org.bouncycastle.asn1.cryptopro.GOST28147Parameters Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bcprov-ext-debug-jdk18on Show documentation

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 Java 1.8 and later with debug enabled.

The newest version!

package org.bouncycastle.asn1.cryptopro;

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.ASN1TaggedObject;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.util.Arrays;

/**
 * ASN.1 algorithm identifier parameters for GOST-28147
 */
public class GOST28147Parameters
    extends ASN1Object
{
    private ASN1OctetString iv;
    private ASN1ObjectIdentifier paramSet;

    public static GOST28147Parameters getInstance(
        ASN1TaggedObject obj,
        boolean          explicit)
    {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }

    public static GOST28147Parameters getInstance(
        Object obj)
    {
        if (obj instanceof GOST28147Parameters)
        {
            return (GOST28147Parameters)obj;
        }

        if (obj != null)
        {
            return new GOST28147Parameters(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    public GOST28147Parameters(
        byte[] iv,
        ASN1ObjectIdentifier paramSet)
    {
        this.iv = new DEROctetString(Arrays.clone(iv));
        this.paramSet = paramSet;
    }

    private GOST28147Parameters(
        ASN1Sequence  seq)
    {
        Enumeration     e = seq.getObjects();

        iv = (ASN1OctetString)e.nextElement();
        paramSet = (ASN1ObjectIdentifier)e.nextElement();
    }

    /**
     *      * Gost28147-89-Parameters ::=
     *               SEQUENCE {
     *                       iv                   Gost28147-89-IV,
     *                       encryptionParamSet   OBJECT IDENTIFIER
     *                }
     *
     *   Gost28147-89-IV ::= OCTET STRING (SIZE (8))
     * 
     */
    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(2);

        v.add(iv);
        v.add(paramSet);

        return new DERSequence(v);
    }

    /**
     * Return the OID representing the sBox to use.
     *
     * @return the sBox OID.
     */
    public ASN1ObjectIdentifier getEncryptionParamSet()
    {
        return paramSet;
    }

    /**
     * Return the initialisation vector to use.
     *
     * @return the IV.
     */
    public byte[] getIV()
    {
        return Arrays.clone(iv.getOctets());
    }
}