. Net (c #) encryption and decryption of Aes and Des,

. Net (c #) encryption and decryption of Aes and Des,
. Net (c #) encryption and decryption tool class:

/// <Summary> ///. net encryption and decryption help class // </summary> public class NetCryptoHelper {# region des implementation /// <summary> // Des default key vector /// </summary> public static byte [] DesIv = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; /// <summary> // The Des encryption key must be 8 bits // </summary> public const string encryption ey = "eyey8w "; /// <summary> /// obtain the Des8 bit key // </summary> /// <param name = "key"> Des key string </param> // /<returns> Des8 bit key </returns> static byte [] GetDesKey (string key) {if (string. isNullOrEmpty (key) {throw new ArgumentNullException ("key", "Des key cannot be blank");} if (key. length> 8) {key = key. substring (0, 8);} if (key. length <8) {// less than 8 fill key = key. padRight (8, '0');} return Encoding. UTF8.GetBytes (key );} /// <summary> // Des encryption // </summary> /// <param name = "source"> source string </param> /// <param name = "key"> des key, the length must be 8 bits </param> /// <param name = "iv"> key vector </param> /// <returns> the encrypted string </returns> public static string EncryptDes (string source, string key, byte [] iv) {using (DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider () {byte [] rgbKeys = getpolicey (key), rgbIvs = iv, inputByteArray = Encoding. UTF8.GetBytes (source); using (MemoryStream memoryStream = new MemoryStream () {using (CryptoStream cryptoStream = new CryptoStream (memoryStream, desProvider. createEncryptor (rgbKeys, rgbIvs), CryptoStreamMode. write) {cryptoStream. write (inputByteArray, 0, inputByteArray. length); cryptoStream. flushFinalBlock (); // 1. first return Convert. toBase64String (memoryStream. toArray (); // 2. // StringBuilder result = new StringBuilder (); // foreach (byte B in memoryStream. toArray () // {// result. appendFormat ("{0: X2}", B); //} // return result. toString ();}}}} /// <summary> // Des decryption // </summary> /// <param name = "source"> source string </param> /// <param name = "key"> des key, the length must be 8 bits </param> /// <param name = "iv"> key vector </param> /// <returns> the decrypted string </returns> public static string DecryptDes (string source, string key, byte [] iv) {using (DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider () {byte [] rgbKeys = getpolicey (key), rgbIvs = iv, inputByteArray = Convert. fromBase64String (source); using (MemoryStream memoryStream = new MemoryStream () {using (CryptoStream cryptoStream = new CryptoStream (memoryStream, desProvider. createDecryptor (rgbKeys, rgbIvs), CryptoStreamMode. write) {cryptoStream. write (inputByteArray, 0, inputByteArray. length); cryptoStream. flushFinalBlock (); return Encoding. UTF8.GetString (memoryStream. toArray ());}}}} # endregion # region aes implementation // <summary> // Aes encryption key must be 32 bits // </summary> public static string AesKey = "asekey32w "; /// <summary> /// obtain the Aes32-bit key // </summary> /// <param name = "key"> Aes key string </param> // /<returns> Aes32-bit key </returns> static byte [] GetAesKey (string key) {if (string. isNullOrEmpty (key) {throw new ArgumentNullException ("key", "Aes key cannot be blank");} if (key. length <32) {// less than 32 complete key = key. padRight (32, '0');} if (key. length> 32) {key = key. substring (0, 32);} return Encoding. UTF8.GetBytes (key );} /// <summary> // Aes encryption // </summary> /// <param name = "source"> source string </param> /// <param name = "key"> aes key, the length must be 32 characters </param> /// <returns> encrypted string </returns> public static string EncryptAes (string source, string key) {using (AesCryptoServiceProvider aesProvider = new AesCryptoServiceProvider () {aesProvider. key = GetAesKey (key); aesProvider. mode = CipherMode. ECB; aesProvider. padding = PaddingMode. PKCS7; using (ICryptoTransform cryptoTransform = aesProvider. createEncryptor () {byte [] inputBuffers = Encoding. UTF8.GetBytes (source); byte [] results = cryptoTransform. transformFinalBlock (inputBuffers, 0, inputBuffers. length); aesProvider. clear (); aesProvider. dispose (); return Convert. toBase64String (results, 0, results. length );}}} /// <summary> // Aes decryption // </summary> /// <param name = "source"> source string </param> /// <param name = "key"> aes key, the length must be 32 characters </param> /// <returns> decrypted string </returns> public static string DecryptAes (string source, string key) {using (AesCryptoServiceProvider aesProvider = new AesCryptoServiceProvider () {aesProvider. key = GetAesKey (key); aesProvider. mode = CipherMode. ECB; aesProvider. padding = PaddingMode. PKCS7; using (ICryptoTransform cryptoTransform = aesProvider. createDecryptor () {byte [] inputBuffers = Convert. fromBase64String (source); byte [] results = cryptoTransform. transformFinalBlock (inputBuffers, 0, inputBuffers. length); aesProvider. clear (); return Encoding. UTF8.GetString (results) ;}}# endregion}

Debug and run:

Class Program {static void Main (string [] args) {string plainText = "", encryptString = NetCryptoHelper. encryptDes (plainText, NetCryptoHelper. cipher ey, NetCryptoHelper. desIv); Console. writeLine ("des encrypted string: {0}", plainText); Console. writeLine ("des encrypted string: {0}", encryptString); Console. writeLine ("des decrypted string: {0}", NetCryptoHelper. decryptDes (encryptString, NetCryptoHelper. cipher ey, NetCryptoHelper. desIv); Console. writeLine ("----------- split line -----------"); Console. writeLine ("aes pre-encryption string: {0}", plainText); encryptString = NetCryptoHelper. encryptAes (plainText, NetCryptoHelper. aesKey); Console. writeLine ("aes encrypted string: {0}", encryptString); Console. writeLine ("aes decrypted string: {0}", NetCryptoHelper. decryptAes (encryptString, NetCryptoHelper. aesKey); Console. readKey ();}}