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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 and up.

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package org.bouncycastle.asn1.smime;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;

public class SMIMECapability
    extends ASN1Object
{
    /**
     * general preferences
     */
    public static final ASN1ObjectIdentifier preferSignedData = PKCSObjectIdentifiers.preferSignedData;
    public static final ASN1ObjectIdentifier canNotDecryptAny = PKCSObjectIdentifiers.canNotDecryptAny;
    public static final ASN1ObjectIdentifier sMIMECapabilitiesVersions = PKCSObjectIdentifiers.sMIMECapabilitiesVersions;

    /**
     * encryption algorithms preferences
     */
    public static final ASN1ObjectIdentifier dES_CBC = new ASN1ObjectIdentifier("1.3.14.3.2.7");
    public static final ASN1ObjectIdentifier dES_EDE3_CBC = PKCSObjectIdentifiers.des_EDE3_CBC;
    public static final ASN1ObjectIdentifier rC2_CBC = PKCSObjectIdentifiers.RC2_CBC;
    public static final ASN1ObjectIdentifier aES128_CBC = NISTObjectIdentifiers.id_aes128_CBC;
    public static final ASN1ObjectIdentifier aES192_CBC = NISTObjectIdentifiers.id_aes192_CBC;
    public static final ASN1ObjectIdentifier aES256_CBC = NISTObjectIdentifiers.id_aes256_CBC;
    
    private ASN1ObjectIdentifier capabilityID;
    private ASN1Encodable        parameters;

    public SMIMECapability(
        ASN1Sequence seq)
    {
        capabilityID = (ASN1ObjectIdentifier)seq.getObjectAt(0);

        if (seq.size() > 1)
        {
            parameters = (ASN1Primitive)seq.getObjectAt(1);
        }
    }

    public SMIMECapability(
        ASN1ObjectIdentifier capabilityID,
        ASN1Encodable        parameters)
    {
        this.capabilityID = capabilityID;
        this.parameters = parameters;
    }
    
    public static SMIMECapability getInstance(
        Object obj)
    {
        if (obj == null || obj instanceof SMIMECapability)
        {
            return (SMIMECapability)obj;
        }
        
        if (obj instanceof ASN1Sequence)
        {
            return new SMIMECapability((ASN1Sequence)obj);
        }
        
        throw new IllegalArgumentException("Invalid SMIMECapability");
    } 

    public ASN1ObjectIdentifier getCapabilityID()
    {
        return capabilityID;
    }

    public ASN1Encodable getParameters()
    {
        return parameters;
    }

    /**
     * Produce an object suitable for an ASN1OutputStream.
     *  
     * SMIMECapability ::= SEQUENCE {
     *     capabilityID OBJECT IDENTIFIER,
     *     parameters ANY DEFINED BY capabilityID OPTIONAL 
     * }
     * 
     */
    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(2);

        v.add(capabilityID);
        
        if (parameters != null)
        {
            v.add(parameters);
        }
        
        return new DERSequence(v);
    }
}