How this block appears in a Simulink model?
What can be configured?
Configuration Parameter |
Selectable Option/Value |
Description |
Mode |
--CBC--CTR-- |
CBC (Cipher-Block Chaining): Encrypt all as a single unit, or block, with a cipher key. CTR (Counter mode): Each message is associated to a counter which must be unique across all messages that get encrypted with the same key. |
AES Type |
--Encrypt--Decrypt |
Select the method that need to be used. Note: for CTR mode it will select automatically. |
Bit Size |
--128--192--256-- |
Select the bit size of the key. It must be 16 (AES-128), 24 (AES-192), or 32 (AES-256) bytes long. |
Initialize initialization vector internally |
|
To make it initialize internally. |
Output buffer size |
|
Enter the size of the output buffer. |
Output type |
--String--Hexadecimal string-- |
Select output type |
INPUT/ OUTPUT Port
Port Name |
Port Type |
Date Type |
Description |
Key |
Vector |
uint8 |
Key is the password to used with the encryption and decryption. The array size of the key depends on the AES bit size. * AES-128 : 16byte key * AES-192 : 24byte key * AES-256 : 32byte key |
Message In |
Scalar/Vector |
uint8 |
Input message(encrypt/decrypt) |
Message Out |
Scalar/Vector |
uint8 |
Output message(encrypt/decrypt) |
IV |
Vector |
uint8 |
For user defined Initialization vector with an array size of 16 bytes |
When to use this block?
AES (Advanced Encryption Standard) block can be used to encrypt and decrypt messages.
Demo
Demo file : esp32_aes_demo.slx
Here is the contents under each subsystem. Two subsystems are design to categorized encryption and decryption.
Description
This demo will show how user can encrypt some data and convert it back to original readable text by decryption. Demo file mainly using two String_processing_block to enter the key and the message. There are two triggered subsystems activating by a step block. Each block have AES_encryption_block to do the encryption and decryption. Because of the triggered subsystem this program will execute only once(Both encrypt and the decryption). From the serial monitor user can be able to see the results of the test as in the picture bellow. Make sure the baud rate is correct(115200).
Example is only for the CBC mode. Try CTR mode also.
