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AES Cryptoprocessor Overview

10.1.6.3.3.2 AES-CBC

For AES-CBC operations, the following configuration parameters are required:

• Key from the key store module

• IV from the slave interface

• Control register settings (mode, direction, key size)

• Length of the data

The length field can have any value. If a data stream is finished and the next data stream uses the same

key and control, it is allowed to write only the IV and length field with a new value. The length field may

also be zero, for continued processing.

If the result IV must be read by the host, the SAVE_CONTEXT bit must be set to 1 after processing the

programmed number of bytes.

10.1.6.3.3.3 AES-CTR

For AES-CTR operations, the following configuration parameters are required:

• Key from the key store module

• IV from the slave interface, including initial counter value (usually 0x0000_0001)

• Control register settings (mode, direction, key size)

• Length of the data (may be non-block size aligned)

The length field can have any value. If a data stream is finished and the next data stream uses the same

key and control, only the IV and length field are allowed to written with a new value. The length field can

be zero, resulting in continued processing.

If the result IV must be read by the host, the save_context bit must be set to 1 after processing the

programmed number of bytes.

815

SWCU117A–February 2015–Revised March 2015

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