/// <summary>
/// Create secure string.
/// </summary>
private string CreateSecureString()
{
//?? Create a new random salt for the specified length
// Decrypt will ignore the first pre-fixed number of salt characters
_salt = "AAAAABBB";
// Put a new timestamp in the data to be encrypted
lastEncryptTime = DateTime.Now;
DateTime dtExpirationTim = lastEncryptTime + _expirationTimeSpan;
String sPlainStr = string.Format("{0}{1}{2:yyyyMMddHHmmss}",
_salt, _plainString, dtExpirationTim);
return(SymmetricOperation.EncryptToBase64(AlgorithmType, sPlainStr,
_secretKey, InitVector, ASCIIEncoding.ASCII));
}
/// <summary>
/// Encrypt the data using the symmetric algorithm provided and key. Generates the Initialization Vector.
/// Returns the IV and the encrypted string
/// </summary>
public static SymmetricCipherResults EncryptData(string plainText,
SymmetricAlgorithmTypeEnum symmetricAlgorithm,
string key)
{
SymmetricAlgorithm algorithm = SymmetricOperation.CreateSymmetricAlgorithmProvider(symmetricAlgorithm);
key = SymmetricOperation.MakeKeyLegalSize(symmetricAlgorithm, key);
algorithm.GenerateIV();
string iv = Convert.ToBase64String(algorithm.IV);
string cipherText = SymmetricOperation.EncryptToBase64(symmetricAlgorithm,
plainText, key, algorithm.IV, System.Text.Encoding.UTF8);
return(new SymmetricCipherResults()
{
CipherText = cipherText, IV = iv
});
}
