From 458120dd40db6b4df55a4e96b650e16798ef06a0 Mon Sep 17 00:00:00 2001
From: cinap_lenrek <cinap_lenrek@localhost>
Date: Tue, 3 May 2011 11:25:13 +0000
Subject: add hg and python

---
 sys/src/cmd/python/Doc/lib/libcrypt.tex | 54 +++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 sys/src/cmd/python/Doc/lib/libcrypt.tex

(limited to 'sys/src/cmd/python/Doc/lib/libcrypt.tex')

diff --git a/sys/src/cmd/python/Doc/lib/libcrypt.tex b/sys/src/cmd/python/Doc/lib/libcrypt.tex
new file mode 100644
index 000000000..b6a14635b
--- /dev/null
+++ b/sys/src/cmd/python/Doc/lib/libcrypt.tex
@@ -0,0 +1,54 @@
+\section{\module{crypt} ---
+         Function to check \UNIX{} passwords}
+
+\declaremodule{builtin}{crypt}
+  \platform{Unix}
+\modulesynopsis{The \cfunction{crypt()} function used to check
+  \UNIX\ passwords.}
+\moduleauthor{Steven D. Majewski}{sdm7g@virginia.edu}
+\sectionauthor{Steven D. Majewski}{sdm7g@virginia.edu}
+\sectionauthor{Peter Funk}{pf@artcom-gmbh.de}
+
+
+This module implements an interface to the
+\manpage{crypt}{3}\index{crypt(3)} routine, which is a one-way hash
+function based upon a modified DES\indexii{cipher}{DES} algorithm; see
+the \UNIX{} man page for further details.  Possible uses include
+allowing Python scripts to accept typed passwords from the user, or
+attempting to crack \UNIX{} passwords with a dictionary.
+
+Notice that the behavior of this module depends on the actual implementation 
+of the \manpage{crypt}{3}\index{crypt(3)} routine in the running system. 
+Therefore, any extensions available on the current implementation will also 
+be available on this module.
+\begin{funcdesc}{crypt}{word, salt} 
+  \var{word} will usually be a user's password as typed at a prompt or 
+  in a graphical interface.  \var{salt} is usually a random
+  two-character string which will be used to perturb the DES algorithm
+  in one of 4096 ways.  The characters in \var{salt} must be in the
+  set \regexp{[./a-zA-Z0-9]}.  Returns the hashed password as a
+  string, which will be composed of characters from the same alphabet
+   as the salt (the first two characters represent the salt itself).
+
+  Since a few \manpage{crypt}{3}\index{crypt(3)} extensions allow different
+  values, with different sizes in the \var{salt}, it is recommended to use 
+  the full crypted password as salt when checking for a password.
+\end{funcdesc}
+
+
+A simple example illustrating typical use:
+
+\begin{verbatim}
+import crypt, getpass, pwd
+
+def login():
+    username = raw_input('Python login:')
+    cryptedpasswd = pwd.getpwnam(username)[1]
+    if cryptedpasswd:
+        if cryptedpasswd == 'x' or cryptedpasswd == '*': 
+            raise "Sorry, currently no support for shadow passwords"
+        cleartext = getpass.getpass()
+        return crypt.crypt(cleartext, cryptedpasswd) == cryptedpasswd
+    else:
+        return 1
+\end{verbatim}
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