commit ac6d2269393f699a303e858913586b731630c6bf
author Arto Kinnunen <arto.kinnunen@arm.com> Thu Jan 09 10:11:20 2020 +0200
committer Arto Kinnunen <arto.kinnunen@arm.com> Thu Jan 09 10:19:07 2020 +0200
tree 25dbe398101867f4b40e4eead4a74106fb834aa5
parent 7195571681ec4793f04758ee0ec55de418d2bb69

Update signature of mbedtls_platform_random_delay

Skip parameter and return value from mbedtls_platform_random_delay
to make it more resistant for FI attacks.

library/entropy.c

diff --git a/library/entropy.c b/library/entropy.c
index 8d42dd7..6656ee8 100644
--- a/library/entropy.c
+++ b/library/entropy.c
@@ -273,7 +273,7 @@
         volatile int strong_fi = ctx->source[i].strong;
         if( strong_fi == MBEDTLS_ENTROPY_SOURCE_STRONG )
         {
-            mbedtls_platform_random_delay(50);
+            mbedtls_platform_random_delay();
 
             if( strong_fi == MBEDTLS_ENTROPY_SOURCE_STRONG )
                 have_one_strong_fi = MBEDTLS_ENTROPY_SOURCE_STRONG;
@@ -305,7 +305,7 @@
 
     if( have_one_strong_fi == MBEDTLS_ENTROPY_SOURCE_STRONG )
     {
-        mbedtls_platform_random_delay(50);
+        mbedtls_platform_random_delay();
         if( have_one_strong_fi == MBEDTLS_ENTROPY_SOURCE_STRONG )
         {
             return( ret );