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alif/mpconfigport: Enable os.urandom().

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Uses the SE services to provide random numbers.

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George 2024-01-26 12:00:37 +11:00
parent 4e62ade442
commit c6cb082ed1
2 changed files with 51 additions and 0 deletions
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49
ports/alif/modos.c Normal file
View file

@ -0,0 +1,49 @@
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2024 OpenMV LLC.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "py/runtime.h"
#include "se_services.h"
#if MICROPY_PY_OS_URANDOM
static mp_obj_t mp_os_urandom(mp_obj_t num) {
mp_int_t n = mp_obj_get_int(num);
vstr_t vstr;
vstr_init_len(&vstr, n);
uint64_t rnd = 0;
size_t rnd_bits = 0;
for (int i = 0; i < n; i++) {
if (rnd_bits == 0) {
rnd = se_services_rand64();
rnd_bits = 64;
}
vstr.buf[i] = rnd;
rnd >>= 8;
rnd_bits -= 8;
}
return mp_obj_new_bytes_from_vstr(&vstr);
}
static MP_DEFINE_CONST_FUN_OBJ_1(mp_os_urandom_obj, mp_os_urandom);
#endif

2
ports/alif/mpconfigport.h
View file

@ -87,10 +87,12 @@
// Extended modules // Extended modules
#define MICROPY_EPOCH_IS_1970 (1) #define MICROPY_EPOCH_IS_1970 (1)
#define MICROPY_PY_OS_INCLUDEFILE "ports/alif/modos.c"
#define MICROPY_PY_OS_DUPTERM (1) #define MICROPY_PY_OS_DUPTERM (1)
#define MICROPY_PY_OS_SEP (1) #define MICROPY_PY_OS_SEP (1)
#define MICROPY_PY_OS_SYNC (1) #define MICROPY_PY_OS_SYNC (1)
#define MICROPY_PY_OS_UNAME (1) #define MICROPY_PY_OS_UNAME (1)
#define MICROPY_PY_OS_URANDOM (1)
#define MICROPY_PY_TIME (1) #define MICROPY_PY_TIME (1)
#define MICROPY_PY_MACHINE (1) #define MICROPY_PY_MACHINE (1)
#define MICROPY_PY_MACHINE_INCLUDEFILE "ports/alif/modmachine.c" #define MICROPY_PY_MACHINE_INCLUDEFILE "ports/alif/modmachine.c"