C# DES加密
需要引用名称空间
1 using System; 2 using System.Text; 3 using System.Security.Cryptography; 4 using System.IO;
具体代码：
1 public class CryptoHelper 2 { 3 /// <summary> 4 /// 使用DES加密 5 /// </summary> 6 /// <param name="plain">明文</param> 7 /// <param name="key">加密钥匙</param> 8 /// <param name="iv">向量</param> 9 /// <returns>返回密文</returns> 10 public static string DesEncode(string plain, string key, string iv) 11 { 12 //把密钥转换成字节数组 13 byte[] keyBytes = Encoding.ASCII.GetBytes(key); 14 15 //把向量转换成字节数组 16 byte[] ivBytes = Encoding.ASCII.GetBytes(iv); 17 18 //声明1个新的DES对象 19 DESCryptoServiceProvider des = new DESCryptoServiceProvider(); 20 21 //开辟一块内存流 22 MemoryStream msEncrypt = new MemoryStream(); 23 24 //把内存流对象包装成加密流对象 25 CryptoStream csEncrypt = new CryptoStream(msEncrypt, des.CreateEncryptor(keyBytes, ivBytes), CryptoStreamMode.Write); 26 27 //把加密流对象包装成写入流对象 28 StreamWriter swEncrypt = new StreamWriter(csEncrypt); 29 30 //写入流对象写入明文 31 swEncrypt.WriteLine(plain); 32 33 //写入流关闭 34 swEncrypt.Close(); 35 36 //加密流关闭 37 csEncrypt.Close(); 38 39 //把内存流转换成字节数组，内存流现在已经是密文了 40 byte[] bytesCipher=msEncrypt.ToArray(); 41 42 //内存流关闭 43 msEncrypt.Close(); 44 //将字节数组转化成Base64字符串 45 return Convert.ToBase64String(bytesCipher); 46 } 47 48 public static string DesDeCode(string cipher, string key, string iv) 49 { 50 //将密文通过Base64位还原成字节数组 51 byte[] cipherByte = Convert.FromBase64String(cipher); 52 53 //把密钥转换成字节数组 54 byte[] keyBytes = Encoding.ASCII.GetBytes(key); 55 56 //把向量转换成字节数组 57 byte[] ivBytes = Encoding.ASCII.GetBytes(iv); 58 59 //声明1个新的DES对象 60 DESCryptoServiceProvider des = new DESCryptoServiceProvider(); 61 62 //开辟一块内存流，并存放密文字节数组 63 MemoryStream msDecrypt = new MemoryStream(cipherByte); 64 65 //把内存流对象包装成解密流对象 66 CryptoStream csDecrypt = new CryptoStream(msDecrypt, des.CreateDecryptor(keyBytes, ivBytes), CryptoStreamMode.Read); 67 68 //把解密流对象包装成写入流对象 69 StreamReader srDecrypt = new StreamReader(csDecrypt); 70 71 //明文=读出流的读出内容 72 string strPlainText=srDecrypt.ReadLine(); 73 74 //读出流关闭 75 srDecrypt.Close(); 76 77 //解密流关闭 78 csDecrypt.Close(); 79 80 //内存流关闭 81 msDecrypt.Close(); 82 83 //返回明文 84 return strPlainText; 85 } 86 }
