Figure 216. Block Diagram (Stm32F415/417Xx); Cryp Functional Description - STMicroelectronics STM32F405 Reference Manual

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23.3

CRYP functional description

The cryptographic processor implements a Triple-DES (TDES, that also supports DES) core
and an AES cryptographic core.
cores.
Since the TDES and the AES algorithms use block ciphers, incomplete input data blocks
have to be padded prior to encryption (extra bits should be appended to the trailing end of
the data string). After decryption, the padding has to be discarded. The hardware does not
manage the padding operation, the software has to handle it.
Figure 216
Section 23.3.1
shows the block diagram of the cryptographic processor.

Figure 216. Block diagram (STM32F415/417xx)

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Cryptographic processor (CRYP)
and Section 23.3.2 provide details on these
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