private static void Pbkdf2Core(
ReadOnlySpan <byte> password,
ReadOnlySpan <byte> salt,
Span <byte> destination,
int iterations,
HashAlgorithmName hashAlgorithm)
{
Debug.Assert(hashAlgorithm.Name is not null);
Debug.Assert(iterations > 0);
if (destination.IsEmpty)
{
return;
}
Pbkdf2Implementation.Fill(password, salt, iterations, hashAlgorithm, destination);
}
private static void Pbkdf2Core(
ReadOnlySpan <char> password,
ReadOnlySpan <byte> salt,
Span <byte> destination,
int iterations,
HashAlgorithmName hashAlgorithm)
{
Debug.Assert(hashAlgorithm.Name is not null);
Debug.Assert(iterations > 0);
if (destination.IsEmpty)
{
return;
}
const int MaxPasswordStackSize = 256;
byte[]? rentedPasswordBuffer = null;
int maxEncodedSize = s_throwingUtf8Encoding.GetMaxByteCount(password.Length);
Span <byte> passwordBuffer = maxEncodedSize > MaxPasswordStackSize ?
(rentedPasswordBuffer = CryptoPool.Rent(maxEncodedSize)) :
stackalloc byte[MaxPasswordStackSize];
int passwordBytesWritten = s_throwingUtf8Encoding.GetBytes(password, passwordBuffer);
Span <byte> passwordBytes = passwordBuffer.Slice(0, passwordBytesWritten);
try
{
Pbkdf2Implementation.Fill(passwordBytes, salt, iterations, hashAlgorithm, destination);
}
finally
{
CryptographicOperations.ZeroMemory(passwordBytes);
}
if (rentedPasswordBuffer is not null)
{
CryptoPool.Return(rentedPasswordBuffer, clearSize: 0); // manually cleared above.
}
}