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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.IOException;

import port.org.bouncycastle.util.Arrays;

/**
 * DER BMPString object.
 */
public class DERBMPString extends ASN1Primitive implements ASN1String {

	private char[] string;

	/**
	 * return a BMP String from the given object.
	 *
	 * @param obj
	 *            the object we want converted.
	 * @exception IllegalArgumentException
	 *                if the object cannot be converted.
	 * @return a DERBMPString instance, or null.
	 */
	public static DERBMPString getInstance(Object obj) {
		if ((obj == null) || (obj instanceof DERBMPString)) {
			return (DERBMPString) obj;
		}

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

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

	/**
	 * return a BMP 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 DERBMPString instance.
	 */
	public static DERBMPString getInstance(ASN1TaggedObject obj, boolean explicit) {
		ASN1Primitive o = obj.getObject();

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

	/**
	 * basic constructor - byte encoded string.
	 *
	 * @param string
	 *            the encoded BMP STRING to wrap.
	 */
	DERBMPString(byte[] string) {
		char[] cs = new char[string.length / 2];

		for (int i = 0; i != cs.length; i++) {
			cs[i] = (char) ((string[2 * i] << 8) | (string[(2 * i) + 1] & 0xff));
		}

		this.string = cs;
	}

	DERBMPString(char[] string) {
		this.string = string;
	}

	/**
	 * basic constructor
	 *
	 * @param string
	 *            a String to wrap as a BMP STRING.
	 */
	public DERBMPString(String string) {
		this.string = string.toCharArray();
	}

	@Override
	public String getString() {
		return new String(string);
	}

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

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

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

		DERBMPString s = (DERBMPString) o;

		return Arrays.areEqual(string, s.string);
	}

	@Override
	boolean isConstructed() {
		return false;
	}

	@Override
	int encodedLength() {
		return 1 + StreamUtil.calculateBodyLength(string.length * 2) + (string.length * 2);
	}

	@Override
	void encode(ASN1OutputStream out) throws IOException {
		out.write(BERTags.BMP_STRING);
		out.writeLength(string.length * 2);

		for (int i = 0; i != string.length; i++) {
			char c = string[i];

			out.write((byte) (c >> 8));
			out.write((byte) c);
		}
	}

}