/// <summary>
/// Initializes a new instance of the System.Security.Cryptography.PBKDF2 class using a password, a generated salt of the specified size, a number of iterations, and the name of a System.Security.Cryptography.HMAC hashing implementation to derive the key.
/// </summary>
/// <param name="password">The password to derive the key for.</param>
/// <param name="saltSize">The salt to use to derive the key.</param>
/// <param name="iterations">The number of iterations to use to derive the key.</param>
/// <param name="hashName">The name of the System.Security.Cryptography.HMAC implementation to use to derive the key.</param>
/// <exception cref="System.ArgumentNullException">The password or algorithm is null.</exception>
/// <exception cref="System.ArgumentException">The salt size is less than 8 or the iterations is less than 1.</exception>
public PBKDF2(string password, int saltSize, int iterations, string hashName)
{
if (string.IsNullOrWhiteSpace(password))
{
throw new ArgumentNullException("password");
}
if (string.IsNullOrWhiteSpace(hashName))
{
throw new ArgumentNullException("hashName");
}
if (saltSize < 8)
{
throw new ArgumentOutOfRangeException("saltSize", "Argument cannot be less than 8.");
}
if (iterations < 1)
{
throw new ArgumentException("Argument must be greater than zero.", "iterations");
}
_password = new UTF8Encoding(false).GetBytes(password);
_salt = Utils.GenerateSalt(saltSize);
_hashName = hashName;
_iterationCount = (uint)iterations;
Initialize();
}