The Block-Cipher mode of operation is run-time programmable to ECB, CBC, CFB, OFB, or CTR. The AES-P core is available in two variations, the standard AES32-P and the fast AES128-P: AES32-P has a ...
By default, it uses the AES encryption algorithm in CBC mode with a 128-bit key, combined with the Elephant diffuser for additional disk encryption-specific security not provided by AES.
An included configurable wrapper surrounds the AES-C core and implements its fixed Block-Cipher mode of operation. This configurable wrapper supports the ECB, CBC, CFB, OFB and CTR Block-Cipher modes.