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//@only-target: windows # this directly tests windows-only functions
use core::ffi::c_void;
use core::mem::size_of_val;
use core::ptr::null_mut;
// Windows API definitions.
type NTSTATUS = i32;
type BOOLEAN = u8;
type BOOL = i32; // yes, seriously, BOOL and BOOLEAN are very different...
const BCRYPT_USE_SYSTEM_PREFERRED_RNG: u32 = 0x00000002;
const BCRYPT_RNG_ALG_HANDLE: *mut c_void = 0x81 as *mut c_void;
#[link(name = "bcrypt")]
extern "system" {
fn BCryptGenRandom(
halgorithm: *mut c_void,
pbbuffer: *mut u8,
cbbuffer: u32,
dwflags: u32,
) -> NTSTATUS;
}
#[link(name = "advapi32")]
extern "system" {
#[link_name = "SystemFunction036"]
fn RtlGenRandom(RandomBuffer: *mut u8, RandomBufferLength: u32) -> BOOLEAN;
}
#[cfg(target_arch = "x86")]
#[link(name = "bcryptprimitives", kind = "raw-dylib", import_name_type = "undecorated")]
extern "system" {
fn ProcessPrng(pbdata: *mut u8, cbdata: usize) -> BOOL;
}
#[cfg(not(target_arch = "x86"))]
#[link(name = "bcryptprimitives", kind = "raw-dylib")]
extern "system" {
fn ProcessPrng(pbdata: *mut u8, cbdata: usize) -> BOOL;
}
fn main() {
let mut key = [0u8; 24];
let len: u32 = size_of_val(&key).try_into().unwrap();
let ret = unsafe {
BCryptGenRandom(null_mut(), key.as_mut_ptr(), len, BCRYPT_USE_SYSTEM_PREFERRED_RNG)
};
// NTSTATUS codes use the high bit to indicate an error
assert!(ret >= 0);
let ret = unsafe { BCryptGenRandom(BCRYPT_RNG_ALG_HANDLE, key.as_mut_ptr(), len, 0) };
assert!(ret >= 0);
let ret = unsafe { RtlGenRandom(key.as_mut_ptr(), len) };
// RtlGenRandom returns a BOOLEAN where 0 indicates an error
assert_ne!(ret, 0);
let len = key.len();
let ret = unsafe { ProcessPrng(key.as_mut_ptr(), len) };
// ProcessPrng is documented as always returning `TRUE`.
// https://learn.microsoft.com/en-us/windows/win32/seccng/processprng#return-value
assert_eq!(ret, 1);
}
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