RSA解密出现 javax.crypto.BadPaddingException Create Breakpoint: Decryption error 解决过程

问题业务描述：
数据上传第三方接口需要对数据进行RSA加密验签，加密的数据本地demo是可以通过的线上加密数据对方无法解密。
报错内容：

javax.crypto.BadPaddingException: Decryption error
	at sun.security.rsa.RSAPadding.unpadV15(RSAPadding.java:379)
	at sun.security.rsa.RSAPadding.unpad(RSAPadding.java:290)
	at com.sun.crypto.provider.RSACipher.doFinal(RSACipher.java:358)
	at com.sun.crypto.provider.RSACipher.engineDoFinal(RSACipher.java:391)
	at javax.crypto.Cipher.doFinal(Cipher.java:2226)
	at com.bangdao.park.openapi.common.tools.RSAUtil.decryptByPublicKey(RSAUtil.java:218)
	at com.bangdao.park.openapi.common.tools.RSAUtil.main(RSAUtil.java:266)

分析问题：
无法解密主要问题可能是依赖包不一致，或者与对方环境不一致，根据报错内容可以可以看出主要是在： com.sun.crypto.provider.RSACipher.engineDoFinal 也就是
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm())，
**解决过程：**这时打印 logger.info(“provider: {}” , cipher.getProvider().getClass().getName());对应的类
打印结果是：
线上：provider: org.bouncycastle.jce.provider.BouncyCastleProvider
本地 ： provider: com.sun.crypto.provider.SunJCE
我们不难发现 本地环境和对方环境一致，与线上环境不一致。导致问题根本原因是java环境不一样，这在对接第三方接口是很容易发生的事情。这时我们执行 java -version发现
线上环境：

本地或者对方环境：

以上分析解决方案：提供者
在得到cipher时指定
源代码：

修改后代码：

总结： 对接外部接口时涉及加密时要保证依赖包一致性，环境一致性。
附万能的RSA加密Utils

`package com.bangdao.park.openapi.common.tools;

import com.alibaba.fastjson.JSONObject;
import com.sun.crypto.provider.SunJCE;
import org.apache.tomcat.util.codec.binary.Base64;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.crypto.Cipher;
import java.io.ByteArrayOutputStream;
import java.nio.charset.Charset;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Date;

import static java.util.regex.Pattern.compile;


/***
 * RSA公钥/私钥/签名工具包
 * 字符串格式的密钥在未在特殊说明情况下都为BASE64编码格式

 * 由于非对称加密速度极其缓慢，一般文件不使用它来加密而是使用对称加密，

 * 非对称加密算法可以用来对对称加密的密钥加密，这样保证密钥的安全也就保证了数据的安全
 * @author trace
 * @Date 2022-5-17
 * @version 1.0
 */
public class RSAUtil {
    private static Logger logger = LoggerFactory.getLogger(RSAUtil.class);

    /** *//**
     * 加密算法RSA
     */
    public static final String KEY_ALGORITHM = "RSA";

    /** *//**
     * 签名算法
     */
    public static final String SIGNATURE_ALGORITHM = "MD5withRSA";

    /** *//**
     * RSA最大加密明文大小
     */
    private static final int MAX_ENCRYPT_BLOCK = 117;
    private static final int MAX_DECRYPT_BLOCK = 128;


    private static final String PUBLIC_KEY ="publicKey";
    private static final String PRIVATE_KEY ="privateKey";

    /** *//**
     * <p>
     * 用私钥对信息生成数字签名
     * </p>
     *
     * @param content 已加密数据
     * @param privateKey 私钥(BASE64编码)
     *
     * @return
     * @throws Exception
     */
    public static String sign(String content, String privateKey) throws Exception {
        byte[] keyBytes = Base64.decodeBase64(privateKey);
        byte[] data = content.getBytes(Charset.forName("UTF-8"));
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        RSAPrivateKey privateK = (RSAPrivateKey) keyFactory.generatePrivate(pkcs8KeySpec);
        Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
        signature.initSign(privateK);
        signature.update(data);
        return Base64.encodeBase64String(signature.sign());
    }

    //ASN1Primitive asn1Prime = new ASN1InputStream(decoded).readObject();
    //
    //	org.bouncycastle.asn1.pkcs.RSAPublicKey rsaPub = org.bouncycastle.asn1.pkcs.RSAPublicKey.getInstance(asn1Prime);
    //



    /** *//**
     * <p>
     * 私钥加密
     * </p>
     *
     * @param privateKey 源数据
     * @param privateKey 私钥(BASE64编码)
     * @return
     * @throws Exception
     */


    public static String encryptByPrivateKey(String content, String privateKey)
            throws Exception {
        compile("com.sun.crypto.provider.SunJCE");
        byte[] keyBytes = Base64.decodeBase64(privateKey);
        byte[] data = content.getBytes(Charset.forName("UTF-8"));
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        RSAPrivateKey privateK = (RSAPrivateKey) keyFactory.generatePrivate(pkcs8KeySpec);
        SunJCE provider=new com.sun.crypto.provider.SunJCE();
        Security.addProvider(provider);
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm(),provider);
        cipher.init(Cipher.ENCRYPT_MODE, privateK);
        logger.info("provider: {}" , cipher.getProvider().getClass().getName());
        int inputLen = data.length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int offSet = 0;
        byte[] cache;
        int i = 0;
        // 对数据分段加密
        while (inputLen - offSet > 0) {
            if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
                cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(data, offSet, inputLen - offSet);
            }
            out.write(cache, 0, cache.length);
            i++;
            offSet = i * MAX_ENCRYPT_BLOCK;
        }
        byte[] encryptedData = out.toByteArray();
        out.close();
        return  Base64.encodeBase64String(encryptedData);
    }

    public static String encryptByPublicKey(String content, String publicKey) throws Exception {
        compile("com.sun.crypto.provider.SunJCE");
        byte[] data = content.getBytes(Charset.forName("UTF-8"));
        byte[] keyBytes = Base64.decodeBase64(publicKey);
        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        Key publicK = keyFactory.generatePublic(x509KeySpec);
        // 对数据加密
        SunJCE provider=new com.sun.crypto.provider.SunJCE();
        Security.addProvider(provider);
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm(),provider);
        cipher.init(Cipher.ENCRYPT_MODE, publicK);
        int inputLen = data.length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int offSet = 0;
        byte[] cache;
        int i = 0;
        // 对数据分段加密
        while (inputLen - offSet > 0) {
            if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
                cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(data, offSet, inputLen - offSet);
            }
            out.write(cache, 0, cache.length);
            i++;
            offSet = i * MAX_ENCRYPT_BLOCK;
        }
        byte[] encryptedData = out.toByteArray();
        out.close();
        return Base64.encodeBase64String(encryptedData);

    }

    public static String decryptByPrivateKey(String dataStr, String privateKeyStr) throws Exception {
        compile("com.sun.crypto.provider.SunJCE");
        byte[] encryptedData = Base64.decodeBase64(dataStr.getBytes("UTF-8"));
        PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyStr));
        KeyFactory factory = KeyFactory.getInstance("RSA");
        PrivateKey privateKey = factory.generatePrivate(pkcs8EncodedKeySpec);
        //RSA加密
        SunJCE provider=new com.sun.crypto.provider.SunJCE();
        Security.addProvider(provider);
        Cipher cipher = Cipher.getInstance("RSA",provider);
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        int inputLen = encryptedData.length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int offSet = 0;
        byte[] cache;
        int i = 0;
        // 对数据分段解密
        while (inputLen - offSet > 0) {
            if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
                cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
            }
            out.write(cache, 0, cache.length);
            i++;
            offSet = i * MAX_DECRYPT_BLOCK;
        }
        byte[] decryptedData = out.toByteArray();
        out.close();
        String outStr = new String(decryptedData,"UTF-8");
        return outStr;
    }

    public static String decryptByPublicKey(String dataStr, String publicKey) throws Exception {
        compile("com.sun.crypto.provider.SunJCE");
        byte[] data = Base64.decodeBase64(dataStr);
        // 得到私钥
        byte[] keyBytes = Base64.decodeBase64(publicKey.getBytes());
        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        Key publicK = keyFactory.generatePublic(x509KeySpec);
        SunJCE provider=new com.sun.crypto.provider.SunJCE();
        Security.addProvider(provider);

        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm(),provider);
        cipher.init(Cipher.DECRYPT_MODE, publicK);
        // SealedObject obj = new SealedObject(data, cipher);
        int inputLen = data.length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int offSet = 0;
        byte[] cache;
        int i = 0;
        // 对数据分段解�?
        while (inputLen - offSet > 0) {
            if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
                cache = cipher.doFinal(data, offSet, MAX_DECRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(data, offSet, inputLen - offSet);
            }
            out.write(cache, 0, cache.length);
            i++;
            offSet = i * MAX_DECRYPT_BLOCK;
        }
        byte[] decryptedData = out.toByteArray();
        out.close();
        //byte[] messageBytes = (byte[]) obj.getObject(cipher);
        return new String(decryptedData);
    }
}

`