From 0718d1fd0c5ff023edadb5f519d61a177d703656 Mon Sep 17 00:00:00 2001 From: cyBerta Date: Sat, 9 Nov 2013 20:09:24 +0100 Subject: bitmaskclient instead of leapclient in package path --- src/se/leap/leapclient/LeapSRPSession.java | 326 ----------------------------- 1 file changed, 326 deletions(-) delete mode 100644 src/se/leap/leapclient/LeapSRPSession.java (limited to 'src/se/leap/leapclient/LeapSRPSession.java') 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 . - */ - 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; - } -} -- cgit v1.2.3