org.bouncycastle.asn1

Class ASN1Integer

java.lang.Object

org.bouncycastle.asn1.ASN1Object

org.bouncycastle.asn1.ASN1Primitive

org.bouncycastle.asn1.ASN1Integer

All Implemented Interfaces:

ASN1Encodable, Encodable

Direct Known Subclasses:

DERInteger, SubsequentMessage

public class ASN1Integer
extends ASN1Primitive

Class representing the ASN.1 INTEGER type.

Constructor Summary

Constructors

Constructor and Description
ASN1Integer(java.math.BigInteger value) Construct an INTEGER from the passed in BigInteger value.
ASN1Integer(byte[] bytes) Construct an INTEGER from the passed in byte array.
ASN1Integer(long value) Construct an INTEGER from the passed in long value.

Method Summary

Modifier and Type	Method and Description
static ASN1Integer	getInstance(ASN1TaggedObject obj, boolean explicit) Return an Integer from a tagged object.
static ASN1Integer	getInstance(java.lang.Object obj) Return an integer from the passed in object.
java.math.BigInteger	getPositiveValue() in some cases positive values get crammed into a space, that's not quite big enough...
java.math.BigInteger	getValue()
int	hashCode()
java.lang.String	toString()

Methods inherited from class org.bouncycastle.asn1.ASN1Primitive

equals, fromByteArray, toASN1Primitive

Methods inherited from class org.bouncycastle.asn1.ASN1Object

getEncoded, getEncoded, hasEncodedTagValue, toASN1Object

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ASN1Integer

public ASN1Integer(long value)

Construct an INTEGER from the passed in long value.

Parameters:

value - the long representing the value desired.

ASN1Integer

public ASN1Integer(java.math.BigInteger value)

Construct an INTEGER from the passed in BigInteger value.

Parameters:

value - the BigInteger representing the value desired.

ASN1Integer

public ASN1Integer(byte[] bytes)

Construct an INTEGER from the passed in byte array.

NB: Strict Validation applied by default.

It has turned out that there are still a few applications that struggle with the ASN.1 BER encoding rules for an INTEGER as described in: https://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf Section 8.3.2.

Users can set the 'org.bouncycastle.asn1.allow_unsafe_integer' to 'true' and a looser validation will be applied. Users must recognise that this is not ideal and may pave the way for an exploit based around a faulty encoding in the future.

Parameters:

bytes - the byte array representing a 2's complement encoding of a BigInteger.

Method Detail

getInstance

public static ASN1Integer getInstance(java.lang.Object obj)

Return an integer from the passed in object.

Parameters:

obj - an ASN1Integer or an object that can be converted into one.

Returns:

an ASN1Integer instance.

Throws:

java.lang.IllegalArgumentException - if the object cannot be converted.

getInstance

public static ASN1Integer getInstance(ASN1TaggedObject obj,
                                      boolean explicit)

Return an Integer from a tagged object.

Parameters:

obj - the tagged object holding the object we want

explicit - true if the object is meant to be explicitly tagged false otherwise.

Returns:

an ASN1Integer instance.

Throws:

java.lang.IllegalArgumentException - if the tagged object cannot be converted.

getValue

public java.math.BigInteger getValue()

getPositiveValue

public java.math.BigInteger getPositiveValue()

in some cases positive values get crammed into a space, that's not quite big enough...

Returns:

the BigInteger that results from treating this ASN.1 INTEGER as unsigned.

hashCode

public int hashCode()

Specified by:

hashCode in class ASN1Primitive

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object