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/* see bouncycastle_license.txt */
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;
}
}
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