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Replace mbedtls_platform_enforce_volatile_reads

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Replace function mbedtls_platform_enforce_volatile_reads() with
mbedtls_platform_random_delay().
This commit is contained in:
Arto Kinnunen
2019-12-30 17:32:58 +02:00
parent dbf2b43ceb
commit e91f0dc905
6 changed files with 12 additions and 28 deletions
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14
tinycrypt/ecc.c
View File

@@ -168,7 +168,7 @@ static int uECC_check_curve_integrity(void)
}
/* i should be 32 */
mbedtls_platform_enforce_volatile_reads();
mbedtls_platform_random_delay( 10 );
diff |= (unsigned char) i ^ 32;
return diff;
@@ -296,7 +296,7 @@ uECC_word_t uECC_vli_equal(const uECC_word_t *left, const uECC_word_t *right)
}
/* i should be -1 now */
mbedtls_platform_enforce_volatile_reads();
mbedtls_platform_random_delay( 10 );
diff |= i ^ -1;
return diff;
@@ -1046,7 +1046,7 @@ int EccPoint_mult_safer(uECC_word_t * result, const uECC_word_t * point,
if (problem != 0) {
return UECC_FAULT_DETECTED;
}
mbedtls_platform_enforce_volatile_reads();
mbedtls_platform_random_delay( 50 );
if (problem != 0) {
return UECC_FAULT_DETECTED;
}
@@ -1058,7 +1058,7 @@ int EccPoint_mult_safer(uECC_word_t * result, const uECC_word_t * point,
/* invalid input, can happen without fault */
return UECC_FAILURE;
}
mbedtls_platform_enforce_volatile_reads();
mbedtls_platform_random_delay( 50 );
if (problem != 0) {
/* failure on second check means fault, though */
return UECC_FAULT_DETECTED;
@@ -1088,7 +1088,7 @@ int EccPoint_mult_safer(uECC_word_t * result, const uECC_word_t * point,
r = UECC_FAULT_DETECTED;
goto clear_and_out;
}
mbedtls_platform_enforce_volatile_reads();
mbedtls_platform_random_delay( 10 );
if (problem != 0) {
r = UECC_FAULT_DETECTED;
goto clear_and_out;
@@ -1101,7 +1101,7 @@ int EccPoint_mult_safer(uECC_word_t * result, const uECC_word_t * point,
r = UECC_FAULT_DETECTED;
goto clear_and_out;
}
mbedtls_platform_enforce_volatile_reads();
mbedtls_platform_random_delay( 10 );
if (problem != 0) {
r = UECC_FAULT_DETECTED;
goto clear_and_out;
@@ -1198,7 +1198,7 @@ int uECC_valid_point(const uECC_word_t *point)
/* Make sure that y^2 == x^3 + ax + b */
diff = uECC_vli_equal(tmp1, tmp2);
if (diff == 0) {
mbedtls_platform_enforce_volatile_reads();
mbedtls_platform_random_delay( 10 );
if (diff == 0) {
return 0;
}

2
tinycrypt/ecc_dsa.c
View File

@@ -299,7 +299,7 @@ int uECC_verify(const uint8_t *public_key, const uint8_t *message_hash,
/* Accept only if v == r. */
diff = uECC_vli_equal(rx, r);
if (diff == 0) {
mbedtls_platform_enforce_volatile_reads();
mbedtls_platform_random_delay( 50 );
if (diff == 0) {
return UECC_SUCCESS;
}