v/vlib/crypto/rand/rand_windows.c.v

26 lines
769 B
V
Raw Normal View History

2022-01-04 10:21:08 +01:00
// Copyright (c) 2019-2022 Alexander Medvednikov. All rights reserved.
2019-07-31 03:24:12 +02:00
// 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 03:24:12 +02:00
#include <bcrypt.h>
const (
2020-05-22 17:36:09 +02:00
status_success = 0x00000000
bcrypt_use_system_preferred_rng = 0x00000002
2019-07-31 03:24:12 +02:00
)
// read returns an array of `bytes_needed` random bytes read from the OS.
2022-04-15 14:35:35 +02:00
pub fn read(bytes_needed int) ?[]u8 {
mut buffer := []u8{len: bytes_needed}
2020-05-22 17:36:09 +02:00
// use bcrypt_use_system_preferred_rng because we passed null as algo
status := C.BCryptGenRandom(0, buffer.data, bytes_needed, rand.bcrypt_use_system_preferred_rng)
if status != rand.status_success {
return IError(&ReadError{})
2019-07-31 03:24:12 +02:00
}
return buffer
2019-07-31 03:24:12 +02:00
}