Firmware description

AN3992

8/22

Doc ID 022369 Rev 3

3

Firmware description

3.1

AES hardware

The Advanced Encryption Standard (AES) hardware accelerator can be used to encrypt

(encipher) and decrypt (decipher) 128-bit blocks using a 128-bit key length.

Figure 2.

AES hardware accelerator

The AES hardware accelerator provides four modes of operation:

1.

Encryption mode

2.

Decryption mode (using decryption key)

3.

Key derivation mode

4.

Key derivation and decryption mode (using encryption key)

MS19976V1

CR95HF and STM8L

AES hardware accelerator

128-bit cipher text

128-bit plain text

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Key