package com.zoomyu.rn_zooma_alipay;


import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.spec.PKCS8EncodedKeySpec;

/**
 * Created by yuwei on 17-9-28.
 */

public class SignUtils {

    private static final String ALGORITHM = "RSA";

    private static final String SIGN_ALGORITHMS = "SHA1WithRSA";

    private static final String SIGN_SHA256RSA_ALGORITHMS = "SHA256WithRSA";

    private static final String DEFAULT_CHARSET = "UTF-8";

    private static String getAlgorithms(boolean rsa2) {
        return rsa2 ? SIGN_SHA256RSA_ALGORITHMS : SIGN_ALGORITHMS;
    }

    public static String sign(String content, String privateKey, boolean rsa2) {
        try {
            PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(
                    Base64.decode(privateKey));
            KeyFactory keyf = KeyFactory.getInstance(ALGORITHM);
            PrivateKey priKey = keyf.generatePrivate(priPKCS8);

            java.security.Signature signature = java.security.Signature
                    .getInstance(getAlgorithms(rsa2));

            signature.initSign(priKey);
            signature.update(content.getBytes(DEFAULT_CHARSET));

            byte[] signed = signature.sign();

            return Base64.encode(signed);
        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;
    }

}