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

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