From 2f8f06aa25e9d5ee4fc9fe217543c872b39e4d05 Mon Sep 17 00:00:00 2001
From: Hanno Becker <hanno.becker@arm.com>
Date: Fri, 29 Sep 2017 11:47:26 +0100
Subject: [PATCH] Don't always recompute context length in mbedtls_rsa_get_len

This commit changes the implementation of `mbedtls_rsa_get_len` to return
`ctx->len` instead of always re-computing the modulus' byte-size via
`mbedtls_mpi_size`.
---
 library/rsa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/rsa.c b/library/rsa.c
index 4ee9308bd..862301190 100644
--- a/library/rsa.c
+++ b/library/rsa.c
@@ -923,7 +923,7 @@ void mbedtls_rsa_set_padding( mbedtls_rsa_context *ctx, int padding, int hash_id
 
 size_t mbedtls_rsa_get_len( const mbedtls_rsa_context *ctx )
 {
-    return( mbedtls_mpi_size( &ctx->N ) );
+    return( ctx->len );
 }