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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 and up. 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.cert.crmf;

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

import org.bouncycastle.asn1.crmf.EncryptedValue;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.Certificate;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.operator.InputDecryptor;
import org.bouncycastle.util.Strings;
import org.bouncycastle.util.io.Streams;

/**
 * Parser for EncryptedValue structures.
 */
public class EncryptedValueParser
{
    private EncryptedValue value;
    private EncryptedValuePadder padder;

    /**
     * Basic constructor - create a parser to read the passed in value.
     *
     * @param value the value to be parsed.
     */
    public EncryptedValueParser(EncryptedValue value)
    {
        this.value = value;
    }

    /**
     * Create a parser to read the passed in value, assuming the padder was
     * applied to the data prior to encryption.
     *
     * @param value  the value to be parsed.
     * @param padder the padder to be used to remove padding from the decrypted value..
     */
    public EncryptedValueParser(EncryptedValue value, EncryptedValuePadder padder)
    {
        this.value = value;
        this.padder = padder;
    }

    public AlgorithmIdentifier getIntendedAlg()
    {
        return value.getIntendedAlg();
    }

    private byte[] decryptValue(ValueDecryptorGenerator decGen)
        throws CRMFException
    {
        if (value.getValueHint() != null)
        {
            throw new UnsupportedOperationException();
        }

        InputDecryptor decryptor = decGen.getValueDecryptor(value.getKeyAlg(),
            value.getSymmAlg(), value.getEncSymmKey().getBytes());
        InputStream dataIn = decryptor.getInputStream(new ByteArrayInputStream(
            value.getEncValue().getBytes()));
        try
        {
            byte[] data = Streams.readAll(dataIn);

            if (padder != null)
            {
                return padder.getUnpaddedData(data);
            }
            
            return data;
        }
        catch (IOException e)
        {
            throw new CRMFException("Cannot parse decrypted data: " + e.getMessage(), e);
        }
    }

    /**
     * Read a X.509 certificate.
     *
     * @param decGen the decryptor generator to decrypt the encrypted value.
     * @return an X509CertificateHolder containing the certificate read.
     * @throws CRMFException if the decrypted data cannot be parsed, or a decryptor cannot be generated.
     */
    public X509CertificateHolder readCertificateHolder(ValueDecryptorGenerator decGen)
        throws CRMFException
    {
        return new X509CertificateHolder(Certificate.getInstance(decryptValue(decGen)));
    }

    /**
     * Read a PKCS#8 PrivateKeyInfo.
     *
     * @param decGen the decryptor generator to decrypt the encrypted value.
     * @return an PrivateKeyInfo containing the private key that was read.
     * @throws CRMFException if the decrypted data cannot be parsed, or a decryptor cannot be generated.
     */
    public PrivateKeyInfo readPrivateKeyInfo(ValueDecryptorGenerator decGen)
        throws CRMFException
    {
        return PrivateKeyInfo.getInstance(decryptValue(decGen));
    }

    /**
     * Read a pass phrase.
     *
     * @param decGen the decryptor generator to decrypt the encrypted value.
     * @return a pass phrase as recovered from the encrypted value.
     * @throws CRMFException if the decrypted data cannot be parsed, or a decryptor cannot be generated.
     */
    public char[] readPassphrase(ValueDecryptorGenerator decGen)
        throws CRMFException
    {
        return Strings.fromUTF8ByteArray(decryptValue(decGen)).toCharArray();
    }
}