Example usage for org.bouncycastle.crypto.engines EthereumIESEngine processBlock

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.engines EthereumIESEngine processBlock.

Prototype

public byte[] processBlock(byte[] in, int inOff, int inLen) throws InvalidCipherTextException 

Source Link

Usage

From source file:org.ethereum.crypto.ECIESCoder.java

License:Open Source License

/**
 *  Encryption equivalent to the Crypto++ default ECIES<ECP> settings:
 *
 *  DL_KeyAgreementAlgorithm:        DL_KeyAgreementAlgorithm_DH<struct ECPPoint,struct EnumToType<enum CofactorMultiplicationOption,0> >
 *  DL_KeyDerivationAlgorithm:       DL_KeyDerivationAlgorithm_P1363<struct ECPPoint,0,class P1363_KDF2<class SHA1> >
 *  DL_SymmetricEncryptionAlgorithm: DL_EncryptionAlgorithm_Xor<class HMAC<class SHA1>,0>
 *  DL_PrivateKey:                   DL_Key<ECPPoint>
 *  DL_PrivateKey_EC<class ECP>//from  ww w . j av a 2s.  c o  m
 *
 *  Used for Whisper V3
 */
public static byte[] decryptSimple(BigInteger privKey, byte[] cipher)
        throws IOException, InvalidCipherTextException {
    EthereumIESEngine iesEngine = new EthereumIESEngine(new ECDHBasicAgreement(),
            new MGF1BytesGeneratorExt(new SHA1Digest(), 1), new HMac(new SHA1Digest()), new SHA1Digest(), null);

    IESParameters p = new IESParameters(null, null, KEY_SIZE);
    ParametersWithIV parametersWithIV = new ParametersWithIV(p, new byte[0]);

    iesEngine.setHashMacKey(false);

    iesEngine.init(new ECPrivateKeyParameters(privKey, CURVE), parametersWithIV,
            new ECIESPublicKeyParser(ECKey.CURVE));

    return iesEngine.processBlock(cipher, 0, cipher.length);
}

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From source file:org.ethereum.crypto.ECIESTest.java

License:Open Source License

public static byte[] decrypt(BigInteger prv, byte[] cipher) throws InvalidCipherTextException, IOException {
    ByteArrayInputStream is = new ByteArrayInputStream(cipher);
    byte[] ephemBytes = new byte[2 * ((curve.getCurve().getFieldSize() + 7) / 8) + 1];
    is.read(ephemBytes);//from  w w  w .j av a 2s. c  o  m
    ECPoint ephem = curve.getCurve().decodePoint(ephemBytes);
    byte[] IV = new byte[KEY_SIZE / 8];
    is.read(IV);
    byte[] cipherBody = new byte[is.available()];
    is.read(cipherBody);

    EthereumIESEngine iesEngine = makeIESEngine(false, ephem, prv, IV);

    byte[] message = iesEngine.processBlock(cipherBody, 0, cipherBody.length);
    return message;
}

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From source file:org.ethereum.crypto.ECIESTest.java

License:Open Source License

public static byte[] encrypt(ECPoint toPub, byte[] plaintext) throws InvalidCipherTextException, IOException {

    ECKeyPairGenerator eGen = new ECKeyPairGenerator();
    SecureRandom random = new SecureRandom();
    KeyGenerationParameters gParam = new ECKeyGenerationParameters(curve, random);

    eGen.init(gParam);// w w  w.  j  a v  a2s  .  c  om

    byte[] IV = new byte[KEY_SIZE / 8];
    new SecureRandom().nextBytes(IV);

    AsymmetricCipherKeyPair ephemPair = eGen.generateKeyPair();
    BigInteger prv = ((ECPrivateKeyParameters) ephemPair.getPrivate()).getD();
    ECPoint pub = ((ECPublicKeyParameters) ephemPair.getPublic()).getQ();
    EthereumIESEngine iesEngine = makeIESEngine(true, toPub, prv, IV);

    ECKeyGenerationParameters keygenParams = new ECKeyGenerationParameters(curve, random);
    ECKeyPairGenerator generator = new ECKeyPairGenerator();
    generator.init(keygenParams);

    ECKeyPairGenerator gen = new ECKeyPairGenerator();
    gen.init(new ECKeyGenerationParameters(ECKey.CURVE, random));

    byte[] cipher = iesEngine.processBlock(plaintext, 0, plaintext.length);
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    bos.write(pub.getEncoded(false));
    bos.write(IV);
    bos.write(cipher);
    return bos.toByteArray();
}

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