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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;

import java.io.ByteArrayInputStream;
import java.io.IOException;

import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.pkcs.EncryptedPrivateKeyInfo;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.operator.InputDecryptor;
import org.bouncycastle.operator.InputDecryptorProvider;
import org.bouncycastle.util.io.Streams;

/**
 * Holding class for a PKCS#8 EncryptedPrivateKeyInfo structure.
 */
public class PKCS8EncryptedPrivateKeyInfo
{
    private EncryptedPrivateKeyInfo encryptedPrivateKeyInfo;

    private static EncryptedPrivateKeyInfo parseBytes(byte[] pkcs8Encoding)
        throws IOException
    {
        try
        {
            return EncryptedPrivateKeyInfo.getInstance(ASN1Primitive.fromByteArray(pkcs8Encoding));
        }
        catch (ClassCastException e)
        {
            throw new PKCSIOException("malformed data: " + e.getMessage(), e);
        }
        catch (IllegalArgumentException e)
        {
            throw new PKCSIOException("malformed data: " + e.getMessage(), e);
        }
    }

    public PKCS8EncryptedPrivateKeyInfo(EncryptedPrivateKeyInfo encryptedPrivateKeyInfo)
    {
        this.encryptedPrivateKeyInfo = encryptedPrivateKeyInfo;
    }

    public PKCS8EncryptedPrivateKeyInfo(byte[] encryptedPrivateKeyInfo)
        throws IOException
    {
        this(parseBytes(encryptedPrivateKeyInfo));
    }

    public AlgorithmIdentifier getEncryptionAlgorithm()
    {
        return encryptedPrivateKeyInfo.getEncryptionAlgorithm();
    }

    public byte[] getEncryptedData()
    {
        return encryptedPrivateKeyInfo.getEncryptedData();
    }

    public EncryptedPrivateKeyInfo toASN1Structure()
    {
         return encryptedPrivateKeyInfo;
    }

    public byte[] getEncoded()
        throws IOException
    {
        return encryptedPrivateKeyInfo.getEncoded();
    }

    public PrivateKeyInfo decryptPrivateKeyInfo(InputDecryptorProvider inputDecryptorProvider)
        throws PKCSException
    {
        try
        {
            InputDecryptor decrytor = inputDecryptorProvider.get(encryptedPrivateKeyInfo.getEncryptionAlgorithm());

            ByteArrayInputStream encIn = new ByteArrayInputStream(encryptedPrivateKeyInfo.getEncryptedData());

            return PrivateKeyInfo.getInstance(Streams.readAll(decrytor.getInputStream(encIn)));
        }
        catch (Exception e)
        {
            throw new PKCSException("unable to read encrypted data: " + e.getMessage(), e);
        }
    }
}