问题描述
Looking to store usernames and passwords in a database, and am wondering what the safest way to do so is. I know I have to use a salt somewhere, but am not sure how to generate it securely or how to apply it to encrypt the password. Some sample Python code would be greatly appreciated. Thanks.
Store the password+salt as a hash and the salt. Take a look at how Django does it: basic docs and source.
In the db they store <type of hash>$<salt>$<hash> in a single char field. You can also store the three parts in separate fields.
The function to set the password:
def set_password(self, raw_password):
import random
algo = 'sha1'
salt = get_hexdigest(algo, str(random.random()), str(random.random()))[:5]
hsh = get_hexdigest(algo, salt, raw_password)
self.password = '%s$%s$%s' % (algo, salt, hsh)
The get_hexdigest is just a thin wrapper around some hashing algorithms. You can use hashlib for that. Something like hashlib.sha1('%s%s' % (salt, hash)).hexdigest()
And the function to check the password:
def check_password(raw_password, enc_password):
"""
Returns a boolean of whether the raw_password was correct. Handles
encryption formats behind the scenes.
"""
algo, salt, hsh = enc_password.split('$')
return hsh == get_hexdigest(algo, salt, raw_password)
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