Unable to use Intel AES-NI sample library to encrypt/decrypt in 32-byte block size

Question

I am trying to use the intel_aes_c library with C++ on Visual Studio to create an encryption method that encrypts in 32-byte block sizes, but even when doing a #define BLOCK_SIZE (32) does not really help.

In general, I would like to ask how I can set block sizes in the Intel AES-NI Sample Library. Any help or clarification to point me in the right way would be greatly appreciated, thank you!

Answer 1

As far as I am aware the block size of plain text cannot be changed (if you are to encrypt it) with AES-NI. This is specified by Intel:

The AES algorithm works by encrypting a fixed block size of 128 bits of plain text in several rounds to produce the final encrypted cipher text. The number of rounds (10, 12, or 14) used depends on the key length (128b, 192b, or 256b). Each round performs a sequence of steps on the input state, which is then fed into the following round. Each round is encrypted using a subkey that is generated using a key schedule. For more details on AES please refer to 1. - Link

The reference mentioned at the end ( 1 ) refers to a wikipedia article about AES which states:

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.