C#、Golang、Python、Java（Android）之间Des、Rsa加解密互通系列之Java(Android)

秒速五厘米 2021-09-19 02:20 458阅读 0赞

# 前言 #

1.  [C\#、Golang、Python、Java（Android）之间Des、Rsa加解密互通系列之前言][C_Golang_Python_Java_Android_Des_Rsa]
2.  [C\#、Golang、Python、Java（Android）之间Des、Rsa加解密互通系列之C\#][C_Golang_Python_Java_Android_Des_Rsa_C]
3.  [C\#、Golang、Python、Java（Android）之间Des、Rsa加解密互通系列之Golang][C_Golang_Python_Java_Android_Des_Rsa_Golang]
4.  [C\#、Golang、Python、Java（Android）之间Des、Rsa加解密互通系列之Python][C_Golang_Python_Java_Android_Des_Rsa_Python]
5.  [C\#、Golang、Python、Java（Android）之间Des、Rsa加解密互通系列之Java(Android)][C_Golang_Python_Java_Android_Des_Rsa_Java_Android]

# 代码 #

## Des对称加密工具类 ##

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
         * <p>
         * 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) {    
        	try{
        		 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){    	
        	try{
             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 };
    
        /**
         *加密
         */
        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();
        }
    
        /**
         * 解密
         */
        public static byte[] decode(String str)
        {
            try
            {
                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)
            {
    
                do
                {
                    b1 = base64DecodeChars[data[i++]];
                } while (i < len && b1 == -1);
                if (b1 == -1)
                    break;
    
                do
                {
                    b2 = base64DecodeChars[data[i++]];
                } while (i < len && b2 == -1);
                if (b2 == -1)
                    break;
                sb.append((char) ((b1 << 2) | ((b2 & 0x30) >>> 4)));
    
                do
                {
                    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)));
    
                do
                {
                    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][https_github.com_lhtzbj12_java_android_encryption]

[C_Golang_Python_Java_Android_Des_Rsa]: https://blog.csdn.net/lhtzbj12/article/details/84591521
[C_Golang_Python_Java_Android_Des_Rsa_C]: https://blog.csdn.net/lhtzbj12/article/details/84799557
[C_Golang_Python_Java_Android_Des_Rsa_Golang]: https://blog.csdn.net/lhtzbj12/article/details/84799827
[C_Golang_Python_Java_Android_Des_Rsa_Python]: https://blog.csdn.net/lhtzbj12/article/details/89194346
[C_Golang_Python_Java_Android_Des_Rsa_Java_Android]: https://blog.csdn.net/lhtzbj12/article/details/89525666
[https_github.com_lhtzbj12_java_android_encryption]: https://github.com/lhtzbj12/java_android_encryption