commit b2b063ff3538f1a8f8a027009712e67b5a5fc4a9
author Andres Amaya Garcia <andres.amayagarcia@arm.com> Thu Jul 20 16:45:24 2017 +0100
committer Andres Amaya Garcia <andres.amayagarcia@arm.com> Thu Jul 20 16:45:24 2017 +0100
tree 5da35025d5f57885ee0a8b16b337a4a60936d211
parent 3395250f5fb8a996d1a85621446dc752d62f1785

Add comment in entropy.c

library/entropy.c

diff --git a/library/entropy.c b/library/entropy.c
index 67ec901..baca87c 100644
--- a/library/entropy.c
+++ b/library/entropy.c
@@ -366,6 +366,11 @@
     memset( buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE );
 
 #if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
+    /*
+     * Note that at this stage it is assumed that the accumulator was started
+     * in a previous call to entropy_update(). If this is not guaranteed, the
+     * code below will fail.
+     */
     if( ( ret = mbedtls_sha512_finish_ext( &ctx->accumulator, buf ) ) != 0 )
         goto exit;