| 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 |
| * |
| * @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; |
| } |
| |
| 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(); |
| } |
| } |