package com.lowagie.bc.asn1; import java.io.IOException; import java.math.BigInteger; public class DERInteger extends DERObject { byte[] bytes; /** * return an integer from the passed in object * * @exception IllegalArgumentException if the object cannot be converted. */ public static DERInteger getInstance( Object obj) { if (obj == null || obj instanceof DERInteger) { return (DERInteger)obj; } if (obj instanceof ASN1OctetString) { return new DERInteger(((ASN1OctetString)obj).getOctets()); } if (obj instanceof ASN1TaggedObject) { return getInstance(((ASN1TaggedObject)obj).getObject()); } throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName()); } /** * return an Integer 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 DERInteger getInstance( ASN1TaggedObject obj, boolean explicit) { return getInstance(obj.getObject()); } public DERInteger( int value) { bytes = BigInteger.valueOf(value).toByteArray(); } public DERInteger( BigInteger value) { bytes = value.toByteArray(); } public DERInteger( byte[] bytes) { this.bytes = bytes; } public BigInteger getValue() { return new BigInteger(bytes); } /** * in some cases positive values get crammed into a space, * that's not quite big enough... */ public BigInteger getPositiveValue() { return new BigInteger(1, bytes); } void encode( DEROutputStream out) throws IOException { out.writeEncoded(INTEGER, bytes); } public int hashCode() { int value = 0; for (int i = 0; i != bytes.length; i++) { value ^= (bytes[i] & 0xff) << (i % 4); } return value; } public boolean equals( Object o) { if (o == null || !(o instanceof DERInteger)) { return false; } DERInteger other = (DERInteger)o; if (bytes.length != other.bytes.length) { return false; } for (int i = 0; i != bytes.length; i++) { if (bytes[i] != other.bytes[i]) { return false; } } return true; } }