package com.lht.utils;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
public class DesUtils {
	//对称解密
		public static String DesDecrypt(String src,String desKey, String desIv){			
			String decryptStr = "";			
			try {
				byte[] DESkey = desKey.getBytes();
		        byte[] DESIV = desIv.getBytes();
		        DESKeySpec keySpec = new DESKeySpec(DESkey);
				AlgorithmParameterSpec  iv = new IvParameterSpec(DESIV);// 设置向量
		        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");// 获得密钥工厂
		        SecretKey  key = keyFactory.generateSecret(keySpec);// 得到密钥对象
		        Cipher deCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");// 得到加密对象Cipher
		        deCipher.init(Cipher.DECRYPT_MODE, key, iv);// 设置工作模式为加密模式，给出密钥和向量
		        byte[] pasByte = deCipher.doFinal(Base64Utils.decode(src));	      
		        decryptStr = new String(pasByte, "UTF-8");;
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}// 设置密钥参数   
			return decryptStr;	
		//对称加密
		public static String DesEncrypt(String src,String desKey, String desIv){			
			String decryptStr = "";			
			try {
				byte[] DESkey = desKey.getBytes();
		        byte[] DESIV = desIv.getBytes();
		        DESKeySpec keySpec = new DESKeySpec(DESkey);
				AlgorithmParameterSpec  iv = new IvParameterSpec(DESIV);// 设置向量
		        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");// 获得密钥工厂
		        SecretKey  key = keyFactory.generateSecret(keySpec);// 得到密钥对象
		        Cipher deCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");// 得到加密对象Cipher
		        deCipher.init(Cipher.ENCRYPT_MODE, key, iv);// 设置工作模式为加密模式，给出密钥和向量
		        byte[] pasByte = deCipher.doFinal(src.getBytes("utf-8"));	      
		        decryptStr = Base64Utils.encode(pasByte) ;
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}// 设置密钥参数   
			return decryptStr;	
Rsa密钥对生成工具类
 
package com.lht.utils;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.RSAPublicKeySpec;
import java.security.spec.X509EncodedKeySpec;
public class RsaKeyHelper {
	public static final String RSA = "RSA";// 非对称加密密钥算法
     * 随机生成RSA密钥对
     * @param keyLength 密钥长度，范围：512～2048<br>
     *                  一般1024
     * @return
    public static KeyPair generateRSAKeyPair(int keyLength) {
        try {
            KeyPairGenerator kpg = KeyPairGenerator.getInstance(RSA);
            kpg.initialize(keyLength);
            return kpg.genKeyPair();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            return null;
     * 通过公钥byte[](publicKey.getEncoded())将公钥还原，适用于RSA算法
     * @param keyBytes
     * @return
     * @throws NoSuchAlgorithmException
     * @throws InvalidKeySpecException
    public static PublicKey getPublicKey(byte[] keyBytes) throws NoSuchAlgorithmException,
            InvalidKeySpecException {
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(RSA);
        PublicKey publicKey = keyFactory.generatePublic(keySpec);
        return publicKey;
     * 通过私钥byte[]将公钥还原，适用于RSA算法
     * @param keyBytes
     * @return
     * @throws NoSuchAlgorithmException
     * @throws InvalidKeySpecException
    public static PrivateKey getPrivateKey(byte[] keyBytes) throws NoSuchAlgorithmException,
            InvalidKeySpecException {
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(RSA);
        PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
        return privateKey;
     * 使用N、e值还原公钥
     * @param modulus
     * @param publicExponent
     * @return
     * @throws NoSuchAlgorithmException
     * @throws InvalidKeySpecException
    public static PublicKey getPublicKey(String modulus, String publicExponent)
            throws NoSuchAlgorithmException, InvalidKeySpecException {
        BigInteger bigIntModulus = new BigInteger(modulus);
        BigInteger bigIntPrivateExponent = new BigInteger(publicExponent);
        RSAPublicKeySpec keySpec = new RSAPublicKeySpec(bigIntModulus, bigIntPrivateExponent);
        KeyFactory keyFactory = KeyFactory.getInstance(RSA);
        PublicKey publicKey = keyFactory.generatePublic(keySpec);
        return publicKey;
     * 使用N、d值还原私钥
     * @param modulus
     * @param privateExponent
     * @return
     * @throws NoSuchAlgorithmException
     * @throws InvalidKeySpecException
    public static PrivateKey getPrivateKey(String modulus, String privateExponent)
            throws NoSuchAlgorithmException, InvalidKeySpecException {
        BigInteger bigIntModulus = new BigInteger(modulus);
        BigInteger bigIntPrivateExponent = new BigInteger(privateExponent);
        RSAPublicKeySpec keySpec = new RSAPublicKeySpec(bigIntModulus, bigIntPrivateExponent);
        KeyFactory keyFactory = KeyFactory.getInstance(RSA);
        PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
        return privateKey;
     * 从字符串中加载公钥
     * @param publicKeyStr 公钥数据字符串
     * @throws Exception 加载公钥时产生的异常
    public static PublicKey loadPublicKey(String publicKeyStr) throws Exception {
        try {
            byte[] buffer = Base64Utils.decode(publicKeyStr);
            KeyFactory keyFactory = KeyFactory.getInstance(RSA);
            X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer);
            return (RSAPublicKey) keyFactory.generatePublic(keySpec);
        } catch (NoSuchAlgorithmException e) {
            throw new Exception("无此算法");
        } catch (InvalidKeySpecException e) {
            throw new Exception("公钥非法");
        } catch (NullPointerException e) {
            throw new Exception("公钥数据为空");
     * 从字符串中加载私钥<br>
     * 加载时使用的是PKCS8EncodedKeySpec（PKCS#8编码的Key指令）。
     * @param privateKeyStr
     * @return
     * @throws Exception
    public static PrivateKey loadPrivateKey(String privateKeyStr) throws Exception {
        try {
            byte[] buffer = Base64Utils.decode(privateKeyStr);
            // X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer);
            PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(buffer);
            KeyFactory keyFactory = KeyFactory.getInstance(RSA);
            return (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
        } catch (NoSuchAlgorithmException e) {
            throw new Exception("无此算法");
        } catch (InvalidKeySpecException e) {
            throw new Exception("私钥非法");
        } catch (NullPointerException e) {
            throw new Exception("私钥数据为空");
     * 从文件中输入流中加载公钥
     * @param in 公钥输入流
     * @throws Exception 加载公钥时产生的异常
    public static PublicKey loadPublicKey(InputStream in) throws Exception {
        try {
            return loadPublicKey(readKey(in));
        } catch (IOException e) {
            throw new Exception("公钥数据流读取错误");
        } catch (NullPointerException e) {
            throw new Exception("公钥输入流为空");
     * 从文件中加载私钥
     * 私钥文件名
     * @return 是否成功
     * @throws Exception
    public static PrivateKey loadPrivateKey(InputStream in) throws Exception {
        try {
            return loadPrivateKey(readKey(in));
        } catch (IOException e) {
            throw new Exception("私钥数据读取错误");
        } catch (NullPointerException e) {
            throw new Exception("私钥输入流为空");
     * 读取密钥信息
     * @param in
     * @return
     * @throws IOException
    private static String readKey(InputStream in) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(in));
        String readLine = null;
        StringBuilder sb = new StringBuilder();
        while ((readLine = br.readLine()) != null) {
            if (readLine.charAt(0) == '-') {
                continue;
            } else {
                sb.append(readLine);
                sb.append('\r');
        return sb.toString();
     * 打印公钥信息
     * @param publicKey
    public static void printPublicKeyInfo(PublicKey publicKey) {
        RSAPublicKey rsaPublicKey = (RSAPublicKey) publicKey;
        System.out.println("----------RSAPublicKey----------");
        System.out.println("Modulus.length=" + rsaPublicKey.getModulus().bitLength());
        System.out.println("Modulus=" + rsaPublicKey.getModulus().toString());
        System.out.println("PublicExponent.length=" + rsaPublicKey.getPublicExponent().bitLength());
        System.out.println("PublicExponent=" + rsaPublicKey.getPublicExponent().toString());
    public static void printPrivateKeyInfo(PrivateKey privateKey) {
        RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) privateKey;
        System.out.println("----------RSAPrivateKey ----------");
        System.out.println("Modulus.length=" + rsaPrivateKey.getModulus().bitLength());
        System.out.println("Modulus=" + rsaPrivateKey.getModulus().toString());
        System.out.println("PrivateExponent.length=" + rsaPrivateKey.getPrivateExponent().bitLength());
        System.out.println("PrivatecExponent=" + rsaPrivateKey.getPrivateExponent().toString());
Rsa加密、解密、签名、验签工具类
 
package com.lht.utils;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.SignatureException;
import javax.crypto.Cipher;
public class RsaUtils {    
	public static final String SIGNATURE = "SHA256withRSA";//加密填充方式 
	public static final String ECB_PKCS1_PADDING = "RSA/ECB/PKCS1Padding";//加密填充方式 
     * 用公钥加密 <br>
     * 每次加密的字节数，不能超过密钥的长度值减去11
     * @param data 需加密数据的byte数据
     *             公钥
     * @return 加密后的byte型数据
    public static byte[] encryptData(byte[] data, PublicKey publicKey) {
        try {
            Cipher cipher = Cipher.getInstance(ECB_PKCS1_PADDING);
            // 编码前设定编码方式及密钥
            cipher.init(Cipher.ENCRYPT_MODE, publicKey);
            // 传入编码数据并返回编码结果
            return cipher.doFinal(data);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
     * 用私钥解密
     * @param encryptedData 经过encryptedData()加密返回的byte数据
     * @param privateKey    私钥
     * @return
    public static byte[] decryptData(byte[] encryptedData, PrivateKey privateKeyPkcs8) {
        try {
            Cipher cipher = Cipher.getInstance(ECB_PKCS1_PADDING);
            cipher.init(Cipher.DECRYPT_MODE, privateKeyPkcs8);
            return cipher.doFinal(encryptedData);
        } catch (Exception e) {
            return null;
     * 用私钥签名
     * @param data 需要进行签名的数据
     * @param privateKey    私钥
     * @return 签名数据 
     * @throws NoSuchAlgorithmException 
     * @throws InvalidKeyException 
     * @throws SignatureException 
    public static byte[] Sign(byte[] data, PrivateKey privateKeyPkcs8) {    
    		 Signature signature = Signature.getInstance(SIGNATURE);
             signature.initSign(privateKeyPkcs8);
             signature.update(data);
             return signature.sign();
    	}catch(Exception e){
    		return null;
     * 用公钥验签
     * @param data 需要进行签名的数据
     * @param publicKey    公钥
     * @return 
    public static boolean Verify(byte[] data, byte[] sign, PublicKey publicKey){    	
         Signature signature = Signature.getInstance(SIGNATURE);
         signature.initVerify(publicKey);
         signature.update(data);
         return signature.verify(sign);
    	}catch(Exception e){
    		return false;
Base64加解密工具类
 
package com.lht.utils;
import java.io.UnsupportedEncodingException;
public class Base64Utils
    private static char[] base64EncodeChars = new char[]
            { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
                    'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
                    'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5',
                    '6', '7', '8', '9', '+', '/' };
    private static byte[] base64DecodeChars = new byte[]
            { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
                    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53,
                    54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
                    12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29,
                    30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1,
                    -1, -1, -1 };
    public static String encode(byte[] data)
        StringBuffer sb = new StringBuffer();
        int len = data.length;
        int i = 0;
        int b1, b2, b3;
        while (i < len)
            b1 = data[i++] & 0xff;
            if (i == len)
                sb.append(base64EncodeChars[b1 >>> 2]);
                sb.append(base64EncodeChars[(b1 & 0x3) << 4]);
                sb.append("==");
                break;
            b2 = data[i++] & 0xff;
            if (i == len)
                sb.append(base64EncodeChars[b1 >>> 2]);
                sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]);
                sb.append(base64EncodeChars[(b2 & 0x0f) << 2]);
                sb.append("=");
                break;
            b3 = data[i++] & 0xff;
            sb.append(base64EncodeChars[b1 >>> 2]);
            sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]);
            sb.append(base64EncodeChars[((b2 & 0x0f) << 2) | ((b3 & 0xc0) >>> 6)]);
            sb.append(base64EncodeChars[b3 & 0x3f]);
        return sb.toString();
    public static byte[] decode(String str)
            return decodePrivate(str);
        } catch (UnsupportedEncodingException e)
            e.printStackTrace();
        return new byte[]
    private static byte[] decodePrivate(String str) throws UnsupportedEncodingException
        StringBuffer sb = new StringBuffer();
        byte[] data = null;
        data = str.getBytes("US-ASCII");
        int len = data.length;
        int i = 0;
        int b1, b2, b3, b4;
        while (i < len)
                b1 = base64DecodeChars[data[i++]];
            } while (i < len && b1 == -1);
            if (b1 == -1)
                break;
                b2 = base64DecodeChars[data[i++]];
            } while (i < len && b2 == -1);
            if (b2 == -1)
                break;
            sb.append((char) ((b1 << 2) | ((b2 & 0x30) >>> 4)));
                b3 = data[i++];
                if (b3 == 61)
                    return sb.toString().getBytes("iso8859-1");
                b3 = base64DecodeChars[b3];
            } while (i < len && b3 == -1);
            if (b3 == -1)
                break;
            sb.append((char) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2)));
                b4 = data[i++];
                if (b4 == 61)
                    return sb.toString().getBytes("iso8859-1");
                b4 = base64DecodeChars[b4];
            } while (i < len && b4 == -1);
            if (b4 == -1)
                break;
            sb.append((char) (((b3 & 0x03) << 6) | b4));
        return sb.toString().getBytes("iso8859-1");
github工程源码
 
https://github.com/lhtzbj12/java_android_encryption
                    前言C#、Golang、Python、Java（Android）之间Des、Rsa加解密互通系列之前言C#、Golang、Python、Java（Android）之间Des、Rsa加解密互通系列之C#C#、Golang、Python、Java（Android）之间Des、Rsa加解密互通系列之GolangC#、Golang、Python、Java（Android）之间Des、Rsa加解密...
				
参考文章:
https://www.cnblogs.com/linuxcat/p/14494630.html
https://www.cnblogs.com/niuu/p/10107212.html
https://blog.csdn.net/u012119316/article/details/111193890
python环境   python3.7.5
安装包: pip install pycryptodome  很重要
python版本的算法有个问题,就是不能加密中文
from Crypto
import jdk.internal.org.objectweb.asm.tree.TryCatchBlockNode;
import java.lang.reflect.Field;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security...
C#有自己的一套生成密钥、加解密的库，但是跟其他文互通比较费劲，经过一翻比较后，笔者选择了BouncyCastle这套库，而这套库的缺点是文档很少，只能参考Java的代码才把需求的功能实现。笔者下面提供的代码是经过多语言环境验证的代码，可以与其他语言互通。
Des对称加密工具类
using System;
using System.IO;
using System.Security.C...
				
public final class DesUtils {
    private static final String DES = "DES";
    private static final String KEY = "4YztMHI7PsT4rLZN";
    private DesUtils() {}
    private static byte[] enc...
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