/// <summary>
/// Implements the PBKDF1 key derivation function, as defined in §5.1, RFC 2898 (PKCS#5).
/// </summary>
/// <param name="Password">Password</param>
/// <param name="Iterations">Number of iterations</param>
/// <param name="KeyLength">Length of generated keys.</param>
/// <param name="HashFunction">Hash function.</param>
public Pbkdf1(string Password, int Iterations, int KeyLength, HashFunction HashFunction)
: base(Password)
{
if (Iterations <= 0)
{
throw new ArgumentException("Must be postitive.", nameof(Iterations));
}
if (KeyLength <= 0)
{
throw new ArgumentException("Must be postitive.", nameof(Iterations));
}
this.iterations = Iterations;
this.salt = PfxEncoder.GetRandomBytes(8);
byte[] Bin = Hashes.ComputeHash(HashFunction,
Primitives.CONCAT(Encoding.UTF8.GetBytes(Password), this.salt));
while (--Iterations >= 0)
{
Bin = Hashes.ComputeHash(HashFunction, Bin);
}
if (KeyLength > Bin.Length)
{
throw new ArgumentException("Derived key too long.", nameof(KeyLength));
}
this.key = new byte[KeyLength];
Array.Copy(Bin, 0, this.key, 0, KeyLength);
}