92 lines
3 KiB
Java
92 lines
3 KiB
Java
package eu.siacs.conversations.crypto.sasl;
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import android.util.Base64;
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import java.math.BigInteger;
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import java.nio.charset.Charset;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import java.security.SecureRandom;
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import eu.siacs.conversations.entities.Account;
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import eu.siacs.conversations.utils.CryptoHelper;
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import eu.siacs.conversations.xml.TagWriter;
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public class DigestMd5 extends SaslMechanism {
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public DigestMd5(final TagWriter tagWriter, final Account account, final SecureRandom rng) {
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super(tagWriter, account, rng);
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}
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@Override
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public int getPriority() {
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return 10;
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}
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@Override
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public String getMechanism() {
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return "DIGEST-MD5";
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}
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private State state = State.INITIAL;
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@Override
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public String getResponse(final String challenge) throws AuthenticationException {
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switch (state) {
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case INITIAL:
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state = State.RESPONSE_SENT;
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final String encodedResponse;
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try {
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final Tokenizer tokenizer = new Tokenizer(Base64.decode(challenge, Base64.DEFAULT));
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String nonce = "";
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for (final String token : tokenizer) {
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final String[] parts = token.split("=", 2);
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if (parts[0].equals("nonce")) {
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nonce = parts[1].replace("\"", "");
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} else if (parts[0].equals("rspauth")) {
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return "";
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}
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}
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final String digestUri = "xmpp/" + account.getServer();
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final String nonceCount = "00000001";
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final String x = account.getUsername() + ":" + account.getServer() + ":"
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+ account.getPassword();
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final MessageDigest md = MessageDigest.getInstance("MD5");
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final byte[] y = md.digest(x.getBytes(Charset.defaultCharset()));
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final String cNonce = new BigInteger(100, rng).toString(32);
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final byte[] a1 = CryptoHelper.concatenateByteArrays(y,
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(":" + nonce + ":" + cNonce).getBytes(Charset.defaultCharset()));
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final String a2 = "AUTHENTICATE:" + digestUri;
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final String ha1 = CryptoHelper.bytesToHex(md.digest(a1));
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final String ha2 = CryptoHelper.bytesToHex(md.digest(a2.getBytes(Charset
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.defaultCharset())));
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final String kd = ha1 + ":" + nonce + ":" + nonceCount + ":" + cNonce
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+ ":auth:" + ha2;
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final String response = CryptoHelper.bytesToHex(md.digest(kd.getBytes(Charset
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.defaultCharset())));
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final String saslString = "username=\"" + account.getUsername()
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+ "\",realm=\"" + account.getServer() + "\",nonce=\""
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+ nonce + "\",cnonce=\"" + cNonce + "\",nc=" + nonceCount
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+ ",qop=auth,digest-uri=\"" + digestUri + "\",response="
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+ response + ",charset=utf-8";
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encodedResponse = Base64.encodeToString(
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saslString.getBytes(Charset.defaultCharset()),
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Base64.NO_WRAP);
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} catch (final NoSuchAlgorithmException e) {
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throw new AuthenticationException(e);
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}
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return encodedResponse;
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case RESPONSE_SENT:
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state = State.VALID_SERVER_RESPONSE;
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break;
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case VALID_SERVER_RESPONSE:
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if (challenge==null) {
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return null; //everything is fine
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}
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default:
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throw new InvalidStateException(state);
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}
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return null;
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}
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}
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