Example usage for javax.crypto.interfaces DHPublicKey getY

Introduction

In this page you can find the example usage for javax.crypto.interfaces DHPublicKey getY.

Prototype

BigInteger getY();

Source Link

Document

Returns the public value, y.

Usage

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    String s = "F488FD584E49DBCD20B49DE49107366B336C380D451D0F7C88"
            + "11111111111111111111111111111111111111111111111111"
            + "11111111111111111111111111111111111111111111111111"
            + "11111111111111111111111111111111111111111111111111"
            + "11111111111111111111111111111111111111111111111111" + "2F78C7";
    BigInteger base = BigInteger.valueOf(2);
    BigInteger modulus = new BigInteger(s, 16);
    DHParameterSpec skipParameterSpec = new DHParameterSpec(modulus, base);

    KeyPairGenerator kpg1 = KeyPairGenerator.getInstance("DH");
    kpg1.initialize(skipParameterSpec);/*from ww  w.  java 2  s . c o m*/
    KeyPair kp1 = kpg1.generateKeyPair();

    KeyAgreement ka1 = KeyAgreement.getInstance("DH");
    DHPrivateKey privateKey1 = (DHPrivateKey) kp1.getPrivate();
    DHPublicKey publicKey1 = (DHPublicKey) kp1.getPublic();
    ka1.init(privateKey1);
    System.out.println("1 is using " + publicKey1.getY() + " for its public key");
    KeyPairGenerator kpg2 = KeyPairGenerator.getInstance("DH");
    kpg2.initialize(skipParameterSpec);
    KeyPair kp2 = kpg2.generateKeyPair();

    KeyAgreement ka2 = KeyAgreement.getInstance("DH");
    DHPrivateKey privateKey2 = (DHPrivateKey) kp2.getPrivate();
    DHPublicKey publicKey2 = (DHPublicKey) kp2.getPublic();
    ka2.init(privateKey2);
    System.out.println("2 is using " + publicKey2.getY() + " for its public key");
    ka1.doPhase(publicKey2, true);
    byte[] sharedKey1 = ka1.generateSecret();
    System.out.println("1 is using " + new BigInteger(1, sharedKey1) + " for its shared key");

    ka2.doPhase(publicKey1, true);
    byte[] sharedKey2 = ka2.generateSecret();
    System.out.println("2 is using " + new BigInteger(1, sharedKey2) + " for its shared key");
}

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From source file:MainClass.java

public static void main(String[] args) throws Exception {
    String s = "F488FD584E49DBCD20B49DE49107366B336C380D451D0F7C88"
            + "11111111111111111111111111111111111111111111111111"
            + "11111111111111111111111111111111111111111111111111"
            + "11111111111111111111111111111111111111111111111111"
            + "11111111111111111111111111111111111111111111111111" + "2F78C7";
    BigInteger base = BigInteger.valueOf(2);
    BigInteger modulous = new BigInteger(s, 16);
    DHParameterSpec skipParameterSpec = new DHParameterSpec(modulous, base);

    KeyPairGenerator kpg1 = KeyPairGenerator.getInstance("DH");
    kpg1.initialize(skipParameterSpec);//from w w  w.java 2  s .  c  o m
    KeyPair kp1 = kpg1.generateKeyPair();

    KeyAgreement ka1 = KeyAgreement.getInstance("DH");
    DHPrivateKey privateKey1 = (DHPrivateKey) kp1.getPrivate();
    DHPublicKey publicKey1 = (DHPublicKey) kp1.getPublic();
    ka1.init(privateKey1);
    System.out.println("1 is using " + publicKey1.getY() + " for its public key");

    KeyPairGenerator kpg2 = KeyPairGenerator.getInstance("DH");
    kpg2.initialize(skipParameterSpec);
    KeyPair kp2 = kpg2.generateKeyPair();

    KeyAgreement ka2 = KeyAgreement.getInstance("DH");
    DHPrivateKey privateKey2 = (DHPrivateKey) kp2.getPrivate();
    DHPublicKey publicKey2 = (DHPublicKey) kp2.getPublic();
    ka2.init(privateKey2);
    System.out.println("2 is using " + publicKey2.getY() + "for its public key");
    // Use the KeyAgreement object of 1 to generate its shared key
    ka1.doPhase(publicKey2, true);
    SecretKey sharedKey1 = ka1.generateSecret("DES");
    System.out.println("1 is using " + new String(sharedKey1.getEncoded()) + " as its DES session key");
    // Use the KeyAgreement object of 2 to generate its shared key
    ka2.doPhase(publicKey1, true);
    SecretKey sharedKey2 = ka2.generateSecret("DES");
    System.out.println("2 is using " + new String(sharedKey2.getEncoded()) + "as its DES session key");
}

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From source file:edu.internet2.middleware.openid.message.encoding.EncodingUtils.java

/**
 * Encode a DH public key./*from  www  .  j a va2  s  .c  o  m*/
 * 
 * @param publicKey DH public key to encode
 * @return encoded public key
 */
public static String encodePublicKey(DHPublicKey publicKey) {
    return new String(Base64.encodeBase64(publicKey.getY().toByteArray()));
}

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From source file:org.cesecore.keys.util.KeyTools.java

/**
 * Print parameters of public part of a key.
 * //from w ww. j  a va  2 s  .c  o  m
 * @param publK
 *            the key
 * @param ps
 *            stream to print to.
 */
public static void printPublicKeyInfo(final PublicKey publK, final PrintStream ps) {
    if (publK instanceof RSAPublicKey) {
        ps.println("RSA key:");
        final RSAPublicKey rsa = (RSAPublicKey) publK;
        ps.println("  modulus: " + rsa.getModulus().toString(16));
        ps.println("  public exponent: " + rsa.getPublicExponent().toString(16));
        return;
    }
    if (publK instanceof ECPublicKey) {
        ps.println("Elliptic curve key:");
        final ECPublicKey ec = (ECPublicKey) publK;
        ps.println("  the affine x-coordinate: " + ec.getW().getAffineX().toString(16));
        ps.println("  the affine y-coordinate: " + ec.getW().getAffineY().toString(16));
        return;
    }
    if (publK instanceof DHPublicKey) {
        ps.println("DH key:");
        final DHPublicKey dh = (DHPublicKey) publK;
        ps.println("  the public value y: " + dh.getY().toString(16));
        return;
    }
    if (publK instanceof DSAPublicKey) {
        ps.println("DSA key:");
        final DSAPublicKey dsa = (DSAPublicKey) publK;
        ps.println("  the public value y: " + dsa.getY().toString(16));
        return;
    }
}

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From source file:org.red5.server.net.rtmp.RTMPHandshake.java

/**
 * Returns the public key for a given key pair.
 * // w w w . j ava2  s .c om
 * @param keyPair
 * @return public key
 */
protected static byte[] getPublicKey(KeyPair keyPair) {
    DHPublicKey incomingPublicKey = (DHPublicKey) keyPair.getPublic();
    BigInteger dhY = incomingPublicKey.getY();
    log.debug("Public key: {}", dhY);
    byte[] result = dhY.toByteArray();
    //log.debug("Public key as bytes - length [{}]: {}", result.length, Hex.encodeHexString(result));
    byte[] temp = new byte[KEY_LENGTH];
    if (result.length < KEY_LENGTH) {
        System.arraycopy(result, 0, temp, KEY_LENGTH - result.length, result.length);
        result = temp;
        log.debug("Padded public key length to 128");
    } else if (result.length > KEY_LENGTH) {
        System.arraycopy(result, result.length - KEY_LENGTH, temp, 0, KEY_LENGTH);
        result = temp;
        log.debug("Truncated public key length to 128");
    }
    return result;
}

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