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diff --git a/src/org/jboss/security/srp/SRPClientSession.java b/src/org/jboss/security/srp/SRPClientSession.java
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-/*
- * 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;
- }
-}
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