Uploaded Test files

venv/Lib/site-packages/IPython/lib/security.py

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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 encode
+
+#-----------------------------------------------------------------------------
+# 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(encode(passphrase, 'utf-8') + encode(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(encode(passphrase, 'utf-8') + encode(salt, 'ascii'))
+
+    return h.hexdigest() == pw_digest