how to encryption and decryption value

Question

sir sir i am trying to encryption and decryption value

Ankur Jain · Answer

Hi! First use namespace using FangHome_Crypto; For Encrypt... public string EncryptDES(string Source, string Key) { SymmCrypto crypto = new SymmCrypto(SymmCrypto.SymmProvEnum.DES); return crypto.Encrypting(Source, Key); } pass value in parameter source which you want to encrypt and define key value which is used for encryption and decryption both. For Decrypt. public string DecryptDES(string Source, string Key) { SymmCrypto crypto = new SymmCrypto(SymmCrypto.SymmProvEnum.DES); return crypto.Decrypting(Source, Key); } Add Class file in your project and paste Follwing code.. using System; using System.Security.Cryptography; using System.IO; using System.Text; namespace FangHome_Crypto { /// /// SymmCrypto is a wrapper of System.Security.Cryptography.SymmetricAlgorithm classes /// and simplifies the interface. It supports customized SymmetricAlgorithm as well. /// public class SymmCrypto { /// /// Supported .Net intrinsic SymmetricAlgorithm classes. /// public enum SymmProvEnum : int { DES, RC2, Rijndael } private SymmetricAlgorithm mobjCryptoService; /// /// Constructor for using an intrinsic .Net SymmetricAlgorithm class. /// public SymmCrypto(SymmProvEnum NetSelected) { switch (NetSelected) { case SymmProvEnum.DES: mobjCryptoService = new DESCryptoServiceProvider(); break; case SymmProvEnum.RC2: mobjCryptoService = new RC2CryptoServiceProvider(); break; case SymmProvEnum.Rijndael: mobjCryptoService = new RijndaelManaged(); break; } } /// /// Constructor for using a customized SymmetricAlgorithm class. /// public SymmCrypto(SymmetricAlgorithm ServiceProvider) { mobjCryptoService = ServiceProvider; } /// /// Depending on the legal key size limitations of a specific CryptoService provider /// and length of the private key provided, padding the secret key with space character /// to meet the legal size of the algorithm. /// private byte[] GetLegalKey(string Key) { string sTemp; if (mobjCryptoService.LegalKeySizes.Length > 0) { int lessSize = 0, moreSize = mobjCryptoService.LegalKeySizes[0].MinSize; // key sizes are in bits while (Key.Length * 8 > moreSize) { lessSize = moreSize; moreSize += mobjCryptoService.LegalKeySizes[0].SkipSize; } sTemp = Key.PadRight(moreSize / 8, ' '); } else sTemp = Key; // convert the secret key to byte array return ASCIIEncoding.ASCII.GetBytes(sTemp); } public string Encrypting(string Source, string Key) { int icvbn = Source.Length; byte[] bytIn = System.Text.ASCIIEncoding.ASCII.GetBytes(Source); // create a MemoryStream so that the process can be done without I/O files System.IO.MemoryStream ms = new System.IO.MemoryStream(); byte[] bytKey = GetLegalKey(Key); // set the private key mobjCryptoService.Key = bytKey; mobjCryptoService.IV = bytKey; // create an Encryptor from the Provider Service instance ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor(); // create Crypto Stream that transforms a stream using the encryption CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write); // write out encrypted content into MemoryStream cs.Write(bytIn, 0, bytIn.Length); cs.FlushFinalBlock(); // get the output and trim the '\0' bytes //byte[] bytOut = ms.GetBuffer(); //int i = 0; //for (i = 0; i // if (bytOut[i] == 0) // break; byte[] bytOut = ms.ToArray(); // convert into Base64 so that the result can be used in xml return System.Convert.ToBase64String(bytOut); } public string Decrypting(string Source, string Key) { // convert from Base64 to binary byte[] bytIn = System.Convert.FromBase64String(Source); // create a MemoryStream with the input System.IO.MemoryStream ms = new System.IO.MemoryStream(bytIn, 0, bytIn.Length); byte[] bytKey = GetLegalKey(Key); // set the private key mobjCryptoService.Key = bytKey; mobjCryptoService.IV = bytKey; // create a Decryptor from the Provider Service instance ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor(); // create Crypto Stream that transforms a stream using the decryption CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read); // read out the result from the Crypto Stream System.IO.StreamReader sr = new System.IO.StreamReader(cs); return sr.ReadToEnd(); } } }

Ananth G · Answer

Encryption Sometimes we want to encrypt the values that time we use MD5 Encryption and Decryption Here i give the code for Encryption and Decryption. passPhrase ,saltValue ,initVector this variables are the key for Encryption and Decryption public static string passPhrase = "YOUR KEY1"; public static string saltValue = "YOUR KE2"; public static string initVector = "YOUR KE3"; public static string FunForEncrypt(string objText) { int keySize = 256; int passwordIterations = 03; string hashAlgorithm = "MD5"; byte[] initVectorBytes = Encoding.ASCII.GetBytes(initVector); byte[] saltValueBytes = Encoding.ASCII.GetBytes(saltValue); byte[] plainTextBytes = Encoding.UTF8.GetBytes(objText); PasswordDeriveBytes password = new PasswordDeriveBytes ( passPhrase, saltValueBytes, hashAlgorithm, passwordIterations ); byte[] keyBytes = password.GetBytes(keySize / 8); RijndaelManaged symmetricKey = new RijndaelManaged(); symmetricKey.Mode = CipherMode.CBC; ICryptoTransform encryptor = symmetricKey.CreateEncryptor ( keyBytes, initVectorBytes ); MemoryStream memoryStream = new MemoryStream(); CryptoStream cryptoStream = new CryptoStream ( memoryStream, encryptor, CryptoStreamMode.Write ); cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length); cryptoStream.FlushFinalBlock(); byte[] cipherTextBytes = memoryStream.ToArray(); memoryStream.Close(); cryptoStream.Close(); string cipherText = Convert.ToBase64String(cipherTextBytes); cipherText = HttpUtility.UrlEncode(cipherText); return cipherText; } Decryption : this below code used to Decrypt the text public static string FunForDecrypt(string cipherText) { string plainText = ""; int keySize = 256; int passwordIterations = 03; string hashAlgorithm = "MD5"; try { cipherText = HttpUtility.UrlDecode(cipherText); byte[] initVectorBytes = Encoding.ASCII.GetBytes(initVector); byte[] saltValueBytes = Encoding.ASCII.GetBytes(saltValue); byte[] cipherTextBytes = Convert.FromBase64String(cipherText); PasswordDeriveBytes password = new PasswordDeriveBytes ( passPhrase, saltValueBytes, hashAlgorithm, passwordIterations ); byte[] keyBytes = password.GetBytes(keySize / 8); RijndaelManaged symmetricKey = new RijndaelManaged(); symmetricKey.Mode = CipherMode.CBC; ICryptoTransform decryptor = symmetricKey.CreateDecryptor ( keyBytes, initVectorBytes ); MemoryStream memoryStream = new MemoryStream(cipherTextBytes); CryptoStream cryptoStream = new CryptoStream ( memoryStream, decryptor, CryptoStreamMode.Read ); byte[] plainTextBytes = new byte[cipherTextBytes.Length]; int decryptedByteCount = cryptoStream.Read ( plainTextBytes, 0, plainTextBytes.Length ); memoryStream.Close(); cryptoStream.Close(); plainText = Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount); } catch (Exception ex) { plainText = ""; } return plainText; }

Farhan Shariff · Answer

Simple encrypting and decrypting data in C# http://www.codeproject.com/Articles/5719/Simple-encrypting-and-decrypting-data-in-C