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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 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.pkcs.bc;

import java.io.InputStream;

import org.bouncycastle.asn1.pkcs.PKCS12PBEParams;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.ExtendedDigest;
import org.bouncycastle.crypto.digests.SHA1Digest;
import org.bouncycastle.crypto.generators.PKCS12ParametersGenerator;
import org.bouncycastle.crypto.io.CipherInputStream;
import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher;
import org.bouncycastle.operator.GenericKey;
import org.bouncycastle.operator.InputDecryptor;
import org.bouncycastle.operator.InputDecryptorProvider;

public class BcPKCS12PBEInputDecryptorProviderBuilder
{
    private ExtendedDigest digest;

    public BcPKCS12PBEInputDecryptorProviderBuilder()
    {
         this(new SHA1Digest());
    }

    public BcPKCS12PBEInputDecryptorProviderBuilder(ExtendedDigest digest)
    {
         this.digest = digest;
    }

    public InputDecryptorProvider build(final char[] password)
    {
        return new InputDecryptorProvider()
        {
            public InputDecryptor get(final AlgorithmIdentifier algorithmIdentifier)
            {
                final PaddedBufferedBlockCipher engine = PKCS12PBEUtils.getEngine(algorithmIdentifier.getAlgorithm());

                PKCS12PBEParams           pbeParams = PKCS12PBEParams.getInstance(algorithmIdentifier.getParameters());

                CipherParameters params = PKCS12PBEUtils.createCipherParameters(algorithmIdentifier.getAlgorithm(), digest, engine.getBlockSize(), pbeParams, password);

                engine.init(false, params);

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

                    public InputStream getInputStream(InputStream input)
                    {
                        return new CipherInputStream(input, engine);
                    }

                    public GenericKey getKey()
                    {
                        return new GenericKey(algorithmIdentifier, PKCS12ParametersGenerator.PKCS12PasswordToBytes(password));
                    }
                };
            }
        };

    }
}