SPRUJB6B November 2024 – May 2025 AM2612
Figure 7-102 CTR/ICM Feedback ModeFigure 7-102 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.