blob: 3e9e4bc6a23b27bbda35e9cb817052c6f09f4a1d [file] [log] [blame]
package org.apache.vysper.xmpp.modules.extension.xep0220_server_dailback;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.UUID;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Hex;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.vysper.xmpp.addressing.Entity;
public class DialbackIdGenerator {
// generates a shared secret within the server
private static final String SECRET = UUID.randomUUID().toString();
private SecretKeySpec signingKey = new SecretKeySpec(DigestUtils.sha256(SECRET), "HmacSHA256");
private Mac mac;
public DialbackIdGenerator() {
try {
mac = Mac.getInstance("HmacSHA256");
mac.init(signingKey);
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
} catch (InvalidKeyException e) {
throw new RuntimeException(e);
}
}
public String generate(Entity receiving, Entity originating, String streamId) {
try {
mac.update(receiving.getDomain().getBytes("UTF-16"));
mac.update(" ".getBytes("UTF-16"));
mac.update(originating.getDomain().getBytes("UTF-16"));
mac.update(" ".getBytes("UTF-16"));
mac.update(streamId.getBytes("UTF-16"));
byte[] rawHmac = mac.doFinal();
return Hex.encodeHexString(rawHmac);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
public boolean verify(String dailbackId, Entity receiving, Entity originating, String streamId) {
return dailbackId.equals(generate(receiving, originating, streamId));
}
}