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package org.bouncycastle.asn1;
import java.io.IOException;
import java.math.BigInteger;
import org.bouncycastle.util.Arrays;
/**
* Class representing the ASN.1 INTEGER type.
*/
public class ASN1Integer
extends ASN1Primitive
{
byte[] bytes;
/**
* return an integer from the passed in object
*
* @param obj an ASN1Integer or an object that can be converted into one.
* @throws IllegalArgumentException if the object cannot be converted.
* @return an ASN1Integer instance.
*/
public static ASN1Integer getInstance(
Object obj)
{
if (obj == null || obj instanceof ASN1Integer)
{
return (ASN1Integer)obj;
}
if (obj instanceof byte[])
{
try
{
return (ASN1Integer)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 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.
* @throws IllegalArgumentException if the tagged object cannot
* be converted.
* @return an ASN1Integer instance.
*/
public static ASN1Integer getInstance(
ASN1TaggedObject obj,
boolean explicit)
{
ASN1Primitive o = obj.getObject();
if (explicit || o instanceof ASN1Integer)
{
return getInstance(o);
}
else
{
return new ASN1Integer(ASN1OctetString.getInstance(obj.getObject()).getOctets());
}
}
public ASN1Integer(
long value)
{
bytes = BigInteger.valueOf(value).toByteArray();
}
public ASN1Integer(
BigInteger value)
{
bytes = value.toByteArray();
}
public ASN1Integer(
byte[] bytes)
{
this(bytes, true);
}
ASN1Integer(byte[] bytes, boolean clone)
{
this.bytes = (clone) ? Arrays.clone(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...
* @return the BigInteger that results from treating this ASN.1 INTEGER as unsigned.
*/
public BigInteger getPositiveValue()
{
return new BigInteger(1, bytes);
}
boolean isConstructed()
{
return false;
}
int encodedLength()
{
return 1 + StreamUtil.calculateBodyLength(bytes.length) + bytes.length;
}
void encode(
ASN1OutputStream out)
throws IOException
{
out.writeEncoded(BERTags.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(
ASN1Primitive o)
{
if (!(o instanceof ASN1Integer))
{
return false;
}
ASN1Integer other = (ASN1Integer)o;
return Arrays.areEqual(bytes, other.bytes);
}
public String toString()
{
return getValue().toString();
}
}
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