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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 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.cms;

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

import org.bouncycastle.asn1.cms.OriginatorInfo;
import org.bouncycastle.asn1.kisa.KISAObjectIdentifiers;
import org.bouncycastle.asn1.misc.MiscObjectIdentifiers;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.ntt.NTTObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.sec.SECObjectIdentifiers;
import org.bouncycastle.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        = MiscObjectIdentifiers.as_sys_sec_alg_ideaCBC.getId();
    public static final String  CAST5_CBC       = MiscObjectIdentifiers.cast5CBC.getId();
    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();
    public static final String  ECMQV_SHA224KDF = SECObjectIdentifiers.mqvSinglePass_sha224kdf_scheme.getId();
    public static final String  ECMQV_SHA256KDF = SECObjectIdentifiers.mqvSinglePass_sha256kdf_scheme.getId();
    public static final String  ECMQV_SHA384KDF = SECObjectIdentifiers.mqvSinglePass_sha384kdf_scheme.getId();
    public static final String  ECMQV_SHA512KDF = SECObjectIdentifiers.mqvSinglePass_sha512kdf_scheme.getId();

    final List recipientInfoGenerators = new ArrayList();

    protected CMSAttributeTableGenerator unprotectedAttributeGenerator = null;

    protected OriginatorInfo originatorInfo;

    /**
     * base constructor
     */
    protected 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);
    }
}