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AES Functional Description
617
SWRU543–January 2019
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Advance Encryption Standard Accelerator (AES)
CBC Feedback Mode
Figure 17-3 shows the CBC feedback mode of operation, where the input data is XORed with the IV
before it is passed to the basic cryptographic core. The output of the cryptographic core passes directly to
the output buffer and becomes the next IV.
The operation is reversed for decryption, resulting in an XOR at the output of the cryptographic core. The
input cipher text of the current operation is the IV for the next operation.
Figure 17-3. AES - CBC Feedback Mode
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