encryption decryption

Question

The project was running fine earlier but now it is throwing an exception as Bad Data. CryptographicException was unhandled by the user code

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

I think same question is posting again again ...

Nanhe Siddique · Answer

read this link http://forums.asp.net/t/1390152.aspx?How+to+solve+System+Security+Cryptography+CryptographicException+Bad+Data+error http://stackoverflow.com/questions/6555887/occasional-bad-data-error-while-decrypting-the-string-system-security-cryptogr http://forums.asp.net/t/1390152.aspx?How+to+solve+System+Security+Cryptography+CryptographicException+Bad+Data+error it may help you

Upendra Pratap Shahi · Answer

Kindly give database script for this... read below article it may help you.. http://stackoverflow.com/questions/19675103/cryptographicexception-was-unhandled-by-user-code http://www.codeproject.com/Questions/484567/CryptographicplusexceptionplusplusWasplusunhandled