2 // MACTripleDES.cs: Handles MAC with TripleDES
5 // Sebastien Pouliot (spouliot@motus.com)
7 // (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
8 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
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15 // permit persons to whom the Software is furnished to do so, subject to
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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).
42 public class MACTripleDES: KeyedHashAlgorithm {
44 private TripleDES tdes;
45 private MACAlgorithm mac;
46 private bool m_disposed;
48 public MACTripleDES ()
50 Setup ("TripleDES", null);
53 public MACTripleDES (byte[] rgbKey)
56 throw new ArgumentNullException ("rgbKey");
57 Setup ("TripleDES", rgbKey);
60 public MACTripleDES (string strTripleDES, byte[] rgbKey)
63 throw new ArgumentNullException ("rgbKey");
64 if (strTripleDES == null)
65 Setup ("TripleDES", rgbKey);
67 Setup (strTripleDES, rgbKey);
70 private void Setup (string strTripleDES, byte[] rgbKey)
72 tdes = TripleDES.Create (strTripleDES);
73 // default padding (as using in Fx 1.0 and 1.1)
74 tdes.Padding = PaddingMode.Zeros;
75 // if rgbKey is null we keep the randomly generated key
77 // this way we get the TripleDES key validation (like weak
78 // and semi-weak keys)
81 HashSizeValue = tdes.BlockSize;
82 // we use Key property to get the additional validations
83 // (from KeyedHashAlgorithm ancestor)
85 mac = new MACAlgorithm (tdes);
96 public PaddingMode Padding {
97 get { return tdes.Padding; }
98 set { tdes.Padding = value; }
102 protected override void Dispose (bool disposing)
105 // note: we ALWAYS zeroize keys (disposing or not)
107 // clear our copy of the secret key
108 if (KeyValue != null)
109 Array.Clear (KeyValue, 0, KeyValue.Length);
110 // clear the secret key (inside TripleDES)
115 // disposed managed stuff
120 base.Dispose (disposing);
125 public override void Initialize ()
128 throw new ObjectDisposedException ("MACTripleDES");
130 mac.Initialize (KeyValue);
133 protected override void HashCore (byte[] rgb, int ib, int cb)
136 throw new ObjectDisposedException ("MACTripleDES");
141 mac.Core (rgb, ib, cb);
144 protected override byte[] HashFinal ()
147 throw new ObjectDisposedException ("MACTripleDES");