package p3;

import com.google.common.io.BaseEncoding;
import org.apache.commons.codec.digest.DigestUtils;

import javax.crypto.Cipher;
import java.nio.charset.StandardCharsets;
import java.security.*;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.X509EncodedKeySpec;
import java.util.Base64;

public class EncodeDemo {

    /**
     * RSA公钥加密
     *
     * @param str    加密字符串
     * @param publicKey 公钥
     * @return 密文
     * @throws Exception 加密过程中的异常信息
     */
    public static String encrypt(String str, String publicKey) throws Exception {
        //base64编码的公钥
        byte[] decoded = org.apache.commons.codec.binary.Base64.decodeBase64(publicKey);
        RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decoded));
        //RSA加密
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, pubKey);
        String outStr = Base64.getEncoder().encodeToString(cipher.doFinal(str.getBytes("UTF-8")));
        return outStr;
    }

    public static void main(String[] args) throws Exception {

        // 正式环境 公钥
        String publicKey = "TUZ3d0RRWUpLb1pJaHZjTkFRRUJCUUFEU3dBd1NBSkJBS1RmNkNNMlNRb0ZwN2lvSUpIVjdCYUk1VTBSZVFiZ1UxWVlTQ0lKdVNJT1dmQldjNUZxZVVZckhqQnRMVHA0T3A2TnNsYnJmUjh3MVAxdFpzTG1OTFVDQXdFQUFRPT0=";
        // 明文
        String message = "Aa123456";
        System.out.println("原文:" + message);
        // 密码转md5
        String md5 = DigestUtils.md5Hex(message);
        // 公钥加密
        String messageEn = encrypt(md5, base64ToString(publicKey));
        System.out.println("密文:" + messageEn);
    }
    public static String base64ToString(String base64String) {
        return new String(BaseEncoding.base64().decode(base64String), StandardCharsets.UTF_8);
    }
}