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

Introduction

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

Prototype

public ASN1ObjectIdentifier getAlgorithm() 

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.
 *///ww w . j  av a 2s.  co  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.jruby.ext.openssl.x509store.PEMInputOutput.java

License:LGPL

private static PrivateKey derivePrivateKeyPBES2(EncryptedPrivateKeyInfo eIn, AlgorithmIdentifier algId,
        char[] password) throws GeneralSecurityException, InvalidCipherTextException {
    PBES2Parameters pbeParams = PBES2Parameters.getInstance((ASN1Sequence) algId.getParameters());
    CipherParameters cipherParams = extractPBES2CipherParams(password, pbeParams);

    EncryptionScheme scheme = pbeParams.getEncryptionScheme();
    BufferedBlockCipher cipher;/*from  w w  w.  j  ava 2 s.  c o  m*/
    if (scheme.getAlgorithm().equals(PKCSObjectIdentifiers.RC2_CBC)) {
        RC2CBCParameter rc2Params = RC2CBCParameter.getInstance(scheme);
        byte[] iv = rc2Params.getIV();
        CipherParameters param = new ParametersWithIV(cipherParams, iv);
        cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new RC2Engine()));
        cipher.init(false, param);
    } else {
        byte[] iv = ((ASN1OctetString) scheme.getObject()).getOctets();
        // this version, done for BC 1.49 compat, caused #1238.
        //            byte[] iv = ASN1OctetString.getInstance(scheme).getOctets();
        CipherParameters param = new ParametersWithIV(cipherParams, iv);
        cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new DESedeEngine()));
        cipher.init(false, param);
    }

    byte[] data = eIn.getEncryptedData();
    byte[] out = new byte[cipher.getOutputSize(data.length)];
    int len = cipher.processBytes(data, 0, data.length, out, 0);
    len += cipher.doFinal(out, len);
    byte[] pkcs8 = new byte[len];
    System.arraycopy(out, 0, pkcs8, 0, len);
    KeyFactory fact = KeyFactory.getInstance("RSA"); // It seems to work for both RSA and DSA.
    return fact.generatePrivate(new PKCS8EncodedKeySpec(pkcs8));
}

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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   w w  w . ja va2  s .  c  om
        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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