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@ -1,6 +1,6 @@
### Tiny AES in C ### Tiny AES in C
This is a small and portable implementation of the AES ECB and CBC encryption algorithms written in C. This is a small and portable implementation of the AES ECB, CTR and CBC encryption algorithms written in C.
You can override the default block-size of 128 bit with 192 or 256 bit by defining the symbols AES192 or AES256 in `aes.h`. You can override the default block-size of 128 bit with 192 or 256 bit by defining the symbols AES192 or AES256 in `aes.h`.
@ -11,6 +11,9 @@ void AES_ECB_encrypt(uint8_t* input, const uint8_t* key, uint8_t* output);
void AES_ECB_decrypt(uint8_t* input, const uint8_t* key, uint8_t* output); void AES_ECB_decrypt(uint8_t* input, const uint8_t* key, uint8_t* output);
void AES_CBC_encrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv); void AES_CBC_encrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv);
void AES_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv); void AES_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv);
/* Symmetrical operation: same function for encrypting as for decrypting */
void AES_CTR_xcrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv);
``` ```
@ -26,7 +29,7 @@ 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 -DCTR=0
$ size aes.o $ size aes.o
text data bss dec hex filename text data bss dec hex filename
2015 0 184 2199 897 aes.o 2015 0 184 2199 897 aes.o
@ -34,7 +37,7 @@ GCC size output when only ECB mode is compiled for ARM (using 128 bit block size
.. and when compiling for the THUMB instruction set, we end up just above 1.7K in code size. .. 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 $ arm-none-eabi-gcc -mthumb -Os -c aes.c -DCBC=0 -DCTR=0
$ size aes.o $ size aes.o
text data bss dec hex filename text data bss dec hex filename
1499 0 184 1683 693 aes.o 1499 0 184 1683 693 aes.o