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Update README.md

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kokke 2017-07-13 10:42:27 +02:00 committed by GitHub
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@ -18,7 +18,7 @@ You can choose to use one or both of the modes-of-operation, by defining the sym
There is no built-in error checking or protection from out-of-bounds memory access errors as a result of malicious input. The two functions AES_ECB_xxcrypt() do most of the work, and they expect inputs of 128 bit length. There is no built-in error checking or protection from out-of-bounds memory access errors as a result of malicious input. The two functions AES_ECB_xxcrypt() do most of the work, and they expect inputs of 128 bit length.
The module uses around 200 bytes of RAM and 2.5K ROM when compiled for ARM (~2K for Thumb but YMMV). The module uses less than 200 bytes of RAM and 2.3K ROM when compiled for ARM (<2K for Thumb but YMMV).
It is one of 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). It is one of 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).
@ -26,22 +26,18 @@ I've successfully used the code on 64bit x86, 32bit ARM and 8 bit AVR platforms.
GCC size output when only ECB mode is compiled for ARM (using 128 bit block size): GCC size output when only ECB mode is compiled for ARM (using 128 bit block size):
$ arm-none-eabi-gcc -Os -c aes.c -DCBC=0 $ arm-none-eabi-gcc -Os -c aes.c -DCBC=0
$ size aes.o $ size aes.o
text data bss dec hex filename text data bss dec hex filename
2316 0 184 2500 9cb aes.o 2071 0 184 2255 8cf aes.o
.. and when compiling for the THUMB instruction set, we end up just above 1.7K in code size.
$ arm-none-eabi-gcc -mthumb -Os -c aes.c -DCBC=0 -DAES128=1
.. and when compiling for the THUMB instruction set, we end up around 2K in code size.
$ arm-none-eabi-gcc -mthumb -Os -c aes.c -DCBC=0
$ size aes.o $ size aes.o
text data bss dec hex filename text data bss dec hex filename
1796 0 184 1980 7a7 aes.o 1551 0 184 1735 6c7 aes.o