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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 with debug enabled.
package org.bouncycastle.asn1.x9;
import java.util.Enumeration;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERSequence;
/**
* ASN.1 def for Diffie-Hellman key exchange KeySpecificInfo structure. See
* RFC 2631, or X9.42, for further details.
*
* KeySpecificInfo ::= SEQUENCE {
* algorithm OBJECT IDENTIFIER,
* counter OCTET STRING SIZE (4..4)
* }
*
*/
public class KeySpecificInfo
extends ASN1Object
{
private ASN1ObjectIdentifier algorithm;
private ASN1OctetString counter;
/**
* Base constructor.
*
* @param algorithm algorithm identifier for the CEK.
* @param counter initial counter value for key derivation.
*/
public KeySpecificInfo(
ASN1ObjectIdentifier algorithm,
ASN1OctetString counter)
{
this.algorithm = algorithm;
this.counter = counter;
}
/**
* Return a KeySpecificInfo object from the passed in object.
*
* @param obj an object for conversion or a byte[].
* @return a KeySpecificInfo
*/
public static KeySpecificInfo getInstance(Object obj)
{
if (obj instanceof KeySpecificInfo)
{
return (KeySpecificInfo)obj;
}
else if (obj != null)
{
return new KeySpecificInfo(ASN1Sequence.getInstance(obj));
}
return null;
}
private KeySpecificInfo(
ASN1Sequence seq)
{
Enumeration e = seq.getObjects();
algorithm = (ASN1ObjectIdentifier)e.nextElement();
counter = (ASN1OctetString)e.nextElement();
}
/**
* The object identifier for the CEK wrapping algorithm.
*
* @return CEK wrapping algorithm OID.
*/
public ASN1ObjectIdentifier getAlgorithm()
{
return algorithm;
}
/**
* The initial counter value for key derivation.
*
* @return initial counter value as a 4 byte octet string (big endian).
*/
public ASN1OctetString getCounter()
{
return counter;
}
/**
* Return an ASN.1 primitive representation of this object.
*
* @return a DERSequence containing the parameter values.
*/
public ASN1Primitive toASN1Primitive()
{
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(algorithm);
v.add(counter);
return new DERSequence(v);
}
}
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