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AES Functional Description
619
SWRU543–January 2019
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Advance Encryption Standard Accelerator (AES)
CFB Mode
Figure 17-5 shows the full block (128 bits) CFB mode of operation for encryption and decryption. The input
for the cryptographic core is the IV; the result is XORed with the data. The result is fed back through the
IV register as the next input for the cryptographic core. The decryption operation is reversed, but the
cryptographic core still performs encryption.
Figure 17-5. AES - CFB Feedback Mode
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