Password cracking

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Steps required for password cracking software:

  1. Identify which columns contain the username and the password (hashed or otherwise).
  2. Identify the algorithm used.
  3. Identify whether a salt is used.

From these there are multiple stages:

  1. If no salt is used (e.g. plain MD5), consult a pre-computed lookup table.

Identifying an algorithm

  • Length: 32 characters is likely to be MD5.
  • Characters: 0-9a-zA-Z is likely to be MD5.

Lookup tables

  • How should these be delivered? Plain text file, SQLite database, Lightning Memory-Mapped Database (LMDB), something else?
  • What options does the chosen language support?
  • Which options are the most efficient?

Libraries

Ultimately most libraries end up being a wrapper around OpenSSL.

Python

hashlib is the Python wrapper around OpenSSL and appears to be in the standard library.