C# DES加密解密的实现,DES算法为密码体制中的对称密码体制,由IBM公司研制的对称密码体制加密算法。其核心为密钥长度为56位,明文按64位进行分组,将分组后的明文组和56位的密钥按位替代或交换的方法形成密文组的加密方法。
C# DES加密解密的实现实例:
C# DES加密解密之名称空间 :
- using System;
- using System.Security.Cryptography;
- using System.IO;
- using System.Text;
C# DES加密解密之方法 :
- //加密方法
- publicstring Encrypt(string pToEncrypt, string sKey)
- {
- DESCryptoServiceProvider des = new DESCryptoServiceProvider();
- //把字符串放到byte数组中
- //原来使用的UTF8编码,我改成Unicode编码了,不行
- byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
- //byte[] inputByteArray=Encoding.Unicode.GetBytes(pToEncrypt);
C# DES加密解密之建立加密对象的密钥和偏移量
- //原文使用ASCIIEncoding.ASCII方法的GetBytes方法
- //使得输入密码必须输入英文文本
- des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
- des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
- MemoryStream ms = new MemoryStream();
- CryptoStream cs = new CryptoStream(
- ms, des.CreateEncryptor(),CryptoStreamMode.Write);
- //Write the byte array into the crypto stream
- //(It will end up in the memory stream)
- cs.Write(inputByteArray, 0, inputByteArray.Length);
- cs.FlushFinalBlock();
- //Get the data back from the memory stream, and into a string
- StringBuilder ret = new StringBuilder();
- foreach(byte b in ms.ToArray())
- {
- //Format as hex
- ret.AppendFormat("{0:X2}", b);
- }
- ret.ToString();
- return ret.ToString();
- }
C# DES加密解密之解密方法
- publicstring Decrypt(string pToDecrypt, string sKey)
- {
- DESCryptoServiceProvider des = new DESCryptoServiceProvider();
- //Put the input string into the byte array
- byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
- for(int x = 0; x < pToDecrypt.Length / 2; x++)
- {
- int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
- inputByteArray[x] = (byte)i;
- }
C# DES加密解密之建立加密对象的密钥和偏移量,此值重要,不能修改
- des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
- des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
- MemoryStream ms = new MemoryStream();
- CryptoStream cs = new CryptoStream(ms,
- des.CreateDecryptor(),CryptoStreamMode.Write);
- //Flush the data through the crypto stream into the memory stream
- cs.Write(inputByteArray, 0, inputByteArray.Length);
- cs.FlushFinalBlock();
- //Get the decrypted data back from the memory stream
- //建立StringBuild对象,
- //CreateDecrypt使用的是流对象,必须把解密后的文本变成流对象
- StringBuilder ret = new StringBuilder();
- return System.Text.Encoding.Default.GetString(ms.ToArray());
- }
C# DES加密解密的实例解析就向你介绍到这里,希望你对C# DES加密解密有所了解,对你应用C# DES加密解密有所帮助。
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