def sign(self, doc, id, keyname):
"""sign element identified by *id* in *doc* (`lxml` etree) with the (first) key with *keyname*."""
from dm.xmlsec.binding import dsig, DSigCtx, findNode, Error
# will fail with ``IndexError`` when the id does not exist
node = doc.xpath('//*[@ID="%s"]' % id)[0]
node = findNode(node, dsig("Signature"))
assert node is not None, "Missing signature element"
sign_ctx = DSigCtx(None)
sign_ctx.signKey = self.__keys_manager[keyname][0]
try: sign_ctx.sign(node)
except Error, e:
raise SignError('signing failed', id, keyname, e)
def sign_binary(self, data, algorithm, keyname):
"""sign *data* with *algorithm* and the (first) key with *keyname*.
*algorithm* is identified by its uri.
"""
from dm.xmlsec.binding import DSigCtx, Error
sign_ctx = DSigCtx()
sign_ctx.signKey = self.__keys_manager[keyname][0]
try:
a = self.resolve_algorithm(algorithm)
return sign_ctx.signBinary(data, a)
except Error, e:
raise SignError('signing failed', algorithm, e)
def sign(self, doc, id, keyname):
"""sign element identified by *id* in *doc* (`lxml` etree) with the (first) key with *keyname*."""
from dm.xmlsec.binding import dsig, DSigCtx, findNode, Error
# will fail with ``IndexError`` when the id does not exist
node = doc.xpath('//*[@ID="%s"]' % id)[0]
node = findNode(node, dsig("Signature"))
assert node is not None, "Missing signature element"
sign_ctx = DSigCtx(None)
sign_ctx.signKey = self.__keys_manager[keyname][0]
try:
sign_ctx.sign(node)
except Error, e:
raise SignError('signing failed', id, keyname, e)
def sign_binary(self, data, algorithm, keyname):
"""sign *data* with *algorithm* and the (first) key with *keyname*.
*algorithm* is identified by its uri.
"""
from dm.xmlsec.binding import DSigCtx, Error
sign_ctx = DSigCtx()
sign_ctx.signKey = self.__keys_manager[keyname][0]
try:
a = self.resolve_algorithm(algorithm)
return sign_ctx.signBinary(data, a)
except Error, e:
raise SignError('signing failed', algorithm, e)
def verify(self, doc, id, keyname):
"""verify the node identified by *id* in *doc* using a key associated with *keyname*.
Raise ``VerifyError``, when the verification fails.
We only allow a single reference. Its uri must either be empty or
refer to the element we are verifying.
In addition, we only allow the standard transforms.
"""
from dm.xmlsec.binding import findNode, dsig, DSigCtx, \
TransformExclC14N, TransformExclC14NWithComments, \
TransformEnveloped, \
VerificationError
node = doc.xpath('//*[@ID="%s"]' % id)
if len(node) != 1:
raise VerifyError('id not unique or not found: %s %d' %
(id, len(nodes)))
node = node[0]
sig = findNode(node, dsig("Signature"))
# verify the reference.
refs = sig.xpath('ds:SignedInfo/ds:Reference', namespaces=dsigns)
if len(refs) != 1:
raise VerifyError('only a single reference is allowed: %d' %
len(refs))
ref = refs[0]
uris = ref.xpath('@URI')
if not uris or uris[0] != '#' + id:
raise VerifyError(
'reference uri does not refer to signature parent', id)
# now verify the signature: try each key in turn
for key in self.__keys_manager.get(keyname, ()):
verify_ctx = DSigCtx(None)
for t in chain((TransformExclC14N, TransformExclC14NWithComments),
config.signature_transforms):
verify_ctx.enableSignatureTransform(t)
for t in chain((TransformExclC14N, TransformExclC14NWithComments,
TransformEnveloped), config.reference_transforms):
verify_ctx.enableReferenceTransform(t)
verify_ctx.signKey = key
try:
verify_ctx.verify(sig)
except VerificationError:
pass
else:
return
raise VerifyError('signature verification failed: %s %s' %
(id, keyname))
def verify_binary(self, data, algorithm, signature, keyname):
"""verify *signature* for *data* with *algorithm* using a key associated with *keyname*.
Raise ``VerifyError``, when the verification fails.
*algorithm* is identified by its uri.
"""
from dm.xmlsec.binding import DSigCtx, Error
a = self.resolve_algorithm(algorithm) # may raise `Error`
# now verify the signature: try each key in turn
for key in self.__keys_manager.get(keyname, ()):
verify_ctx = DSigCtx()
verify_ctx.signKey = key
try: verify_ctx.verifyBinary(data, a, signature)
except VerificationError: pass
else: return
raise VerifyError('signature verification failed: %s' % keyname)
def verify_binary(self, data, algorithm, signature, keyname):
"""verify *signature* for *data* with *algorithm* using a key associated with *keyname*.
Raise ``VerifyError``, when the verification fails.
*algorithm* is identified by its uri.
"""
from dm.xmlsec.binding import DSigCtx, Error
a = self.resolve_algorithm(algorithm) # may raise `Error`
# now verify the signature: try each key in turn
for key in self.__keys_manager.get(keyname, ()):
verify_ctx = DSigCtx()
verify_ctx.signKey = key
try:
verify_ctx.verifyBinary(data, a, signature)
except VerificationError:
pass
else:
return
raise VerifyError('signature verification failed: %s' % keyname)
def verify(self, doc, id, keyname):
"""verify the node identified by *id* in *doc* using a key associated with *keyname*.
Raise ``VerifyError``, when the verification fails.
We only allow a single reference. Its uri must either be empty or
refer to the element we are verifying.
In addition, we only allow the standard transforms.
"""
from dm.xmlsec.binding import findNode, dsig, DSigCtx, \
TransformExclC14N, TransformExclC14NWithComments, \
TransformEnveloped, \
VerificationError
node = doc.xpath('//*[@ID="%s"]' % id)
if len(node) != 1:
raise VerifyError('id not unique or not found: %s %d' % (id, len(nodes)))
node = node[0]
sig = findNode(node, dsig("Signature"))
# verify the reference.
refs = sig.xpath('ds:SignedInfo/ds:Reference', namespaces=dsigns)
if len(refs) != 1:
raise VerifyError('only a single reference is allowed: %d' % len(refs))
ref = refs[0]
uris = ref.xpath('@URI')
if not uris or uris[0] != '#' + id:
raise VerifyError('reference uri does not refer to signature parent', id)
# now verify the signature: try each key in turn
for key in self.__keys_manager.get(keyname, ()):
verify_ctx = DSigCtx(None)
for t in chain((TransformExclC14N, TransformExclC14NWithComments), config.signature_transforms):
verify_ctx.enableSignatureTransform(t)
for t in chain((TransformExclC14N, TransformExclC14NWithComments, TransformEnveloped), config.reference_transforms):
verify_ctx.enableReferenceTransform(t)
verify_ctx.signKey = key
try: verify_ctx.verify(sig)
except VerificationError: pass
else: return
raise VerifyError('signature verification failed: %s %s' % (id, keyname))