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Use mbedtls_platform_zeroize in uecc code

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ecc_dh.c used memset and gcc-specific asm-commands, changed those
to use mbedtls_platform_zeroize to allow compilation with different
compilers.
This commit is contained in:
Jarno Lamsa 2019-04-25 09:03:19 +03:00
parent 9454dfaed4
commit 187fbb1334
1 changed files with 5 additions and 7 deletions
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10
tinycrypt/ecc_dh.c
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@ -57,6 +57,7 @@
#include <tinycrypt/ecc.h> #include <tinycrypt/ecc.h>
#include <tinycrypt/ecc_dh.h> #include <tinycrypt/ecc_dh.h>
#include <string.h> #include <string.h>
#include "mbedtls/platform_util.h"
#if default_RNG_defined #if default_RNG_defined
static uECC_RNG_Function g_rng_function = &default_CSPRNG; static uECC_RNG_Function g_rng_function = &default_CSPRNG;
@ -188,12 +189,9 @@ int uECC_shared_secret(const uint8_t *public_key, const uint8_t *private_key,
clear_and_out: clear_and_out:
/* erasing temporary buffer used to store secret: */ /* erasing temporary buffer used to store secret: */
memset(p2, 0, sizeof(p2)); mbedtls_platform_zeroize(p2, sizeof(p2));
__asm__ __volatile__("" :: "g"(p2) : "memory"); mbedtls_platform_zeroize(tmp, sizeof(tmp));
memset(tmp, 0, sizeof(tmp)); mbedtls_platform_zeroize(_private, sizeof(_private));
__asm__ __volatile__("" :: "g"(tmp) : "memory");
memset(_private, 0, sizeof(_private));
__asm__ __volatile__("" :: "g"(_private) : "memory");
return r; return r;
} }