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### Tiny AES128 in C
This is a small and portable implementation of the AES128 ECB encryption algorithm written in C.
This is a small and portable implementation of the AES128 ECB and CBC encryption algorithms written in C.
The API is very simple and looks like this (I am using C99 `<stdint.h>`-style annotated types):
```C
void AES128_ECB_encrypt(uint8_t* input, const uint8_t* key, uint8_t* output);
void AES128_ECB_decrypt(uint8_t* input, const uint8_t* key, uint8_t* output);
void AES128_CBC_encrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv);
void AES128_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv);
```
You can choose to use one or both of the modes-of-operation, by defining the symbols CBC and ECB. See the header file for clarification.
The module uses around 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).