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The Bouncy Castle Java APIs for ASN.1 extension and utility APIs used to support bcpkix and bctls 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 and used appropriately.

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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);
    }
}