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Do not use mbedtls crt_dbrg as it it not reliable.

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Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
This commit is contained in:
Pol Henarejos
2024-08-25 00:10:53 +02:00
parent 7702401caa
commit e333383a22
2 changed files with 7 additions and 21 deletions
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6
pico_keys_sdk_import.cmake
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@@ -238,13 +238,7 @@ if (ENABLE_EMULATION)
${CMAKE_CURRENT_LIST_DIR}/src/usb/emulation/emulation.c ${CMAKE_CURRENT_LIST_DIR}/src/usb/emulation/emulation.c
) )
set(MBEDTLS_SOURCES ${MBEDTLS_SOURCES} set(MBEDTLS_SOURCES ${MBEDTLS_SOURCES}
${CMAKE_CURRENT_LIST_DIR}/mbedtls/library/ctr_drbg.c
${CMAKE_CURRENT_LIST_DIR}/mbedtls/library/entropy.c
${CMAKE_CURRENT_LIST_DIR}/mbedtls/library/entropy_poll.c
${CMAKE_CURRENT_LIST_DIR}/mbedtls/library/aesni.c ${CMAKE_CURRENT_LIST_DIR}/mbedtls/library/aesni.c
${CMAKE_CURRENT_LIST_DIR}/mbedtls/library/pem.c
${CMAKE_CURRENT_LIST_DIR}/mbedtls/library/x509write.c
${CMAKE_CURRENT_LIST_DIR}/mbedtls/library/base64.c
) )
set(INCLUDES ${INCLUDES} set(INCLUDES ${INCLUDES}
${CMAKE_CURRENT_LIST_DIR}/src/usb/emulation ${CMAKE_CURRENT_LIST_DIR}/src/usb/emulation

22
src/rng/hwrng.c
View File

@@ -19,10 +19,9 @@
#include <string.h> #include <string.h>
#include <stdio.h> #include <stdio.h>
#if defined(ENABLE_EMULATION) #if defined(ENABLE_EMULATION)
#include "mbedtls/entropy.h" #include <stdbool.h>
#include "mbedtls/ctr_drbg.h" #include <stdlib.h>
#include <time.h>
mbedtls_ctr_drbg_context ctr_drbg;
extern uint32_t board_millis(); extern uint32_t board_millis();
#elif (ESP_PLATFORM) #elif (ESP_PLATFORM)
#include "bootloader_random.h" #include "bootloader_random.h"
@@ -42,6 +41,7 @@ extern uint32_t board_millis();
void adc_start() { void adc_start() {
#if defined(ENABLE_EMULATION) #if defined(ENABLE_EMULATION)
srand(time(0));
#elif defined(ESP_PLATFORM) #elif defined(ESP_PLATFORM)
bootloader_random_enable(); bootloader_random_enable();
#else #else
@@ -65,16 +65,6 @@ static uint8_t ep_round = 0;
static void ep_init() { static void ep_init() {
random_word = 0xcbf29ce484222325; random_word = 0xcbf29ce484222325;
ep_round = 0; ep_round = 0;
#ifdef ENABLE_EMULATION
mbedtls_entropy_context entropy;
mbedtls_entropy_init(&entropy);
mbedtls_ctr_drbg_init(&ctr_drbg);
mbedtls_ctr_drbg_seed(&ctr_drbg,
mbedtls_entropy_func,
&entropy,
(const unsigned char *) "RANDOM_GEN",
10);
#endif
} }
/* Here, we assume a little endian architecture. */ /* Here, we assume a little endian architecture. */
@@ -85,7 +75,9 @@ static int ep_process() {
uint64_t word = 0x0; uint64_t word = 0x0;
#if defined(ENABLE_EMULATION) #if defined(ENABLE_EMULATION)
mbedtls_ctr_drbg_random(&ctr_drbg, (uint8_t *) &word, sizeof(word)); word = rand();
word <<= 32;
word |= rand();
#elif defined(ESP_PLATFORM) #elif defined(ESP_PLATFORM)
esp_fill_random((uint8_t *)&word, sizeof(word)); esp_fill_random((uint8_t *)&word, sizeof(word));
#else #else