Example usage for org.bouncycastle.crypto.modes SICBlockCipher processBlock

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.modes SICBlockCipher processBlock.

Prototype

public int processBlock(byte[] in, int inOff, byte[] out, int outOff)
            throws DataLengthException, IllegalStateException 

Source Link

Usage

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

License:Open Source License

@Test // basic encryption/decryption
public void test11() throws Throwable {

    byte[] keyBytes = HashUtil.keccak256("...".getBytes());
    log.info("key: {}", Hex.toHexString(keyBytes));
    byte[] ivBytes = new byte[16];
    byte[] payload = Hex.decode("22400891000000000000000000000000");

    KeyParameter key = new KeyParameter(keyBytes);
    ParametersWithIV params = new ParametersWithIV(key, new byte[16]);

    AESEngine engine = new AESEngine();
    SICBlockCipher ctrEngine = new SICBlockCipher(engine);

    ctrEngine.init(true, params);//from   w  ww .j ava  2  s.  c om

    byte[] cipher = new byte[16];
    ctrEngine.processBlock(payload, 0, cipher, 0);

    log.info("cipher: {}", Hex.toHexString(cipher));

    byte[] output = new byte[cipher.length];
    ctrEngine.init(false, params);
    ctrEngine.processBlock(cipher, 0, output, 0);

    assertEquals(Hex.toHexString(output), Hex.toHexString(payload));
    log.info("original: {}", Hex.toHexString(payload));
}

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

License:Open Source License

@Test // big packet encryption
public void test12() throws Throwable {

    AESEngine engine = new AESEngine();
    SICBlockCipher ctrEngine = new SICBlockCipher(engine);

    byte[] keyBytes = Hex.decode("a4627abc2a3c25315bff732cb22bc128f203912dd2a840f31e66efb27a47d2b1");
    byte[] ivBytes = new byte[16];
    byte[] payload = Hex.decode(
            "0109efc76519b683d543db9d0991bcde99cc9a3d14b1d0ecb8e9f1f66f31558593d746eaa112891b04ef7126e1dce17c9ac92ebf39e010f0028b8ec699f56f5d0c0d00");
    byte[] cipherText = Hex.decode(
            "f9fab4e9dd9fc3e5d0d0d16da254a2ac24df81c076e3214e2c57da80a46e6ae4752f4b547889fa692b0997d74f36bb7c047100ba71045cb72cfafcc7f9a251762cdf8f");

    KeyParameter key = new KeyParameter(keyBytes);
    ParametersWithIV params = new ParametersWithIV(key, ivBytes);

    ctrEngine.init(true, params);//w ww.j  a v a2s  .c  o m

    byte[] in = payload;
    byte[] out = new byte[in.length];

    int i = 0;

    while (i < in.length) {
        ctrEngine.processBlock(in, i, out, i);
        i += engine.getBlockSize();
        if (in.length - i < engine.getBlockSize())
            break;
    }

    // process left bytes
    if (in.length - i > 0) {
        byte[] tmpBlock = new byte[16];
        System.arraycopy(in, i, tmpBlock, 0, in.length - i);
        ctrEngine.processBlock(tmpBlock, 0, tmpBlock, 0);
        System.arraycopy(tmpBlock, 0, out, i, in.length - i);
    }

    log.info("cipher: {}", Hex.toHexString(out));

    assertEquals(Hex.toHexString(cipherText), Hex.toHexString(out));
}

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

License:Open Source License

/**
 * Decrypt cipher by AES in SIC(also know as CTR) mode
 *
 * @param cipher -proper cipher//  w  ww  .  j  ava2 s. co m
 * @return decrypted cipher, equal length to the cipher.
 */
public byte[] decryptAES(byte[] cipher) {

    if (priv == null) {
        throw new MissingPrivateKeyException();
    }

    AESEngine engine = new AESEngine();
    SICBlockCipher ctrEngine = new SICBlockCipher(engine);

    KeyParameter key = new KeyParameter(BigIntegers.asUnsignedByteArray(priv));
    ParametersWithIV params = new ParametersWithIV(key, new byte[16]);

    ctrEngine.init(false, params);

    int i = 0;
    byte[] out = new byte[cipher.length];
    while (i < cipher.length) {
        ctrEngine.processBlock(cipher, i, out, i);
        i += engine.getBlockSize();
        if (cipher.length - i < engine.getBlockSize()) {
            break;
        }
    }

    // process left bytes
    if (cipher.length - i > 0) {
        byte[] tmpBlock = new byte[16];
        System.arraycopy(cipher, i, tmpBlock, 0, cipher.length - i);
        ctrEngine.processBlock(tmpBlock, 0, tmpBlock, 0);
        System.arraycopy(tmpBlock, 0, out, i, cipher.length - i);
    }

    return out;
}

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