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

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// Copyright (c) 2019-2020 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
)
pub fn read(bytes_needed int) ?[]byte {
mut buffer := malloc(bytes_needed)
// 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 {
return read_error
}
return c_array_to_bytes_tmp(bytes_needed, buffer)
}