mirror of
https://github.com/vanitasvitae/Smack.git
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Prepare SASL SCRAM API for other hash functions
This commit is contained in:
Florian Schmaus
parent
e71d159b96
commit
44744de003
4 changed files with 404 additions and 327 deletions
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@ -1,6 +1,6 @@
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/**
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*
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* Copyright 2014 Florian Schmaus
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* Copyright 2014-2016 Florian Schmaus
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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@ -17,73 +17,23 @@
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package org.jivesoftware.smack.sasl.core;
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import java.security.InvalidKeyException;
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import java.security.SecureRandom;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.Map;
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import javax.security.auth.callback.CallbackHandler;
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import org.jivesoftware.smack.SmackException;
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import org.jivesoftware.smack.sasl.SASLMechanism;
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import org.jivesoftware.smack.util.ByteUtils;
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import org.jivesoftware.smack.util.MAC;
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import org.jivesoftware.smack.util.SHA1;
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import org.jivesoftware.smack.util.stringencoder.Base64;
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import org.jxmpp.util.cache.Cache;
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import org.jxmpp.util.cache.LruCache;
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public class SCRAMSHA1Mechanism extends SASLMechanism {
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public class SCRAMSHA1Mechanism extends ScramMechanism {
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public static final String NAME = "SCRAM-SHA-1";
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private static final int RANDOM_ASCII_BYTE_COUNT = 32;
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private static final byte[] CLIENT_KEY_BYTES = toBytes("Client Key");
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private static final byte[] SERVER_KEY_BYTES = toBytes("Server Key");
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private static final byte[] ONE = new byte[] { 0, 0, 0, 1 };
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private static final SecureRandom RANDOM = new SecureRandom();
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private static final Cache<String, Keys> CACHE = new LruCache<String, Keys>(10);
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private enum State {
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INITIAL,
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AUTH_TEXT_SENT,
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RESPONSE_SENT,
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VALID_SERVER_RESPONSE,
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}
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/**
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* The state of the this instance of SASL SCRAM-SHA1 authentication.
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*/
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private State state = State.INITIAL;
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/**
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* The client's random ASCII which is used as nonce
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*/
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private String clientRandomAscii;
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private String clientFirstMessageBare;
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private byte[] serverSignature;
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@Override
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protected void authenticateInternal(CallbackHandler cbh) throws SmackException {
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throw new UnsupportedOperationException("CallbackHandler not (yet) supported");
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}
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@Override
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protected byte[] getAuthenticationText() throws SmackException {
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clientRandomAscii = getRandomAscii();
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String saslPrepedAuthcId = saslPrep(authenticationId);
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clientFirstMessageBare = "n=" + escape(saslPrepedAuthcId) + ",r=" + clientRandomAscii;
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String clientFirstMessage = getGS2Header() + clientFirstMessageBare;
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state = State.AUTH_TEXT_SENT;
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return toBytes(clientFirstMessage);
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}
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@Override
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public String getName() {
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return NAME;
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public SCRAMSHA1Mechanism() {
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super(new ScramHmac() {
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@Override
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public String getHmacName() {
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return "SHA-1";
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}
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@Override
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public byte[] hmac(byte[] key, byte[] str) throws InvalidKeyException {
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return MAC.hmacsha1(key, str);
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}
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});
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}
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@Override
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@ -92,269 +42,8 @@ public class SCRAMSHA1Mechanism extends SASLMechanism {
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}
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@Override
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public SCRAMSHA1Mechanism newInstance() {
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protected SASLMechanism newInstance() {
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return new SCRAMSHA1Mechanism();
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}
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@Override
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public void checkIfSuccessfulOrThrow() throws SmackException {
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if (state != State.VALID_SERVER_RESPONSE) {
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throw new SmackException("SCRAM-SHA1 is missing valid server response");
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}
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}
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@Override
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public boolean authzidSupported() {
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return true;
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}
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@Override
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protected byte[] evaluateChallenge(byte[] challenge) throws SmackException {
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final String challengeString = new String(challenge);
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switch (state) {
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case AUTH_TEXT_SENT:
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final String serverFirstMessage = challengeString;
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Map<Character, String> attributes = parseAttributes(challengeString);
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// Handle server random ASCII (nonce)
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String rvalue = attributes.get('r');
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if (rvalue == null) {
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throw new SmackException("Server random ASCII is null");
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}
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if (rvalue.length() <= clientRandomAscii.length()) {
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throw new SmackException("Server random ASCII is shorter then client random ASCII");
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}
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String receivedClientRandomAscii = rvalue.substring(0, clientRandomAscii.length());
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if (!receivedClientRandomAscii.equals(clientRandomAscii)) {
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throw new SmackException("Received client random ASCII does not match client random ASCII");
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}
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// Handle iterations
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int iterations;
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String iterationsString = attributes.get('i');
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if (iterationsString == null) {
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throw new SmackException("Iterations attribute not set");
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}
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try {
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iterations = Integer.parseInt(iterationsString);
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}
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catch (NumberFormatException e) {
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throw new SmackException("Exception parsing iterations", e);
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}
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// Handle salt
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String salt = attributes.get('s');
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if (salt == null) {
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throw new SmackException("SALT not send");
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}
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// Parsing and error checking is done, we can now begin to calculate the values
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// First the client-final-message-without-proof
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String clientFinalMessageWithoutProof = "c=" + Base64.encode(getGS2Header()) + ",r=" + rvalue;
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// AuthMessage := client-first-message-bare + "," + server-first-message + "," +
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// client-final-message-without-proof
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byte[] authMessage = toBytes(clientFirstMessageBare + ',' + serverFirstMessage + ','
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+ clientFinalMessageWithoutProof);
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// RFC 5802 § 5.1 "Note that a client implementation MAY cache ClientKey&ServerKey … for later reauthentication …
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// as it is likely that the server is going to advertise the same salt value upon reauthentication."
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final String cacheKey = password + ',' + salt;
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byte[] serverKey, clientKey;
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Keys keys = CACHE.get(cacheKey);
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if (keys == null) {
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// SaltedPassword := Hi(Normalize(password), salt, i)
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byte[] saltedPassword = hi(saslPrep(password), Base64.decode(salt), iterations);
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// ServerKey := HMAC(SaltedPassword, "Server Key")
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serverKey = hmac(saltedPassword, SERVER_KEY_BYTES);
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// ClientKey := HMAC(SaltedPassword, "Client Key")
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clientKey = hmac(saltedPassword, CLIENT_KEY_BYTES);
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keys = new Keys(clientKey, serverKey);
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CACHE.put(cacheKey, keys);
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}
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else {
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serverKey = keys.serverKey;
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clientKey = keys.clientKey;
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}
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// ServerSignature := HMAC(ServerKey, AuthMessage)
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serverSignature = hmac(serverKey, authMessage);
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// StoredKey := H(ClientKey)
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byte[] storedKey = SHA1.bytes(clientKey);
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// ClientSignature := HMAC(StoredKey, AuthMessage)
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byte[] clientSignature = hmac(storedKey, authMessage);
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// ClientProof := ClientKey XOR ClientSignature
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byte[] clientProof = new byte[clientKey.length];
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for (int i = 0; i < clientProof.length; i++) {
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clientProof[i] = (byte) (clientKey[i] ^ clientSignature[i]);
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}
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String clientFinalMessage = clientFinalMessageWithoutProof + ",p=" + Base64.encodeToString(clientProof);
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state = State.RESPONSE_SENT;
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return toBytes(clientFinalMessage);
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case RESPONSE_SENT:
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String clientCalculatedServerFinalMessage = "v=" + Base64.encodeToString(serverSignature);
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if (!clientCalculatedServerFinalMessage.equals(challengeString)) {
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throw new SmackException("Server final message does not match calculated one");
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}
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state = State.VALID_SERVER_RESPONSE;
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break;
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default:
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throw new SmackException("Invalid state");
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}
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return null;
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}
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private final String getGS2Header() {
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String authzidPortion = "";
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if (authorizationId != null) {
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authzidPortion = "a=" + authorizationId;
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}
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return "n," + authzidPortion + ",";
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}
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private static Map<Character, String> parseAttributes(String string) throws SmackException {
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if (string.length() == 0) {
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return Collections.emptyMap();
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}
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String[] keyValuePairs = string.split(",");
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Map<Character, String> res = new HashMap<Character, String>(keyValuePairs.length, 1);
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for (String keyValuePair : keyValuePairs) {
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if (keyValuePair.length() < 3) {
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throw new SmackException("Invalid Key-Value pair: " + keyValuePair);
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}
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char key = keyValuePair.charAt(0);
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if (keyValuePair.charAt(1) != '=') {
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throw new SmackException("Invalid Key-Value pair: " + keyValuePair);
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}
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String value = keyValuePair.substring(2);
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res.put(key, value);
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}
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return res;
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}
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/**
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* Generate random ASCII.
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* <p>
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* This method is non-static and package-private for unit testing purposes.
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* </p>
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* @return A String of 32 random printable ASCII characters.
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*/
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String getRandomAscii() {
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int count = 0;
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char[] randomAscii = new char[RANDOM_ASCII_BYTE_COUNT];
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while (count < RANDOM_ASCII_BYTE_COUNT) {
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int r = RANDOM.nextInt(128);
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char c = (char) r;
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// RFC 5802 § 5.1 specifies 'r:' to exclude the ',' character and to be only printable ASCII characters
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if (!isPrintableNonCommaAsciiChar(c)) {
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continue;
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}
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randomAscii[count++] = c;
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}
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return new String(randomAscii);
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}
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private static boolean isPrintableNonCommaAsciiChar(char c) {
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if (c == ',') {
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return false;
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}
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// RFC 5802 § 7. 'printable': Contains all chars within 0x21 (33d) to 0x2b (43d) and 0x2d (45d) to 0x7e (126)
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// aka. "Printable ASCII except ','". Since we already filter the ASCII ',' (0x2c, 44d) above, we only have to
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// ensure that c is within [33, 126].
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return c > 32 && c < 127;
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}
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/**
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* Escapes usernames or passwords for SASL SCRAM-SHA1.
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* <p>
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* According to RFC 5802 § 5.1 'n:'
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* "The characters ',' or '=' in usernames are sent as '=2C' and '=3D' respectively."
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* </p>
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*
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* @param string
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* @return the escaped string
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*/
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private static String escape(String string) {
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StringBuilder sb = new StringBuilder((int) (string.length() * 1.1));
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for (int i = 0; i < string.length(); i++) {
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char c = string.charAt(i);
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switch (c) {
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case ',':
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sb.append("=2C");
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break;
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case '=':
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sb.append("=3D");
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break;
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default:
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sb.append(c);
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break;
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}
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}
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return sb.toString();
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}
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/**
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* RFC 5802 § 2.2 HMAC(key, str)
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*
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* @param key
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* @param str
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* @return the HMAC-SHA1 value of the input.
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* @throws SmackException
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*/
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private static byte[] hmac(byte[] key, byte[] str) throws SmackException {
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try {
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return MAC.hmacsha1(key, str);
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}
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catch (InvalidKeyException e) {
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throw new SmackException(NAME + " HMAC-SHA1 Exception", e);
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}
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}
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/**
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* RFC 5802 § 2.2 Hi(str, salt, i)
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* <p>
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* Hi() is, essentially, PBKDF2 [RFC2898] with HMAC() as the pseudorandom function
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* (PRF) and with dkLen == output length of HMAC() == output length of H().
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* </p>
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*
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* @param str
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* @param salt
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* @param iterations
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* @return the result of the Hi function.
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* @throws SmackException
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*/
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private static byte[] hi(String str, byte[] salt, int iterations) throws SmackException {
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byte[] key = str.getBytes();
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// U1 := HMAC(str, salt + INT(1))
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byte[] u = hmac(key, ByteUtils.concact(salt, ONE));
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byte[] res = u.clone();
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for (int i = 1; i < iterations; i++) {
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u = hmac(key, u);
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for (int j = 0; j < u.length; j++) {
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res[j] ^= u[j];
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}
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}
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return res;
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}
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private static class Keys {
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private final byte[] clientKey;
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private final byte[] serverKey;
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public Keys(byte[] clientKey, byte[] serverKey) {
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this.clientKey = clientKey;
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this.serverKey = serverKey;
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}
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}
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}
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@ -0,0 +1,35 @@
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/**
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*
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* Copyright 2016 Florian Schmaus
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.sasl.core;
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import java.security.InvalidKeyException;
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public interface ScramHmac {
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String getHmacName();
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/**
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* RFC 5802 § 2.2 HMAC(key, str).
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*
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* @param key
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* @param str
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* @return the HMAC-SHA1 value of the input.
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* @throws InvalidKeyException
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*/
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byte[] hmac(byte[] key, byte[] str) throws InvalidKeyException;
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}
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@ -0,0 +1,353 @@
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/**
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*
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* Copyright 2014-2016 Florian Schmaus
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
|
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
|
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* distributed under the License is distributed on an "AS IS" BASIS,
|
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
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* limitations under the License.
|
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*/
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package org.jivesoftware.smack.sasl.core;
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import java.security.InvalidKeyException;
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import java.security.SecureRandom;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.Map;
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import javax.security.auth.callback.CallbackHandler;
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import org.jivesoftware.smack.SmackException;
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import org.jivesoftware.smack.sasl.SASLMechanism;
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import org.jivesoftware.smack.util.ByteUtils;
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import org.jivesoftware.smack.util.SHA1;
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import org.jivesoftware.smack.util.stringencoder.Base64;
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import org.jxmpp.util.cache.Cache;
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import org.jxmpp.util.cache.LruCache;
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public abstract class ScramMechanism extends SASLMechanism {
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private static final int RANDOM_ASCII_BYTE_COUNT = 32;
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private static final byte[] CLIENT_KEY_BYTES = toBytes("Client Key");
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private static final byte[] SERVER_KEY_BYTES = toBytes("Server Key");
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private static final byte[] ONE = new byte[] { 0, 0, 0, 1 };
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private static final SecureRandom RANDOM = new SecureRandom();
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private static final Cache<String, Keys> CACHE = new LruCache<String, Keys>(10);
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private final ScramHmac scramHmac;
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protected ScramMechanism(ScramHmac scramHmac) {
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this.scramHmac = scramHmac;
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}
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private enum State {
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INITIAL,
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AUTH_TEXT_SENT,
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RESPONSE_SENT,
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VALID_SERVER_RESPONSE,
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}
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/**
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* The state of the this instance of SASL SCRAM-SHA1 authentication.
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*/
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private State state = State.INITIAL;
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/**
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* The client's random ASCII which is used as nonce
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*/
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private String clientRandomAscii;
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private String clientFirstMessageBare;
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private byte[] serverSignature;
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@Override
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protected void authenticateInternal(CallbackHandler cbh) throws SmackException {
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throw new UnsupportedOperationException("CallbackHandler not (yet) supported");
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}
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@Override
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protected byte[] getAuthenticationText() throws SmackException {
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clientRandomAscii = getRandomAscii();
|
||||
String saslPrepedAuthcId = saslPrep(authenticationId);
|
||||
clientFirstMessageBare = "n=" + escape(saslPrepedAuthcId) + ",r=" + clientRandomAscii;
|
||||
String clientFirstMessage = getGS2Header() + clientFirstMessageBare;
|
||||
state = State.AUTH_TEXT_SENT;
|
||||
return toBytes(clientFirstMessage);
|
||||
}
|
||||
|
||||
@Override
|
||||
public String getName() {
|
||||
String name = "SCRAM-" + scramHmac.getHmacName();
|
||||
return name;
|
||||
}
|
||||
|
||||
@Override
|
||||
public void checkIfSuccessfulOrThrow() throws SmackException {
|
||||
if (state != State.VALID_SERVER_RESPONSE) {
|
||||
throw new SmackException("SCRAM-SHA1 is missing valid server response");
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean authzidSupported() {
|
||||
return true;
|
||||
}
|
||||
|
||||
@Override
|
||||
protected byte[] evaluateChallenge(byte[] challenge) throws SmackException {
|
||||
final String challengeString = new String(challenge);
|
||||
switch (state) {
|
||||
case AUTH_TEXT_SENT:
|
||||
final String serverFirstMessage = challengeString;
|
||||
Map<Character, String> attributes = parseAttributes(challengeString);
|
||||
|
||||
// Handle server random ASCII (nonce)
|
||||
String rvalue = attributes.get('r');
|
||||
if (rvalue == null) {
|
||||
throw new SmackException("Server random ASCII is null");
|
||||
}
|
||||
if (rvalue.length() <= clientRandomAscii.length()) {
|
||||
throw new SmackException("Server random ASCII is shorter then client random ASCII");
|
||||
}
|
||||
String receivedClientRandomAscii = rvalue.substring(0, clientRandomAscii.length());
|
||||
if (!receivedClientRandomAscii.equals(clientRandomAscii)) {
|
||||
throw new SmackException("Received client random ASCII does not match client random ASCII");
|
||||
}
|
||||
|
||||
// Handle iterations
|
||||
int iterations;
|
||||
String iterationsString = attributes.get('i');
|
||||
if (iterationsString == null) {
|
||||
throw new SmackException("Iterations attribute not set");
|
||||
}
|
||||
try {
|
||||
iterations = Integer.parseInt(iterationsString);
|
||||
}
|
||||
catch (NumberFormatException e) {
|
||||
throw new SmackException("Exception parsing iterations", e);
|
||||
}
|
||||
|
||||
// Handle salt
|
||||
String salt = attributes.get('s');
|
||||
if (salt == null) {
|
||||
throw new SmackException("SALT not send");
|
||||
}
|
||||
|
||||
// Parsing and error checking is done, we can now begin to calculate the values
|
||||
|
||||
// First the client-final-message-without-proof
|
||||
String clientFinalMessageWithoutProof = "c=" + Base64.encode(getGS2Header()) + ",r=" + rvalue;
|
||||
|
||||
// AuthMessage := client-first-message-bare + "," + server-first-message + "," +
|
||||
// client-final-message-without-proof
|
||||
byte[] authMessage = toBytes(clientFirstMessageBare + ',' + serverFirstMessage + ','
|
||||
+ clientFinalMessageWithoutProof);
|
||||
|
||||
// RFC 5802 § 5.1 "Note that a client implementation MAY cache ClientKey&ServerKey … for later reauthentication …
|
||||
// as it is likely that the server is going to advertise the same salt value upon reauthentication."
|
||||
final String cacheKey = password + ',' + salt;
|
||||
byte[] serverKey, clientKey;
|
||||
Keys keys = CACHE.get(cacheKey);
|
||||
if (keys == null) {
|
||||
// SaltedPassword := Hi(Normalize(password), salt, i)
|
||||
byte[] saltedPassword = hi(saslPrep(password), Base64.decode(salt), iterations);
|
||||
|
||||
// ServerKey := HMAC(SaltedPassword, "Server Key")
|
||||
serverKey = hmac(saltedPassword, SERVER_KEY_BYTES);
|
||||
|
||||
// ClientKey := HMAC(SaltedPassword, "Client Key")
|
||||
clientKey = hmac(saltedPassword, CLIENT_KEY_BYTES);
|
||||
|
||||
keys = new Keys(clientKey, serverKey);
|
||||
CACHE.put(cacheKey, keys);
|
||||
}
|
||||
else {
|
||||
serverKey = keys.serverKey;
|
||||
clientKey = keys.clientKey;
|
||||
}
|
||||
|
||||
// ServerSignature := HMAC(ServerKey, AuthMessage)
|
||||
serverSignature = hmac(serverKey, authMessage);
|
||||
|
||||
// StoredKey := H(ClientKey)
|
||||
byte[] storedKey = SHA1.bytes(clientKey);
|
||||
|
||||
// ClientSignature := HMAC(StoredKey, AuthMessage)
|
||||
byte[] clientSignature = hmac(storedKey, authMessage);
|
||||
|
||||
// ClientProof := ClientKey XOR ClientSignature
|
||||
byte[] clientProof = new byte[clientKey.length];
|
||||
for (int i = 0; i < clientProof.length; i++) {
|
||||
clientProof[i] = (byte) (clientKey[i] ^ clientSignature[i]);
|
||||
}
|
||||
|
||||
String clientFinalMessage = clientFinalMessageWithoutProof + ",p=" + Base64.encodeToString(clientProof);
|
||||
state = State.RESPONSE_SENT;
|
||||
return toBytes(clientFinalMessage);
|
||||
case RESPONSE_SENT:
|
||||
String clientCalculatedServerFinalMessage = "v=" + Base64.encodeToString(serverSignature);
|
||||
if (!clientCalculatedServerFinalMessage.equals(challengeString)) {
|
||||
throw new SmackException("Server final message does not match calculated one");
|
||||
}
|
||||
state = State.VALID_SERVER_RESPONSE;
|
||||
break;
|
||||
default:
|
||||
throw new SmackException("Invalid state");
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
private final String getGS2Header() {
|
||||
String authzidPortion = "";
|
||||
if (authorizationId != null) {
|
||||
authzidPortion = "a=" + authorizationId;
|
||||
}
|
||||
return "n," + authzidPortion + ",";
|
||||
}
|
||||
|
||||
private static Map<Character, String> parseAttributes(String string) throws SmackException {
|
||||
if (string.length() == 0) {
|
||||
return Collections.emptyMap();
|
||||
}
|
||||
|
||||
String[] keyValuePairs = string.split(",");
|
||||
Map<Character, String> res = new HashMap<Character, String>(keyValuePairs.length, 1);
|
||||
for (String keyValuePair : keyValuePairs) {
|
||||
if (keyValuePair.length() < 3) {
|
||||
throw new SmackException("Invalid Key-Value pair: " + keyValuePair);
|
||||
}
|
||||
char key = keyValuePair.charAt(0);
|
||||
if (keyValuePair.charAt(1) != '=') {
|
||||
throw new SmackException("Invalid Key-Value pair: " + keyValuePair);
|
||||
}
|
||||
String value = keyValuePair.substring(2);
|
||||
res.put(key, value);
|
||||
}
|
||||
|
||||
return res;
|
||||
}
|
||||
|
||||
/**
|
||||
* Generate random ASCII.
|
||||
* <p>
|
||||
* This method is non-static and package-private for unit testing purposes.
|
||||
* </p>
|
||||
* @return A String of 32 random printable ASCII characters.
|
||||
*/
|
||||
String getRandomAscii() {
|
||||
int count = 0;
|
||||
char[] randomAscii = new char[RANDOM_ASCII_BYTE_COUNT];
|
||||
while (count < RANDOM_ASCII_BYTE_COUNT) {
|
||||
int r = RANDOM.nextInt(128);
|
||||
char c = (char) r;
|
||||
// RFC 5802 § 5.1 specifies 'r:' to exclude the ',' character and to be only printable ASCII characters
|
||||
if (!isPrintableNonCommaAsciiChar(c)) {
|
||||
continue;
|
||||
}
|
||||
randomAscii[count++] = c;
|
||||
}
|
||||
return new String(randomAscii);
|
||||
}
|
||||
|
||||
private static boolean isPrintableNonCommaAsciiChar(char c) {
|
||||
if (c == ',') {
|
||||
return false;
|
||||
}
|
||||
// RFC 5802 § 7. 'printable': Contains all chars within 0x21 (33d) to 0x2b (43d) and 0x2d (45d) to 0x7e (126)
|
||||
// aka. "Printable ASCII except ','". Since we already filter the ASCII ',' (0x2c, 44d) above, we only have to
|
||||
// ensure that c is within [33, 126].
|
||||
return c > 32 && c < 127;
|
||||
}
|
||||
|
||||
/**
|
||||
* Escapes usernames or passwords for SASL SCRAM-SHA1.
|
||||
* <p>
|
||||
* According to RFC 5802 § 5.1 'n:'
|
||||
* "The characters ',' or '=' in usernames are sent as '=2C' and '=3D' respectively."
|
||||
* </p>
|
||||
*
|
||||
* @param string
|
||||
* @return the escaped string
|
||||
*/
|
||||
private static String escape(String string) {
|
||||
StringBuilder sb = new StringBuilder((int) (string.length() * 1.1));
|
||||
for (int i = 0; i < string.length(); i++) {
|
||||
char c = string.charAt(i);
|
||||
switch (c) {
|
||||
case ',':
|
||||
sb.append("=2C");
|
||||
break;
|
||||
case '=':
|
||||
sb.append("=3D");
|
||||
break;
|
||||
default:
|
||||
sb.append(c);
|
||||
break;
|
||||
}
|
||||
}
|
||||
return sb.toString();
|
||||
}
|
||||
|
||||
/**
|
||||
* RFC 5802 § 2.2 HMAC(key, str)
|
||||
*
|
||||
* @param key
|
||||
* @param str
|
||||
* @return the HMAC-SHA1 value of the input.
|
||||
* @throws SmackException
|
||||
*/
|
||||
private byte[] hmac(byte[] key, byte[] str) throws SmackException {
|
||||
try {
|
||||
return scramHmac.hmac(key, str);
|
||||
}
|
||||
catch (InvalidKeyException e) {
|
||||
throw new SmackException(getName() + " Exception", e);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* RFC 5802 § 2.2 Hi(str, salt, i)
|
||||
* <p>
|
||||
* Hi() is, essentially, PBKDF2 [RFC2898] with HMAC() as the pseudorandom function
|
||||
* (PRF) and with dkLen == output length of HMAC() == output length of H().
|
||||
* </p>
|
||||
*
|
||||
* @param str
|
||||
* @param salt
|
||||
* @param iterations
|
||||
* @return the result of the Hi function.
|
||||
* @throws SmackException
|
||||
*/
|
||||
private byte[] hi(String str, byte[] salt, int iterations) throws SmackException {
|
||||
byte[] key = str.getBytes();
|
||||
// U1 := HMAC(str, salt + INT(1))
|
||||
byte[] u = hmac(key, ByteUtils.concact(salt, ONE));
|
||||
byte[] res = u.clone();
|
||||
for (int i = 1; i < iterations; i++) {
|
||||
u = hmac(key, u);
|
||||
for (int j = 0; j < u.length; j++) {
|
||||
res[j] ^= u[j];
|
||||
}
|
||||
}
|
||||
return res;
|
||||
}
|
||||
|
||||
private static class Keys {
|
||||
private final byte[] clientKey;
|
||||
private final byte[] serverKey;
|
||||
|
||||
public Keys(byte[] clientKey, byte[] serverKey) {
|
||||
this.clientKey = clientKey;
|
||||
this.serverKey = serverKey;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -1,6 +1,6 @@
|
|||
/**
|
||||
*
|
||||
* Copyright 2014 Florian Schmaus
|
||||
* Copyright 2014-2016 Florian Schmaus
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
|
|
@ -50,7 +50,7 @@ public class SCRAMSHA1MechanismTest extends SmackTestSuite {
|
|||
|
||||
mech.authenticate(USERNAME, "unusedFoo", JidTestUtil.DOMAIN_BARE_JID_1, PASSWORD, null);
|
||||
AuthMechanism authMechanism = con.getSentPacket();
|
||||
assertEquals(SCRAMSHA1Mechanism.NAME, authMechanism.getMechanism());
|
||||
assertEquals((new SCRAMSHA1Mechanism().getName()), authMechanism.getMechanism());
|
||||
assertEquals(CLIENT_FIRST_MESSAGE, saslLayerString(authMechanism.getAuthenticationText()));
|
||||
|
||||
mech.challengeReceived(Base64.encode(SERVER_FIRST_MESSAGE), false);
|
||||
|
|
|
|||
Loading…
Reference in a new issue