42.1 Overview
The Advanced Encryption Standard (AES) peripheral provides a means for symmetric-key encryption of 128-bit blocks, in compliance to NIST specifications.
The symmetric-key algorithm requires the same key for both encryption and decryption.
Different key sizes are supported. The key size determines the number of repetitions of
transformation rounds that convert the input (plaintext) into the final output
(ciphertext). The number of repetition rounds is as follows:
- 10 rounds of repetition for 128-bit keys
- 12 rounds of repetition for 192-bit keys
- 14 rounds of repetition for 256-bit keys