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public static byte[] GetBytes(this Encoding encoding, SecureString value)
{
    if (encoding is null) throw new ArgumentNullException(nameof(encoding));
    if (value is null || value.Length == 0) return Array.Empty<byte>();

    IntPtr valuePtr = IntPtr.Zero;
    try
    {
        valuePtr = Marshal.SecureStringToGlobalAllocUnicode(value);
        if (valuePtr == IntPtr.Zero) return Array.Empty<byte>();

        unsafe
        {
            char* chars = (char*)valuePtr;
            int byteCount = encoding.GetByteCount(chars, value.Length);

            var result = new byte[byteCount];
            fixed (byte* bytes = result)
            {
                encoding.GetBytes(chars, value.Length, bytes, byteCount);
            }

            return result;
        }
    }
    finally
    {
        if (valuePtr != IntPtr.Zero)
        {
            Marshal.ZeroFreeGlobalAllocUnicode(valuePtr);
        }
    }
}

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