/// <summary>
/// Generates a cryptographic key from a password.
/// </summary>
/// <param name="password">The password.</param>
/// <param name="keySize">The cipher key size. 256-bit is stronger, but slower.</param>
/// <returns>The cryptographic key.</returns>
public static byte[] GenerateKey(string password, KeySize keySize) {
// Create a salt to help prevent rainbow table attacks
var salt = Hash.Pbkdf2(password, Hash.Sha512(password + password.Length), Settings.HashIterations);
// Generate a key from the password and salt
return Hash.Pbkdf2(password, salt, Settings.HashIterations, (int)keySize / 8);
}
/// <summary>
/// Calculates the MAC for a ciphertext.
/// </summary>
/// <param name="ciphertext">The ciphertext.</param>
/// <param name="key">The key.</param>
/// <returns>The MAC.</returns>
public static byte[] CalculateMac(byte[] ciphertext, byte[] key)
{
return(Hash.Pbkdf2(ciphertext, key, Settings.HashIterations));
}
