hkdf

library0.0.3pypypi✓ verified 84d ago

Python implementation of HMAC-based Extract-and-Expand Key Derivation Function (HKDF) as defined in RFC 5869. Current version 0.0.3. Low-maintenance, no recent releases.

security

pip install hkdf

github ↗homepage ↗

INSTALL

IMPORT

SIG · HKDF

hkdf

securitypythonv0.0.3

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

Hkdf

✓ from hkdf import Hkdf

✗ from hkdf import HKDF

The class is named Hkdf (capital H, lowercase kdf), not HKDF.

expand_key

✓ from hkdf import Hkdf hkdf = Hkdf(salt, ikm) key = hkdf.expand_key(info, length)

✗ hkdf = Hkdf(salt, ikm) key = hkdf.expand(info, length)

The method is expand_key, not expand.

Derive a 32-byte key using HKDF with random salt and input key material.

from hkdf import Hkdf import os ikm = os.urandom(32) salt = os.urandom(16) info = b'myapp key' hkdf = Hkdf(salt, ikm) key = hkdf.expand_key(info, 32) print(key.hex())

Debug

Known issues

deprecatedThe library is not actively maintained; consider using cryptography.hazmat.primitives.kdf.hkdf.HKDF instead.

fix

Use the cryptography library's HKDF implementation for better security and maintenance.

affects: >=0.0.3

gotchaThe class name is Hkdf (not HKDF) and the method is expand_key (not expand).

fix

Use from hkdf import Hkdf and call hkdf.expand_key(info, length).

affects: >=0.0.3

Errors

Common errors & fixes

ImportError: cannot import name 'HKDF' from 'hkdf'

Using wrong case for class name; correct is Hkdf.

fix

Use from hkdf import Hkdf.

AttributeError: 'Hkdf' object has no attribute 'expand'

Using wrong method name; correct is expand_key.

fix

Use hkdf.expand_key(info, length) instead of hkdf.expand(info, length).

Upgrade

Version history

0.0.3latest on PyPI · released Jun 16, 2015

Audit

Dependencies

No dependency data recorded yet.

Agent activity

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Resources

githubhttps://github.com/casebeer/python-hkdf ↗

homepagehttps://github.com/casebeer/python-hkdf ↗