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

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// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
// 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
#include <bcrypt.h>
const (
status_success = 0x00000000
bcrypt_use_system_preferred_rng = 0x00000002
)
// read returns an array of `bytes_needed` random bytes read from the OS.
pub fn read(bytes_needed int) ?[]byte {
mut buffer := []byte{len: bytes_needed}
// 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{})
}
return buffer
}