Crypto: AES CTR
The AES CTR sample shows how to perform AES encryption and decryption operations using the CTR block cipher mode without padding and a 128-bit AES key.
Requirements
The sample supports the following development kits:
Hardware platforms |
PCA |
Board name |
Build target |
|---|---|---|---|
PCA10090 |
|
||
PCA10095 |
|
||
PCA10056 |
|
When built for an _ns build target, the sample is configured to compile and run as a non-secure application.
Therefore, it automatically includes Trusted Firmware-M that prepares the required peripherals and secure services to be available for the application.
Overview
The sample performs the following operations:
Initialization:
The Platform Security Architecture (PSA) API is initialized.
A random AES key is generated and imported into the PSA crypto keystore.
Encryption and decryption of a sample plaintext:
A random initialization vector (IV) is generated.
Encryption is performed.
Decryption is performed.
Cleanup:
The AES key is removed from the PSA crypto keystore.
Building and running
This sample can be found under samples/crypto/aes_ctr in the nRF Connect SDK folder structure.
When built as a non-secure firmware image for the _ns build target, the sample automatically includes the Trusted Firmware-M (TF-M).
See Building and programming an application for information about how to build and program the application and Testing and debugging an application for general information about testing and debugging in the nRF Connect SDK.
Testing
After programming the sample to your development kit, complete the following steps to test it:
Connect to the kit with a terminal emulator (for example, PuTTY). See How to connect with PuTTY for the required settings.
Compile and program the application.
Observe the logs from the application using an RTT Viewer or a terminal emulator.
Note
By default, the sample is configured to use both RTT and UART for logging. If you are using RTT, skip the first step of the testing procedure.