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package spring.turbo.module.security.jwt;

import spring.turbo.util.crypto.Base64;

import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.interfaces.ECPrivateKey;
import java.security.interfaces.ECPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

/**
 * @author 应卓
 * @since 1.0.0
 */
abstract class ECDSAAlgorithmFactory implements AlgorithmFactory {

    private static final String EC = "EC";

    private byte[] decryptBase64(String key) {
        return Base64.toBytes(key);
    }

    protected ECPublicKey toPublicKey(String key) {
        try {
            byte[] bytes = decryptBase64(key);
            X509EncodedKeySpec spec = new X509EncodedKeySpec(bytes);
            KeyFactory factory = KeyFactory.getInstance(EC);
            java.security.PublicKey result = factory.generatePublic(spec);
            return (ECPublicKey) result;
        } catch (NoSuchAlgorithmException e) {
            throw new AssertionError();
        } catch (InvalidKeySpecException e) {
            throw new IllegalArgumentException(e.getMessage(), e);
        }
    }

    protected ECPrivateKey toPrivateKey(String key) {
        try {
            byte[] bytes = decryptBase64(key);
            PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(bytes);
            KeyFactory factory = KeyFactory.getInstance(EC);
            java.security.PrivateKey result = factory.generatePrivate(spec);
            return (ECPrivateKey) result;
        } catch (NoSuchAlgorithmException e) {
            throw new AssertionError();
        } catch (InvalidKeySpecException e) {
            throw new IllegalArgumentException(e.getMessage(), e);
        }
    }

}