From 30c47c71b816356b3c591f7f29717b09d914759b Mon Sep 17 00:00:00 2001 From: kokke Date: Sat, 12 Jul 2014 20:52:42 +0200 Subject: Update README.md --- README.md | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/README.md b/README.md index 21c7595..976ffad 100644 --- a/README.md +++ b/README.md @@ -9,7 +9,7 @@ void AES128_ECB_encrypt(uint8_t* input, uint8_t* key, uint8_t *output); void AES128_ECB_decrypt(uint8_t* input, uint8_t* key, uint8_t *output); ``` -The module uses just a bit more than 200 bytes of RAM and 2.5K ROM when compiled for ARM (YMMV). +The module uses just a bit more than 200 bytes of RAM and 2.5K ROM when compiled for ARM (<2K for Thumb but YMMV). It is the smallest implementation in C I've seen yet, but do contact me if you know of something smaller (or have improvements to the code here). @@ -27,6 +27,14 @@ GCC size output when compiled for ARM: 2515 0 204 2719 a9f aes.o +.. and when compiling for the THUMB instruction set, we end up at just below 2K in code size. + + $ arm-none-eabi-gcc -mthumb -Os -c aes.c + $ size aes.o + text data bss dec hex filename + 1883 0 204 2087 827 aes.o + + I am using Mentor Graphics free ARM toolchain: -- cgit v1.2.3