hashlib — hashing algorithms

This module implements binary data hashing algorithms. Each algorithm is exposed as a class whose instances accept incremental data via update() and produce a fixed-size digest via digest(). The OpenMV Cam provides three algorithms:

  • SHA256 - The current generation, modern hashing algorithm (of the SHA-2 series). It is suitable for cryptographically-secure purposes and is always available.

  • SHA1 - A previous generation algorithm. Not recommended for new uses, but SHA1 is part of a number of Internet standards and existing applications, so it remains available.

  • MD5 - A legacy algorithm, not considered cryptographically secure. Provided for interoperability with legacy applications.

Classes

class hashlib.sha256(data: bytes = b'')

Create an SHA256 hasher object and optionally feed data into it.

update(data: bytes) → None

Feed more binary data into the hash.

digest() → bytes

Return the hash of all data passed through it so far, as a bytes object. After this method is called, no more data can be fed into the hash.

Note

hexdigest() is not implemented in MicroPython. Use binascii.hexlify(h.digest()) to obtain a hex string.

class hashlib.sha1(data: bytes = b'')

Create an SHA1 hasher object and optionally feed data into it.

update(data: bytes) → None

Feed more binary data into the hash.

digest() → bytes

Return the hash of all data passed through it so far, as a bytes object. After this method is called, no more data can be fed into the hash.

Note

hexdigest() is not implemented in MicroPython. Use binascii.hexlify(h.digest()) to obtain a hex string.

class hashlib.md5(data: bytes = b'')

Create an MD5 hasher object and optionally feed data into it.

update(data: bytes) → None

Feed more binary data into the hash.

digest() → bytes

Return the hash of all data passed through it so far, as a bytes object. After this method is called, no more data can be fed into the hash.

Note

hexdigest() is not implemented in MicroPython. Use binascii.hexlify(h.digest()) to obtain a hex string.