Я пользуюсь SHA1, не самый безопасный конечно но у меня тут и не ФСБ всё таки.
вот 2 метода для шифровки и дешифровки:
//шифрование
public static string Encrypt(string plainText, string password,
string salt = "Kosher", string hashAlgorithm = "SHA1",
int passwordIterations = 2, string initialVector = "OFRna73m*aze01xY",
int keySize = 256)
{
if (string.IsNullOrEmpty(plainText))
return "";
byte[] initialVectorBytes = Encoding.ASCII.GetBytes(initialVector);
byte[] saltValueBytes = Encoding.ASCII.GetBytes(salt);
byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);
PasswordDeriveBytes derivedPassword = new PasswordDeriveBytes(password, saltValueBytes, hashAlgorithm, passwordIterations);
byte[] keyBytes = derivedPassword.GetBytes(keySize / 8);
RijndaelManaged symmetricKey = new RijndaelManaged();
symmetricKey.Mode = CipherMode.CBC;
byte[] cipherTextBytes = null;
using (ICryptoTransform encryptor = symmetricKey.CreateEncryptor(keyBytes, initialVectorBytes))
{
using (MemoryStream memStream = new MemoryStream())
{
using (CryptoStream cryptoStream = new CryptoStream(memStream, encryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
cryptoStream.FlushFinalBlock();
cipherTextBytes = memStream.ToArray();
memStream.Close();
cryptoStream.Close();
}
}
}
symmetricKey.Clear();
return Convert.ToBase64String(cipherTextBytes);
}
//дешифрование
public static string Decrypt(string cipherText, string password,
string salt = "Kosher", string hashAlgorithm = "SHA1",
int passwordIterations = 2, string initialVector = "OFRna73m*aze01xY",
int keySize = 256)
{
if (string.IsNullOrEmpty(cipherText))
return "";
byte[] initialVectorBytes = Encoding.ASCII.GetBytes(initialVector);
byte[] saltValueBytes = Encoding.ASCII.GetBytes(salt);
byte[] cipherTextBytes = Convert.FromBase64String(cipherText);
PasswordDeriveBytes derivedPassword = new PasswordDeriveBytes(password, saltValueBytes, hashAlgorithm, passwordIterations);
byte[] keyBytes = derivedPassword.GetBytes(keySize / 8);
RijndaelManaged symmetricKey = new RijndaelManaged();
symmetricKey.Mode = CipherMode.CBC;
byte[] plainTextBytes = new byte[cipherTextBytes.Length];
int byteCount = 0;
using (ICryptoTransform decryptor = symmetricKey.CreateDecryptor(keyBytes, initialVectorBytes))
{
using (MemoryStream memStream = new MemoryStream(cipherTextBytes))
{
using (CryptoStream cryptoStream = new CryptoStream(memStream, decryptor, CryptoStreamMode.Read))
{
byteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
memStream.Close();
cryptoStream.Close();
}
}
}
symmetricKey.Clear();
return Encoding.UTF8.GetString(plainTextBytes, 0, byteCount);
}
Ну пользоваться просто:
Encrypt(text, password); //где text — текст который необходимо зашифровать,password — пароль для шифровки
Decrypt(text, password); //аналогично
. . .
// UPD1: можно воспользоваться и более сложной схемой включая размер ключа и байт
Encrypt(text, password1, password2, «SHA1», 2,«16CHARSLONG12345», 256);
Decrypt(text, password1, password2, «SHA1», 2,«16CHARSLONG12345», 256);
