stefins

Hi, Added wrapper around Linux's `getrandom` syscall as mentioned in #1826. ```rust let random_bytes = getrandom(1000, RandomMode::GRND_RANDOM).unwrap(); ``` returns a Vector with 1000 random bytes Thanks :) Signed-off-by: Stefin

```c ssize_t getrandom(void *buf, size_t buflen, unsigned int flags); ```

**Describe the bug** Preserve file mode after decryption **To Reproduce** Steps to reproduce the behavior: 1. Decrypt a file with old mode 100755 2. New mode is overwritten as 100644...

It would be better if `wdcrypt` had a graphical UI