package civitas.crypto.keyshare;
   
   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.stereotype.Controller;
   
   import civitas.crypto.CryptoError;
   import civitas.crypto.keypairshare.ElGamalKeyPairShare;
   import civitas.crypto.proofknowndisclog.ConstructProofKnowDiscLog;
   import civitas.crypto.proofknowndisclog.ElGamalProofKnowDiscLog;
  import civitas.crypto.publickey.ElGamalPublicKey;
  
  @Controller
  public class ConstructElGamalKeyShare {
  	@Autowired
  	ConstructProofKnowDiscLog constructProofKnowDiscLog;
  
  	@Autowired
  	VerifyElGamalKeyShare verifyElGamalKeyShare;
  
  	public ElGamalKeyShare apply(final ElGamalKeyPairShare kps) {
  		ElGamalKeyShare egks = apply(kps.pubKey(), constructProofKnowDiscLog.apply(kps.pubKey().params, kps.privKey()));
  		if (!verifyElGamalKeyShare.apply(egks)) {
  			throw new CryptoError("Cannot verify a newly created key share!");
  		}
  		return egks;
  	}
  
  	public ElGamalKeyShare apply(final ElGamalPublicKey k, final ElGamalProofKnowDiscLog proof) {
  		return new ElGamalKeyShare(k, proof);
  	}
  }