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/**
 * 
 */
package org.mitre.jose.jwk;

import java.security.InvalidAlgorithmParameterException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.interfaces.ECPrivateKey;
import java.security.interfaces.ECPublicKey;
import java.security.spec.ECParameterSpec;

import com.nimbusds.jose.Algorithm;
import com.nimbusds.jose.jwk.ECKey;
import com.nimbusds.jose.jwk.ECKey.Curve;
import com.nimbusds.jose.jwk.KeyUse;

/**
 * @author jricher
 *
 */
public class ECKeyMaker {

	/**
	 * @param keySize
	 * @param keyUse
	 * @param keyAlg
	 * @param kid
	 * @return
	 */
    public static ECKey make(Curve crv, KeyUse keyUse, Algorithm keyAlg, String kid) {
    	
    	try {
	    	ECParameterSpec ecSpec = crv.toECParameterSpec();
	    	
	    	KeyPairGenerator generator = KeyPairGenerator.getInstance("EC");
	    	generator.initialize(ecSpec);
	    	
	    	KeyPair kp = generator.generateKeyPair();
	    	
	    	ECPublicKey pub = (ECPublicKey) kp.getPublic();
	    	ECPrivateKey priv = (ECPrivateKey) kp.getPrivate();

			ECKey ecKey = new ECKey.Builder(crv, pub)
					.privateKey(priv)
					.keyID(kid)
					.algorithm(keyAlg)
					.keyUse(keyUse)
					.build();

			return ecKey;
    	} catch (InvalidAlgorithmParameterException e) {
    		e.printStackTrace();
    		return null;
    	} catch (NoSuchAlgorithmException e) {
	        // TODO Auto-generated catch block
	        e.printStackTrace();
	        return null;
        }
    	
    }

}