Example usage for javax.crypto KeyAgreement generateSecret

List of usage examples for javax.crypto KeyAgreement generateSecret

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Introduction

In this page you can find the example usage for javax.crypto KeyAgreement generateSecret.

Prototype

public final byte[] generateSecret() throws IllegalStateException

Source Link

Document

Generates the shared secret and returns it in a new buffer.

Usage

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

    DHParameterSpec dhParams = new DHParameterSpec(p512, g512);
    KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DH", "BC");

    keyGen.initialize(dhParams, new SecureRandom());

    KeyAgreement aKeyAgree = KeyAgreement.getInstance("DH", "BC");
    KeyPair aPair = keyGen.generateKeyPair();
    KeyAgreement bKeyAgree = KeyAgreement.getInstance("DH", "BC");
    KeyPair bPair = keyGen.generateKeyPair();

    aKeyAgree.init(aPair.getPrivate());/*from w  w w .j  a va2 s  .c om*/
    bKeyAgree.init(bPair.getPrivate());

    aKeyAgree.doPhase(bPair.getPublic(), true);
    bKeyAgree.doPhase(aPair.getPublic(), true);

    MessageDigest hash = MessageDigest.getInstance("SHA1", "BC");
    System.out.println(new String(hash.digest(aKeyAgree.generateSecret())));
    System.out.println(new String(hash.digest(bKeyAgree.generateSecret())));
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    //Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

    DHParameterSpec dhParams = new DHParameterSpec(p512, g512);
    KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DH", "BC");

    keyGen.initialize(dhParams, new SecureRandom());

    KeyAgreement aKeyAgree = KeyAgreement.getInstance("DH", "BC");
    KeyPair aPair = keyGen.generateKeyPair();
    KeyAgreement bKeyAgree = KeyAgreement.getInstance("DH", "BC");
    KeyPair bPair = keyGen.generateKeyPair();

    aKeyAgree.init(aPair.getPrivate());//from   w  ww.  j a v a  2s .  co  m
    bKeyAgree.init(bPair.getPrivate());

    aKeyAgree.doPhase(bPair.getPublic(), true);
    bKeyAgree.doPhase(aPair.getPublic(), true);

    MessageDigest hash = MessageDigest.getInstance("SHA1", "BC");
    System.out.println(new String(hash.digest(aKeyAgree.generateSecret())));
    System.out.println(new String(hash.digest(bKeyAgree.generateSecret())));
}

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    // Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

    KeyPairGenerator keyGen = KeyPairGenerator.getInstance("ECDH", "BC");
    EllipticCurve curve = new EllipticCurve(
            new ECFieldFp(new BigInteger("fffffffffffffffffffffffffffffffeffffffffffffffff", 16)),
            new BigInteger("fffffffffffffffffffffffffffffffefffffffffffffffc", 16),
            new BigInteger("fffffffffffffffffffffffffffffffefffffffffffffffc", 16));

    ECParameterSpec ecSpec = new ECParameterSpec(curve,
            new ECPoint(new BigInteger("fffffffffffffffffffffffffffffffefffffffffffffffc", 16),
                    new BigInteger("fffffffffffffffffffffffffffffffefffffffffffffffc", 16)),
            new BigInteger("fffffffffffffffffffffffffffffffefffffffffffffffc", 16), 1);

    keyGen.initialize(ecSpec, new SecureRandom());

    KeyAgreement aKeyAgree = KeyAgreement.getInstance("ECDH", "BC");
    KeyPair aPair = keyGen.generateKeyPair();
    KeyAgreement bKeyAgree = KeyAgreement.getInstance("ECDH", "BC");
    KeyPair bPair = keyGen.generateKeyPair();

    aKeyAgree.init(aPair.getPrivate());/*from  ww w  .j  a va  2s.  co  m*/
    bKeyAgree.init(bPair.getPrivate());

    aKeyAgree.doPhase(bPair.getPublic(), true);
    bKeyAgree.doPhase(aPair.getPublic(), true);

    MessageDigest hash = MessageDigest.getInstance("SHA1", "BC");

    System.out.println(new String(hash.digest(aKeyAgree.generateSecret())));
    System.out.println(new String(hash.digest(bKeyAgree.generateSecret())));
}

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

    KeyPairGenerator keyGen = KeyPairGenerator.getInstance("ECDH", "BC");
    EllipticCurve curve = new EllipticCurve(
            new ECFieldFp(new BigInteger("fffffffffffffffffffffffffffffffeffffffffffffffff", 16)),
            new BigInteger("fffffffffffffffffffffffffffffffefffffffffffffffc", 16),
            new BigInteger("fffffffffffffffffffffffffffffffefffffffffffffffc", 16));

    ECParameterSpec ecSpec = new ECParameterSpec(curve,
            new ECPoint(new BigInteger("fffffffffffffffffffffffffffffffefffffffffffffffc", 16),
                    new BigInteger("fffffffffffffffffffffffffffffffefffffffffffffffc", 16)),
            new BigInteger("fffffffffffffffffffffffffffffffefffffffffffffffc", 16), 1);

    keyGen.initialize(ecSpec, new SecureRandom());

    KeyAgreement aKeyAgree = KeyAgreement.getInstance("ECDH", "BC");
    KeyPair aPair = keyGen.generateKeyPair();
    KeyAgreement bKeyAgree = KeyAgreement.getInstance("ECDH", "BC");
    KeyPair bPair = keyGen.generateKeyPair();

    aKeyAgree.init(aPair.getPrivate());/*  w w  w  . j a  v a  2s  .  co m*/
    bKeyAgree.init(bPair.getPrivate());

    aKeyAgree.doPhase(bPair.getPublic(), true);
    bKeyAgree.doPhase(aPair.getPublic(), true);

    MessageDigest hash = MessageDigest.getInstance("SHA1", "BC");

    System.out.println(new String(hash.digest(aKeyAgree.generateSecret())));
    System.out.println(new String(hash.digest(bKeyAgree.generateSecret())));
}

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);//w w w .  j  a  v  a2  s .co 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");
}

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

/**
 * Determines the validation scheme for given input.
 * /*from ww w  . j  a  va 2s .  c o  m*/
 * @param otherPublicKeyBytes
 * @param agreement
 * @return shared secret bytes if client used a supported validation scheme
 */
protected static byte[] getSharedSecret(byte[] otherPublicKeyBytes, KeyAgreement agreement) {
    BigInteger otherPublicKeyInt = new BigInteger(1, otherPublicKeyBytes);
    try {
        KeyFactory keyFactory = KeyFactory.getInstance("DH");
        KeySpec otherPublicKeySpec = new DHPublicKeySpec(otherPublicKeyInt, RTMPHandshake.DH_MODULUS,
                RTMPHandshake.DH_BASE);
        PublicKey otherPublicKey = keyFactory.generatePublic(otherPublicKeySpec);
        agreement.doPhase(otherPublicKey, true);
    } catch (Exception e) {
        log.error("Exception getting the shared secret", e);
    }
    byte[] sharedSecret = agreement.generateSecret();
    //log.debug("Shared secret [{}]: {}", sharedSecret.length, Hex.encodeHexString(sharedSecret));
    return sharedSecret;
}