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@@ -1,11 +1,11 @@ ### Tiny AES128 in C -This is a small portable implementation of AES128 in C. This is the smallest implementation in C I've seen yet, but if you find something smaller (or have improvements for the code in this project) please contact me or fork the project. +This is a small and portable implementation of the AES128 algorithm implemented in C. +The module uses just a bit more than 200 bytes of RAM and 1K ROM when compiled for ARM (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). -The code is tested on Intel 64bit, 32bit ARM Cortex-M3 and 8 bit Atmel Mega16. -The module uses just a bit more than 200 bytes of RAM and 1K ROM when compiled for ARM. -YMMV depending on target platform and optimization skills of your compiler. +I've successfully used the code on 64bit x86, 32bit ARM and 8 bit AVR platforms. GCC size output when compiled for ARM: @@ -33,4 +33,5 @@ Somehow, -O2 is a bit smaller than -Os with this compiler. I am using Mentor Gra The implementation is verified against the data in: [National Institute of Standards and Technology Special Publication 800-38A 2001 ED](http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf) Appendix F: Example Vectors for Modes of Operation of the AES. -Note: AES128 ECB is symmetric, so you use the same function for encrypting and decrypting. + + |