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encrypt1.py
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encrypt1.py
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#!/usr/bin/env python
#
# $Id$
#
# PyXMLSec example: Encrypting data using a template file.
#
# Encrypts binary data using a template file and a DES key from a binary file
#
# Usage:
# ./encrypt1.py <xml-tmpl> <des-key-file>
#
# Example:
# ./encrypt1.py encrypt1-tmpl.xml deskey.bin > encrypt1-res.xml
#
# The result could be decrypted with decrypt1 example:
# ./decrypt1.py encrypt1-res.xml deskey.bin
#
# This is free software; see COPYING file in the source
# distribution for preciese wording.
#
# Copyright (C) 2003-2013 Valery Febvre <vfebvre@easter-eggs.com>
#
import sys
sys.path.insert(0, '../')
import libxml2
import xmlsec
def main():
secret_data = "Big secret"
assert(sys.argv)
if len(sys.argv) < 3:
print "Error: wrong number of arguments."
print "Usage: %s <xml-tmpl> <des-key-file>" % sys.argv[0]
return sys.exit(1)
# Init libxml library
libxml2.initParser()
libxml2.substituteEntitiesDefault(1)
# Init xmlsec library
if xmlsec.init() < 0:
print "Error: xmlsec initialization failed."
return sys.exit(-1)
# Check loaded library version
if xmlsec.checkVersion() != 1:
print "Error: loaded xmlsec library version is not compatible.\n"
sys.exit(-1)
# Init crypto library
if xmlsec.cryptoAppInit(None) < 0:
print "Error: crypto initialization failed."
# Init xmlsec-crypto library
if xmlsec.cryptoInit() < 0:
print "Error: xmlsec-crypto initialization failed."
res = encrypt_file(sys.argv[1], sys.argv[2], secret_data, len(secret_data))
# Shutdown xmlsec-crypto library
xmlsec.cryptoShutdown()
# Shutdown crypto library
xmlsec.cryptoAppShutdown()
# Shutdown xmlsec library
xmlsec.shutdown()
# Shutdown LibXML2
libxml2.cleanupParser()
sys.exit(res)
# Encrypts binary #data using template from tmpl_file and DES key from key_file.
# Returns 0 on success or a negative value if an error occurs.
def encrypt_file(tmpl_file, key_file, data, dataSize):
assert(tmpl_file)
assert(key_file)
assert(data)
# Load template
doc = libxml2.parseFile(tmpl_file)
if doc is None or doc.getRootElement() is None:
print "Error: unable to parse file \"%s\"" % tmpl_file
return cleanup(doc)
# Find start node
node = xmlsec.findNode(doc.getRootElement(), xmlsec.NodeEncryptedData,
xmlsec.EncNs)
if node is None:
print "Error: start node not found in \"%s\"" % tmpl_file
return cleanup(doc)
# Create encryption context, we don't need keys manager in this example
enc_ctx = xmlsec.EncCtx(None)
if enc_ctx is None:
print "Error: failed to create encryption context"
return cleanup(doc)
# Load DES key, assuming that there is not password
key = xmlsec.keyReadBinaryFile(xmlsec.keyDataDesId(), key_file)
if key is None:
print "Error failed to load DES key from binary file \"%s\"" % key_file
return cleanup(doc, enc_ctx)
# Set key name to the file name, this is just an example!
if key.setName(key_file) < 0:
print "Error: failed to set key name for key from \"%s\"" % key_file
return cleanup(doc, enc_ctx)
enc_ctx.encKey = key
# Encrypt the data
if enc_ctx.binaryEncrypt(node, data, dataSize) < 0:
print "Error: encryption failed"
return cleanup(doc, enc_ctx)
doc.dump("-")
# Success
return cleanup(doc, enc_ctx, 1)
def cleanup(doc=None, enc_ctx=None, res=-1):
if enc_ctx is not None:
enc_ctx.destroy()
if doc is not None:
doc.freeDoc()
return res
if __name__ == "__main__":
main()