SPRUJ17H March 2022 – October 2024 AM2631 , AM2631-Q1 , AM2632 , AM2632-Q1 , AM2634 , AM2634-Q1
Figure 7-91 illustrates the Counter Feedback (CTR/ICM) mode of operation. This operation encrypts the IV. The output of the crypto core (encrypted IV) is XOR-ed with the data, creating the output result. The IV is built out of two components, one fixed part and a counter part. The counter part is incremented with each block. The counter width is variable per context and can be 16, 32, 64, 96, or 128-bit wide. Note that in this mode, encryption and decryption use the same operation.