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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

The newest version!

package org.spongycastle.cms;

import java.util.ArrayList;
import java.util.List;

import org.spongycastle.asn1.cms.OriginatorInfo;
import org.spongycastle.asn1.kisa.KISAObjectIdentifiers;
import org.spongycastle.asn1.nist.NISTObjectIdentifiers;
import org.spongycastle.asn1.ntt.NTTObjectIdentifiers;
import org.spongycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.spongycastle.asn1.x9.X9ObjectIdentifiers;

/**
 * General class for generating a CMS enveloped-data message.
 */
public class CMSEnvelopedGenerator
{
    public static final String  DES_EDE3_CBC    = PKCSObjectIdentifiers.des_EDE3_CBC.getId();
    public static final String  RC2_CBC         = PKCSObjectIdentifiers.RC2_CBC.getId();
    public static final String  IDEA_CBC        = "1.3.6.1.4.1.188.7.1.1.2";
    public static final String  CAST5_CBC       = "1.2.840.113533.7.66.10";
    public static final String  AES128_CBC      = NISTObjectIdentifiers.id_aes128_CBC.getId();
    public static final String  AES192_CBC      = NISTObjectIdentifiers.id_aes192_CBC.getId();
    public static final String  AES256_CBC      = NISTObjectIdentifiers.id_aes256_CBC.getId();
    public static final String  CAMELLIA128_CBC = NTTObjectIdentifiers.id_camellia128_cbc.getId();
    public static final String  CAMELLIA192_CBC = NTTObjectIdentifiers.id_camellia192_cbc.getId();
    public static final String  CAMELLIA256_CBC = NTTObjectIdentifiers.id_camellia256_cbc.getId();
    public static final String  SEED_CBC        = KISAObjectIdentifiers.id_seedCBC.getId();

    public static final String  DES_EDE3_WRAP   = PKCSObjectIdentifiers.id_alg_CMS3DESwrap.getId();
    public static final String  AES128_WRAP     = NISTObjectIdentifiers.id_aes128_wrap.getId();
    public static final String  AES192_WRAP     = NISTObjectIdentifiers.id_aes192_wrap.getId();
    public static final String  AES256_WRAP     = NISTObjectIdentifiers.id_aes256_wrap.getId();
    public static final String  CAMELLIA128_WRAP = NTTObjectIdentifiers.id_camellia128_wrap.getId();
    public static final String  CAMELLIA192_WRAP = NTTObjectIdentifiers.id_camellia192_wrap.getId();
    public static final String  CAMELLIA256_WRAP = NTTObjectIdentifiers.id_camellia256_wrap.getId();
    public static final String  SEED_WRAP       = KISAObjectIdentifiers.id_npki_app_cmsSeed_wrap.getId();

    public static final String  ECDH_SHA1KDF    = X9ObjectIdentifiers.dhSinglePass_stdDH_sha1kdf_scheme.getId();
    public static final String  ECMQV_SHA1KDF   = X9ObjectIdentifiers.mqvSinglePass_sha1kdf_scheme.getId();

    final List oldRecipientInfoGenerators = new ArrayList();
    final List recipientInfoGenerators = new ArrayList();

    protected CMSAttributeTableGenerator unprotectedAttributeGenerator = null;

    protected OriginatorInfo originatorInfo;

    /**
     * base constructor
     */
    public CMSEnvelopedGenerator()
    {
    }

    public void setUnprotectedAttributeGenerator(CMSAttributeTableGenerator unprotectedAttributeGenerator)
    {
        this.unprotectedAttributeGenerator = unprotectedAttributeGenerator;
    }

    public void setOriginatorInfo(OriginatorInformation originatorInfo)
    {
        this.originatorInfo = originatorInfo.toASN1Structure();
    }

    /**
     * Add a generator to produce the recipient info required.
     * 
     * @param recipientGenerator a generator of a recipient info object.
     */
    public void addRecipientInfoGenerator(RecipientInfoGenerator recipientGenerator)
    {
        recipientInfoGenerators.add(recipientGenerator);
    }
}