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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified.

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package org.bouncycastle.operator.jcajce;

import java.security.GeneralSecurityException;
import java.security.Key;
import java.security.Provider;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;

import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.kisa.KISAObjectIdentifiers;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.ntt.NTTObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.jcajce.util.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.util.NamedJcaJceHelper;
import org.bouncycastle.jcajce.util.ProviderJcaJceHelper;
import org.bouncycastle.operator.GenericKey;
import org.bouncycastle.operator.OperatorException;
import org.bouncycastle.operator.SymmetricKeyWrapper;

public class JceSymmetricKeyWrapper
    extends SymmetricKeyWrapper
{
    private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper());
    private SecureRandom random;
    private SecretKey wrappingKey;

    public JceSymmetricKeyWrapper(SecretKey wrappingKey)
    {
        super(determineKeyEncAlg(wrappingKey));

        this.wrappingKey = wrappingKey;
    }

    public JceSymmetricKeyWrapper setProvider(Provider provider)
    {
        this.helper = new OperatorHelper(new ProviderJcaJceHelper(provider));

        return this;
    }

    public JceSymmetricKeyWrapper setProvider(String providerName)
    {
        this.helper = new OperatorHelper(new NamedJcaJceHelper(providerName));

        return this;
    }

    public JceSymmetricKeyWrapper setSecureRandom(SecureRandom random)
    {
        this.random = random;

        return this;
    }

    public byte[] generateWrappedKey(GenericKey encryptionKey)
        throws OperatorException
    {
        Key contentEncryptionKeySpec = OperatorUtils.getJceKey(encryptionKey);

        Cipher keyEncryptionCipher = helper.createSymmetricWrapper(this.getAlgorithmIdentifier().getAlgorithm());

        try
        {
            keyEncryptionCipher.init(Cipher.WRAP_MODE, wrappingKey, random);

            return keyEncryptionCipher.wrap(contentEncryptionKeySpec);
        }
        catch (GeneralSecurityException e)
        {
            throw new OperatorException("cannot wrap key: " + e.getMessage(), e);
        }
    }

    private static AlgorithmIdentifier determineKeyEncAlg(SecretKey key)
    {
        return determineKeyEncAlg(key.getAlgorithm(), key.getEncoded().length * 8);
    }

    static AlgorithmIdentifier determineKeyEncAlg(String algorithm, int keySizeInBits)
    {
        if (algorithm.startsWith("DES") || algorithm.startsWith("TripleDES"))
        {
            return new AlgorithmIdentifier(PKCSObjectIdentifiers.id_alg_CMS3DESwrap, DERNull.INSTANCE);
        }
        else if (algorithm.startsWith("RC2"))
        {
            return new AlgorithmIdentifier(new ASN1ObjectIdentifier(
                    "1.2.840.113549.1.9.16.3.7"), new ASN1Integer(58));
        }
        else if (algorithm.startsWith("AES"))
        {
            ASN1ObjectIdentifier wrapOid;

            if (keySizeInBits == 128)
            {
                wrapOid = NISTObjectIdentifiers.id_aes128_wrap;
            }
            else if (keySizeInBits == 192)
            {
                wrapOid = NISTObjectIdentifiers.id_aes192_wrap;
            }
            else if (keySizeInBits == 256)
            {
                wrapOid = NISTObjectIdentifiers.id_aes256_wrap;
            }
            else
            {
                throw new IllegalArgumentException("illegal keysize in AES");
            }

            return new AlgorithmIdentifier(wrapOid); // parameters absent
        }
        else if (algorithm.startsWith("SEED"))
        {
            // parameters absent
            return new AlgorithmIdentifier(
                    KISAObjectIdentifiers.id_npki_app_cmsSeed_wrap);
        }
        else if (algorithm.startsWith("Camellia"))
        {
            ASN1ObjectIdentifier wrapOid;

            if (keySizeInBits == 128)
            {
                wrapOid = NTTObjectIdentifiers.id_camellia128_wrap;
            }
            else if (keySizeInBits == 192)
            {
                wrapOid = NTTObjectIdentifiers.id_camellia192_wrap;
            }
            else if (keySizeInBits == 256)
            {
                wrapOid = NTTObjectIdentifiers.id_camellia256_wrap;
            }
            else
            {
                throw new IllegalArgumentException(
                        "illegal keysize in Camellia");
            }

            return new AlgorithmIdentifier(wrapOid); // parameters must be
                                                     // absent
        }
        else
        {
            throw new IllegalArgumentException("unknown algorithm");
        }
    }
}