Figure 192. Ecb Decryption Mode - ST STM32L4 5 Series Reference Manual

RM0351
28.5.2 Cipher block chaining (CBC)
In cipher-block chaining (CBC) mode, each block of plain text is XORed with the previous
cipher text block before being encrypted. To make each message unique, an initialization
vector (AES_IVRx) is used during the first block processing.
The initialization vector is XORed after the swapping management block during encryption
mode and before it in decryption mode (refer to
Advanced encryption standard hardware accelerator (AES)

Figure 192. ECB decryption mode

Figure 193
DocID024597 Rev 5
and Figure 194).
821/1830
852