Java Code Examples for javax.crypto.interfaces.DHPrivateKey#getX()

static public AsymmetricKeyParameter generatePrivateKeyParameter(
    PrivateKey    key)
    throws InvalidKeyException
{
    if (key instanceof DHPrivateKey)
    {
        DHPrivateKey    k = (DHPrivateKey)key;

        return new DHPrivateKeyParameters(k.getX(),
            new DHParameters(k.getParams().getP(), k.getParams().getG(), null, k.getParams().getL()));
    }
                    
    throw new InvalidKeyException("can't identify DH private key.");
}
 

protected void engineInit(
    Key             key,
    SecureRandom    random) 
    throws InvalidKeyException
{
    if (!(key instanceof DHPrivateKey))
    {
        throw new InvalidKeyException("DHKeyAgreement requires DHPrivateKey");
    }

    DHPrivateKey    privKey = (DHPrivateKey)key;

    this.p = privKey.getParams().getP();
    this.g = privKey.getParams().getG();
    this.x = this.result = privKey.getX();
}
 

protected void engineInit(
    Key             key,
    SecureRandom    random) 
    throws InvalidKeyException
{
    if (!(key instanceof DHPrivateKey))
    {
        throw new InvalidKeyException("DHKeyAgreement requires DHPrivateKey");
    }

    DHPrivateKey    privKey = (DHPrivateKey)key;

    this.p = privKey.getParams().getP();
    this.g = privKey.getParams().getG();
    this.x = this.result = privKey.getX();
}
 

static public AsymmetricKeyParameter generatePrivateKeyParameter(
    PrivateKey    key)
    throws InvalidKeyException
{
    if (key instanceof DHPrivateKey)
    {
        DHPrivateKey    k = (DHPrivateKey)key;

        return new DHPrivateKeyParameters(k.getX(),
            new DHParameters(k.getParams().getP(), k.getParams().getG(), null, k.getParams().getL()));
    }

    throw new InvalidKeyException("can't identify DH private key.");
}
 

static public AsymmetricKeyParameter generatePrivateKeyParameter(
    PrivateKey    key)
    throws InvalidKeyException
{
    if (key instanceof DHPrivateKey)
    {
        DHPrivateKey    k = (DHPrivateKey)key;

        return new DHPrivateKeyParameters(k.getX(),
            new DHParameters(k.getParams().getP(), k.getParams().getG(), null, k.getParams().getL()));
    }
                    
    throw new InvalidKeyException("can't identify DH private key.");
}
 

protected void engineInit(
    Key                     key,
    AlgorithmParameterSpec  params,
    SecureRandom            random) 
    throws InvalidKeyException, InvalidAlgorithmParameterException
{
    if (!(key instanceof DHPrivateKey))
    {
        throw new InvalidKeyException("DHKeyAgreement requires DHPrivateKey for initialisation");
    }
    DHPrivateKey    privKey = (DHPrivateKey)key;

    if (params != null)
    {
        if (!(params instanceof DHParameterSpec))
        {
            throw new InvalidAlgorithmParameterException("DHKeyAgreement only accepts DHParameterSpec");
        }
        DHParameterSpec p = (DHParameterSpec)params;

        this.p = p.getP();
        this.g = p.getG();
    }
    else
    {
        this.p = privKey.getParams().getP();
        this.g = privKey.getParams().getG();
    }

    this.x = this.result = privKey.getX();
}
 

static public AsymmetricKeyParameter generatePrivateKeyParameter(
    PrivateKey    key)
    throws InvalidKeyException
{
    if (key instanceof DHPrivateKey)
    {
        DHPrivateKey    k = (DHPrivateKey)key;

        return new DHPrivateKeyParameters(k.getX(),
            new DHParameters(k.getParams().getP(), k.getParams().getG(), null, k.getParams().getL()));
    }
                    
    throw new InvalidKeyException("can't identify DH private key.");
}
 

static public AsymmetricKeyParameter generatePrivateKeyParameter(
    PrivateKey    key)
    throws InvalidKeyException
{
    if (key instanceof DHPrivateKey)
    {
        DHPrivateKey    k = (DHPrivateKey)key;

        return new DHPrivateKeyParameters(k.getX(),
            new DHParameters(k.getParams().getP(), k.getParams().getG(), null, k.getParams().getL()));
    }
                    
    throw new InvalidKeyException("can't identify DH private key.");
}
 

static public AsymmetricKeyParameter generatePrivateKeyParameter(
    PrivateKey    key)
    throws InvalidKeyException
{
    if (key instanceof DHPrivateKey)
    {
        DHPrivateKey    k = (DHPrivateKey)key;

        return new DHPrivateKeyParameters(k.getX(),
            new DHParameters(k.getParams().getP(), k.getParams().getG(), null, k.getParams().getL()));
    }
                    
    throw new InvalidKeyException("can't identify DH private key.");
}
 

protected byte[] getDigestedZZ(String otherPublicKeyBase64)
{
    DHPublicKey  dhPublicKey  = stringToPublicKey(otherPublicKeyBase64);
    DHPrivateKey dhPrivateKey = getPrivateKey();
    BigInteger xa = dhPrivateKey.getX();
    BigInteger yb = dhPublicKey.getY();
    BigInteger p  = _dhParameterSpec.getP();

    BigInteger zz = yb.modPow(xa, p);

    return _hDigest.digest(zz.toByteArray());
}
 

BCElGamalPrivateKey(
    DHPrivateKey key)
{
    this.x = key.getX();
    this.elSpec = new ElGamalParameterSpec(key.getParams().getP(), key.getParams().getG());
}
 

BCDHPrivateKey(
    DHPrivateKey key)
{
    this.x = key.getX();
    this.dhSpec = key.getParams();
}
 

JCEDHPrivateKey(
    DHPrivateKey    key)
{
    this.x = key.getX();
    this.dhSpec = key.getParams();
}
 

BCElGamalPrivateKey(
    DHPrivateKey key)
{
    this.x = key.getX();
    this.elSpec = new ElGamalParameterSpec(key.getParams().getP(), key.getParams().getG());
}
 

JCEElGamalPrivateKey(
    DHPrivateKey    key)
{
    this.x = key.getX();
    this.elSpec = new ElGamalParameterSpec(key.getParams().getP(), key.getParams().getG());
}
 

JCEDHPrivateKey(
    DHPrivateKey    key)
{
    this.x = key.getX();
    this.dhSpec = key.getParams();
}
 

JCEElGamalPrivateKey(
    DHPrivateKey    key)
{
    this.x = key.getX();
    this.elSpec = new ElGamalParameterSpec(key.getParams().getP(), key.getParams().getG());
}
 

private void testKeyPair(KeyPair keyPair, int expectedKeySize) throws Exception {
  DHPrivateKey priv = (DHPrivateKey) keyPair.getPrivate();
  BigInteger p = priv.getParams().getP();
  BigInteger g = priv.getParams().getG();
  int keySize = p.bitLength();
  assertEquals("wrong key size", expectedKeySize, keySize);

  // Checks the key size of the private key.
  // NIST SP 800-56A requires that x is in the range (1, q-1).
  // Such a choice would require a full key validation. Since such a validation
  // requires the value q (which is not present in the DH parameters) larger keys
  // should be chosen to prevent attacks.
  int minPrivateKeyBits = keySize / 2;
  BigInteger x = priv.getX();
  assertTrue(x.bitLength() >= minPrivateKeyBits - 32);
  // TODO(bleichen): add tests for weak random number generators.

  // Verify the DH parameters.
  System.out.println("p=" + p.toString(16));
  System.out.println("g=" + g.toString(16));
  System.out.println("testKeyPairGenerator L=" + priv.getParams().getL());
  // Basic parameter checks
  assertTrue("Expecting g > 1", g.compareTo(BigInteger.ONE) > 0);
  assertTrue("Expecting g < p - 1", g.compareTo(p.subtract(BigInteger.ONE)) < 0);
  // Expecting p to be prime.
  // No high certainty is needed, since this is a unit test.
  assertTrue(p.isProbablePrime(4));
  // The order of g should be a large prime divisor q of p-1.
  // (see e.g. NIST SP 800-56A, section 5.5.1.1.)
  // If the order of g is composite then the Decision Diffie Hellman assumption is
  // not satisfied for the group generated by g. Moreover, attacks using Pohlig-Hellman
  // might be feasible.
  // A good way to achieve these requirements is to select a safe prime p (i.e. a prime
  // where q=(p-1)/2 is prime too. NIST SP 800-56A does not require (or even recommend)
  // safe primes and allows Diffie-Hellman parameters where q is significantly smaller.
  // Unfortunately, the key does not contain q and thus the conditions above  cannot be
  // tested easily.
  // We perform a partial test that performs a partial factorization of p-1 and then
  // test whether one of the small factors found by the partial factorization divides
  // the order of g.
  boolean isSafePrime = p.shiftRight(1).isProbablePrime(4);
  System.out.println("p is a safe prime:" + isSafePrime);
  BigInteger r; // p-1 divided by small prime factors.
  if (isSafePrime) {
    r = p.shiftRight(1);
  } else {
    BigInteger p1 = p.subtract(BigInteger.ONE);
    r = p1.divide(smoothDivisor(p1));
  }
  System.out.println("r=" + r.toString(16));
  assertEquals(
      "g likely does not generate a prime oder subgroup", BigInteger.ONE, g.modPow(r, p));

  // Checks that there are not too many short prime factors.
  // I.e., subgroup confinment attacks can find at least keySize - r.bitLength() bits of the key.
  // At least 160 unknown bits should remain.
  // Only very weak parameters are detected here, since the factorization above only finds small
  // prime factors.
  assertTrue(minPrivateKeyBits - (keySize - r.bitLength()) > 160);

  // DH parameters are sometime misconfigures and g and q are swapped.
  // A large g that divides p-1 is suspicious.
  if (g.bitLength() >= 160) {
    assertTrue(p.mod(g).compareTo(BigInteger.ONE) > 0);
  }
}
 

BCDHPrivateKey(
    DHPrivateKey key)
{
    this.x = key.getX();
    this.dhSpec = key.getParams();
}
 

private static void checkKeyPair(KeyPair kp, int pSize,
            Provider provider) throws Exception {

    DHPrivateKey privateKey = (DHPrivateKey)kp.getPrivate();
    BigInteger p = privateKey.getParams().getP();
    if (p.bitLength() != pSize) {
        throw new Exception(
            "Invalid modulus size: " + p.bitLength() + "/" + pSize);
    }

    // System.out.println("P(" + pSize + "): " + p.toString());
    if (!p.isProbablePrime(128)) {
        throw new Exception("Good luck, the modulus is composite!");
    }

    DHPublicKey publicKey = (DHPublicKey)kp.getPublic();
    p = publicKey.getParams().getP();
    if (p.bitLength() != pSize) {
        throw new Exception(
            "Invalid modulus size: " + p.bitLength() + "/" + pSize);
    }

    BigInteger leftOpen = BigInteger.ONE;
    BigInteger rightOpen = p.subtract(BigInteger.ONE);

    // ignore the private key range checking on Solaris at present
    if (!provider.getName().equals("SunPKCS11-Solaris")) {
        BigInteger x = privateKey.getX();
        if ((x.compareTo(leftOpen) <= 0) ||
                (x.compareTo(rightOpen) >= 0)) {
            throw new Exception(
                "X outside range [2, p - 2]:  x: " + x + " p: " + p);
        }
    }

    BigInteger y = publicKey.getY();
    if ((y.compareTo(leftOpen) <= 0) ||
            (y.compareTo(rightOpen) >= 0)) {
        throw new Exception(
            "Y outside range [2, p - 2]:  y: " + y + " p: " + p);
    }
}