/// <summary>
/// Decrypts a string
/// </summary>
/// <param name="text">Input string</param>
/// <param name="cryptor">Cryptor</param>
public static string Decrypt(string text, Cryptor cryptor)
{
if(string.IsNullOrEmpty(text))
throw new ArgumentException("The parameter is null or empty.", "text");
else if(cryptor == null)
throw new Exception("Crypor is not defined");
var plainText = "";
var baseText = Convert.FromBase64String(text);
using(var ms = new MemoryStream(baseText)) {
var crypt = new RijndaelManaged();
crypt.KeySize = cryptor.KeySize;
crypt.BlockSize = cryptor.BlockSize;
crypt.Key = cryptor.Key;
crypt.IV = cryptor.IV;
crypt.Mode = cryptor.Mode;
using(var cs = new CryptoStream(ms, crypt.CreateDecryptor(), CryptoStreamMode.Read)) {
using(StreamReader sr = new StreamReader(cs))
plainText = sr.ReadToEnd();
}
}
return plainText;
}
/// <summary>
/// Encrypts a string
/// </summary>
/// <param name="text">Input string</param>
/// <param name="cryptor">Cryptor</param>
public static string Encrypt(string text, Cryptor cryptor)
{
if(string.IsNullOrEmpty(text))
throw new ArgumentException("The parameter is null or empty.","text");
else if(cryptor == null)
throw new Exception("Crypor is not defined");
// Setup encryptor and encrypt the message
using(var ms = new MemoryStream()) {
var crypt = new RijndaelManaged() {
KeySize = cryptor.KeySize,
BlockSize = cryptor.BlockSize,
Key = cryptor.Key,
IV = cryptor.IV,
Mode = cryptor.Mode
};
using(var cs = new CryptoStream(ms, crypt.CreateEncryptor(), CryptoStreamMode.Write)) {
using(var sw = new StreamWriter(cs))
sw.Write(text);
}
return Convert.ToBase64String(ms.ToArray());
}
}
/// <summary>
/// Encrypts the contents of a file
/// </summary>
/// <param name="path">Path to file</param>
/// <param name="cryptor">Cryptor information</param>
public static void EncryptFile(string path, string contents, Cryptor cryptor)
{
File.WriteAllText(path, Encrypt(contents, cryptor));
}
/// <summary>
/// Decrypts the contents of a file
/// </summary>
/// <param name="path">Path to file</param>
/// <param name="cryptor">Cryptor information</param>
public static string DecryptFile(string path, Cryptor cryptor)
{
return Decrypt(File.ReadAllText(path), cryptor);
}
