org.bouncycastle.openssl.jcajce.JceOpenSSLPKCS8DecryptorProviderBuilder Maven / Gradle / Ivy

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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.
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package org.bouncycastle.openssl.jcajce;

import java.io.IOException;
import java.io.InputStream;
import java.security.AlgorithmParameters;
import java.security.GeneralSecurityException;
import java.security.Provider;

import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;

import org.bouncycastle.asn1.pkcs.EncryptionScheme;
import org.bouncycastle.asn1.pkcs.KeyDerivationFunc;
import org.bouncycastle.asn1.pkcs.PBEParameter;
import org.bouncycastle.asn1.pkcs.PBES2Parameters;
import org.bouncycastle.asn1.pkcs.PBKDF2Params;
import org.bouncycastle.asn1.pkcs.PKCS12PBEParams;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.jcajce.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.JcaJceHelper;
import org.bouncycastle.jcajce.NamedJcaJceHelper;
import org.bouncycastle.jcajce.ProviderJcaJceHelper;
import org.bouncycastle.openssl.PEMException;
import org.bouncycastle.operator.InputDecryptor;
import org.bouncycastle.operator.InputDecryptorProvider;
import org.bouncycastle.operator.OperatorCreationException;

public class JceOpenSSLPKCS8DecryptorProviderBuilder
{
    private JcaJceHelper helper = new DefaultJcaJceHelper();

    public JceOpenSSLPKCS8DecryptorProviderBuilder()
    {
        helper = new DefaultJcaJceHelper();
    }

    public JceOpenSSLPKCS8DecryptorProviderBuilder setProvider(String providerName)
    {
        helper = new NamedJcaJceHelper(providerName);

        return this;
    }

    public JceOpenSSLPKCS8DecryptorProviderBuilder setProvider(Provider provider)
    {
        helper = new ProviderJcaJceHelper(provider);

        return this;
    }

    public InputDecryptorProvider build(final char[] password)
        throws OperatorCreationException
    {
        return new InputDecryptorProvider()
        {
            public InputDecryptor get(final AlgorithmIdentifier algorithm)
                throws OperatorCreationException
            {
                final Cipher cipher;

                try
                {
                    if (PEMUtilities.isPKCS5Scheme2(algorithm.getAlgorithm()))
                    {
                        PBES2Parameters params = PBES2Parameters.getInstance(algorithm.getParameters());
                        KeyDerivationFunc func = params.getKeyDerivationFunc();
                        EncryptionScheme scheme = params.getEncryptionScheme();
                        PBKDF2Params defParams = (PBKDF2Params)func.getParameters();

                        int iterationCount = defParams.getIterationCount().intValue();
                        byte[] salt = defParams.getSalt();

                        String oid = scheme.getAlgorithm().getId();

                        SecretKey key = PEMUtilities.generateSecretKeyForPKCS5Scheme2(oid, password, salt, iterationCount);

                        cipher = helper.createCipher(oid);
                        AlgorithmParameters algParams = helper.createAlgorithmParameters(oid);

                        algParams.init(scheme.getParameters().toASN1Primitive().getEncoded());

                        cipher.init(Cipher.DECRYPT_MODE, key, algParams);
                    }
                    else if (PEMUtilities.isPKCS12(algorithm.getAlgorithm()))
                    {
                        PKCS12PBEParams params = PKCS12PBEParams.getInstance(algorithm.getParameters());
                        PBEKeySpec pbeSpec = new PBEKeySpec(password);

                        SecretKeyFactory secKeyFact = helper.createSecretKeyFactory(algorithm.getAlgorithm().getId());
                        PBEParameterSpec defParams = new PBEParameterSpec(params.getIV(), params.getIterations().intValue());

                        cipher = helper.createCipher(algorithm.getAlgorithm().getId());

                        cipher.init(Cipher.DECRYPT_MODE, secKeyFact.generateSecret(pbeSpec), defParams);
                    }
                    else if (PEMUtilities.isPKCS5Scheme1(algorithm.getAlgorithm()))
                    {
                        PBEParameter params = PBEParameter.getInstance(algorithm.getParameters());
                        PBEKeySpec pbeSpec = new PBEKeySpec(password);

                        SecretKeyFactory secKeyFact = helper.createSecretKeyFactory(algorithm.getAlgorithm().getId());
                        PBEParameterSpec defParams = new PBEParameterSpec(params.getSalt(), params.getIterationCount().intValue());

                        cipher = helper.createCipher(algorithm.getAlgorithm().getId());

                        cipher.init(Cipher.DECRYPT_MODE, secKeyFact.generateSecret(pbeSpec), defParams);
                    }
                    else
                    {
                        throw new PEMException("Unknown algorithm: " + algorithm.getAlgorithm());
                    }

                    return new InputDecryptor()
                    {
                        public AlgorithmIdentifier getAlgorithmIdentifier()
                        {
                            return algorithm;
                        }

                        public InputStream getInputStream(InputStream encIn)
                        {
                            return new CipherInputStream(encIn, cipher);
                        }
                    };
                }
                catch (IOException e)
                {
                    throw new OperatorCreationException(algorithm.getAlgorithm() + " not available: " + e.getMessage(), e);
                }
                catch (GeneralSecurityException e)
                {
                    throw new OperatorCreationException(algorithm.getAlgorithm() + " not available: " + e.getMessage(), e);
                }
            };
        };
    }
}