
  49
  50 #if ! NET_2_0
  51         public class HMACSHA1: KeyedHashAlgorithm {
  52                 private HMACAlgorithm hmac;
  53                 private bool m_disposed;
  54
  55                 public HMACSHA1 () : this (KeyBuilder.Key (8))
  56                 {
  57                 }
  58
  59                 public HMACSHA1 (byte[] rgbKey) : base ()
  60                 {
  61                         hmac = new HMACAlgorithm ("SHA1");
  62                         HashSizeValue = 160;
  63                         Key = rgbKey;
  64                         m_disposed = false;
  65                 }
  66
  67                 ~HMACSHA1 ()
  68                 {
  69                         Dispose (false);
  70                 }
  71
  72                 public override byte[] Key {
  73                         get { return base.Key; }
  74                         set {
  75                                 hmac.Key = value;
  76                                 base.Key = value;
  77                         }
  78                 }
  79
  80                 public string HashName {
  81                         get { return hmac.HashName; }
  82                         set {
  83                                 // only if its not too late for a change
  84                                 if (State == 0)
  85                                         hmac.HashName = value;
  86                         }
  87                 }
  88
  89                 protected override void Dispose (bool disposing)
  90                 {
  91                         if (!m_disposed) {
  92                                 if (hmac != null)
  93                                         hmac.Dispose();
  94                                 base.Dispose (disposing);
  95                                 m_disposed = true;
  96                         }
  97                 }
  98
  99                 public override void Initialize ()
 100                 {
 101                         if (m_disposed)
 102                                 throw new ObjectDisposedException ("HMACSHA1");
 103                         // let us throw an exception if hash name is invalid
 104                         // for HMACSHA1 (obviously this can't be done by the
 105                         // generic HMAC class)
 106                         if (!(hmac.Algo is SHA1)) {
 107                                 string algo = (hmac.Algo == null) ? "none" : hmac.Algo.GetType ().ToString ();
 108                                 string msg = Locale.GetText ("Invalid hash algorithm '{0}', expected '{1}'.");
 109                                 throw new InvalidCastException (String.Format (msg, algo, "SHA1"));
 110                         }
 111                         State = 0;
 112                         hmac.Initialize ();
 113                 }
 114
 115                 protected override void HashCore (byte[] rgb, int ib, int cb)
 116                 {
 117                         if (m_disposed)
 118                                 throw new ObjectDisposedException ("HMACSHA1");
 119
 120                         if (State == 0) {
 121                                 Initialize ();
 122                                 State = 1;
 123                         }
 124                         hmac.Core (rgb, ib, cb);
 125                 }
 126
 127                 protected override byte[] HashFinal ()
 128                 {
 129                         if (m_disposed)
 130                                 throw new ObjectDisposedException ("HMACSHA1");
 131
 132                         State = 0;
 133                         return hmac.Final ();
 134                 }
 135         }
 136 #else
 137         [ComVisible (true)]
 138         public class HMACSHA1 : HMAC {
 139
 140                 public HMACSHA1 ()
 141                         : this (KeyBuilder.Key (8))
 142                 {
 143                 }
 144
 145                 public HMACSHA1 (byte[] rgbKey)
 146                 {
 147                         HashName = "SHA1";
 148                         HashSizeValue = 160;
 149                         Key = rgbKey;
 150                 }
 151
 152                 public HMACSHA1 (byte[] rgbKey, bool useManagedSha1)
 153                 {
 154                         HashName = "System.Security.Cryptography.SHA1" + (useManagedSha1 ? "Managed" : "CryptoServiceProvider");
 155                         HashSizeValue = 160;
 156                         Key = rgbKey;
 157                 }
 158         }
 159 #endif
 160 }