Example usage for org.bouncycastle.crypto EphemeralKeyPair getKeyPair

Introduction

In this page you can find the example usage for org.bouncycastle.crypto EphemeralKeyPair getKeyPair.

Prototype

public AsymmetricCipherKeyPair getKeyPair() 

Source Link

Usage

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

License:Open Source License

public byte[] processBlock(byte[] in, int inOff, int inLen, byte[] macData) throws InvalidCipherTextException {
    if (forEncryption) {
        if (keyPairGenerator != null) {
            EphemeralKeyPair ephKeyPair = keyPairGenerator.generate();

            this.privParam = ephKeyPair.getKeyPair().getPrivate();
            this.v = ephKeyPair.getEncodedPublicKey();
        }/*ww w.  j  a  v  a2s  . c  o m*/
    } else {
        if (keyParser != null) {
            ByteArrayInputStream bIn = new ByteArrayInputStream(in, inOff, inLen);

            try {
                this.pubParam = keyParser.readKey(bIn);
            } catch (IOException e) {
                throw new InvalidCipherTextException(
                        "unable to recover ephemeral public key: " + e.getMessage(), e);
            }

            int encLength = (inLen - bIn.available());
            this.v = Arrays.copyOfRange(in, inOff, inOff + encLength);
        }
    }

    // Compute the common value and convert to byte array.
    agree.init(privParam);
    BigInteger z = agree.calculateAgreement(pubParam);
    byte[] Z = BigIntegers.asUnsignedByteArray(agree.getFieldSize(), z);

    // Create input to KDF.
    byte[] vz;
    //        if (v.length != 0)
    //        {
    //            VZ = new byte[v.length + Z.length];
    //            System.arraycopy(v, 0, VZ, 0, v.length);
    //            System.arraycopy(Z, 0, VZ, v.length, Z.length);
    //        }
    //        else
    {
        vz = Z;
    }

    // Initialise the KDF.
    DerivationParameters kdfParam;
    if (kdf instanceof MGF1BytesGeneratorExt) {
        kdfParam = new MGFParameters(vz);
    } else {
        kdfParam = new KDFParameters(vz, param.getDerivationV());
    }
    kdf.init(kdfParam);

    return forEncryption ? encryptBlock(in, inOff, inLen, macData) : decryptBlock(in, inOff, inLen, macData);
}

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