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verify1.py
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verify1.py
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#!/usr/bin/env python
#
# $Id$
#
# PyXMLSec example: Verifying a file using a single key.
#
# Verifies a file using a key from PEM file.
#
# Usage:
# ./verify1.py <signed-file> <pem-key>
#
# Example:
# ./verify1.py sign1-res.xml rsapub.pem
# ./verify1.py sign2-res.xml rsapub.pem
#
# 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, os
sys.path.insert(0, '../')
import libxml2
import xmlsec
def main():
assert(sys.argv)
if len(sys.argv) < 3:
print "Error: wrong number of arguments."
print "Usage: %s <xml-file> <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 = verify_file(sys.argv[1], sys.argv[2])
# Shutdown xmlsec-crypto library
xmlsec.cryptoShutdown()
# Shutdown crypto library
xmlsec.cryptoAppShutdown()
# Shutdown xmlsec library
xmlsec.shutdown()
# Shutdown LibXML2
libxml2.cleanupParser()
sys.exit(res)
# Verifies XML signature in xml_file using public key from key_file.
# Returns 0 on success or a negative value if an error occurs.
def verify_file(xml_file, key_file):
assert(xml_file)
assert(key_file)
# Load XML file
if not check_filename(xml_file):
return -1
doc = libxml2.parseFile(xml_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.NodeSignature, xmlsec.DSigNs)
# Create signature context, we don't need keys manager in this example
dsig_ctx = xmlsec.DSigCtx()
if dsig_ctx is None:
print "Error: failed to create signature context"
return cleanup(doc)
# Load private key, assuming that there is not password
key = xmlsec.cryptoAppKeyLoad(key_file, xmlsec.KeyDataFormatPem,
None, None, None)
if key is None:
print "Error: failed to load private pem key from \"%s\"" % key_file
return cleanup(doc, dsig_ctx)
dsig_ctx.signKey = key
# Set key name to the file name, this is just an example!
if not check_filename(key_file):
return cleanup(doc, dsig_ctx)
if key.setName(key_file) < 0:
print "Error: failed to set key name for key from \"%s\"" % key_file
return cleanup(doc, dsig_ctx)
# Verify signature
if dsig_ctx.verify(node) < 0:
print "Error: signature verify"
return cleanup(doc, dsig_ctx)
# Print verification result to stdout
if dsig_ctx.status == xmlsec.DSigStatusSucceeded:
print "Signature is OK"
else:
print "Signature is INVALID"
# Success
return cleanup(doc, dsig_ctx, 1)
def cleanup(doc=None, dsig_ctx=None, res=-1):
if dsig_ctx is not None:
dsig_ctx.destroy()
if doc is not None:
doc.freeDoc()
return res
def check_filename(filename):
if os.access(filename, os.R_OK):
return 1
else:
print "Error: XML file \"%s\" not found OR no read access" % filename
return 0
if __name__ == "__main__":
main()