20200612

wxr

2020-06-15 b8e94316e41eba72d927d5ca7d931b26139ee8ff

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using System; 
using System.Text; 
using System.Security.Cryptography; 
using System.IO; 
 
namespace Shared.Encryption 
{ 
    public  class DES 
    { 
        //<summary><![CDATA[字符串DES加密函数]]></summary> 
        //<param name="str"><![CDATA[被加密字符串 ]]></param> 
        //<param name="key"><![CDATA[密钥 ]]></param>  
        //<returns><![CDATA[加密后字符串，error开头表示错误]]></returns>    
        public static string Encode(string str, string key)
        {
            try
            {
                var provider = new DESCryptoServiceProvider();
                provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, key.Length < 8 ? key.Length : 8));
                provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, key.Length < 8 ? key.Length : 8));
                var bytes = Encoding.UTF8.GetBytes(str); 
                using (var stream = new MemoryStream())
                {
                    var stream2 = new CryptoStream(stream, provider.CreateEncryptor(), CryptoStreamMode.Write);
                    stream2.Write(bytes, 0, bytes.Length);
                    stream2.FlushFinalBlock();
                    var builder = new StringBuilder();
                    foreach (byte num in stream.ToArray())
                    {
                        builder.AppendFormat("{0:X2}", num);
                    }
                    return builder.ToString(); 
                }
            }
            catch (Exception)
            {
                return "error:加密失败!";
            }
        } 
 
        //<summary><![CDATA[字符串DES解密函数]]></summary> 
        //<param name="str"><![CDATA[被解密字符串 ]]></param> 
        //<param name="key"><![CDATA[密钥 ]]></param>  
        //<returns><![CDATA[解密后字符串,error开头是出错]]></returns>    
        public static string Decode(string str, string key) 
        { 
            try 
            { 
                var provider = new DESCryptoServiceProvider(); 
                // 密钥 
                provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, key.Length < 8 ? key.Length : 8)); 
                // 偏移量 
                provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, key.Length < 8 ? key.Length : 8)); 
                var buffer = new byte[str.Length / 2]; 
                for (int i = 0; i < (str.Length / 2); i++) 
                { 
                    int num2 = Convert.ToInt32(str.Substring(i * 2, 2), 0x10); 
                    buffer[i] = (byte)num2; 
                } 
                using (var stream = new MemoryStream())
                {
                    var stream2 = new CryptoStream(stream, provider.CreateDecryptor(), CryptoStreamMode.Write);
                    stream2.Write(buffer, 0, buffer.Length);
                    stream2.FlushFinalBlock();
                    stream.Close();
                    return Encoding.UTF8.GetString(stream.ToArray());
                } 
            } 
            catch (Exception) 
            {  
                return "error:解密失败!";  
            } 
        } 
    } 
}