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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.

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package org.bouncycastle.pqc.asn1;

import java.math.BigInteger;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
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.asn1.DERTaggedObject;
import org.bouncycastle.util.Arrays;

/**
 * XMMSMTPrivateKey
 * 
 *     XMMSMTPrivateKey ::= SEQUENCE {
 *         version INTEGER -- 0
 *         keyData SEQUENCE {
 *            index         INTEGER
 *            secretKeySeed OCTET STRING
 *            secretKeyPRF  OCTET STRING
 *            publicSeed    OCTET STRING
 *            root          OCTET STRING
 *         }
 *         bdsState CHOICE {
 *            platformSerialization [0] OCTET STRING
 *         } OPTIONAL
 *    }
 * 
*/ public class XMSSMTPrivateKey extends ASN1Object { private final int index; private final byte[] secretKeySeed; private final byte[] secretKeyPRF; private final byte[] publicSeed; private final byte[] root; private final byte[] bdsState; public XMSSMTPrivateKey(int index, byte[] secretKeySeed, byte[] secretKeyPRF, byte[] publicSeed, byte[] root, byte[] bdsState) { this.index = index; this.secretKeySeed = Arrays.clone(secretKeySeed); this.secretKeyPRF = Arrays.clone(secretKeyPRF); this.publicSeed = Arrays.clone(publicSeed); this.root = Arrays.clone(root); this.bdsState = Arrays.clone(bdsState); } private XMSSMTPrivateKey(ASN1Sequence seq) { if (!ASN1Integer.getInstance(seq.getObjectAt(0)).getValue().equals(BigInteger.valueOf(0))) { throw new IllegalArgumentException("unknown version of sequence"); } if (seq.size() != 2 && seq.size() != 3) { throw new IllegalArgumentException("key sequence wrong size"); } ASN1Sequence keySeq = ASN1Sequence.getInstance(seq.getObjectAt(1)); this.index = ASN1Integer.getInstance(keySeq.getObjectAt(0)).getValue().intValue(); this.secretKeySeed = Arrays.clone(DEROctetString.getInstance(keySeq.getObjectAt(1)).getOctets()); this.secretKeyPRF = Arrays.clone(DEROctetString.getInstance(keySeq.getObjectAt(2)).getOctets()); this.publicSeed = Arrays.clone(DEROctetString.getInstance(keySeq.getObjectAt(3)).getOctets()); this.root = Arrays.clone(DEROctetString.getInstance(keySeq.getObjectAt(4)).getOctets()); if(seq.size() == 3) { this.bdsState = Arrays.clone(DEROctetString.getInstance(ASN1TaggedObject.getInstance(seq.getObjectAt(2)), true).getOctets()); } else { this.bdsState = null; } } public static XMSSMTPrivateKey getInstance(Object o) { if (o instanceof XMSSMTPrivateKey) { return (XMSSMTPrivateKey)o; } else if (o != null) { return new XMSSMTPrivateKey(ASN1Sequence.getInstance(o)); } return null; } public int getIndex() { return index; } public byte[] getSecretKeySeed() { return Arrays.clone(secretKeySeed); } public byte[] getSecretKeyPRF() { return Arrays.clone(secretKeyPRF); } public byte[] getPublicSeed() { return Arrays.clone(publicSeed); } public byte[] getRoot() { return Arrays.clone(root); } public byte[] getBdsState() { return Arrays.clone(bdsState); } public ASN1Primitive toASN1Primitive() { ASN1EncodableVector v = new ASN1EncodableVector(); v.add(new ASN1Integer(0)); // version ASN1EncodableVector vK = new ASN1EncodableVector(); vK.add(new ASN1Integer(index)); vK.add(new DEROctetString(secretKeySeed)); vK.add(new DEROctetString(secretKeyPRF)); vK.add(new DEROctetString(publicSeed)); vK.add(new DEROctetString(root)); v.add(new DERSequence(vK)); v.add(new DERTaggedObject(true, 0, new DEROctetString(bdsState))); return new DERSequence(v); } }




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