1
0
mirror of https://github.com/vlang/v.git synced 2023-08-10 21:13:21 +03:00
v/vlib/crypto/rand/rand_windows.c.v

26 lines
779 B
V
Raw Normal View History

// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
2019-07-31 04:24:12 +03:00
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module rand
#flag windows -Llibraries/bcrypt
#flag windows -lbcrypt
2019-07-31 04:24:12 +03:00
#include <bcrypt.h>
const (
2020-05-22 18:36:09 +03:00
status_success = 0x00000000
bcrypt_use_system_preferred_rng = 0x00000002
2019-07-31 04:24:12 +03:00
)
// read returns an array of `bytes_needed` random bytes read from the OS.
2020-05-22 18:36:09 +03:00
pub fn read(bytes_needed int) ?[]byte {
2019-07-31 04:24:12 +03:00
mut buffer := malloc(bytes_needed)
2020-05-22 18:36:09 +03:00
// use bcrypt_use_system_preferred_rng because we passed null as algo
status := C.BCryptGenRandom(0, buffer, bytes_needed, bcrypt_use_system_preferred_rng)
if status != status_success {
2019-10-24 14:48:20 +03:00
return read_error
2019-07-31 04:24:12 +03:00
}
return c_array_to_bytes_tmp(bytes_needed, buffer)
}