using System; using System.Security; using System.Security.Cryptography; using System.IO; using System.Text; using System.Threading; namespace TRIP3DES { /// <summary> /// Class1 的摘要说明。 /// </summary> public class dllEncrypt { //密钥 private const string sKey = "qJzGEh6hESZDVJeCnFPGuxzaiB7NLQM3"; //矢量，矢量可以为空 private const string sIV = "qcDY6X+aPLw="; //构造一个对称算法 private SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider(); public dllEncrypt(){} #region public string EncryptString(string Value) /// <summary> /// 加密字符串 /// </summary> /// <param name="Value">输入的字符串</param> /// <returns>加密后的字符串</returns> public string EncryptString(string Value) { ICryptoTransform ct; MemoryStream ms; CryptoStream cs; byte[] byt; mCSP.Key = Convert.FromBase64String(sKey); mCSP.IV = Convert.FromBase64String(sIV); //指定加密的运算模式 mCSP.Mode = System.Security.Cryptography.CipherMode.ECB; //获取或设置加密算法的填充模式 mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7; ct = mCSP.CreateEncryptor(mCSP.Key, mCSP.IV); byt = Encoding.UTF8.GetBytes(Value); ms = new MemoryStream(); cs = new CryptoStream(ms, ct, CryptoStreamMode.Write); cs.Write(byt, 0, byt.Length); cs.FlushFinalBlock(); cs.Close(); return Convert.ToBase64String(ms.ToArray()); } #endregion #region public string DecryptString(string Value) /// <summary> /// 解密字符串 /// </summary> /// <param name="Value">加过密的字符串</param> /// <returns>解密后的字符串</returns> public string DecryptString(string Value) { ICryptoTransform ct; MemoryStream ms; CryptoStream cs; byte[] byt; mCSP.Key = Convert.FromBase64String(sKey); mCSP.IV = Convert.FromBase64String(sIV); mCSP.Mode = System.Security.Cryptography.CipherMode.ECB; mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7; ct = mCSP.CreateDecryptor(mCSP.Key, mCSP.IV); byt = Convert.FromBase64String(Value); ms = new MemoryStream(); cs = new CryptoStream(ms, ct, CryptoStreamMode.Write); cs.Write(byt, 0, byt.Length); cs.FlushFinalBlock(); cs.Close(); return Encoding.UTF8.GetString(ms.ToArray()); } #endregion } }