package com.lowagie.bc.asn1; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.util.Enumeration; import java.util.Vector; public abstract class ASN1OctetString extends DERObject { byte[] string; /** * return an Octet 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. */ public static ASN1OctetString getInstance( ASN1TaggedObject obj, boolean explicit) { return getInstance(obj.getObject()); } /** * return an Octet String from the given object. * * @param obj the object we want converted. * @exception IllegalArgumentException if the object cannot be converted. */ public static ASN1OctetString getInstance( Object obj) { if (obj == null || obj instanceof ASN1OctetString) { return (ASN1OctetString)obj; } if (obj instanceof ASN1TaggedObject) { return getInstance(((ASN1TaggedObject)obj).getObject()); } if (obj instanceof ASN1Sequence) { Vector v = new Vector(); Enumeration e = ((ASN1Sequence)obj).getObjects(); while (e.hasMoreElements()) { v.addElement(e.nextElement()); } return new BERConstructedOctetString(v); } throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName()); } /** * @param string the octets making up the octet string. */ public ASN1OctetString( byte[] string) { this.string = string; } public ASN1OctetString( DEREncodable obj) { try { ByteArrayOutputStream bOut = new ByteArrayOutputStream(); DEROutputStream dOut = new DEROutputStream(bOut); dOut.writeObject(obj); dOut.close(); this.string = bOut.toByteArray(); } catch (IOException e) { throw new IllegalArgumentException("Error processing object : " + e.toString()); } } public byte[] getOctets() { return string; } public int hashCode() { byte[] b = this.getOctets(); int value = 0; for (int i = 0; i != b.length; i++) { value ^= (b[i] & 0xff) << (i % 4); } return value; } public boolean equals( Object o) { if (o == null || !(o instanceof DEROctetString)) { return false; } DEROctetString other = (DEROctetString)o; byte[] b1 = other.getOctets(); byte[] b2 = this.getOctets(); if (b1.length != b2.length) { return false; } for (int i = 0; i != b1.length; i++) { if (b1[i] != b2[i]) { return false; } } return true; } abstract void encode(DEROutputStream out) throws IOException; }