hashlib : the names of the different hash algorithms

[chaica]

BPO	7418
Nosy	@rhettinger, @gpshead, @merwok, @florentx
Files	algorithms_constant_attribute_in_hashlib_module.diff algorithms_constant_attribute_in_hashlib_module_update1.diff: Patch for the hashlib module - update 1

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/gpshead'
closed_at = <Date 2010-09-06.08:34:47.559>
created_at = <Date 2009-12-01.14:04:27.195>
labels = ['type-feature', 'library']
title = 'hashlib : the names of the different hash algorithms'
updated_at = <Date 2010-09-06.18:43:24.035>
user = 'https://bugs.python.org/chaica'

bugs.python.org fields:

activity = <Date 2010-09-06.18:43:24.035>
actor = 'eric.araujo'
assignee = 'gregory.p.smith'
closed = True
closed_date = <Date 2010-09-06.08:34:47.559>
closer = 'gregory.p.smith'
components = ['Library (Lib)']
creation = <Date 2009-12-01.14:04:27.195>
creator = 'chaica_'
dependencies = []
files = ['15427', '15438']
hgrepos = []
issue_num = 7418
keywords = ['patch']
message_count = 13.0
messages = ['95857', '95860', '95899', '95900', '96854', '99147', '99155', '100236', '115684', '115688', '115689', '115693', '115727']
nosy_count = 6.0
nosy_names = ['rhettinger', 'gregory.p.smith', 'gps', 'eric.araujo', 'flox', 'chaica_']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue7418'
versions = ['Python 3.2']

[chaica]

Hi,

The hashlib module could provide a tuple offering the names of the
different hash algorithms which are guaranteed to be supported.

The expected result:

>>> import hashlib
>>> hashlib.algorithms
('md5', 'sha1', 'sha224', 'sha256', 'sha384', 'sha512')

Here is a patch to do so. It also provides an update for the hashlib
documentation and a test case.

Bye,
Carl Chenet

[florentx]

I guess you missed the quotes.

$ ./python foo.py 
Traceback (most recent call last):
  File "foo.py", line 2, in <module>
    from hashlib import *
TypeError: attribute name must be string, not 'tuple'

[chaica]

flox : You're right, sorry about that.

Here is a fixed patch.

[chaica]

The fixed file :
algorithms_constant_attribute_in_hashlib_module_update1.diff

[chaica]

Hi,

Maybe you have some ideas on this patch? I think it could be a nice
feature e.g in my app I need to support every hash algorithms available
so with optparse module it is possible to write something like :

    for \_\_hashtype in ('md5', 'sha1',

'sha224','sha256','sha384','sha512'):
__parser.add_option('--{}'.format(__hashtype), dest='hashtype',
action='store_const', const='{}'.format(__hashtype),
help='use the {} hash algorithm type'.format(__hashtype))
__options, _ = __parser.parse_args()

And it would be better if this tuple could be provided by the hashlib
module itself, making the code more evolutive.

[rhettinger]

I'll be taking a look at this patch during the sprints at Pycon. Will get back to you soonish :-)

[rhettinger]

I'll be taking a look at this patch during the sprints at Pycon. Will get back to you soonish :-)

[gpshead]

applied, it'll appear in 2.7 and 3.2.

r78528 and r78529.

[merwok]

Could the module also grow an attribute listing all available algos, or non-guaranteed algos? (Please tell me if I should open a new report.)

[gpshead]

Sounds like a good idea. frozensets for both.

[merwok]

Thanks for the reply. Reopening.

I cannot propose a patch since I don’t know how to introspect OpenSSL (or how to write C, for that matter).

[gpshead]

Implemented in py3k r84554.

[merwok]

Great, thank you!