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esp8266: Implement os.urandom function. 

Uses what is suspected to be a hardware random number generator.
This commit is contained in:
Damien George 2016-03-29 10:29:57 +03:00 committed by Paul Sokolovsky
parent b4070ee8a4
commit 6ca17c1922
2 changed files with 16 additions and 0 deletions
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3
esp8266/etshal.h
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@ -3,6 +3,9 @@
#include <os_type.h>
// see http://esp8266-re.foogod.com/wiki/Random_Number_Generator
#define WDEV_HWRNG ((volatile uint32_t*)0x3ff20e44)
void ets_delay_us();
void ets_intr_lock(void);
void ets_intr_unlock(void);

13
esp8266/moduos.c
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@ -34,6 +34,7 @@
#include "py/objstr.h"
#include "py/runtime.h"
#include "genhdr/mpversion.h"
#include "etshal.h"
#include "user_interface.h"
extern const mp_obj_type_t mp_fat_vfs_type;
@ -92,9 +93,21 @@ STATIC mp_obj_t os_remove(mp_obj_t path_in) {
STATIC MP_DEFINE_CONST_FUN_OBJ_1(os_remove_obj, os_remove);
#endif
STATIC mp_obj_t os_urandom(mp_obj_t num) {
mp_int_t n = mp_obj_get_int(num);
vstr_t vstr;
vstr_init_len(&vstr, n);
for (int i = 0; i < n; i++) {
vstr.buf[i] = *WDEV_HWRNG;
}
return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(os_urandom_obj, os_urandom);
STATIC const mp_rom_map_elem_t os_module_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_uos) },
{ MP_ROM_QSTR(MP_QSTR_uname), MP_ROM_PTR(&os_uname_obj) },
{ MP_ROM_QSTR(MP_QSTR_urandom), MP_ROM_PTR(&os_urandom_obj) },
#if MICROPY_VFS_FAT
{ MP_ROM_QSTR(MP_QSTR_VfsFat), MP_ROM_PTR(&mp_fat_vfs_type) },
{ MP_ROM_QSTR(MP_QSTR_listdir), MP_ROM_PTR(&os_listdir_obj) },