http://www.bouncycastle.org/java.html: 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 to JDK 1.7. 
package org.bouncycastle.asn1.misc;

import org.bouncycastle.asn1.*;

public class CAST5CBCParameters
    extends ASN1Encodable
{
    DERInteger      keyLength;
    ASN1OctetString iv;

    public static CAST5CBCParameters getInstance(
        Object  o)
    {
        if (o instanceof CAST5CBCParameters)
        {
            return (CAST5CBCParameters)o;
        }
        else if (o instanceof ASN1Sequence)
        {
            return new CAST5CBCParameters((ASN1Sequence)o);
        }

        throw new IllegalArgumentException("unknown object in CAST5CBCParameter factory");
    }

    public CAST5CBCParameters(
        byte[]  iv,
        int     keyLength)
    {
        this.iv = new DEROctetString(iv);
        this.keyLength = new DERInteger(keyLength);
    }

    public CAST5CBCParameters(
        ASN1Sequence  seq)
    {
        iv = (ASN1OctetString)seq.getObjectAt(0);
        keyLength = (DERInteger)seq.getObjectAt(1);
    }

    public byte[] getIV()
    {
        return iv.getOctets();
    }

    public int getKeyLength()
    {
        return keyLength.getValue().intValue();
    }

    
Produce an object suitable for an ASN1OutputStream.

cast5CBCParameters ::= SEQUENCE {
                          iv         OCTET STRING DEFAULT 0,
                                 -- Initialization vector
                          keyLength  INTEGER
                                 -- Key length, in bits
                     }



/**
     * Produce an object suitable for an ASN1OutputStream.
     * <pre>
     * cast5CBCParameters ::= SEQUENCE {
     *                           iv         OCTET STRING DEFAULT 0,
     *                                  -- Initialization vector
     *                           keyLength  INTEGER
     *                                  -- Key length, in bits
     *                      }
     * </pre>
     */
    public DERObject toASN1Object()
    {
        ASN1EncodableVector  v = new ASN1EncodableVector();

        v.add(iv);
        v.add(keyLength);

        return new DERSequence(v);
    }
}