2 // MACTripleDES.cs: Handles MAC with TripleDES
5 // Sebastien Pouliot (sebastien@ximian.com)
7 // (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
8 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
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30 using System.Runtime.InteropServices;
32 using Mono.Security.Cryptography;
34 namespace System.Security.Cryptography {
37 // a. FIPS PUB 81: DES MODES OF OPERATION
38 // MAC: Appendix F (MACDES not MACTripleDES but close enough ;-)
39 // http://www.itl.nist.gov/fipspubs/fip81.htm
41 // LAMESPEC: MACTripleDES == MAC-CBC using TripleDES (not MAC-CFB).
43 public class MACTripleDES: KeyedHashAlgorithm {
45 private TripleDES tdes;
46 private MACAlgorithm mac;
47 private bool m_disposed;
49 public MACTripleDES ()
51 Setup ("TripleDES", null);
54 public MACTripleDES (byte[] rgbKey)
57 throw new ArgumentNullException ("rgbKey");
58 Setup ("TripleDES", rgbKey);
61 public MACTripleDES (string strTripleDES, byte[] rgbKey)
64 throw new ArgumentNullException ("rgbKey");
65 if (strTripleDES == null)
66 Setup ("TripleDES", rgbKey);
68 Setup (strTripleDES, rgbKey);
71 private void Setup (string strTripleDES, byte[] rgbKey)
73 tdes = TripleDES.Create (strTripleDES);
74 // default padding (as using in Fx 1.0 and 1.1)
75 tdes.Padding = PaddingMode.Zeros;
76 // if rgbKey is null we keep the randomly generated key
78 // this way we get the TripleDES key validation (like weak
79 // and semi-weak keys)
82 HashSizeValue = tdes.BlockSize;
83 // we use Key property to get the additional validations
84 // (from KeyedHashAlgorithm ancestor)
86 mac = new MACAlgorithm (tdes);
91 public PaddingMode Padding {
92 get { return tdes.Padding; }
93 set { tdes.Padding = value; }
96 protected override void Dispose (bool disposing)
99 // note: we ALWAYS zeroize keys (disposing or not)
101 // clear our copy of the secret key
102 if (KeyValue != null)
103 Array.Clear (KeyValue, 0, KeyValue.Length);
104 // clear the secret key (inside TripleDES)
109 // disposed managed stuff
114 base.Dispose (disposing);
119 public override void Initialize ()
122 throw new ObjectDisposedException ("MACTripleDES");
124 mac.Initialize (KeyValue);
127 protected override void HashCore (byte[] rgbData, int ibStart, int cbSize)
130 throw new ObjectDisposedException ("MACTripleDES");
135 mac.Core (rgbData, ibStart, cbSize);
138 protected override byte[] HashFinal ()
141 throw new ObjectDisposedException ("MACTripleDES");