3DES加解密类
using System; using System.IO; using System.Security.Cryptography; using System.Text; namespace GT.Common.DES { /// <summary> /// 3DES加解密类 /// </summary> public class DESHelper { //构造一个对称算法 private SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider(); #region 加密解密函数 /// <summary> /// 字符串的加密 /// </summary> /// <param name="Value">要加密的字符串</param> /// <param name="sKey">密钥,必须32位</param> /// <param name="sIV">向量,必须是8个字符</param> /// <returns>加密后的字符串</returns> public string EncryptString(string Value, string sKey,string sIV) { try { if (string.IsNullOrWhiteSpace(sKey)) { sKey = key; } if (string.IsNullOrWhiteSpace(sIV)) { sIV = iv; } ICryptoTransform ct; MemoryStream ms; CryptoStream cs; byte[] byt; mCSP.Key = Convert.FromBase64String(sKey); byte[] biv=Encoding.Default.GetBytes (sIV); mCSP.IV = biv; //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);//创建加密对象 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()); } catch (Exception ex) { return ("Error in Encrypting " + ex.Message); } } /// <summary> /// 解密字符串 /// </summary> /// <param name="Value">加密后的字符串</param> /// <param name="sKey">密钥,必须32位</param> /// <param name="sIV">向量,必须是12个字符</param> /// <returns>解密后的字符串</returns> public string DecryptString(string Value, string sKey, string sIV) { try { if (string.IsNullOrWhiteSpace(sKey)) { sKey = key; } if (string.IsNullOrWhiteSpace(sIV)) { sIV = iv; } ICryptoTransform ct;//加密转换运算 MemoryStream ms;//内存流 CryptoStream cs;//数据流连接到数据加密转换的流 byte[] byt; //将3DES的密钥转换成byte mCSP.Key = Convert.FromBase64String(sKey); //将3DES的向量转换成byte mCSP.IV = Encoding.Default.GetBytes(sIV); mCSP.Mode = System.Security.Cryptography.CipherMode.ECB; mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7; ct = mCSP.CreateDecryptor(mCSP.Key, mCSP.IV);//创建对称解密对象 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()); } catch (Exception ex) { return ("Error in Decrypting " + ex.Message); } } #endregion #region KEY //<!--不要轻易修改,一定要保证跟生产环境的一致,防止丢失--> //<!--秘钥32位--> public static readonly string key = "aybcwdefgh1ntv2x3qr4u5o6igklszmp"; //<!--向量8位--> public static readonly string iv = "85632147"; #endregion } }