C#常用类
整理了一些常用的C#帮助类
2018/05/17更新
DES加密解密类
using System; using System.Collections.Generic; using System.Linq; using System.Security.Cryptography; using System.Text; using System.Threading.Tasks; namespace CoreAPI.Common { /// <summary> /// DES帮助类 /// </summary> public class DESHelper { /// <summary> /// 进行DES加密。 /// </summary> /// <param name="pToEncrypt">要加密的字符串。</param> /// <param name="sKey">密钥,且必须为8位。</param> /// <returns>以Base64格式返回的加密字符串。</returns> public static string Encrypt(string pToEncrypt, string sKey) { using (DESCryptoServiceProvider des = new DESCryptoServiceProvider()) { byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt); des.Key = Encoding.ASCII.GetBytes(sKey); des.IV = Encoding.ASCII.GetBytes(sKey); System.IO.MemoryStream ms = new System.IO.MemoryStream(); using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write)) { cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); cs.Close(); } string str = Convert.ToBase64String(ms.ToArray()); ms.Close(); return str; } } /// <summary> /// 进行DES解密。 /// </summary> /// <param name="pToDecrypt">要解密的以Base64</param> /// <param name="sKey">密钥,且必须为8位。</param> /// <returns>已解密的字符串。</returns> public static string Decrypt(string pToDecrypt, string sKey) { byte[] inputByteArray = Convert.FromBase64String(pToDecrypt); using (DESCryptoServiceProvider des = new DESCryptoServiceProvider()) { des.Key = Encoding.ASCII.GetBytes(sKey); des.IV = Encoding.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; } } } }