Encrypts/decrypts only first 16 bytes of data about arduinoaes256

[qistoph]

"AES is a variant of Rijndael which has a fixed block size of 128 bits, and a key size of 128, 192, or 256 bits." (http://en.wikipedia.org/wiki/Advanced_Encryption_Standard)

You will have to update the data in blocks of 128 bits.

Try something like this:

// data[32]
aes256_encrypt_ecb(&ctxt, data); // encrypt first block of 128 bits in place
aes256_encrypt_ecb(&ctxt, data+16); // encrypt second block of 128 bits in place
DUMP("Encrypted data: ", i, data, sizeof(data));

aes256_decrypt_ecb(&ctxt, data); // decrypt first block of 128 bits in place
aes256_decrypt_ecb(&ctxt, data+16); // decrypt second block of 128 bits in place
DUMP("Back decrypted data: ", i, data, sizeof(data));

[spinningarrow]

That helps; thank you!

[qistoph]

Please be aware though that the described method performs ECB mode encryption.

Have a look at http://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Electronic_codebook_.28ECB.29 for more details.