Example usage for org.bouncycastle.crypto.digests KeccakDigest update

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.digests KeccakDigest update.

Prototype

public void update(byte[] in, int inOff, int len) 

Source Link

Usage

From source file:org.ethereum.crypto.Keccak256Helper.java

License:Open Source License

private static byte[] keccak256(byte[] message, int start, int length, KeccakDigest digest,
        boolean bouncyencoder) {
    byte[] hash = new byte[digest.getDigestSize()];

    if (message.length != 0) {
        digest.update(message, start, length);
    }//from  w w  w .j av  a2 s. c om
    digest.doFinal(hash, 0);
    return hash;
}

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From source file:org.ethereum.crypto.Keccak256Helper.java

License:Open Source License

private static byte[] doKeccak256(byte[] message, KeccakDigest digest, boolean bouncyencoder) {
    byte[] hash = new byte[digest.getDigestSize()];

    if (message.length != 0) {
        digest.update(message, 0, message.length);
    }/*  w  w w. j  a v  a2 s. co m*/
    digest.doFinal(hash, 0);
    return hash;
}

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From source file:org.ethereum.crypto.Keccak256Helper.java

License:Open Source License

private static byte[] doKeccak256(byte[] m1, byte[] m2, KeccakDigest digest, boolean bouncyencoder) {
    byte[] hash = new byte[digest.getDigestSize()];
    digest.update(m1, 0, m1.length);
    digest.update(m2, 0, m2.length);/*from w  w w  .  j  a v a2  s.  com*/

    digest.doFinal(hash, 0);
    return hash;
}

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From source file:org.ethereum.net.rlpx.EncryptionHandshake.java

License:Open Source License

void agreeSecret(byte[] initiatePacket, byte[] responsePacket) {
    BigInteger secretScalar = remoteEphemeralKey.multiply(ephemeralKey.getPrivKey()).normalize().getXCoord()
            .toBigInteger();//from w  ww .  j a  v  a2s . co m
    byte[] agreedSecret = ByteUtil.bigIntegerToBytes(secretScalar, SECRET_SIZE);
    byte[] sharedSecret = Keccak256Helper.keccak256(agreedSecret,
            Keccak256Helper.keccak256(responderNonce, initiatorNonce));
    byte[] aesSecret = Keccak256Helper.keccak256(agreedSecret, sharedSecret);
    secrets = new Secrets();
    secrets.aes = aesSecret;
    secrets.mac = Keccak256Helper.keccak256(agreedSecret, aesSecret);
    secrets.token = Keccak256Helper.keccak256(sharedSecret);

    KeccakDigest mac1 = new KeccakDigest(MAC_SIZE);
    mac1.update(xor(secrets.mac, responderNonce), 0, secrets.mac.length);
    byte[] buf = new byte[32];
    new KeccakDigest(mac1).doFinal(buf, 0);
    mac1.update(initiatePacket, 0, initiatePacket.length);
    new KeccakDigest(mac1).doFinal(buf, 0);
    KeccakDigest mac2 = new KeccakDigest(MAC_SIZE);
    mac2.update(xor(secrets.mac, initiatorNonce), 0, secrets.mac.length);
    new KeccakDigest(mac2).doFinal(buf, 0);
    mac2.update(responsePacket, 0, responsePacket.length);
    new KeccakDigest(mac2).doFinal(buf, 0);
    if (isInitiator) {
        secrets.egressMac = mac1;
        secrets.ingressMac = mac2;
    } else {
        secrets.egressMac = mac2;
        secrets.ingressMac = mac1;
    }
}

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From source file:org.ethereum.net.rlpx.FrameCodec.java

License:Open Source License

private byte[] updateMac(KeccakDigest mac, byte[] seed, int offset, byte[] out, int outOffset, boolean egress)
        throws IOException {
    byte[] aesBlock = new byte[mac.getDigestSize()];
    doSum(mac, aesBlock);//from   ww w .j a  va2s  .  c  o  m
    makeMacCipher().processBlock(aesBlock, 0, aesBlock, 0);
    // Note that although the mac digest size is 32 bytes, we only use 16 bytes in the computation
    int length = 16;
    for (int i = 0; i < length; i++) {
        aesBlock[i] ^= seed[i + offset];
    }
    mac.update(aesBlock, 0, length);
    byte[] result = new byte[mac.getDigestSize()];
    doSum(mac, result);
    if (egress) {
        System.arraycopy(result, 0, out, outOffset, length);
    } else {
        for (int i = 0; i < length; i++) {
            if (out[i + outOffset] != result[i]) {
                throw new IOException("MAC mismatch");
            }
        }
    }
    return result;
}

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