Comments (4)
By tricky you mean inconvenient I presume? :)
The situation is as following:
- The library works (as virtually any C library) on bytes. I can’t know what encoding your secrets are in (because it can be any byte, not just readable/printable ones). Trying to guess that in a security context like this, is a road to security vulnerabilities.
hash_password_raw()
also has to return bytes because it does. There’s no applicable encoding.
On the other hand, the encoded hash is always ASCII bytes, therefore I could easily encode/decode it.
But I’ve decided for the sake of:
- simplicity/symmetry (any string is bytes, you don’t have to think about it),
- performance (I still have to pass in bytes and I still get back bytes. if the user doesn't want unicode, there's an extra encoding/decoding round which puts you at a disadvantage to the attacker).
to keep it as bytes too.
As you can see, supporting Unicode would force me to make decisions for the users. In my other libraries I’m usually happy to do so (opinionated software tends to be better software), but this one is a) security-related and b) rather low-level since it’s the direct C-wrapper.
So, at this point we can decide to build higher-level helpers that presume that you always want your Unicode secrets interpreted as UTF-8 when going in and decoded when coming out. Maybe I’ll add something like that at some point, but for know I’d encourage you to build your own simple helpers (which also may contain your parameters?) until clearer usage patterns emerge.
I think I’ll start an FAQ with this. :)
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Thanks for the explanation hynek! I really appreciate it.
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Does http://argon2-cffi.readthedocs.org/en/latest/api.html#module-argon2 do what you need?
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Yes!!! LOL
Thanks a lot!!
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Related Issues (20)
- RFC is no longer a draft (RFC9106); default parameter choice out of date HOT 4
- 21.2.0: pep517 does not build cython modules HOT 6
- 21.1.0: `notebook` test suite is crashing with SIGILL in _cffi_backend.cpython.*so DSO HOT 11
- Inconsistent advice for key derivation HOT 5
- How to avoid timing attacks? HOT 1
- hash function return + / verify issue with sqlite HOT 3
- Question: Can output from argon2.low_level.hash_secret_raw() → bytes directly used to derive aes key? HOT 3
- Associated data cannot be specified in the low_level functions HOT 10
- Support password verification without sending the password from client to server HOT 5
- Make hash verification return True or False HOT 4
- Second salt HOT 1
- hash() got an unexpected keyword argument 'salt' HOT 1
- ImportError: cannot import name 'PasswordHasher' from partially initialized module 'argon2' HOT 1
- Install with poetry on python 3.11.7 --obsolete
- Strange error, can't figure out what is causing it HOT 2
- Make PasswordHasher.check_needs_rehash() accept bytes hash
- Allow use of argon2 "secret" parameter for keyed hashing HOT 1
- Fail to install by pip on macOS 11.0.1 Big Sur HOT 11
- 20.1.0: sphinx warnings HOT 4
- 20.1.0: pytest warnings HOT 3
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