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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8. Note: this package includes the NTRU encryption algorithms.
package org.bouncycastle.asn1.x509;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERSequence;
public class AlgorithmIdentifier
extends ASN1Object
{
private ASN1ObjectIdentifier algorithm;
private ASN1Encodable parameters;
public static AlgorithmIdentifier getInstance(
ASN1TaggedObject obj,
boolean explicit)
{
return getInstance(ASN1Sequence.getInstance(obj, explicit));
}
public static AlgorithmIdentifier getInstance(
Object obj)
{
if (obj instanceof AlgorithmIdentifier)
{
return (AlgorithmIdentifier)obj;
}
else if (obj != null)
{
return new AlgorithmIdentifier(ASN1Sequence.getInstance(obj));
}
return null;
}
public AlgorithmIdentifier(
ASN1ObjectIdentifier algorithm)
{
this.algorithm = algorithm;
}
public AlgorithmIdentifier(
ASN1ObjectIdentifier algorithm,
ASN1Encodable parameters)
{
this.algorithm = algorithm;
this.parameters = parameters;
}
private AlgorithmIdentifier(
ASN1Sequence seq)
{
if (seq.size() < 1 || seq.size() > 2)
{
throw new IllegalArgumentException("Bad sequence size: "
+ seq.size());
}
algorithm = ASN1ObjectIdentifier.getInstance(seq.getObjectAt(0));
if (seq.size() == 2)
{
parameters = seq.getObjectAt(1);
}
else
{
parameters = null;
}
}
public ASN1ObjectIdentifier getAlgorithm()
{
return algorithm;
}
public ASN1Encodable getParameters()
{
return parameters;
}
/**
* Produce an object suitable for an ASN1OutputStream.
*
* AlgorithmIdentifier ::= SEQUENCE {
* algorithm OBJECT IDENTIFIER,
* parameters ANY DEFINED BY algorithm OPTIONAL }
*
*/
public ASN1Primitive toASN1Primitive()
{
ASN1EncodableVector v = new ASN1EncodableVector(2);
v.add(algorithm);
if (parameters != null)
{
v.add(parameters);
}
return new DERSequence(v);
}
}