Warning:

To protect the digital assets of creators and enhance system security and stability, the CyberBrick Multi-Function Core Board does not support firmware flashing with any third-party tools! If you need to restore the Multi-Function Core Board to its factory state, please wait for the official recovery tool to be released by CyberBrick. If you proceed to flash the firmware using third-party tools, the firmware of the Multi-Function Core Board will be permanently damaged and cannot be recovered. CyberBrick will not be responsible for any consequences resulting from such operations.

This documentation is adapted from the official MicroPython project. The CyberBrick team has extended the source code with custom interfaces and features to our hardware and application needs.

In addition to these enhancements, certain built-in MicroPython interfaces have been intentionally disabled to protect the system's integrity, and ensure the overall security and reliability of the device. This also facilitates content protection for creators' intellectual property, where applicable.

Portions of the content are derived from the official MicroPython documentation and have been included here under its open-source license to provide users with a consistent and enriched development experience tailored to the CyberBrick platform.

cryptolib – cryptographic ciphers

Classes

class cryptolib.aes

classmethod __init__(key, mode[, IV])

Initialize cipher object, suitable for encryption/decryption. Note: after initialization, cipher object can be use only either for encryption or decryption. Running decrypt() operation after encrypt() or vice versa is not supported.

Parameters are:

• key is an encryption/decryption key (bytes-like).

• mode is:

  • 1 (or cryptolib.MODE_ECB if it exists) for Electronic Code Book (ECB).

  • 2 (or cryptolib.MODE_CBC if it exists) for Cipher Block Chaining (CBC).

  • 6 (or cryptolib.MODE_CTR if it exists) for Counter mode (CTR).

• IV is an initialization vector for CBC mode.

• For Counter mode, IV is the initial value for the counter.

encrypt(in_buf[, out_buf])

Encrypt in_buf. If no out_buf is given result is returned as a newly allocated bytes object. Otherwise, result is written into mutable buffer out_buf. in_buf and out_buf can also refer to the same mutable buffer, in which case data is encrypted in-place.

decrypt(in_buf[, out_buf])

Like encrypt(), but for decryption.