Figure 177. Ctr Mode Encryption; Figure 178. Ctr Mode Decryption; Counter Mode (Ctr) - ST STM32L4x6 Reference Manual

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25.5.3

Counter Mode (CTR)

In counter mode, a 32-bit counter is used in addition to a nonce value for the XOR operation
with the cipher text or plain text (refer to
Advanced encryption standard hardware accelerator (AES)
Figure 177

Figure 177. CTR mode encryption

Figure 178. CTR mode decryption

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and Figure 178).
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