From a9a5ff5f313a4832227de50f0cd21268cf415bc6 Mon Sep 17 00:00:00 2001 From: Andrzej Kurek Date: Wed, 15 Jul 2020 08:50:59 -0400 Subject: [PATCH] aes: add a comment about expected keybits value. Signed-off-by: Andrzej Kurek --- library/aes.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/library/aes.c b/library/aes.c index c4710c45c..e9e754449 100644 --- a/library/aes.c +++ b/library/aes.c @@ -725,6 +725,8 @@ int mbedtls_aes_setkey_enc( mbedtls_aes_context *ctx, const unsigned char *key, return( mbedtls_aesni_setkey_enc( (unsigned char *) ctx->rk, key, keybits ) ); #endif + /* Three least significant bits are truncated from keybits, which is + * expected to be a multiple of 8. */ mbedtls_platform_memset( RK, 0, keybits >> 3 ); offset = mbedtls_platform_random_in_range( keybits >> 5 );