SPRUJ17H March 2022 – October 2024 AM2631 , AM2631-Q1 , AM2632 , AM2632-Q1 , AM2634 , AM2634-Q1
Figure 7-92 illustrates the full block (128-bit) Cipher Feedback (CFB) mode of operation for both encryption and decryption. The input for the crypto core is the IV; the result is XOR-ed with the data. The result is fed back via the IV register, as the next input for the crypto core. The decrypt operation is reversed, but the crypto core is still performing an encryption.