Example usage for org.bouncycastle.crypto.params RC2Parameters RC2Parameters

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.params RC2Parameters RC2Parameters.

Prototype

public RC2Parameters(byte[] key, int bits) 

Source Link

Usage

From source file:org.cryptacular.pbe.PBES2EncryptionScheme.java

License:Open Source License

/**
 * Initializes the block cipher and sets up its initialization parameters.
 *
 * @param  generator  Derived key generator.
 * @param  scheme  PKCS#5 encryption scheme.
 *//* w  w w .  j  a  va2 s . com*/
private void initCipher(final PKCS5S2ParametersGenerator generator,
        final org.bouncycastle.asn1.pkcs.EncryptionScheme scheme) {
    final PBES2Algorithm alg = PBES2Algorithm.fromOid(scheme.getAlgorithm().getId());
    if (keyLength == 0) {
        keyLength = alg.getKeySize();
    }

    byte[] iv = null;
    CipherParameters cipherParameters = generator.generateDerivedParameters(keyLength);
    switch (alg) {

    case RC2:
        setCipher(alg.getCipherSpec().newInstance());

        final ASN1Sequence rc2Params = ASN1Sequence.getInstance(scheme.getParameters());
        if (rc2Params.size() > 1) {
            cipherParameters = new RC2Parameters(((KeyParameter) cipherParameters).getKey(),
                    ASN1Integer.getInstance(rc2Params.getObjectAt(0)).getValue().intValue());
            iv = ASN1OctetString.getInstance(rc2Params.getObjectAt(0)).getOctets();
        }
        break;

    case RC5:

        final ASN1Sequence rc5Params = ASN1Sequence.getInstance(scheme.getParameters());
        final int rounds = ASN1Integer.getInstance(rc5Params.getObjectAt(1)).getValue().intValue();
        final int blockSize = ASN1Integer.getInstance(rc5Params.getObjectAt(2)).getValue().intValue();
        if (blockSize == 32) {
            setCipher(new PaddedBufferedBlockCipher(new CBCBlockCipher(new RC532Engine()), new PKCS7Padding()));
        }
        cipherParameters = new RC5Parameters(((KeyParameter) cipherParameters).getKey(), rounds);
        if (rc5Params.size() > 3) {
            iv = ASN1OctetString.getInstance(rc5Params.getObjectAt(3)).getOctets();
        }
        break;

    default:
        setCipher(alg.getCipherSpec().newInstance());
        iv = ASN1OctetString.getInstance(scheme.getParameters()).getOctets();
    }
    if (iv != null) {
        cipherParameters = new ParametersWithIV(cipherParameters, iv);
    }
    setCipherParameters(cipherParameters);
}

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From source file:org.xwiki.crypto.cipher.internal.symmetric.factory.BcRc2CbcPaddedCipherFactory.java

License:Open Source License

@Override
protected org.bouncycastle.crypto.CipherParameters getBcKeyParameter(KeyParameter parameter) {
    if (parameter instanceof RC2KeyParameters) {
        return new RC2Parameters(parameter.getKey(), ((RC2KeyParameters) parameter).getEffectiveBits());
    } else {//from   w w w .  j  a v a  2 s.com
        return new org.bouncycastle.crypto.params.KeyParameter(parameter.getKey());
    }
}

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