Ejemplo n.º 1
0
        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);
        }
Ejemplo n.º 2
0
        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.
            }
        }