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replace user rand by platform rand in ecc delays

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Signed-off-by: Shelly Liberman <shelly.liberman@arm.com>
This commit is contained in:
Shelly Liberman 2020-09-13 15:23:56 +03:00
parent 6f3a987ae3
commit 05beb9ac70
3 changed files with 30 additions and 1 deletions
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9
include/mbedtls/platform_util.h
View File

@ -300,6 +300,15 @@ uint32_t mbedtls_platform_random_in_range( uint32_t num );
*/
void mbedtls_platform_random_delay( void );
/**
* \brief RNG-function for getting a random buffer.
*
* \param buf Buffer for random data
* \param len Length of the buffer in bytes
*
*/
void mbedtls_platform_random_buf( uint8_t *buf, size_t len);
#if defined(MBEDTLS_HAVE_TIME_DATE)
/**
* \brief Platform-specific implementation of gmtime_r()

19
library/platform_util.c
View File

@ -319,6 +319,25 @@ uint32_t mbedtls_platform_random_uint32( void )
mbedtls_platform_random_uint16() );
}
void mbedtls_platform_random_buf( uint8_t *buf, size_t len )
{
uint16_t val;
while( len > 1 )
{
val = mbedtls_platform_random_uint16();
buf[len-1] = (uint8_t)val;
buf[len-2] = (uint8_t)(val>>8);
len -= 2;
}
if( len == 1 )
{
buf[0] = (uint8_t)mbedtls_platform_random_uint16();
}
return;
}
uint32_t mbedtls_platform_random_in_range( uint32_t num )
{
uint32_t result;

3
tinycrypt/ecc.c
View File

@ -67,6 +67,7 @@
#include "mbedtls/platform_util.h"
#include "mbedtls/sha256.h"
#include <string.h>
#include "mbedtls/platform_util.h"
/* Parameters for curve NIST P-256 aka secp256r1 */
const uECC_word_t curve_p[NUM_ECC_WORDS] = {
@ -427,7 +428,7 @@ void ecc_wait_state_reset(ecc_wait_state_t *ws)
return;
ws->i = 0;
g_rng_function(ws->delays, sizeof(ws->delays));
mbedtls_platform_random_buf(ws->delays, sizeof(ws->delays));
}
/* Computes result = left * right. Result must be 2 * num_words long.