openwall / openwall/john

Add support for bcrypt_sha256

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#4,095 3 comments 0 reactions 0 assignees View on GitHub

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enhancement new format
Dominant language
C
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Description

Feature request. Add support for this format. It is used by some web frameworks, like CTFd. Python code for the format:

>>> from passlib.hash import bcrypt_sha256
>>> bcrypt_sha256.hash('john')
'$bcrypt-sha256$2b,12$B2bcgGrxCAOZdbU/TDlP6e$8G1QvMXLUpqw1l79lmIRbFMpw1tJwqS'
>>> bcrypt_sha256.verify('john', '$bcrypt-sha256$2b,12$B2bcgGrxCAOZdbU/TDlP6e$8G1QvMXLUpqw1l79lmIRbFMpw1tJwqS')
True

The format internally uses:

bcrypt(base64(sha256_raw($plain)))

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Use the issue's bcrypt_sha256 example and the stated bcrypt(base64(sha256_raw($plain))) construction as the behavioral reference. Locate the repository's existing password-hash format implementations and related verification tests, then confirm support by matching the supplied hash and password behavior.

Written by the indexing model from the issue text.

Assessment

Tech stack
c
Domain
cryptography, security
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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