C#加密解密

//加密解密 public class GF_Encrypt { /// <summary> /// DES加密 /// </summary> /// <param name="pToEncrypt">加密字符串</param> /// <param name="sKey">密钥</param> /// <returns></returns> public static string string_Encrypt(string pToEncrypt, string sKey) { if (pToEncrypt == "") return ""; if (sKey.Length < 8) sKey = sKey + "xuE29xWp"; if (sKey.Length > 8) sKey = sKey.Substring(0, 8); 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); //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.Default.GetBytes(sKey); des.IV = ASCIIEncoding.Default.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(); } /// <summary> /// DES解密 /// </summary> /// <param name="pToDecrypt">解密字符串</param> /// <param name="sKey">解密密钥</param> /// <param name="outstr">返回值</param> /// <returns></returns> public static bool string_Decrypt(string pToDecrypt, string sKey, out string outstr) { if (pToDecrypt == "") { outstr = ""; return true; }; if (sKey.Length < 8) sKey = sKey + "xuE29xWp"; if (sKey.Length > 8) sKey = sKey.Substring(0, 8); try { 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; } //建立加密对象的密钥和偏移量，此值重要，不能修改 des.Key = ASCIIEncoding.Default.GetBytes(sKey); des.IV = ASCIIEncoding.Default.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(); outstr = System.Text.Encoding.Default.GetString(ms.ToArray()); return true; } catch { outstr = ""; return false; } } /// <summary> /// 加密 /// </summary> public class AES { //默认密钥向量 private static byte[] Keys = { 0x41, 0x72, 0x65, 0x79, 0x6F, 0x75, 0x6D, 0x79, 0x53, 0x6E, 0x6F, 0x77, 0x6D, 0x61, 0x6E, 0x3F }; public static string Encode(string encryptString, string encryptKey) { encryptKey = GF_GET.GetSubString(encryptKey, 32, ""); encryptKey = encryptKey.PadRight(32, ' '); RijndaelManaged rijndaelProvider = new RijndaelManaged(); rijndaelProvider.Key = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 32)); rijndaelProvider.IV = Keys; ICryptoTransform rijndaelEncrypt = rijndaelProvider.CreateEncryptor(); byte[] inputData = Encoding.UTF8.GetBytes(encryptString); byte[] encryptedData = rijndaelEncrypt.TransformFinalBlock(inputData, 0, inputData.Length); return Convert.ToBase64String(encryptedData); } public static string Decode(string decryptString, string decryptKey) { try { decryptKey = GF_GET.GetSubString(decryptKey, 32, ""); decryptKey = decryptKey.PadRight(32, ' '); RijndaelManaged rijndaelProvider = new RijndaelManaged(); rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey); rijndaelProvider.IV = Keys; ICryptoTransform rijndaelDecrypt = rijndaelProvider.CreateDecryptor(); byte[] inputData = Convert.FromBase64String(decryptString); byte[] decryptedData = rijndaelDecrypt.TransformFinalBlock(inputData, 0, inputData.Length); return Encoding.UTF8.GetString(decryptedData); } catch { return ""; } } } /// <summary> /// 加密 /// </summary> public class DES { //默认密钥向量 private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; /// <summary> /// DES加密字符串 /// </summary> /// <param name="encryptString">待加密的字符串</param> /// <param name="encryptKey">加密密钥,要求为8位</param> /// <returns>加密成功返回加密后的字符串,失败返回源串</returns> public static string Encode(string encryptString, string encryptKey) { encryptKey = GF_GET.GetSubString(encryptKey, 8, ""); encryptKey = encryptKey.PadRight(8, ' '); byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8)); byte[] rgbIV = Keys; byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString); DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider(); MemoryStream mStream = new MemoryStream(); CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write); cStream.Write(inputByteArray, 0, inputByteArray.Length); cStream.FlushFinalBlock(); return Convert.ToBase64String(mStream.ToArray()); } /// <summary> /// DES解密字符串 /// </summary> /// <param name="decryptString">待解密的字符串</param> /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param> /// <returns>解密成功返回解密后的字符串,失败返源串</returns> public static string Decode(string decryptString, string decryptKey) { try { decryptKey = GF_GET.GetSubString(decryptKey, 8, ""); decryptKey = decryptKey.PadRight(8, ' '); byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey); byte[] rgbIV = Keys; byte[] inputByteArray = Convert.FromBase64String(decryptString); DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider(); MemoryStream mStream = new MemoryStream(); CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write); cStream.Write(inputByteArray, 0, inputByteArray.Length); cStream.FlushFinalBlock(); return Encoding.UTF8.GetString(mStream.ToArray()); } catch { return ""; } } } /// <summary> /// MD5函数 /// </summary> /// <param name="str">原始字符串</param> /// <returns>MD5结果</returns> public static string MD5(string str) { byte[] b = Encoding.UTF8.GetBytes(str); b = new MD5CryptoServiceProvider().ComputeHash(b); string ret = ""; for (int i = 0; i < b.Length; i++) ret += b[i].ToString("x").PadLeft(2, '0'); return ret; } /// <summary> /// SHA256函数 /// </summary> /// /// <param name="str">原始字符串</param> /// <returns>SHA256结果</returns> public static string SHA256(string str) { byte[] SHA256Data = Encoding.UTF8.GetBytes(str); SHA256Managed Sha256 = new SHA256Managed(); byte[] Result = Sha256.ComputeHash(SHA256Data); return Convert.ToBase64String(Result); //返回长度为44字节的字符串 } }