c# AES DES MD5加密演算法
阿新 • • 發佈：2018-12-13
MD5加密封裝
MD5常用加密FormsAuthentication.HashPasswordForStoringInConfigFile在Net Freamwork4.5以後就不在支援，下面整理了32位或16位下的幾個方法，以及不同寫法，最後一個由從老版本遷移過來，後續淘汰不用。
using System; using System.Collections.Generic; using System.Security.Cryptography; using System.Text; namespace NC.Common { /// <summary> /// 此類獲取md5加密值均為大寫，如果要獲取小寫：MD5Comm.Get32MD5One(xx).ToLower();或完善此類。 /// </summary> public class MD5Comm { #region --Expired code-- ///// <summary> ///// MD5加密 ///// </summary> //public string Md5(string txt) //{ // //return FormsAuthentication.HashPasswordForStoringInConfigFile(txt, "MD5");//此方法nf4.5後不再支援 //} //public string Md5Pass(string pwd) //{ // return Md5(pwd + "Jiahao"); //} #endregion /// <summary> /// 此程式碼示例通過建立雜湊字串適用於任何 MD5 雜湊函式 （在任何平臺） 上建立 32 個字元的十六進位制格式雜湊字串 /// 官網案例改編 /// </summary> /// <param name="source"></param> /// <returns></returns> public static string Get32MD5One(string source) { using (MD5 md5Hash = MD5.Create()) { byte[] data = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(source)); StringBuilder sBuilder = new StringBuilder(); for (int i = 0; i < data.Length; i++) { sBuilder.Append(data[i].ToString("x2")); } string hash = sBuilder.ToString(); return hash.ToUpper(); } } /// <summary> /// 獲取16位md5加密 /// </summary> /// <param name="source"></param> /// <returns></returns> public static string Get16MD5One(string source) { using (MD5 md5Hash = MD5.Create()) { byte[] data = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(source)); //轉換成字串，並取9到25位 string sBuilder = BitConverter.ToString(data, 4, 8); //BitConverter轉換出來的字串會在每個字元中間產生一個分隔符，需要去除掉 sBuilder = sBuilder.Replace("-", ""); return sBuilder.ToString().ToUpper(); } } //// <summary> /// </summary> /// <param name="strSource">需要加密的明文</param> /// <returns>返回32位加密結果，該結果取32位加密結果的第9位到25位</returns> public static string Get32MD5Two(string source) { System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider(); //獲取密文位元組陣列 byte[] bytResult = md5.ComputeHash(System.Text.Encoding.Default.GetBytes(source)); //轉換成字串，32位 string strResult = BitConverter.ToString(bytResult); //BitConverter轉換出來的字串會在每個字元中間產生一個分隔符，需要去除掉 strResult = strResult.Replace("-", ""); return strResult.ToUpper(); } //// <summary> /// </summary> /// <param name="strSource">需要加密的明文</param> /// <returns>返回16位加密結果，該結果取32位加密結果的第9位到25位</returns> public static string Get16MD5Two(string source) { System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider(); //獲取密文位元組陣列 byte[] bytResult = md5.ComputeHash(System.Text.Encoding.Default.GetBytes(source)); //轉換成字串，並取9到25位 string strResult = BitConverter.ToString(bytResult, 4, 8); //BitConverter轉換出來的字串會在每個字元中間產生一個分隔符，需要去除掉 strResult = strResult.Replace("-", ""); return strResult.ToUpper(); } /// <summary> /// 自定義MD5函式,32位,從老版本遷移過來，後續淘汰不用。與Get32MD5One重複 /// </summary> public static string Get32MD5Old(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.ToUpper(); } } }
AES的加密、解密
上面我們介紹了MD5加密封裝，接下來分享給大家供大家參考一下AES加密、解密，AES要注意的是32位密匙。AES 加密解密(高階加密標準，是下一代的加密演算法標準，速度快，安全級別高，目前 AES 標準的一個實現是 Rijndael 演算法)
using System; using System.IO; using System.Text; using System.Security.Cryptography; namespace NC.Common { /// <summary> /// 加密 /// </summary> public class AES { //預設金鑰向量 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 = GetSubString(encryptKey,0, 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 = GetSubString(decryptKey,0, 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 ""; } } public static string GetSubString(string p_SrcString, int p_StartIndex, int p_Length, string p_TailString) { string myResult = p_SrcString; Byte[] bComments = Encoding.UTF8.GetBytes(p_SrcString); foreach (char c in Encoding.UTF8.GetChars(bComments)) { //當是日文或韓文時(注:中文的範圍:\u4e00 - \u9fa5, 日文在\u0800 - \u4e00, 韓文為\xAC00-\xD7A3) if ((c > '\u0800' && c < '\u4e00') || (c > '\xAC00' && c < '\xD7A3')) { //if (System.Text.RegularExpressions.Regex.IsMatch(p_SrcString, "[\u0800-\u4e00]+") || System.Text.RegularExpressions.Regex.IsMatch(p_SrcString, "[\xAC00-\xD7A3]+")) //當擷取的起始位置超出欄位串長度時 if (p_StartIndex >= p_SrcString.Length) return ""; else return p_SrcString.Substring(p_StartIndex, ((p_Length + p_StartIndex) > p_SrcString.Length) ? (p_SrcString.Length - p_StartIndex) : p_Length); } } if (p_Length >= 0) { byte[] bsSrcString = Encoding.Default.GetBytes(p_SrcString); //當字串長度大於起始位置 if (bsSrcString.Length > p_StartIndex) { int p_EndIndex = bsSrcString.Length; //當要擷取的長度在字串的有效長度範圍內 if (bsSrcString.Length > (p_StartIndex + p_Length)) { p_EndIndex = p_Length + p_StartIndex; } else { //當不在有效範圍內時,只取到字串的結尾 p_Length = bsSrcString.Length - p_StartIndex; p_TailString = ""; } int nRealLength = p_Length; int[] anResultFlag = new int[p_Length]; byte[] bsResult = null; int nFlag = 0; for (int i = p_StartIndex; i < p_EndIndex; i++) { if (bsSrcString[i] > 127) { nFlag++; if (nFlag == 3) nFlag = 1; } else nFlag = 0; anResultFlag[i] = nFlag; } if ((bsSrcString[p_EndIndex - 1] > 127) && (anResultFlag[p_Length - 1] == 1)) nRealLength = p_Length + 1; bsResult = new byte[nRealLength]; Array.Copy(bsSrcString, p_StartIndex, bsResult, 0, nRealLength); myResult = Encoding.Default.GetString(bsResult); myResult = myResult + p_TailString; } } return myResult; } } }
DES加密/解密
除了MD5加密、AES加密/解密之外還經常用到DES加密、解密，注意的是DES的密匙是8位的，這裡有家婆MD5加密一起使用。
using System; using System.Security.Cryptography; using System.Text; namespace NC.Common { /// <summary> /// DES加密/解密類。 /// </summary> public class DESEncrypt { #region --加密-- /// <summary> /// 加密 /// </summary> /// <param name="Text"></param> /// <returns></returns> public static string Encrypt(string Text) { return Encrypt(Text, "ncmvc"); } /// <summary> /// 加密資料 /// </summary> /// <param name="Text"></param> /// <param name="sKey"></param> /// <returns></returns> public static string Encrypt(string Text, string sKey) { try { DESCryptoServiceProvider des = new DESCryptoServiceProvider(); byte[] inputByteArray; inputByteArray = Encoding.Default.GetBytes(Text); string md5SKey = MD5Comm.Get32MD5One(sKey).Substring(0, 8); des.Key = ASCIIEncoding.ASCII.GetBytes(md5SKey); des.IV = ASCIIEncoding.ASCII.GetBytes(md5SKey); System.IO.MemoryStream ms = new System.IO.MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); StringBuilder ret = new StringBuilder(); foreach (byte b in ms.ToArray()) { ret.AppendFormat("{0:X2}", b); } return ret.ToString(); } catch { return "error"; } } #endregion #region --解密-- /// <summary> /// 解密 /// </summary> /// <param name="Text"></param> /// <returns></returns> public static string Decrypt(string Text) { return Decrypt(Text, "ncmvc"); } /// <summary> /// 解密資料 /// </summary> /// <param name="Text"></param> /// <param name="sKey"></param> /// <returns></returns> public static string Decrypt(string Text, string sKey) { try { DESCryptoServiceProvider des = new DESCryptoServiceProvider(); int len; len = Text.Length / 2; byte[] inputByteArray = new byte[len]; int x, i; for (x = 0; x < len; x++) { i = Convert.ToInt32(Text.Substring(x * 2, 2), 16); inputByteArray[x] = (byte)i; } string md5SKey = MD5Comm.Get32MD5One(sKey).Substring(0, 8); des.Key = ASCIIEncoding.ASCII.GetBytes(md5SKey); des.IV = ASCIIEncoding.ASCII.GetBytes(md5SKey); System.IO.MemoryStream ms = new System.IO.MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); return Encoding.Default.GetString(ms.ToArray()); } catch { return "error"; } } #endregion } }