Example usage for org.bouncycastle.asn1.pkcs PBES2Parameters getEncryptionScheme

Introduction

In this page you can find the example usage for org.bouncycastle.asn1.pkcs PBES2Parameters getEncryptionScheme.

Prototype

public EncryptionScheme getEncryptionScheme() 

Source Link

Usage

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

License:Open Source License

/**
 * Creates a new instance with the given parameters.
 *
 * @param  params  PBES2 parameters describing the key derivation function and
 *                 encryption scheme.//from  w  w  w .  j a  v a2  s . c o  m
 * @param  password  Password used to derive key.
 */
public PBES2EncryptionScheme(final PBES2Parameters params, final char[] password) {
    final PBKDF2Params kdfParams = PBKDF2Params.getInstance(params.getKeyDerivationFunc().getParameters());
    final byte[] salt = kdfParams.getSalt();
    final int iterations = kdfParams.getIterationCount().intValue();
    if (kdfParams.getKeyLength() != null) {
        keyLength = kdfParams.getKeyLength().intValue() * 8;
    }

    final PKCS5S2ParametersGenerator generator = new PKCS5S2ParametersGenerator();
    generator.init(PBEParametersGenerator.PKCS5PasswordToUTF8Bytes(password), salt, iterations);
    initCipher(generator, params.getEncryptionScheme());
}

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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;/* w  w w  .  j  av  a 2 s  .c  om*/
    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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