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This is a collection of JAVA libraries that implement Unbound cryptographic classes for JAVA provider, PKCS11 wrapper, cryptoki, and advapi

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package com.unbound.provider;

import com.unbound.client.Client;
import com.unbound.client.Partition;
import com.unbound.client.SignatureMode;
import com.unbound.client.SignatureOper;
import com.unbound.client.pkcs11.PKCS11Partition;
import com.unbound.client.pkcs11.PKCS11SignatureOper;
import com.unbound.common.crypto.EC;

import java.security.*;
import java.security.interfaces.ECPublicKey;

public class UBSchnorrSignature extends SignatureSpi
{
  private final SignatureOper oper = Client.getInstance().newSignatureOperation();
  private ECPublicKey pubKey = null;

  UBSchnorrSignature()
  {
    oper.mode = SignatureMode.Schnorr;
  }

  @Override
  protected void engineInitVerify(PublicKey publicKey) throws InvalidKeyException
  {
    if (!(publicKey instanceof ECPublicKey)) throw new InvalidKeyException("Invalid key type");
    if (EC.getCurve((ECPublicKey)publicKey)!=EC.P256k) throw new InvalidKeyException("Invalid curve");
    pubKey = (ECPublicKey)publicKey;
    oper.reset();
  }

  @Override
  protected void engineInitSign(PrivateKey privateKey) throws InvalidKeyException
  {
    if (!(privateKey instanceof UBECPrivateKey)) throw new InvalidKeyException("Invalid key type");
    if (EC.getCurve((UBECPrivateKey)privateKey)!=EC.P256k) throw new InvalidKeyException("Invalid curve");
    oper.keyObject = ((UBECPrivateKey)privateKey).object;
  }

  @Override
  protected void engineUpdate(byte b) throws SignatureException
  {
    oper.update(b);
  }

  @Override
  protected void engineUpdate(byte[] in, int inOffset, int inLen) throws SignatureException
  {
    oper.update(in, inOffset, inLen);
  }

  @Override
  protected byte[] engineSign() throws SignatureException
  {
    return oper.finalSign();
  }

  @Override
  protected boolean engineVerify(byte[] sigBytes) throws SignatureException
  {
    return ((PKCS11SignatureOper)oper).verifySchnorr((PKCS11Partition)Partition.getDefault(), pubKey, sigBytes);
  }

  @Override
  protected void engineSetParameter(String param, Object value) throws InvalidParameterException
  {
    throw new UnsupportedOperationException("setParameter() not supported");
  }

  @Override
  protected Object engineGetParameter(String param) throws InvalidParameterException
  {
    throw new UnsupportedOperationException("getParameter() not supported");
  }
}