Example usage for org.bouncycastle.util.encoders Hex Hex

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In this page you can find the example usage for org.bouncycastle.util.encoders Hex Hex.

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From source file:cc.telepath.phage.PhageGroup.java

License:GNU General Public License

/**
 * Establish a secure channel with a specific PhageIdentity.
 * The original contact point is determinitstic - take the hash of both keys concatenatd in descending order.
 * Return the secret channel being used to share the current communication AES keys.
 * @param i//from  w ww .  j a v  a  2s .  c om
 * @return secretchannel
 */
public String advertiseChannel(PhageIdentity i, PhageFCPClient pcl)
        throws IOException, FcpException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException,
        BadPaddingException, IllegalBlockSizeException, SignatureException {
    Base64 base64 = new Base64();
    Hex hex = new Hex();
    String ownkey = new String(base64.encode(this.PublicKey.getEncoded()));
    String identkey = new String(base64.encode(i.getPubkey().getEncoded()));

    String combination = null;
    if (ownkey.compareTo(identkey) < 0) {
        combination = ownkey + identkey;
    } else {
        combination = identkey + ownkey;
    }

    // Generate a 100 character random KSK for us to meet at
    RandomStringUtils rsu = new RandomStringUtils();
    String channel = rsu.randomAlphanumeric(100);

    Cipher cipher = Cipher.getInstance(i.getPubkey().getAlgorithm());
    cipher.init(Cipher.ENCRYPT_MODE, i.getPubkey());
    String secretchannel = "KSK@" + channel;
    byte[] encryptData = cipher.doFinal(secretchannel.getBytes());

    Signature sig = Signature.getInstance("SHA512withRSA");
    sig.initSign(PrivateKey);
    sig.update(new String(base64.encode(encryptData)).getBytes());
    byte[] signatureBytes = sig.sign();
    String encryptedMessage = new String(base64.encode(encryptData));
    String signature = new String(base64.encode(signatureBytes));

    MessageDigest md = MessageDigest.getInstance("SHA-512");
    md.update(combination.getBytes());
    byte[] rendezvousbytes = md.digest();

    String rendezvous = new String(hex.encode(rendezvousbytes));
    String URI = pcl.putData(rendezvous, (encryptedMessage + ":" + signature).getBytes(), null, null,
            "text/plain", false);
    this.privateChannels.put(i.getFreenetPubkey(), secretchannel);
    return secretchannel;
}

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From source file:cc.telepath.phage.PhageIdentity.java

License:GNU General Public License

/**
 * Discover a secret channel that has been announced to our key.
 * @param PhageGroupPubKey//from  w  w w  .j av  a 2  s .  c o  m
 * @param pcl
 * @return
 * @throws IOException
 * @throws FcpException
 * @throws IllegalBlockSizeException
 * @throws BadPaddingException
 * @throws NoSuchPaddingException
 * @throws NoSuchAlgorithmException
 * @throws InvalidKeyException
 */
public void discoverSecretChannel(String PhageGroupPubKey, PhageFCPClient pcl) throws InvalidSigException,
        IOException, FcpException, IllegalBlockSizeException, BadPaddingException, NoSuchPaddingException,
        NoSuchAlgorithmException, InvalidKeyException, InvalidKeySpecException, SignatureException {
    Base64 base64 = new Base64();
    Hex hex = new Hex();
    Crypto c = new Crypto();
    String ownkey = new String(base64.encode(this.pubKey.getEncoded()));
    String combination;
    if (PhageGroupPubKey.compareTo(ownkey) < 0) {
        combination = PhageGroupPubKey + ownkey;
    } else {
        combination = ownkey + PhageGroupPubKey;
    }
    MessageDigest md = MessageDigest.getInstance("SHA-512");
    md.update(combination.getBytes());
    byte[] rendezvousbytes = md.digest();
    String rendezvous = "KSK@" + new String(hex.encode(rendezvousbytes));
    String secretChannelAnnouncement = new String(pcl.getData(rendezvous));
    KeyFactory kf = KeyFactory.getInstance("RSA");
    PublicKey groupPk = kf.generatePublic(new X509EncodedKeySpec(base64.decode(PhageGroupPubKey)));
    boolean sigValid = c.sigValid(secretChannelAnnouncement.split(":")[0],
            secretChannelAnnouncement.split(":")[1], groupPk);
    String message = c.decryptMessage(this.getPrivkey(), secretChannelAnnouncement.split(":")[0]);
    System.out.println("SecretChannel: " + message);
    if (!sigValid) {
        throw new InvalidSigException("The message signature from " + PhageGroupPubKey
                + "failed!! Either invalid data was provided or somebody is impersonating this identity.");
    } else {
        this.contactChannel = message;
    }

}

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