Example usage for org.bouncycastle.math.ec ECCurve.Fp decodePoint

Introduction

In this page you can find the example usage for org.bouncycastle.math.ec ECCurve.Fp decodePoint.

Prototype

public ECPoint decodePoint(byte[] encoded) 

Source Link

Document

Decode a point on this curve from its ASN.1 encoding.

Usage

From source file:ECIESTest.java

public TestResult perform() {
    SecureRandom random = new SecureRandom();
    ECCurve.Fp curve = new ECCurve.Fp(
            new BigInteger("883423532389192164791648750360308885314476597252960362792450860609699839"), // q
            new BigInteger("7fffffffffffffffffffffff7fffffffffff8000000000007ffffffffffc", 16), // a
            new BigInteger("6b016c3bdcf18941d0d654921475ca71a9db2fb27d1d37796185c2942c0a", 16)); // b

    ECDomainParameters params = new ECDomainParameters(curve,
            curve.decodePoint(Hex.decode("020ffa963cdca8816ccc33b8642bedf905c3d358573d3f27fbbd3b3cb9aaaf")), // G
            new BigInteger("883423532389192164791648750360308884807550341691627752275345424702807307")); // n

    ECKeyPairGenerator pGen = new ECKeyPairGenerator();
    ECKeyGenerationParameters genParam = new ECKeyGenerationParameters(params, random);

    pGen.init(genParam);//from   w w  w.jav  a  2  s . co  m

    AsymmetricCipherKeyPair p1 = pGen.generateKeyPair();
    AsymmetricCipherKeyPair p2 = pGen.generateKeyPair();

    //
    // stream test
    //
    IESEngine i1 = new IESEngine(new ECDHBasicAgreement(), new KDF2BytesGenerator(new SHA1Digest()),
            new HMac(new SHA1Digest()));
    IESEngine i2 = new IESEngine(new ECDHBasicAgreement(), new KDF2BytesGenerator(new SHA1Digest()),
            new HMac(new SHA1Digest()));
    byte[] d = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };
    byte[] e = new byte[] { 8, 7, 6, 5, 4, 3, 2, 1 };
    IESParameters p = new IESParameters(d, e, 64);

    i1.init(true, p1.getPrivate(), p2.getPublic(), p);
    i2.init(false, p2.getPrivate(), p1.getPublic(), p);

    byte[] message = Hex.decode("1234567890abcdef");

    try {
        byte[] out1 = i1.processBlock(message, 0, message.length);

        byte[] out2 = i2.processBlock(out1, 0, out1.length);

        if (!sameAs(out2, message)) {
            return new SimpleTestResult(false, this.getName() + ": stream cipher test failed");
        }

    } catch (Exception ex) {
        return new SimpleTestResult(false, this.getName() + ": stream cipher test exception " + ex.toString());
    }

    //
    // twofish with IV0 test
    //
    BufferedBlockCipher c1 = new PaddedBufferedBlockCipher(new CBCBlockCipher(new TwofishEngine()));
    BufferedBlockCipher c2 = new PaddedBufferedBlockCipher(new CBCBlockCipher(new TwofishEngine()));
    i1 = new IESEngine(new ECDHBasicAgreement(), new KDF2BytesGenerator(new SHA1Digest()),
            new HMac(new SHA1Digest()), c1);
    i2 = new IESEngine(new ECDHBasicAgreement(), new KDF2BytesGenerator(new SHA1Digest()),
            new HMac(new SHA1Digest()), c2);
    d = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };
    e = new byte[] { 8, 7, 6, 5, 4, 3, 2, 1 };
    p = new IESWithCipherParameters(d, e, 64, 128);

    i1.init(true, p1.getPrivate(), p2.getPublic(), p);
    i2.init(false, p2.getPrivate(), p1.getPublic(), p);

    message = Hex.decode("1234567890abcdef");

    try {
        byte[] out1 = i1.processBlock(message, 0, message.length);

        byte[] out2 = i2.processBlock(out1, 0, out1.length);

        if (!sameAs(out2, message)) {
            return new SimpleTestResult(false, this.getName() + ": twofish cipher test failed");
        }
    } catch (Exception ex) {
        return new SimpleTestResult(false, this.getName() + ": twofish cipher test exception " + ex.toString());
    }

    return new SimpleTestResult(true, this.getName() + ": Okay");
}

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