Example usage for org.bouncycastle.asn1.pkcs EncryptionScheme getParameters

Introduction

In this page you can find the example usage for org.bouncycastle.asn1.pkcs EncryptionScheme getParameters.

Prototype

public ASN1Encodable getParameters() 

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.
 *///from w  w w.  j a  v a  2s  .c o m
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.password.internal.pbe.factory.AbstractBcPBES2CipherFactory.java

License:Open Source License

/**
 * @param forEncryption if true the cipher is initialised for encryption, if false for decryption.
 * @param password the password that will be used to derive the key.
 * @param kdfParams key derivation function parameters.
 * @param scheme encryption scheme.//from   ww w.j  ava2  s. c o m
 * @return a initialized key derivation function with a specific password bytes conversion mode.
 */
protected PasswordBasedCipher getInstance(boolean forEncryption, byte[] password, KeyDerivationFunc kdfParams,
        EncryptionScheme scheme) {
    KeyDerivationFunction kdf = getKeyDerivationFunction(kdfParams);

    // Fix key size if needed.
    if (kdf.getKeySize() < 0 || !isSupportedKeySize(kdf.getKeySize())) {
        kdf.overrideKeySize(getKeySize());
    }

    return getPasswordBasedCipher(forEncryption, kdf, new KeyWithIVParameters(kdf.derive(password).getKey(),
            ((ASN1OctetString) scheme.getParameters()).getOctets()));
}

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From source file:org.xwiki.crypto.password.internal.pbe.factory.AbstractBcPBES2Rc5CipherFactory.java

License:Open Source License

@Override
protected PasswordBasedCipher getInstance(boolean forEncryption, byte[] password, KeyDerivationFunc kdfParams,
        EncryptionScheme scheme) {
    KeyDerivationFunction kdf = getKeyDerivationFunction(kdfParams);
    RC5CBCParameter rc5Params = RC5CBCParameter.getInstance(scheme.getParameters());

    return getPasswordBasedCipher(forEncryption, kdf, getRC5CipherParameters(password, rc5Params, kdf));
}

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From source file:org.xwiki.crypto.password.internal.pbe.factory.BcPBES2AesCipherFactory.java

License:Open Source License

@Override
protected PasswordBasedCipher getInstance(boolean forEncryption, byte[] password, KeyDerivationFunc kdfParams,
        EncryptionScheme scheme) {
    KeyDerivationFunction kdf = getKeyDerivationFunction(kdfParams);

    // Set key size according to the encryption scheme algorithm used.
    kdf.overrideKeySize(getAESKeySize(scheme.getAlgorithm()));

    return getPasswordBasedCipher(forEncryption, kdf, new KeyWithIVParameters(kdf.derive(password).getKey(),
            ((ASN1OctetString) scheme.getParameters()).getOctets()));
}

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From source file:org.xwiki.crypto.password.internal.pbe.factory.BcPBES2CipherFactory.java

License:Open Source License

private PasswordBasedCipherFactory getPBES2CipherFactory(EncryptionScheme scheme) {
    try {//from   ww w . j  av  a  2  s  .  c o m
        if (scheme.getAlgorithm().equals(PKCSObjectIdentifiers.encryptionAlgorithm.branch("9"))) {
            RC5CBCParameter rc5Param = RC5CBCParameter.getInstance(scheme.getParameters());
            if (rc5Param.getBlockSizeInBits().intValue() > 64) {
                // RC5-CBC-Pad with a 128bits block size
                return manager.getInstance(PasswordBasedCipherFactory.class, "PBES2-RC5-64-CBC-Pad");
            }
        }
        return manager.getInstance(PasswordBasedCipherFactory.class, scheme.getAlgorithm().getId());
    } catch (ComponentLookupException e) {
        throw new UnsupportedOperationException("Password based cipher factory not found.", e);
    }
}

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From source file:org.xwiki.crypto.password.internal.pbe.factory.BcPBES2Rc2CipherFactory.java

License:Open Source License

@Override
protected PasswordBasedCipher getInstance(boolean forEncryption, byte[] password, KeyDerivationFunc kdfParams,
        EncryptionScheme scheme) {
    KeyDerivationFunction kdf = getKeyDerivationFunction(kdfParams);
    RC2CBCParameter rc2Params = RC2CBCParameter.getInstance(scheme.getParameters());

    return getPasswordBasedCipher(forEncryption, kdf, getRC2CipherParameters(password, rc2Params, kdf));
}

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