1 files changed, 0 insertions, 326 deletions
diff --git a/src/se/leap/leapclient/LeapSRPSession.java b/src/se/leap/leapclient/LeapSRPSession.java
deleted file mode 100644
index 5a78219b..00000000
--- a/src/se/leap/leapclient/LeapSRPSession.java
+++ /dev/null
@@ -1,326 +0,0 @@
-/**
- * Copyright (c) 2013 LEAP Encryption Access Project and contributers
- * 
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
- package se.leap.leapclient;
-
-import java.io.UnsupportedEncodingException;
-import java.math.BigInteger;
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
-import java.security.SecureRandom;
-import java.util.Arrays;
-
-import org.jboss.security.srp.SRPParameters;
-
-/**
- * Implements all SRP algorithm logic.
- * 
- * It's derived from JBoss implementation, with adjustments to make it work with LEAP platform.
- * 
- * @author parmegv
- *
- */
-public class LeapSRPSession {
-	
-	final public static String SALT = "salt";
-	final public static String M1 = "M1";
-	final public static String M2 = "M2";
-
-	private SRPParameters params;
-	private String username;
-	private String password;
-	private BigInteger N;
-	private byte[] N_bytes;
-	private BigInteger g;
-	private BigInteger x;
-	private BigInteger v;
-	private BigInteger a;
-	private BigInteger A;
-	private byte[] K;
-	private SecureRandom pseudoRng;
-	/** 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;
-
-	/** 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 LeapSRPSession(String username, String 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
-	 */
-	public LeapSRPSession(String username, String password, SRPParameters params,
-			byte[] abytes) {
-		this.params = params;
-		this.g = new BigInteger(1, params.g);
-		N_bytes = ConfigHelper.trim(params.N);
-		this.N = new BigInteger(1, N_bytes);
-		this.username = username;
-		this.password = password;
-		
-		try {
-			pseudoRng = SecureRandom.getInstance("SHA1PRNG");
-		} catch (NoSuchAlgorithmException e) {
-			// TODO Auto-generated catch block
-			e.printStackTrace();
-		}
-		
-		if( abytes != null ) {
-			A_LEN = 8*abytes.length;
-			/* TODO Why did they put this condition?
-	         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);
-		}
-		else
-			A_LEN = 64;
-
-		serverHash = newDigest();
-		clientHash = newDigest();
-	}
-
-	/**
-	 * Calculates the parameter x of the SRP-6a algorithm.
-	 * @param username
-	 * @param password
-	 * @param salt the salt of the user
-	 * @return x
-	 */
-	public byte[] calculatePasswordHash(String username, String password, byte[] salt)
-	{
-		//password = password.replaceAll("\\\\", "\\\\\\\\");
-		// Calculate x = H(s | H(U | ':' | password))
-		MessageDigest x_digest = newDigest();
-		// Try to convert the username to a byte[] using ISO-8859-1
-		byte[] user = null;
-		byte[] password_bytes = null;
-		byte[] colon = {};
-		String encoding = "ISO-8859-1";
-		try {
-			user = ConfigHelper.trim(username.getBytes(encoding));
-			colon = ConfigHelper.trim(":".getBytes(encoding));
-			password_bytes = ConfigHelper.trim(password.getBytes(encoding));
-		}
-		catch(UnsupportedEncodingException e) {
-			// Use the default platform encoding
-			user = ConfigHelper.trim(username.getBytes());
-			colon = ConfigHelper.trim(":".getBytes());
-			password_bytes = ConfigHelper.trim(password.getBytes());
-		}
-		
-		// Build the hash
-		x_digest.update(user);
-		x_digest.update(colon);
-		x_digest.update(password_bytes);
-		byte[] h = x_digest.digest();
-		
-		x_digest.reset();
-		x_digest.update(salt);
-		x_digest.update(h);
-		byte[] x_digest_bytes = x_digest.digest();
-
-		return x_digest_bytes;
-	}
-
-	/**
-	 * Calculates the parameter V of the SRP-6a algorithm.
-	 * @param k_string constant k predefined by the SRP server implementation.
-	 * @return the value of V
-	 */
-	private BigInteger calculateV(String k_string) {
-		BigInteger k = new BigInteger(k_string, 16);
-		BigInteger v = k.multiply(g.modPow(x, N));  // g^x % N
-		return v;
-	}
-
-	/**
-	 * Calculates the trimmed xor from two BigInteger numbers
-	 * @param b1 the positive source to build first BigInteger
-	 * @param b2 the positive source to build second BigInteger
-	 * @param length 
-	 * @return
-	 */
-	public byte[] xor(byte[] b1, byte[] b2)
-	{
-		//TODO Check if length matters in the order, when b2 is smaller than b1 or viceversa
-		byte[] xor_digest = new BigInteger(1, b1).xor(new BigInteger(1, b2)).toByteArray();
-		return ConfigHelper.trim(xor_digest);
-	}
-
-	/**
-	 * @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, pseudoRng);
-				} while(a.compareTo(one) <= 0);
-			}
-			A = g.modPow(a, N);
-			Abytes = ConfigHelper.trim(A.toByteArray());
-		}
-		return Abytes;
-	}
-
-	/**
-	 * Calculates the parameter M1, to be sent to the SRP server.
-	 * It also updates hashes of client and server for further calculations in other methods.
-	 * It uses a predefined k.
-	 * @param salt_bytes
-	 * @param Bbytes the parameter received from the server, in bytes
-	 * @return the parameter M1
-	 * @throws NoSuchAlgorithmException
-	 */
-	public byte[] response(byte[] salt_bytes, byte[] Bbytes) throws NoSuchAlgorithmException {
-		// Calculate x = H(s | H(U | ':' | password))
-		byte[] xb = calculatePasswordHash(username, password, ConfigHelper.trim(salt_bytes));
-		this.x = new BigInteger(1, xb);
-
-		// Calculate v = kg^x mod N
-		String k_string = "bf66c44a428916cad64aa7c679f3fd897ad4c375e9bbb4cbf2f5de241d618ef0";
-		this.v = calculateV(k_string);
-
-		// H(N)
-		byte[] digest_of_n = newDigest().digest(N_bytes);
-		
-		// H(g)
-		byte[] digest_of_g = newDigest().digest(params.g);
-		
-		// clientHash = H(N) xor H(g)
-		byte[] xor_digest = xor(digest_of_n, digest_of_g);
-		clientHash.update(xor_digest);
-		
-		// clientHash = H(N) xor H(g) | H(U)
-		byte[] username_digest = newDigest().digest(ConfigHelper.trim(username.getBytes()));
-		username_digest = ConfigHelper.trim(username_digest);
-		clientHash.update(username_digest);
-		
-		// clientHash = H(N) xor H(g) | H(U) | s
-		clientHash.update(ConfigHelper.trim(salt_bytes));
-		
-		K = null;
-
-		// clientHash = H(N) xor H(g) | H(U) | A
-		byte[] Abytes = ConfigHelper.trim(A.toByteArray());
-		clientHash.update(Abytes);
-		
-		// clientHash = H(N) xor H(g) | H(U) | s | A | B
-		Bbytes = ConfigHelper.trim(Bbytes);
-		clientHash.update(Bbytes);
-		
-		// Calculate S = (B - kg^x) ^ (a + u * x) % N
-		BigInteger S = calculateS(Bbytes);
-		byte[] S_bytes = ConfigHelper.trim(S.toByteArray());
-
-		// K = SessionHash(S)
-		String hash_algorithm = params.hashAlgorithm;
-		MessageDigest sessionDigest = MessageDigest.getInstance(hash_algorithm);
-		K = ConfigHelper.trim(sessionDigest.digest(S_bytes));
-		
-		// clientHash = H(N) xor H(g) | H(U) | A | B | K
-		clientHash.update(K);
-		
-		byte[] M1 = ConfigHelper.trim(clientHash.digest());
-		
-		// serverHash = Astr + M + K
-		serverHash.update(Abytes);
-		serverHash.update(M1);
-		serverHash.update(K);
-		
-		return M1;
-	}
-
-	/**
-	 * It calculates the parameter S used by response() to obtain session hash K.
-	 * @param Bbytes the parameter received from the server, in bytes
-	 * @return the parameter S
-	 */
-	private BigInteger calculateS(byte[] Bbytes) {
-		byte[] Abytes = ConfigHelper.trim(A.toByteArray());
-		Bbytes = ConfigHelper.trim(Bbytes);
-		byte[] u_bytes = getU(Abytes, Bbytes);
-		
-		BigInteger B = new BigInteger(1, Bbytes);
-		BigInteger u = new BigInteger(1, u_bytes);
-		
-		BigInteger B_minus_v = B.subtract(v);
-		BigInteger a_ux = a.add(u.multiply(x));
-		BigInteger S = B_minus_v.modPow(a_ux, N);
-		return S;
-	}
-
-	/**
-	 * It calculates the parameter u used by calculateS to obtain S.
-	 * @param Abytes the exponential residue sent to the server
-	 * @param Bbytes the parameter received from the server, in bytes
-	 * @return
-	 */
-	public byte[] getU(byte[] Abytes, byte[] Bbytes) {
-		MessageDigest u_digest = newDigest();
-		u_digest.update(ConfigHelper.trim(Abytes));
-		u_digest.update(ConfigHelper.trim(Bbytes));
-		byte[] u_digest_bytes = u_digest.digest();
-		return ConfigHelper.trim(new BigInteger(1, u_digest_bytes).toByteArray());
-	}
-
-	/**
-	 * @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)
-		M2 = ConfigHelper.trim(M2);
-		byte[] myM2 = ConfigHelper.trim(serverHash.digest());
-		boolean valid = Arrays.equals(M2, myM2);
-		return valid;
-	}
-
-	/**
-	 * @return a new SHA-256 digest.
-	 */
-	public MessageDigest newDigest()
-	{
-		MessageDigest md = null;
-		try {
-			md = MessageDigest.getInstance("SHA-256");
-		} catch (NoSuchAlgorithmException e) {
-			e.printStackTrace();
-		}
-		return md;
-	}
-}