分享2个Java转C#加密解密的算法

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最近老是碰到和其他项目对接,对方项目采用JAVA,对于调用api时通常会 设计到对参数的加密解密。这时候就需要把对方的加密算法用C#实现一遍。

直接上代码。

Java

 private static byte[] iv = 1,2,3,4,5,6,7,8;    
    public static String encryptDES(String encryptString, String encryptKey) throws Exception     
//      IvParameterSpec zeroIv = new IvParameterSpec(new byte[8]);    
        IvParameterSpec zeroIv = new IvParameterSpec(iv);    
        SecretKeySpec key = new SecretKeySpec(encryptKey.getBytes("utf-8"), "DES");    
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");    
        cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv);    
        byte[] encryptedData = cipher.doFinal(encryptString.getBytes("utf-8"));    
         
        return Base64_BAK.encode(encryptedData);    
        
    public static String decryptDES(String decryptString, String decryptKey) throws Exception     
        byte[] byteMi = new Base64_BAK().decode(decryptString);    
        IvParameterSpec zeroIv = new IvParameterSpec(iv);    
//      IvParameterSpec zeroIv = new IvParameterSpec(new byte[8]);    
        SecretKeySpec key = new SecretKeySpec(decryptKey.getBytes("utf-8"), "DES");    
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");    
        cipher.init(Cipher.DECRYPT_MODE, key, zeroIv);    
        byte decryptedData[] = cipher.doFinal(byteMi);    
        String retrdecryptedData = new String(decryptedData,"UTF-8");
        return retrdecryptedData;    
       

  对字符进行编码的代码

class Base64_BAK     
    private static final char[] legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();    
    /**  
     * data[]进行编码  
     * @param data  
     * @return  
     */    
        public static String encode(byte[] data)     
            int start = 0;    
            int len = data.length;    
            StringBuffer buf = new StringBuffer(data.length * 3 / 2);    
    
            int end = len - 3;    
            int i = start;    
            int n = 0;    
    
            while (i <= end)     
                int d = ((((int) data[i]) & 0x0ff) << 16)    
                        | ((((int) data[i + 1]) & 0x0ff) << 8)    
                        | (((int) data[i + 2]) & 0x0ff);    
    
                buf.append(legalChars[(d >> 18) & 63]);    
                buf.append(legalChars[(d >> 12) & 63]);    
                buf.append(legalChars[(d >> 6) & 63]);    
                buf.append(legalChars[d & 63]);    
    
                i += 3;    
    
                if (n++ >= 14)     
                    n = 0;    
                    buf.append(" ");    
                    
                
    
            if (i == start + len - 2)     
                int d = ((((int) data[i]) & 0x0ff) << 16)    
                        | ((((int) data[i + 1]) & 255) << 8);    
    
                buf.append(legalChars[(d >> 18) & 63]);    
                buf.append(legalChars[(d >> 12) & 63]);    
                buf.append(legalChars[(d >> 6) & 63]);    
                buf.append("=");    
             else if (i == start + len - 1)     
                int d = (((int) data[i]) & 0x0ff) << 16;    
    
                buf.append(legalChars[(d >> 18) & 63]);    
                buf.append(legalChars[(d >> 12) & 63]);    
                buf.append("==");    
                
    
            return buf.toString();    
            
    
        private static int decode(char c)     
            if (c >= ‘A‘ && c <= ‘Z‘)    
                return ((int) c) - 65;    
            else if (c >= ‘a‘ && c <= ‘z‘)    
                return ((int) c) - 97 + 26;    
            else if (c >= ‘0‘ && c <= ‘9‘)    
                return ((int) c) - 48 + 26 + 26;    
            else    
                switch (c)     
                case ‘+‘:    
                    return 62;    
                case ‘/‘:    
                    return 63;    
                case ‘=‘:    
                    return 0;    
                default:    
                    throw new RuntimeException("unexpected code: " + c);    
                    
            
    
        /**  
         * Decodes the given Base64 encoded String to a new byte array. The byte  
         * array holding the decoded data is returned.  
         */    
    
        public static byte[] decode(String s)     
    
            ByteArrayOutputStream bos = new ByteArrayOutputStream();    
            try     
                decode(s, bos);    
             catch (IOException e)     
                throw new RuntimeException();    
                
            byte[] decodedBytes = bos.toByteArray();    
            try     
                bos.close();    
                bos = null;    
             catch (IOException ex)     
                System.err.println("Error while decoding BASE64: " + ex.toString());    
                
            return decodedBytes;    
            
    
        private static void decode(String s, OutputStream os) throws IOException     
            int i = 0;    
    
            int len = s.length();    
    
            while (true)     
                while (i < len && s.charAt(i) <= ‘ ‘)    
                    i++;    
    
                if (i == len)    
                    break;    
    
                int tri = (decode(s.charAt(i)) << 18)    
                        + (decode(s.charAt(i + 1)) << 12)    
                        + (decode(s.charAt(i + 2)) << 6)    
                        + (decode(s.charAt(i + 3)));    
    
                os.write((tri >> 16) & 255);    
                if (s.charAt(i + 2) == ‘=‘)    
                    break;    
                os.write((tri >> 8) & 255);    
                if (s.charAt(i + 3) == ‘=‘)    
                    break;    
                os.write(tri & 255);    
    
                i += 4;    
                
    

  对应的C#加密和解密算法如下

   static String encode(byte[] data)
        
            int start = 0;
            int len = data.Length;
            StringBuilder buf = new StringBuilder(data.Length * 3 / 2);
            var legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".ToCharArray();
            int end = len - 3;
            int i = start;
            int n = 0;

            while (i <= end)
            
                int d = ((((int)data[i]) & 0x0ff) << 16)
                        | ((((int)data[i + 1]) & 0x0ff) << 8)
                        | (((int)data[i + 2]) & 0x0ff);

                buf.Append(legalChars[(d >> 18) & 63]);
                buf.Append(legalChars[(d >> 12) & 63]);
                buf.Append(legalChars[(d >> 6) & 63]);
                buf.Append(legalChars[d & 63]);

                i += 3;

                if (n++ >= 14)
                
                    n = 0;
                    buf.Append(" ");
                
            

            if (i == start + len - 2)
            
                int d = ((((int)data[i]) & 0x0ff) << 16)
                        | ((((int)data[i + 1]) & 255) << 8);

                buf.Append(legalChars[(d >> 18) & 63]);
                buf.Append(legalChars[(d >> 12) & 63]);
                buf.Append(legalChars[(d >> 6) & 63]);
                buf.Append("=");
            
            else if (i == start + len - 1)
            
                int d = (((int)data[i]) & 0x0ff) << 16;

                buf.Append(legalChars[(d >> 18) & 63]);
                buf.Append(legalChars[(d >> 12) & 63]);
                buf.Append("==");
            

            return buf.ToString();
        
        private static string Encrypt(string str, string sKey, byte[] iv)
        
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray = Encoding.Default.GetBytes(str);
            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);// 密匙
            //byte[] iv =  1, 2, 3, 4, 5, 6, 7, 8 ;
            des.IV = iv;// 初始化向量
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            var retB = encode(ms.ToArray());
            return retB;
        

        private static string Decrypt(string pToDecrypt, string sKey,byte[] iv)
        
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);
            //byte[] iv =  1, 2, 3, 4, 5, 6, 7, 8 ;
            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
            des.IV = iv;
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            // 如果两次密匙不一样,这一步可能会引发异常
            cs.FlushFinalBlock();

            return System.Text.Encoding.Default.GetString(ms.ToArray());
        

  Java加密解密算法

  public static String decryptDES(String decryptString, String decryptKey) throws Exception 
        String afterDecryptString = null;
        byte[] byteMi = new Base64().decode(decryptString);
        try 
            SecretKeySpec key = new SecretKeySpec(decryptKey.getBytes(), "DES");
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(2, key);
            byte[] decryptData = cipher.doFinal(byteMi);
            afterDecryptString = new String(decryptData, "UTF-8");
         catch (Exception e) 
            log.error("decryptDES error", e);
            throw e;
        
        return afterDecryptString;
    

  C#代码

  public static string Decrypt(string pToDecrypt, string sKey)
        
           
            //var inputByteArray = ASCIIEncoding.ASCII.GetBytes(pToDecrypt);
            byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);
           
            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider()) 
                //des.Padding =PaddingMode.PKCS7;
                des.Mode = CipherMode.ECB;
                des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
                des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
                
                    cs.Write(inputByteArray, 0, inputByteArray.Length);
                    cs.FlushFinalBlock();
                    cs.Close();
                
                string str = Encoding.UTF8.GetString(ms.ToArray());
                ms.Close();
                return str;
            
        

  

 

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