Encryption and decryption

Question

Dear All I am working with WCF rest Services that are created for mobile app in anroid I want that when app team send me the password in encrypted mode then how i decrypted it in wcf method  Is there any common way to encrypted password using anroid and then i decrypted it in wcf service method. Please provide me a way to achieve this Thanks

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; }

Bikesh Srivastava · Answer

Use this code its working fine.. privatestringEncrypt(stringclearText) { stringEncryptionKey= MAKV2SPBNI99212 ; byte []clearBytes=Encoding.Unicode.GetBytes(clearText); using (Aesencryptor=Aes.Create()) { Rfc2898DeriveBytespdb=newRfc2898DeriveBytes(EncryptionKeynewbyte[]{0x490x760x610x6e0x200x4d0x650x640x760x650x640x650x76}); encryptor.Key=pdb.GetBytes(32); encryptor.IV=pdb.GetBytes(16); using (MemoryStreamms=newMemoryStream()) { using (CryptoStreamcs=newCryptoStream(msencryptor.CreateEncryptor()CryptoStreamMode.Write)) { cs.Write(clearBytes0clearBytes.Length); cs.Close(); } clearText=Convert.ToBase64String(ms.ToArray()); } } returnclearText; } privatestringDecrypt(stringcipherText) { stringEncryptionKey= MAKV2SPBNI99212 ; byte []cipherBytes=Convert.FromBase64String(cipherText); using (Aesencryptor=Aes.Create()) { Rfc2898DeriveBytespdb=newRfc2898DeriveBytes(EncryptionKeynewbyte[]{0x490x760x610x6e0x200x4d0x650x640x760x650x640x650x76}); encryptor.Key=pdb.GetBytes(32); encryptor.IV=pdb.GetBytes(16); using (MemoryStreamms=newMemoryStream()) { using (CryptoStreamcs=newCryptoStream(msencryptor.CreateDecryptor()CryptoStreamMode.Write)) { cs.Write(cipherBytes0cipherBytes.Length); cs.Close(); } cipherText=Encoding.Unicode.GetString(ms.ToArray()); } } returncipherText; }

K P Singh Chundawat · Answer

Yes . You can . The best way is using your secret key you can do encryption and decryption.Copy and Paste below code into you application try to run it. // This constant string is used as a salt value for the PasswordDeriveBytes function calls. // This size of the IV (in bytes) must = (keysize / 8). Default keysize is 256 so the IV must be // 32 bytes long. Using a 16 character string here gives us 32 bytes when converted to a byte array. private static readonly byte [] initVectorBytes = Encoding.ASCII.GetBytes( tu89geji340t89u2 ); // This constant is used to determine the keysize of the encryption algorithm. private const int keysize = 256; //Here passPhrase is your secret key. Which can be anything. but should be similar in both ecryption and decryption public static string Encrypt( string plainText string passPhrase) { try { byte [] plainTextBytes = Encoding.UTF8.GetBytes(plainText); using (PasswordDeriveBytes password = new PasswordDeriveBytes(passPhrase null )) { byte [] keyBytes = password.GetBytes(keysize / 8); using (RijndaelManaged symmetricKey = new RijndaelManaged()) { symmetricKey.Mode = CipherMode.CBC; using (ICryptoTransform encryptor = symmetricKey.CreateEncryptor(keyBytes initVectorBytes)) { using (MemoryStream memoryStream = new MemoryStream()) { using (CryptoStream cryptoStream = new CryptoStream(memoryStream encryptor CryptoStreamMode.Write)) { cryptoStream.Write(plainTextBytes 0 plainTextBytes.Length); cryptoStream.FlushFinalBlock(); byte [] cipherTextBytes = memoryStream.ToArray(); return Convert.ToBase64String(cipherTextBytes); } } } } } } catch (Exception) { return string .Empty; } } public static string Decrypt( string cipherText string passPhrase) { try { byte [] cipherTextBytes = Convert.FromBase64String(cipherText); using (PasswordDeriveBytes password = new PasswordDeriveBytes(passPhrase null )) { byte [] keyBytes = password.GetBytes(keysize / 8); using (RijndaelManaged symmetricKey = new RijndaelManaged()) { symmetricKey.Mode = CipherMode.CBC; using (ICryptoTransform decryptor = symmetricKey.CreateDecryptor(keyBytes initVectorBytes)) { using (MemoryStream memoryStream = new MemoryStream(cipherTextBytes)) { using (CryptoStream cryptoStream = new CryptoStream(memoryStream decryptor CryptoStreamMode.Read)) { byte [] plainTextBytes = new byte [cipherTextBytes.Length]; int decryptedByteCount = cryptoStream.Read(plainTextBytes 0 plainTextBytes.Length); return Encoding.UTF8.GetString(plainTextBytes 0 decryptedByteCount); } } } } } } catch (Exception) { return string .Empty; } } }