Gonna try jboss srp implementation, because if I implement myself one we

will have to audit it.

9 files changed, 1354 insertions, 0 deletions

diff --git a/src/org/jboss/security/srp/SRPClientSession.java b/src/org/jboss/security/srp/SRPClientSession.java
new file mode 100644
index 00000000..bafc4842
--- /dev/null
+++ b/src/org/jboss/security/srp/SRPClientSession.java
@@ -0,0 +1,289 @@
+/*
+ * JBoss, Home of Professional Open Source.
+ * Copyright 2008, Red Hat Middleware LLC, and individual contributors
+ * as indicated by the @author tags. See the copyright.txt file in the
+ * distribution for a full listing of individual contributors.
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this software; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
+ */
+package org.jboss.security.srp;
+
+import java.math.BigInteger;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.Arrays;
+
+import org.jboss.crypto.CryptoUtil;
+import org.jboss.logging.Logger; 
+
+/** The client side logic to the SRP protocol. The class is intended to be used
+ * with a SRPServerSession object via the SRPServerInterface. The SRP algorithm
+ * using these classes consists of:
+ *
+ * 1. Get server, SRPServerInterface server = (SRPServerInterface) Naming.lookup(...);
+ * 2. Get SRP parameters, SRPParameters params = server.getSRPParameters(username);
+ * 3. Create a client session, SRPClientSession client = new SRPClientSession(username,
+ * password, params);
+ * 4. Exchange public keys, byte[] A = client.exponential();
+ * byte[] B = server.init(username, A);
+ * 5. Exchange challenges, byte[] M1 = client.response(B);
+ * byte[] M2 = server.verify(username, M1);
+ * 6. Verify the server response, if( client.verify(M2) == false )
+ * throw new SecurityException("Failed to validate server reply");
+ * 7. Validation complete
+ *
+ * Note that these steps are stateful. They must be performed in order and a
+ * step cannot be repeated to update the session state.
+ *
+ * This product uses the 'Secure Remote Password' cryptographic
+ * authentication system developed by Tom Wu (tjw@CS.Stanford.EDU).
+ *
+ * @author Scott.Stark@jboss.org
+ * @version $Revision: 81038 $
+ */
+public class SRPClientSession
+{
+   private static Logger log = Logger.getLogger(SRPClientSession.class);
+   private SRPParameters params;
+   private BigInteger N;
+   private BigInteger g;
+   private BigInteger x;
+   private BigInteger v;
+   private byte[] s;
+   private BigInteger a;
+   private BigInteger A;
+   private byte[] K;
+   /** The M1 = H(H(N) xor H(g) | H(U) | s | A | B | K) hash */
+   private MessageDigest clientHash;
+   /** The M2 = H(A | M | K) hash */
+   private MessageDigest serverHash;
+   
+   private static int A_LEN = 64;
+   
+   /** Creates a new SRP server session object from the username, password
+    verifier,
+    @param username, the user ID
+    @param password, the user clear text password
+    @param params, the SRP parameters for the session
+    */
+   public SRPClientSession(String username, char[] password, SRPParameters params)
+   {
+      this(username, password, params, null);
+   }
+
+   /** Creates a new SRP server session object from the username, password
+    verifier,
+    @param username, the user ID
+    @param password, the user clear text password
+    @param params, the SRP parameters for the session
+    @param abytes, the random exponent used in the A public key. This must be
+      8 bytes in length.
+    */
+   public SRPClientSession(String username, char[] password, SRPParameters params,
+      byte[] abytes)
+   {
+      try
+      {
+         // Initialize the secure random number and message digests
+         CryptoUtil.init();
+      }
+      catch(NoSuchAlgorithmException e)
+      {
+      }
+      this.params = params;
+      this.g = new BigInteger(1, params.g);
+      this.N = new BigInteger(1, params.N);
+      if( abytes != null )
+      {
+         if( 8*abytes.length != A_LEN )
+            throw new IllegalArgumentException("The abytes param must be "
+               +(A_LEN/8)+" in length, abytes.length="+abytes.length);
+         this.a = new BigInteger(abytes);
+      }
+
+      if( log.isTraceEnabled() )
+         log.trace("g: "+CryptoUtil.tob64(params.g));
+      // Calculate x = H(s | H(U | ':' | password))
+      byte[] xb = CryptoUtil.calculatePasswordHash(username, password, params.s);
+      if( log.isTraceEnabled() )
+         log.trace("x: "+CryptoUtil.tob64(xb));
+      this.x = new BigInteger(1, xb);
+      this.v = g.modPow(x, N);  // g^x % N
+      if( log.isTraceEnabled() )
+         log.trace("v: "+CryptoUtil.tob64(v.toByteArray()));
+      
+      serverHash = CryptoUtil.newDigest();
+      clientHash = CryptoUtil.newDigest();
+      // H(N)
+      byte[] hn = CryptoUtil.newDigest().digest(params.N);
+      if( log.isTraceEnabled() )
+         log.trace("H(N): "+CryptoUtil.tob64(hn));
+      // H(g)
+      byte[] hg = CryptoUtil.newDigest().digest(params.g);
+      if( log.isTraceEnabled() )
+         log.trace("H(g): "+CryptoUtil.tob64(hg));
+      // clientHash = H(N) xor H(g)
+      byte[] hxg = CryptoUtil.xor(hn, hg, 20);
+      if( log.isTraceEnabled() )
+         log.trace("H(N) xor H(g): "+CryptoUtil.tob64(hxg));
+      clientHash.update(hxg);
+      if( log.isTraceEnabled() )
+      {
+         MessageDigest tmp = CryptoUtil.copy(clientHash);
+         log.trace("H[H(N) xor H(g)]: "+CryptoUtil.tob64(tmp.digest()));
+      }
+      // clientHash = H(N) xor H(g) | H(U)
+      clientHash.update(CryptoUtil.newDigest().digest(username.getBytes()));
+      if( log.isTraceEnabled() )
+      {
+         MessageDigest tmp = CryptoUtil.copy(clientHash);
+         log.trace("H[H(N) xor H(g) | H(U)]: "+CryptoUtil.tob64(tmp.digest()));
+      }
+      // clientHash = H(N) xor H(g) | H(U) | s
+      clientHash.update(params.s);
+      if( log.isTraceEnabled() )
+      {
+         MessageDigest tmp = CryptoUtil.copy(clientHash);
+         log.trace("H[H(N) xor H(g) | H(U) | s]: "+CryptoUtil.tob64(tmp.digest()));
+      }
+      K = null;
+   }
+   
+   /**
+    * @returns The exponential residue (parameter A) to be sent to the server.
+    */
+   public byte[] exponential()
+   {
+      byte[] Abytes = null;
+      if(A == null)
+      {
+         /* If the random component of A has not been specified use a random
+         number */
+         if( a == null )
+         {
+            BigInteger one = BigInteger.ONE;
+            do
+            {
+               a = new BigInteger(A_LEN, CryptoUtil.getPRNG());
+            } while(a.compareTo(one) <= 0);
+         }
+         A = g.modPow(a, N);
+         Abytes = CryptoUtil.trim(A.toByteArray());
+         // clientHash = H(N) xor H(g) | H(U) | A
+         clientHash.update(Abytes);
+         if( log.isTraceEnabled() )
+         {
+            MessageDigest tmp = CryptoUtil.copy(clientHash);
+            log.trace("H[H(N) xor H(g) | H(U) | s | A]: "+CryptoUtil.tob64(tmp.digest()));
+         }
+         // serverHash = A
+         serverHash.update(Abytes);
+      }
+      return Abytes;
+   }
+   
+   /**
+    @returns M1 = H(H(N) xor H(g) | H(U) | s | A | B | K)
+    @exception NoSuchAlgorithmException thrown if the session key
+    MessageDigest algorithm cannot be found.
+    */
+   public byte[] response(byte[] Bbytes) throws NoSuchAlgorithmException
+   {
+      // clientHash = H(N) xor H(g) | H(U) | s | A | B
+      clientHash.update(Bbytes);
+      if( log.isTraceEnabled() )
+      {
+         MessageDigest tmp = CryptoUtil.copy(clientHash);
+         log.trace("H[H(N) xor H(g) | H(U) | s | A | B]: "+CryptoUtil.tob64(tmp.digest()));
+      }
+      // Calculate u as the first 32 bits of H(B)
+      byte[] hB = CryptoUtil.newDigest().digest(Bbytes);
+      byte[] ub =
+      {hB[0], hB[1], hB[2], hB[3]};
+      // Calculate S = (B - g^x) ^ (a + u * x) % N
+      BigInteger B = new BigInteger(1, Bbytes);
+      if( log.isTraceEnabled() )
+         log.trace("B: "+CryptoUtil.tob64(B.toByteArray()));
+      if( B.compareTo(v) < 0 )
+         B = B.add(N);
+      if( log.isTraceEnabled() )
+         log.trace("B': "+CryptoUtil.tob64(B.toByteArray()));
+      if( log.isTraceEnabled() )
+         log.trace("v: "+CryptoUtil.tob64(v.toByteArray()));
+      BigInteger u = new BigInteger(1, ub);
+      if( log.isTraceEnabled() )
+         log.trace("u: "+CryptoUtil.tob64(u.toByteArray()));
+      BigInteger B_v = B.subtract(v);
+      if( log.isTraceEnabled() )
+         log.trace("B - v: "+CryptoUtil.tob64(B_v.toByteArray()));
+      BigInteger a_ux = a.add(u.multiply(x));
+      if( log.isTraceEnabled() )
+         log.trace("a + u * x: "+CryptoUtil.tob64(a_ux.toByteArray()));
+      BigInteger S = B_v.modPow(a_ux, N);
+      if( log.isTraceEnabled() )
+         log.trace("S: "+CryptoUtil.tob64(S.toByteArray()));
+      // K = SessionHash(S)
+      MessageDigest sessionDigest = MessageDigest.getInstance(params.hashAlgorithm);
+      K = sessionDigest.digest(S.toByteArray());
+      if( log.isTraceEnabled() )
+         log.trace("K: "+CryptoUtil.tob64(K));
+      // clientHash = H(N) xor H(g) | H(U) | A | B | K
+      clientHash.update(K);
+      byte[] M1 = clientHash.digest();
+      if( log.isTraceEnabled() )
+         log.trace("M1: H[H(N) xor H(g) | H(U) | s | A | B | K]: "+CryptoUtil.tob64(M1));
+      serverHash.update(M1);
+      serverHash.update(K);
+      if( log.isTraceEnabled() )
+      {
+         MessageDigest tmp = CryptoUtil.copy(serverHash);
+         log.trace("H[A | M1 | K]: "+CryptoUtil.tob64(tmp.digest()));
+      }
+      return M1;
+   }
+   /**
+    * @param M2 The server's response to the client's challenge
+    * @returns True if and only if the server's response was correct.
+    */
+   public boolean verify(byte[] M2)
+   {
+      // M2 = H(A | M1 | K)
+      byte[] myM2 = serverHash.digest();
+      boolean valid = Arrays.equals(M2, myM2);
+      if( log.isTraceEnabled() )
+      {
+         log.trace("verify serverM2: "+CryptoUtil.tob64(M2));
+         log.trace("verify M2: "+CryptoUtil.tob64(myM2));
+      }
+      return valid;
+   }
+   
+   /** Returns the negotiated session K, K = SHA_Interleave(S)
+    @return the private session K byte[]
+    @throws SecurityException - if the current thread does not have an
+    getSessionKey SRPPermission.
+    */
+   public byte[] getSessionKey() throws SecurityException
+   {
+      SecurityManager sm = System.getSecurityManager();
+      if( sm != null )
+      {
+         SRPPermission p = new SRPPermission("getSessionKey");
+         sm.checkPermission(p);
+      }
+      return K;
+   }
+}
diff --git a/src/org/jboss/security/srp/SRPConf.java b/src/org/jboss/security/srp/SRPConf.java
new file mode 100644
index 00000000..c9b69428
--- /dev/null
+++ b/src/org/jboss/security/srp/SRPConf.java
@@ -0,0 +1,113 @@
+/*
+ * JBoss, Home of Professional Open Source.
+ * Copyright 2008, Red Hat Middleware LLC, and individual contributors
+ * as indicated by the @author tags. See the copyright.txt file in the
+ * distribution for a full listing of individual contributors.
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this software; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
+ */
+package org.jboss.security.srp;
+
+import java.math.BigInteger;
+
+import org.jboss.crypto.CryptoUtil;
+
+/** A port of the libsrp/t_conf.c predefined constants for the N & g parameters
+of the SRP algorithm. It contains a collection of "good" primes for N and the
+corresponding the corresponding generator g.
+
+This product includes software developed by Tom Wu and Eugene
+Jhong for the SRP Distribution (http://srp.stanford.edu/srp/).
+
+@author Scott.Stark@jboss.org
+@version $Revision: 81038 $
+*/
+public class SRPConf
+{
+    /* Master builtin parameter storage object */
+    public static class SRPParams
+    {
+        String modb64;
+        String genb64;
+        String comment;
+        BigInteger N;
+        BigInteger g;
+        SRPParams(String modb64, String genb64, String comment)
+        {
+            this.modb64 = modb64;
+            this.genb64 = genb64;
+            this.comment = comment;
+        }
+        public byte[] Nbytes()
+        {
+            return CryptoUtil.fromb64(modb64);
+        }
+        public byte[] gbytes()
+        {
+            return CryptoUtil.fromb64(genb64);
+        }
+        public BigInteger N()
+        {
+            if( N == null )
+                N = new BigInteger(1, CryptoUtil.fromb64(modb64));
+            return N;
+        }
+        public BigInteger g()
+        {
+            if( g == null )
+                g = new BigInteger(1, CryptoUtil.fromb64(genb64));
+            return g;
+        }
+        public String getComment()
+        {
+            return comment;
+        }
+    }
+
+    static SRPParams[] pre_params = {
+        new SRPParams("3Kn/YYiomHkFkfM1x4kayR125MGkzpLUDy3y14FlTMwYnhZkjrMXnoC2TcFAecNlU5kFzgcpKYUbBOPZFRtyf3",
+            "2", null),
+        new SRPParams("CbDP.jR6YD6wAj2ByQWxQxQZ7.9J9xkn2.Uqb3zVm16vQyizprhBw9hi80psatZ8k54vwZfiIeEHZVsDnyqeWSSIpWso.wh5GD4OFgdhVI3",
+            "2", null),
+        new SRPParams("iqJ7nFZ4bGCRjE1F.FXEwL085Zb0kLM2TdHDaVVCdq0cKxvnH/0FLskJTKlDtt6sDl89dc//aEULTVFGtcbA/tDzc.bnFE.DWthQOu2n2JwKjgKfgCR2lZFWXdnWmoOh",
+            "2", null),
+        new SRPParams("///////////93zgY8MZ2DCJ6Oek0t1pHAG9E28fdp7G22xwcEnER8b5A27cED0JTxvKPiyqwGnimAmfjybyKDq/XDMrjKS95v8MrTc9UViRqJ4BffZes8F//////////",
+            "7", "oakley prime 1"),
+        new SRPParams("Ewl2hcjiutMd3Fu2lgFnUXWSc67TVyy2vwYCKoS9MLsrdJVT9RgWTCuEqWJrfB6uE3LsE9GkOlaZabS7M29sj5TnzUqOLJMjiwEzArfiLr9WbMRANlF68N5AVLcPWvNx6Zjl3m5Scp0BzJBz9TkgfhzKJZ.WtP3Mv/67I/0wmRZ",
+            "2", null),
+        new SRPParams("F//////////oG/QeY5emZJ4ncABWDmSqIa2JWYAPynq0Wk.fZiJco9HIWXvZZG4tU.L6RFDEaCRC2iARV9V53TFuJLjRL72HUI5jNPYNdx6z4n2wQOtxMiB/rosz0QtxUuuQ/jQYP.bhfya4NnB7.P9A6PHxEPJWV//////////",
+            "5", "oakley prime 2"),
+        new SRPParams("3NUKQ2Re4P5BEK0TLg2dX3gETNNNECPoe92h4OVMaDn3Xo/0QdjgG/EvM.hiVV1BdIGklSI14HA38Mpe5k04juR5/EXMU0r1WtsLhNXwKBlf2zEfoOh0zVmDvqInpU695f29Iy7sNW3U5RIogcs740oUp2Kdv5wuITwnIx84cnO.e467/IV1lPnvMCr0pd1dgS0a.RV5eBJr03Q65Xy61R",
+            "2", null),
+        new SRPParams("dUyyhxav9tgnyIg65wHxkzkb7VIPh4o0lkwfOKiPp4rVJrzLRYVBtb76gKlaO7ef5LYGEw3G.4E0jbMxcYBetDy2YdpiP/3GWJInoBbvYHIRO9uBuxgsFKTKWu7RnR7yTau/IrFTdQ4LY/q.AvoCzMxV0PKvD9Odso/LFIItn8PbTov3VMn/ZEH2SqhtpBUkWtmcIkEflhX/YY/fkBKfBbe27/zUaKUUZEUYZ2H2nlCL60.JIPeZJSzsu/xHDVcx",
+            "2", null),
+        new SRPParams("2iQzj1CagQc/5ctbuJYLWlhtAsPHc7xWVyCPAKFRLWKADpASkqe9djWPFWTNTdeJtL8nAhImCn3Sr/IAdQ1FrGw0WvQUstPx3FO9KNcXOwisOQ1VlL.gheAHYfbYyBaxXL.NcJx9TUwgWDT0hRzFzqSrdGGTN3FgSTA1v4QnHtEygNj3eZ.u0MThqWUaDiP87nqha7XnT66bkTCkQ8.7T8L4KZjIImrNrUftedTTBi.WCi.zlrBxDuOM0da0JbUkQlXqvp0yvJAPpC11nxmmZOAbQOywZGmu9nhZNuwTlxjfIro0FOdthaDTuZRL9VL7MRPUDo/DQEyW.d4H.UIlzp",
+            "2", null),
+    };
+
+    public int getPredefinedCount()
+    {
+        return pre_params.length;
+    }
+    public static SRPParams getPredefinedParams(int n)
+    {
+        return pre_params[n];
+    }
+    public static SRPParams getDefaultParams()
+    {
+        return pre_params[6];
+    }
+}
diff --git a/src/org/jboss/security/srp/SRPParameters.java b/src/org/jboss/security/srp/SRPParameters.java
new file mode 100644
index 00000000..43e2dad2
--- /dev/null
+++ b/src/org/jboss/security/srp/SRPParameters.java
@@ -0,0 +1,150 @@
+/*
+ * JBoss, Home of Professional Open Source.
+ * Copyright 2008, Red Hat Middleware LLC, and individual contributors
+ * as indicated by the @author tags. See the copyright.txt file in the
+ * distribution for a full listing of individual contributors.
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this software; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
+ */
+package org.jboss.security.srp;
+
+import java.io.Serializable;
+import java.util.Arrays;
+
+import org.jboss.crypto.CryptoUtil;
+
+/** The RFC2945 algorithm session parameters that the client and server
+agree to use. In addition to the base RFC2945 parameters, one can choose an
+alternate hash algorithm for the private session key.
+
+@author Scott.Stark@jboss.org
+@version $Revision: 81038 $
+*/
+public class SRPParameters implements Cloneable, Serializable
+{
+   /** The serial version ID.
+    * @since 1.2.4.1
+    */
+   private static final long serialVersionUID = 6438772808805276693L;
+
+   /** The algorithm safe-prime modulus */
+   public final byte[] N;
+   /** The algorithm primitive generator */
+   public final byte[] g;
+   /** The random password salt originally used to verify the password */
+   public final byte[] s;
+   /** The algorithm to hash the session key to produce K. To be consistent
+    with the RFC2945 description this must be SHA_Interleave as implemented
+    by the JBossSX security provider. For compatibility with earlier JBossSX
+    SRP releases the algorithm must be SHA_ReverseInterleave. This name is
+    passed to java.security.MessageDigest.getInstance(). */
+   public final String hashAlgorithm;
+   /** The algorithm to use for any encryption of data.
+    */
+   public final String cipherAlgorithm;
+   /** The cipher intialization vector bytes
+    */
+   public byte[] cipherIV;
+
+   /** Creates a new instance of SRPParameters */
+   public SRPParameters(byte[] N, byte[] g, byte[] s)
+   {
+      this(N, g, s, "SHA_Interleave", null);
+   }
+   public SRPParameters(byte[] N, byte[] g, byte[] s, String hashAlgorithm)
+   {
+      this(N, g, s, hashAlgorithm, null);
+   }
+   public SRPParameters(byte[] N, byte[] g, byte[] s, String hashAlgorithm,
+      String cipherAlgorithm)
+   {
+      this(N, g, s, hashAlgorithm, cipherAlgorithm, null);
+   }
+   public SRPParameters(byte[] N, byte[] g, byte[] s, String hashAlgorithm,
+      String cipherAlgorithm, byte[] cipherIV)
+   {
+      this.N = N;
+      this.g = g;
+      this.s = s;
+      if( hashAlgorithm == null )
+         hashAlgorithm = "SHA_Interleave";
+      this.hashAlgorithm = hashAlgorithm;
+      this.cipherAlgorithm = cipherAlgorithm;
+      this.cipherIV = cipherIV;
+   }
+
+   public Object clone()
+   {
+      Object clone = null;
+      try
+      {
+          clone = super.clone();
+      }
+      catch(CloneNotSupportedException e)
+      {
+      }
+      return clone;
+   }
+
+   public int hashCode()
+   {
+      int hashCode = hashAlgorithm.hashCode();
+      for(int i = 0; i < N.length; i ++)
+         hashCode += N[i];
+      for(int i = 0; i < g.length; i ++)
+         hashCode += g[i];
+      for(int i = 0; i < s.length; i ++)
+         hashCode += s[i];
+      return hashCode;
+   }
+
+   public boolean equals(Object obj)
+   {
+      boolean equals = false;
+      if( obj instanceof SRPParameters )
+      {
+         SRPParameters p = (SRPParameters) obj;
+         equals = hashAlgorithm.equals(p.hashAlgorithm);
+         if( equals == true )
+            equals = Arrays.equals(N, p.N);
+         if( equals == true )
+            equals = Arrays.equals(g, p.g);
+         if( equals == true )
+            equals = Arrays.equals(s, p.s);
+      }
+      return equals;
+   }
+
+   public String toString()
+   {
+      StringBuffer tmp = new StringBuffer(super.toString());
+      tmp.append('{');
+      tmp.append("N: ");
+      tmp.append(CryptoUtil.encodeBase64(N));
+      tmp.append("|g: ");
+      tmp.append(CryptoUtil.encodeBase64(g));
+      tmp.append("|s: ");
+      tmp.append(CryptoUtil.encodeBase64(s));
+      tmp.append("|hashAlgorithm: ");
+      tmp.append(hashAlgorithm);
+      tmp.append("|cipherAlgorithm: ");
+      tmp.append(cipherAlgorithm);
+      tmp.append("|cipherIV: ");
+      tmp.append(cipherIV);
+      tmp.append('}');
+      return tmp.toString();
+   }
+}
diff --git a/src/org/jboss/security/srp/SRPPermission.java b/src/org/jboss/security/srp/SRPPermission.java
new file mode 100644
index 00000000..d1a77d64
--- /dev/null
+++ b/src/org/jboss/security/srp/SRPPermission.java
@@ -0,0 +1,66 @@
+/*
+ * JBoss, Home of Professional Open Source.
+ * Copyright 2008, Red Hat Middleware LLC, and individual contributors
+ * as indicated by the @author tags. See the copyright.txt file in the
+ * distribution for a full listing of individual contributors.
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this software; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
+ */
+package org.jboss.security.srp;
+
+import java.security.BasicPermission;
+
+/** A custom permission class for protecting access to sensitive SRP information
+like the private session key and private key.
+
+The following table lists all the possible SRPPermission target names,
+and for each provides a description of what the permission allows
+and a discussion of the risks of granting code the permission.
+<table border=1 cellpadding=5>
+    <tr>
+        <th>Permission Target Name</th>
+        <th>What the Permission Allows</th>
+        <th>Risks of Allowing this Permission</th>
+    </tr>
+
+    <tr>
+        <td>getSessionKey</td>
+        <td>Access the private SRP session key</td>
+        <td>This provides access the the private session key that results from
+the SRP negiotation. Access to this key will allow one to encrypt/decrypt msgs
+that have been encrypted with the session key.
+        </td>
+    </tr>
+
+</table>
+
+@author Scott.Stark@jboss.org
+@version $Revision: 81038 $
+*/
+public class SRPPermission extends BasicPermission
+{
+
+    /** Creates new SRPPermission */
+    public SRPPermission(String name)
+    {
+        super(name);
+    }
+    public SRPPermission(String name, String actions)
+    {
+        super(name, actions);
+    }
+
+}
diff --git a/src/org/jboss/security/srp/SRPServerListener.java b/src/org/jboss/security/srp/SRPServerListener.java
new file mode 100644
index 00000000..a9e22cbb
--- /dev/null
+++ b/src/org/jboss/security/srp/SRPServerListener.java
@@ -0,0 +1,42 @@
+/*
+ * JBoss, Home of Professional Open Source.
+ * Copyright 2008, Red Hat Middleware LLC, and individual contributors
+ * as indicated by the @author tags. See the copyright.txt file in the
+ * distribution for a full listing of individual contributors.
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this software; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
+ */
+package org.jboss.security.srp;
+
+/** A callback interface for SRP session events.
+
+@author  Scott.Stark@jboss.org
+@version $Revision: 81038 $
+*/
+public interface SRPServerListener
+{
+   /** Called when a user has successfully completed the SRP handshake and any auxillary
+    * challenge verification.
+    * @param key, the {username, sessionID} pair
+    * @param session, the server SRP session information
+    */
+   public void verifiedUser(SRPSessionKey key, SRPServerSession session);
+   /** Called when a user requests that a session be closed
+    *
+    * @param key, the {username, sessionID} pair
+    */
+   public void closedUserSession(SRPSessionKey key);
+}
diff --git a/src/org/jboss/security/srp/SRPServerSession.java b/src/org/jboss/security/srp/SRPServerSession.java
new file mode 100644
index 00000000..11dc6d4c
--- /dev/null
+++ b/src/org/jboss/security/srp/SRPServerSession.java
@@ -0,0 +1,285 @@
+/*
+ * JBoss, Home of Professional Open Source.
+ * Copyright 2008, Red Hat Middleware LLC, and individual contributors
+ * as indicated by the @author tags. See the copyright.txt file in the
+ * distribution for a full listing of individual contributors.
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this software; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
+ */
+package org.jboss.security.srp;
+
+import java.io.Serializable;
+import java.math.BigInteger;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.Arrays;
+
+import org.jboss.logging.Logger;
+import org.jboss.crypto.CryptoUtil;
+
+/** The server side logic to the SRP protocol. The class is the server side
+ equivalent of the SRPClientSession object. An implementation of
+ SRPServerInterface creates an SRPServerSession on the start of a login
+ session.
+ 
+ The client side algorithm using these classes consists of:
+ 
+ 1. Get server, SRPServerInterface server = (SRPServerInterface) Naming.lookup(...);
+ 2. Get SRP parameters, SRPParameters params = server.getSRPParameters(username);
+ 3. Create a client session, SRPClientSession client = new SRPClientSession(username, password, params);
+ 4. Exchange public keys, byte[] A = client.exponential();
+ byte[] B = server.init(username, A);
+ 5. Exchange challenges, byte[] M1 = client.response(B);
+ byte[] M2 = server.verify(username, M1);
+ 6. Verify the server response, if( client.verify(M2) == false )
+ throw new SecurityException("Failed to validate server reply");
+ 7. Validation complete
+ 
+ Note that these steps are stateful. They must be performed in order and a
+ step cannot be repeated to update the session state.
+ 
+ This product uses the 'Secure Remote Password' cryptographic
+ authentication system developed by Tom Wu (tjw@CS.Stanford.EDU).
+ 
+ @author Scott.Stark@jboss.org
+ @version $Revision: 81038 $
+ */
+public class SRPServerSession implements Serializable
+{
+   /** The serial version ID
+    @since 1.6
+    */
+   static final long serialVersionUID = -2448005747721323704L;
+   private static int B_LEN = 64; // 64 bits for 'b'
+   private static Logger log = Logger.getLogger(SRPServerSession.class);
+
+   private SRPParameters params;
+   private BigInteger N;
+   private BigInteger g;
+   private BigInteger v;
+   private BigInteger b;
+   private BigInteger B;
+   private byte[] K;
+   /** The M1 = H(H(N) xor H(g) | H(U) | s | A | B | K) hash */
+   private transient MessageDigest clientHash;
+   private byte[] M1;
+   /** The M2 = H(A | M | K) hash */
+   private transient MessageDigest serverHash;
+   private byte[] M2;
+   
+   /** Creates a new SRP server session object from the username, password
+    verifier, and session parameters.
+    @param username, the user ID
+    @param vb, the password verifier byte sequence
+    @param params, the SRP parameters for the session
+    */
+   public SRPServerSession(String username, byte[] vb, SRPParameters params)
+   {
+      this.params = params;
+      this.v = new BigInteger(1, vb);
+      this.g = new BigInteger(1, params.g);
+      this.N = new BigInteger(1, params.N);
+      if( log.isTraceEnabled() )
+         log.trace("g: "+CryptoUtil.tob64(params.g));
+      if( log.isTraceEnabled() )
+         log.trace("v: "+CryptoUtil.tob64(vb));
+      serverHash = CryptoUtil.newDigest();
+      clientHash = CryptoUtil.newDigest();
+      // H(N)
+      byte[] hn = CryptoUtil.newDigest().digest(params.N);
+      if( log.isTraceEnabled() )
+         log.trace("H(N): "+CryptoUtil.tob64(hn));
+      // H(g)
+      byte[] hg = CryptoUtil.newDigest().digest(params.g);
+      if( log.isTraceEnabled() )
+         log.trace("H(g): "+CryptoUtil.tob64(hg));
+      // clientHash = H(N) xor H(g)
+      byte[] hxg = CryptoUtil.xor(hn, hg, 20);
+      if( log.isTraceEnabled() )
+         log.trace("H(N) xor H(g): "+CryptoUtil.tob64(hxg));
+      clientHash.update(hxg);
+      if( log.isTraceEnabled() )
+      {
+         MessageDigest tmp = CryptoUtil.copy(clientHash);
+         log.trace("H[H(N) xor H(g)]: "+CryptoUtil.tob64(tmp.digest()));
+      }
+      // clientHash = H(N) xor H(g) | H(U)
+      clientHash.update(CryptoUtil.newDigest().digest(username.getBytes()));
+      if( log.isTraceEnabled() )
+      {
+         MessageDigest tmp = CryptoUtil.copy(clientHash);
+         log.trace("H[H(N) xor H(g) | H(U)]: "+CryptoUtil.tob64(tmp.digest()));
+      }
+      // clientHash = H(N) xor H(g) | H(U) | s
+      clientHash.update(params.s);
+      if( log.isTraceEnabled() )
+      {
+         MessageDigest tmp = CryptoUtil.copy(clientHash);
+         log.trace("H[H(N) xor H(g) | H(U) | s]: "+CryptoUtil.tob64(tmp.digest()));
+      }
+      K = null;
+   }
+   
+   /**
+    * @returns The user's password salt
+    */
+   public SRPParameters getParameters()
+   {
+      return params;
+   }
+   
+   /**
+    * @returns The exponential residue (parameter B) to be sent to the
+    *          client.
+    */
+   public byte[] exponential()
+   {
+      if(B == null)
+      {
+         BigInteger one = BigInteger.valueOf(1);
+         do
+         {
+            b = new BigInteger(B_LEN, CryptoUtil.getPRNG());
+         } while(b.compareTo(one) <= 0);
+         B = v.add(g.modPow(b, N));
+         if(B.compareTo(N) >= 0)
+            B = B.subtract(N);
+      }
+      return CryptoUtil.trim(B.toByteArray());
+   }
+   
+   /**
+   @param ab The client's exponential (parameter A).
+   @returns The secret shared session K between client and server
+    @exception NoSuchAlgorithmException thrown if the session key
+    MessageDigest algorithm cannot be found.
+    */
+   public void buildSessionKey(byte[] ab) throws NoSuchAlgorithmException
+   {
+      if( log.isTraceEnabled() )
+         log.trace("A: "+CryptoUtil.tob64(ab));
+      byte[] nb = CryptoUtil.trim(B.toByteArray());
+      // clientHash = H(N) xor H(g) | H(U) | s | A
+      clientHash.update(ab);
+      if( log.isTraceEnabled() )
+      {
+         MessageDigest tmp = CryptoUtil.copy(clientHash);
+         log.trace("H[H(N) xor H(g) | H(U) | s | A]: "+CryptoUtil.tob64(tmp.digest()));
+      }
+      // clientHash = H(N) xor H(g) | H(U) | A | B
+      clientHash.update(nb);
+      if( log.isTraceEnabled() )
+      {
+         MessageDigest tmp = CryptoUtil.copy(clientHash);
+         log.trace("H[H(N) xor H(g) | H(U) | s | A | B]: "+CryptoUtil.tob64(tmp.digest()));
+      }
+      // serverHash = A
+      serverHash.update(ab);
+      // Calculate u as the first 32 bits of H(B)
+      byte[] hB = CryptoUtil.newDigest().digest(nb);
+      byte[] ub =
+      {hB[0], hB[1], hB[2], hB[3]};
+      // Calculate S = (A * v^u) ^ b % N
+      BigInteger A = new BigInteger(1, ab);
+      if( log.isTraceEnabled() )
+         log.trace("A: "+CryptoUtil.tob64(A.toByteArray()));
+      if( log.isTraceEnabled() )
+         log.trace("B: "+CryptoUtil.tob64(B.toByteArray()));
+      if( log.isTraceEnabled() )
+         log.trace("v: "+CryptoUtil.tob64(v.toByteArray()));
+      BigInteger u = new BigInteger(1, ub);
+      if( log.isTraceEnabled() )
+         log.trace("u: "+CryptoUtil.tob64(u.toByteArray()));
+      BigInteger A_v2u = A.multiply(v.modPow(u, N)).mod(N);
+      if( log.isTraceEnabled() )
+         log.trace("A * v^u: "+CryptoUtil.tob64(A_v2u.toByteArray()));
+      BigInteger S = A_v2u.modPow(b, N);
+      if( log.isTraceEnabled() )
+         log.trace("S: "+CryptoUtil.tob64(S.toByteArray()));
+      // K = SessionHash(S)
+      MessageDigest sessionDigest = MessageDigest.getInstance(params.hashAlgorithm);
+      K = sessionDigest.digest(S.toByteArray());
+      if( log.isTraceEnabled() )
+         log.trace("K: "+CryptoUtil.tob64(K));
+      // clientHash = H(N) xor H(g) | H(U) | A | B | K
+      clientHash.update(K);
+      if( log.isTraceEnabled() )
+      {
+         MessageDigest tmp = CryptoUtil.copy(clientHash);
+         log.trace("H[H(N) xor H(g) | H(U) | s | A | B | K]: "+CryptoUtil.tob64(tmp.digest()));
+      }
+   }
+   
+   /** Returns the negotiated session K, K = SessionHash(S)
+    @return the private session K byte[]
+    @throws SecurityException - if the current thread does not have an
+    getSessionKey SRPPermission.
+    */
+   public byte[] getSessionKey() throws SecurityException
+   {
+      SecurityManager sm = System.getSecurityManager();
+      if( sm != null )
+      {
+         SRPPermission p = new SRPPermission("getSessionKey");
+         sm.checkPermission(p);
+      }
+      return K;
+   }
+
+   /**
+    @returns M2 = H(A | M | K)
+    */
+   public byte[] getServerResponse()
+   {
+      if( M2 == null )
+         M2 = serverHash.digest();
+      return M2;
+   }
+   public byte[] getClientResponse()
+   {
+      return M1;
+   }
+   
+   /**
+    * @param resp The client's response to the server's challenge
+    * @returns True if and only if the client's response was correct.
+    */
+   public boolean verify(byte[] clientM1)
+   {
+      boolean valid = false;
+      // M1 = H(H(N) xor H(g) | H(U) | A | B | K)
+      M1 = clientHash.digest();
+      if( log.isTraceEnabled() )
+      {
+         log.trace("verify M1: "+CryptoUtil.tob64(M1));
+         log.trace("verify clientM1: "+CryptoUtil.tob64(clientM1));
+      }
+      if( Arrays.equals(clientM1, M1) )
+      {
+         // serverHash = A | M
+         serverHash.update(M1);
+         // serverHash = A | M | K
+         serverHash.update(K);
+         if( log.isTraceEnabled() )
+         {
+            MessageDigest tmp = CryptoUtil.copy(serverHash);
+            log.trace("H(A | M1 | K)"+CryptoUtil.tob64(tmp.digest()));
+         }
+         valid = true;
+      }
+      return valid;
+   }
+}
diff --git a/src/org/jboss/security/srp/SRPSessionKey.java b/src/org/jboss/security/srp/SRPSessionKey.java
new file mode 100644
index 00000000..e0f21310
--- /dev/null
+++ b/src/org/jboss/security/srp/SRPSessionKey.java
@@ -0,0 +1,78 @@
+/*
+ * JBoss, Home of Professional Open Source.
+ * Copyright 2008, Red Hat Middleware LLC, and individual contributors
+ * as indicated by the @author tags. See the copyright.txt file in the
+ * distribution for a full listing of individual contributors.
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this software; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
+ */
+package org.jboss.security.srp;
+
+import java.io.Serializable;
+
+/* An encapsulation of an SRP username and session id.
+ * @author Scott.Stark@jboss.org
+ * @version $Revision: 81038 $
+ */
+public class SRPSessionKey implements Serializable
+{
+   private static final long serialVersionUID = -7783783206948014409L;
+   public static final Integer NO_SESSION_ID = new Integer(0);
+   private String username;
+   private int sessionID;
+
+   public SRPSessionKey(String username)
+   {
+      this(username, NO_SESSION_ID);
+   }
+   public SRPSessionKey(String username, int sessionID)
+   {
+      this.username = username;
+      this.sessionID = sessionID;
+   }
+   public SRPSessionKey(String username, Integer sessionID)
+   {
+      this.username = username;
+      if( sessionID != null )
+         this.sessionID = sessionID.intValue();
+   }
+
+   public boolean equals(Object obj)
+   {
+      SRPSessionKey key = (SRPSessionKey) obj;
+      return this.username.equals(key.username) && this.sessionID == key.sessionID;
+   }
+
+   public int hashCode()
+   {
+      return this.username.hashCode() + this.sessionID;
+   }
+
+   public int getSessionID()
+   {
+      return sessionID;
+   }
+
+   public String getUsername()
+   {
+      return username;
+   }
+
+   public String toString()
+   {
+      return "{username="+username+", sessionID="+sessionID+"}";
+   }
+}
diff --git a/src/org/jboss/security/srp/SRPVerifierStore.java b/src/org/jboss/security/srp/SRPVerifierStore.java
new file mode 100644
index 00000000..b4487ddc
--- /dev/null
+++ b/src/org/jboss/security/srp/SRPVerifierStore.java
@@ -0,0 +1,115 @@
+/*
+ * JBoss, Home of Professional Open Source.
+ * Copyright 2008, Red Hat Middleware LLC, and individual contributors
+ * as indicated by the @author tags. See the copyright.txt file in the
+ * distribution for a full listing of individual contributors.
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this software; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
+ */
+package org.jboss.security.srp;
+
+import java.io.IOException;
+import java.io.Serializable;
+import java.io.ObjectStreamField;
+import java.security.KeyException;
+
+/** An interface describing the requirements of a password verifier store.
+This is an abstraction that allows the <username, verifier, salt> information
+needed by the server to be plugged in from various sources. E.g., LDAP
+servers, databases, files, etc.
+
+ @author Scott.Stark@jboss.org
+ @version $Revision: 81038 $
+*/
+public interface SRPVerifierStore
+{
+   public static class VerifierInfo implements Serializable
+   {
+      /** The serial version UID @since 1.2.4.1 */
+      private static final long serialVersionUID = 7420301687504271098L;
+      private static final ObjectStreamField[] serialPersistentFields = {
+         new ObjectStreamField("username", String.class),
+         new ObjectStreamField("verifier", byte[].class),
+         new ObjectStreamField("salt", byte[].class),
+         new ObjectStreamField("g", byte[].class),
+         new ObjectStreamField("N", byte[].class),
+         new ObjectStreamField("hashAlgorithm", String.class),
+         new ObjectStreamField("cipherAlgorithm", String.class),
+         new ObjectStreamField("cipherIV", byte[].class)
+      };
+
+      /** The username the information applies to. Perhaps redundant but it
+       * makes the object self contained.
+       * @serialField username String username
+       */
+      public String username;
+      /** The SRP password verifier hash
+       * @serialField verifier byte[] password verifier
+       */
+      public byte[] verifier;
+      /** The random password salt originally used to verify the password
+       * @serialField salt originally used to verify the password
+       */
+      public byte[] salt;
+      /** The SRP algorithm primitive generator
+       * @serialField g primitive generator
+       */
+      public byte[] g;
+      /** The algorithm safe-prime modulus
+       * @serialField N safe-prime modulus
+       */
+      public byte[] N;
+      /** The algorithm to hash the session key to produce K. To be consistent
+       with the RFC2945 description this must be SHA_Interleave as implemented
+       by the JBossSX security provider. For compatibility with earlier JBossSX
+       SRP releases the algorithm must be SHA_ReverseInterleave. This name is
+       passed to java.security.MessageDigest.getInstance().
+       * @serialField hashAlgorithm algorithm to hash the session key
+       * @since 1.2.4.2
+       */
+      public String hashAlgorithm;
+      /** The algorithm to use for any encryption of data.
+       * @serialField cipherAlgorithm algorithm to use for any encryption
+       * @since 1.2.4.2
+       */
+      public String cipherAlgorithm;
+      /** The initialization vector to use for any encryption of data.
+       * @serialField cipherIV initialization vector to use for any encryption
+       * @since 1.6
+       */
+      public byte[] cipherIV;
+   }
+
+    /** Get the indicated user's password verifier information.
+     */
+    public VerifierInfo getUserVerifier(String username)
+      throws KeyException, IOException;
+    /** Set the indicated users' password verifier information. This is equivalent
+     to changing a user's password and should generally invalidate any existing
+     SRP sessions and caches.
+     */
+    public void setUserVerifier(String username, VerifierInfo info)
+      throws IOException;
+
+   /** Verify an optional auxillary challenge sent from the client to the server. The
+    * auxChallenge object will have been decrypted if it was sent encrypted from the
+    * client. An example of a auxillary challenge would be the validation of a hardware
+    * token (SafeWord, SecureID, iButton) that the server validates to further strengthen
+    * the SRP password exchange.
+    */
+   public void verifyUserChallenge(String username, Object auxChallenge)
+         throws SecurityException;
+}
diff --git a/src/org/jboss/security/srp/SerialObjectStore.java b/src/org/jboss/security/srp/SerialObjectStore.java
new file mode 100644
index 00000000..3170488f
--- /dev/null
+++ b/src/org/jboss/security/srp/SerialObjectStore.java
@@ -0,0 +1,216 @@
+/*
+ * JBoss, Home of Professional Open Source.
+ * Copyright 2008, Red Hat Middleware LLC, and individual contributors
+ * as indicated by the @author tags. See the copyright.txt file in the
+ * distribution for a full listing of individual contributors.
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this software; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
+ */
+package org.jboss.security.srp;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.math.BigInteger;
+import java.security.KeyException;
+import java.security.NoSuchAlgorithmException;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.jboss.logging.Logger;
+import org.jboss.crypto.CryptoUtil;
+import org.jboss.security.srp.SRPConf;
+import org.jboss.security.srp.SRPVerifierStore;
+import org.jboss.security.srp.SRPVerifierStore.VerifierInfo;
+
+/** A simple implementation of the SRPVerifierStore that uses a
+file store made up of VerifierInfo serialized objects. Users and
+be added or removed using the addUser and delUser methods. User passwords
+are never stored in plaintext either in memory or in the serialized file.
+Note that usernames and passwords are logged when a user is added
+via the addUser operation. This is a development class and its use in
+a production environment is not advised.
+
+@see #addUser(String, String)
+@see #delUser(String)
+
+@author Scott.Stark@jboss.org
+@version $Revision: 81038 $
+*/
+public class SerialObjectStore implements SRPVerifierStore
+{
+    private static Logger log = Logger.getLogger(SerialObjectStore.class);
+    private Map infoMap;
+    private BigInteger g;
+    private BigInteger N;
+
+   /** Create an in memory store and load any VerifierInfo found in
+        ./SerialObjectStore.ser if it exists.
+    */
+    public SerialObjectStore() throws IOException
+    {
+        this(null);
+    }
+    /** Create an in memory store and load any VerifierInfo found in
+        the storeFile archive if it exists.
+    */
+    public SerialObjectStore(File storeFile) throws IOException
+    {
+        if( storeFile == null )
+            storeFile = new File("SerialObjectStore.ser");
+        if( storeFile.exists() == true )
+        {
+            FileInputStream fis = new FileInputStream(storeFile);
+            ObjectInputStream ois = new ObjectInputStream(fis);
+            try
+            {
+                infoMap = (Map) ois.readObject();
+            }
+            catch(ClassNotFoundException e)
+            {
+            }
+            ois.close();
+            fis.close();
+        }
+        else
+        {
+            infoMap = Collections.synchronizedMap(new HashMap());
+        }
+
+        try
+        {
+           CryptoUtil.init();
+        }
+        catch(NoSuchAlgorithmException e)
+        {
+            e.printStackTrace();
+            throw new IOException("Failed to initialzed security utils: "+e.getMessage());
+        }
+        N = SRPConf.getDefaultParams().N();
+        g = SRPConf.getDefaultParams().g();
+        log.trace("N: "+CryptoUtil.tob64(N.toByteArray()));
+        log.trace("g: "+CryptoUtil.tob64(g.toByteArray()));
+        byte[] hn = CryptoUtil.newDigest().digest(N.toByteArray());
+        log.trace("H(N): "+CryptoUtil.tob64(hn));
+        byte[] hg = CryptoUtil.newDigest().digest(g.toByteArray());
+        log.trace("H(g): "+CryptoUtil.tob64(hg));
+    }
+
+// --- Begin SRPVerifierStore interface methods
+    public VerifierInfo getUserVerifier(String username) throws KeyException, IOException
+    {
+        VerifierInfo info = null;
+        if( infoMap != null )
+            info = (VerifierInfo) infoMap.get(username);
+        if( info == null )
+            throw new KeyException("username: "+username+" not found");
+        return info;
+    }
+    public void setUserVerifier(String username, VerifierInfo info)
+    {
+        infoMap.put(username, info);
+    }
+
+   public void verifyUserChallenge(String username, Object auxChallenge)
+         throws SecurityException
+   {
+      throw new SecurityException("verifyUserChallenge not supported");
+   }
+// --- End SRPVerifierStore interface methods
+
+    /** Save the current in memory map of VerifierInfo to the indicated
+        storeFile by simply serializing the map to the file.
+    */
+    public void save(File storeFile) throws IOException
+    {
+        FileOutputStream fos = new FileOutputStream(storeFile);
+        ObjectOutputStream oos = new ObjectOutputStream(fos);
+        synchronized( infoMap )
+        {
+            oos.writeObject(infoMap);
+        }
+        oos.close();
+        fos.close();
+    }
+
+    public void addUser(String username, String password)
+    {
+        log.trace("addUser, username='"+username+"', password='"+password+"'");
+        VerifierInfo info = new VerifierInfo();
+        info.username = username;
+        /*
+        long r = Util.nextLong();
+        String rs = Long.toHexString(r);
+         */
+        String rs = "123456";
+        info.salt = rs.getBytes();
+        try
+        {
+           char[] pass = password.toCharArray();
+           info.verifier = CryptoUtil.calculateVerifier(username, pass,
+               info.salt, N, g);
+           info.g = g.toByteArray();
+           info.N = N.toByteArray();
+           if( log.isTraceEnabled() )
+           {
+               log.trace("N: "+CryptoUtil.tob64(info.N));
+               log.trace("g: "+CryptoUtil.tob64(info.g));
+               log.trace("s: "+CryptoUtil.tob64(info.salt));
+               byte[] xb = CryptoUtil.calculatePasswordHash(username, pass, info.salt);
+               log.trace("x: "+CryptoUtil.tob64(xb));
+               log.trace("v: "+CryptoUtil.tob64(info.verifier));
+               byte[] hn = CryptoUtil.newDigest().digest(info.N);
+               log.trace("H(N): "+CryptoUtil.tob64(hn));
+               byte[] hg = CryptoUtil.newDigest().digest(info.g);
+               log.trace("H(g): "+CryptoUtil.tob64(hg));
+           }
+        }
+        catch(Throwable t)
+        {
+           log.error("Failed to calculate verifier", t);
+           return;
+        }
+
+        setUserVerifier(username, info);
+    }
+    public void delUser(String username)
+    {
+        infoMap.remove(username);
+    }
+
+    public static void main(String[] args) throws IOException
+    {
+        File storeFile = new File("SerialObjectStore.ser");
+        SerialObjectStore store = new SerialObjectStore();
+
+        for(int a = 0; a < args.length; a ++)
+        {
+            if( args[a].startsWith("-a") )
+            {
+                store.addUser(args[a+1], args[a+2]);
+            }
+            else if( args[a].startsWith("-d") )
+            {
+                store.delUser(args[a+1]);
+            }
+        }
+        store.save(storeFile);
+    }
+}