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package spring.turbo.util.crypto;

import java.security.*;

import static spring.turbo.util.crypto.Base64.encode;

/**
 * @author 应卓
 * @since 1.0.0
 */
public final class DSAKeys implements Keys {

    public static final int KEY_SIZE_512 = 512;

    private final String base64PublicKey;
    private final String base64PrivateKey;

    private DSAKeys(String base64PublicKey, String base64PrivateKey) {
        this.base64PublicKey = base64PublicKey;
        this.base64PrivateKey = base64PrivateKey;
    }

    public static DSAKeys create() {
        return create(KEY_SIZE_512);
    }

    public static DSAKeys create(int keySize) {
        try {
            KeyPairGenerator generator = KeyPairGenerator.getInstance("DSA");
            generator.initialize(keySize);
            KeyPair keyPair = generator.generateKeyPair();
            PublicKey publicKey = keyPair.getPublic();
            PrivateKey privateKey = keyPair.getPrivate();

            return new DSAKeys(
                    encode(publicKey.getEncoded()),
                    encode(privateKey.getEncoded())
            );

        } catch (NoSuchAlgorithmException e) {
            throw new AssertionError();
        }
    }

    public static DSAKeys fromString(String publicKey, String privateKey) {
        return new DSAKeys(publicKey, privateKey);
    }

    @Override
    public String getBase64PublicKey() {
        return this.base64PublicKey;
    }

    @Override
    public String getBase64PrivateKey() {
        return this.base64PrivateKey;
    }

}