package org.bouncycastle.asn1;

import java.io.IOException;
import java.math.BigInteger;

import org.bouncycastle.util.Arrays;

public class DERInteger
    extends ASN1Object
{
    byte[]      bytes;

    
return an integer from the passed in object
Throws:
  • IllegalArgumentException – if the object cannot be converted.
/** * 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; } throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName()); }
return an Integer from a tagged object.
Params:
  • obj – the tagged object holding the object we want
  • explicit – true if the object is meant to be explicitly tagged false otherwise.
Throws:
/** * 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) { DERObject o = obj.getObject(); if (explicit || o instanceof DERInteger) { return getInstance(o); } else { return new ASN1Integer(ASN1OctetString.getInstance(obj.getObject()).getOctets()); } } 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...
/** * 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; } boolean asn1Equals( DERObject o) { if (!(o instanceof DERInteger)) { return false; } DERInteger other = (DERInteger)o; return Arrays.areEqual(bytes, other.bytes); } public String toString() { return getValue().toString(); } }