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DSS Model contains the data model representation for DSS
There is a newer version: 6.0.d4j.2
package port.org.bouncycastle.asn1;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import port.org.bouncycastle.util.Arrays;

/**
 * DER UniversalString object.
 */
public class DERUniversalString extends ASN1Primitive implements ASN1String {

	private static final char[] table = {
		'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
	};
	private byte[] string;

	/**
	 * return a Universal String from the passed in object.
	 *
	 * @param obj
	 *            a DERUniversalString or an object that can be converted into one.
	 * @exception IllegalArgumentException
	 *                if the object cannot be converted.
	 * @return a DERUniversalString instance, or null
	 */
	public static DERUniversalString getInstance(Object obj) {
		if ((obj == null) || (obj instanceof DERUniversalString)) {
			return (DERUniversalString) obj;
		}

		if (obj instanceof byte[]) {
			try {
				return (DERUniversalString) fromByteArray((byte[]) obj);
			} catch (Exception e) {
				throw new IllegalArgumentException("encoding error getInstance: " + e.toString());
			}
		}

		throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
	}

	/**
	 * return a Universal String from a tagged object.
	 *
	 * @param obj
	 *            the tagged object holding the object we want
	 * @param explicit
	 *            true if the object is meant to be explicitly
	 *            tagged false otherwise.
	 * @exception IllegalArgumentException
	 *                if the tagged object cannot
	 *                be converted.
	 * @return a DERUniversalString instance, or null
	 */
	public static DERUniversalString getInstance(ASN1TaggedObject obj, boolean explicit) {
		ASN1Primitive o = obj.getObject();

		if (explicit || (o instanceof DERUniversalString)) {
			return getInstance(o);
		} else {
			return new DERUniversalString(((ASN1OctetString) o).getOctets());
		}
	}

	/**
	 * basic constructor - byte encoded string.
	 */
	public DERUniversalString(byte[] string) {
		this.string = string;
	}

	@Override
	public String getString() {
		StringBuffer buf = new StringBuffer("#");
		ByteArrayOutputStream bOut = new ByteArrayOutputStream();
		ASN1OutputStream aOut = new ASN1OutputStream(bOut);

		try {
			aOut.writeObject(this);
		} catch (IOException e) {
			throw new RuntimeException("internal error encoding BitString");
		}

		byte[] string = bOut.toByteArray();

		for (int i = 0; i != string.length; i++) {
			buf.append(table[(string[i] >>> 4) & 0xf]);
			buf.append(table[string[i] & 0xf]);
		}

		return buf.toString();
	}

	@Override
	public String toString() {
		return getString();
	}

	public byte[] getOctets() {
		return string;
	}

	@Override
	boolean isConstructed() {
		return false;
	}

	@Override
	int encodedLength() {
		return 1 + StreamUtil.calculateBodyLength(string.length) + string.length;
	}

	@Override
	void encode(ASN1OutputStream out) throws IOException {
		out.writeEncoded(BERTags.UNIVERSAL_STRING, this.getOctets());
	}

	@Override
	boolean asn1Equals(ASN1Primitive o) {
		if (!(o instanceof DERUniversalString)) {
			return false;
		}

		return Arrays.areEqual(string, ((DERUniversalString) o).string);
	}

	@Override
	public int hashCode() {
		return Arrays.hashCode(string);
	}

}