///<summary>
/// Decrypt a file using Rijndael algorithm.
///</summary>
/// <param name="file">Encrypted source file</param>
/// <param name="password">Password</param>
/// <returns>Decoded content string</returns>
public static string Decrypt(string file, string password)
{
string content = string.Empty;
try
{
UnicodeEncoding uniEnc = new UnicodeEncoding();
KeyGen key = new KeyGen(password);
FileStream fsCrypt = new FileStream(file, FileMode.Open);
RijndaelManaged RMCrypto = new RijndaelManaged();
CryptoStream cs = new CryptoStream(fsCrypt,
RMCrypto.CreateDecryptor(key.Key, key.IV),
CryptoStreamMode.Read);
int data;
List <byte> contentBytes = new List <byte>();
while ((data = cs.ReadByte()) != -1)
{
contentBytes.Add((byte)data);
}
content += uniEnc.GetString(contentBytes.ToArray());
cs.Close();
fsCrypt.Close();
}
catch
{
content = string.Empty;
}
return(content);
}
///<summary>
/// Encrypt a file using Rijndael algorithm.
///</summary>
/// <param name="content">Text to encrypt</param>
/// <param name="password">Password</param>
/// <param name="file">Target file name</param>
/// <returns>True on success, false on failure</returns>
public static bool Encrypt(string content, string password, string file)
{
bool success = true;
try
{
UnicodeEncoding uniEnc = new UnicodeEncoding();
KeyGen key = new KeyGen(password);
string cryptFile = file;
FileStream fsCrypt = new FileStream(cryptFile, FileMode.Create);
RijndaelManaged RMCrypto = new RijndaelManaged();
CryptoStream cs = new CryptoStream(fsCrypt,
RMCrypto.CreateEncryptor(key.Key, key.IV),
CryptoStreamMode.Write);
byte[] contentBytes = uniEnc.GetBytes(content);
foreach (byte b in contentBytes)
{
cs.WriteByte(b);
}
cs.Close();
fsCrypt.Close();
}
catch
{
success = false;
}
return(success);
}
