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"""

Password generation for the IPython notebook.

"""

#-----------------------------------------------------------------------------

# Imports

#-----------------------------------------------------------------------------

# Stdlib

import getpass

import hashlib

import random

# Our own

from IPython.core.error import UsageError

from IPython.utils.py3compat import cast_bytes, str_to_bytes

#-----------------------------------------------------------------------------

# Globals

#-----------------------------------------------------------------------------

# Length of the salt in nr of hex chars, which implies salt_len * 4

# bits of randomness.

salt_len = 12

#-----------------------------------------------------------------------------

# Functions

#-----------------------------------------------------------------------------

def passwd(passphrase=None, algorithm='sha1'):

"""Generate hashed password and salt for use in notebook configuration.

In the notebook configuration, set `c.NotebookApp.password` to

the generated string.

Parameters

----------

passphrase : str

Password to hash. If unspecified, the user is asked to input

and verify a password.

algorithm : str

Hashing algorithm to use (e.g, 'sha1' or any argument supported

by :func:`hashlib.new`).

Returns

-------

hashed_passphrase : str

Hashed password, in the format 'hash_algorithm:salt:passphrase_hash'.

Examples

--------

>>> passwd('mypassword')

'sha1:7cf3:b7d6da294ea9592a9480c8f52e63cd42cfb9dd12'

"""

if passphrase is None:

for i in range(3):

p0 = getpass.getpass('Enter password: ')

p1 = getpass.getpass('Verify password: ')

if p0 == p1:

passphrase = p0

break

else:

print('Passwords do not match.')

else:

raise UsageError('No matching passwords found. Giving up.')

h = hashlib.new(algorithm)

salt = ('%0' + str(salt_len) + 'x') % random.getrandbits(4 * salt_len)

h.update(cast_bytes(passphrase, 'utf-8') + str_to_bytes(salt, 'ascii'))

return ':'.join((algorithm, salt, h.hexdigest()))

def passwd_check(hashed_passphrase, passphrase):

"""Verify that a given passphrase matches its hashed version.

Parameters

----------

hashed_passphrase : str

Hashed password, in the format returned by `passwd`.

passphrase : str

Passphrase to validate.

Returns

-------

valid : bool

True if the passphrase matches the hash.

Examples

--------

>>> from IPython.lib.security import passwd_check

>>> passwd_check('sha1:0e112c3ddfce:a68df677475c2b47b6e86d0467eec97ac5f4b85a',

... 'mypassword')

True

>>> passwd_check('sha1:0e112c3ddfce:a68df677475c2b47b6e86d0467eec97ac5f4b85a',

... 'anotherpassword')

False

"""

try:

algorithm, salt, pw_digest = hashed_passphrase.split(':', 2)

except (ValueError, TypeError):

return False

try:

h = hashlib.new(algorithm)

except ValueError:

return False

if len(pw_digest) == 0:

return False

h.update(cast_bytes(passphrase, 'utf-8') + cast_bytes(salt, 'ascii'))

return h.hexdigest() == pw_digest