def pre_signature_part(ident, public_key=None, identifier=None):
"""
If an assertion is to be signed the signature part has to be preset
with which algorithms to be used, this function returns such a
preset part.
:param ident: The identifier of the assertion, so you know which assertion
was signed
:param public_key: The base64 part of a PEM file
:return: A preset signature part
"""
signature_method = ds.SignatureMethod(algorithm=ds.SIG_RSA_SHA1)
canonicalization_method = ds.CanonicalizationMethod(
algorithm=ds.ALG_EXC_C14N)
trans0 = ds.Transform(algorithm=ds.TRANSFORM_ENVELOPED)
trans1 = ds.Transform(algorithm=ds.ALG_EXC_C14N)
transforms = ds.Transforms(transform=[trans0, trans1])
digest_method = ds.DigestMethod(algorithm=ds.DIGEST_SHA1)
reference = ds.Reference(uri="#%s" % ident,
digest_value=ds.DigestValue(),
transforms=transforms,
digest_method=digest_method)
signed_info = ds.SignedInfo(
signature_method=signature_method,
canonicalization_method=canonicalization_method,
reference=reference)
signature = ds.Signature(signed_info=signed_info,
signature_value=ds.SignatureValue())
if identifier:
signature.id = "Signature%d" % identifier
if public_key:
x509_data = ds.X509Data(x509_certificate=[
ds.X509DataType_X509Certificate(text=public_key)
])
key_info = ds.KeyInfo(x509_data=x509_data)
signature.key_info = key_info
return signature
def setup_class(self): self.signature_value = ds.SignatureValue()
def _create_signature(self):
"""Create an object that represents a SAML <Signature>.
This must be filled with algorithms that the signing binary will apply
in order to sign the whole message.
Currently we enforce X509 signing.
Example of the template::
<Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
<SignedInfo>
<CanonicalizationMethod
Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
<SignatureMethod
Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>
<Reference URI="#<Assertion ID>">
<Transforms>
<Transform
Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
<Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
</Transforms>
<DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
<DigestValue />
</Reference>
</SignedInfo>
<SignatureValue />
<KeyInfo>
<X509Data />
</KeyInfo>
</Signature>
:return: XML <Signature> object
"""
canonicalization_method = xmldsig.CanonicalizationMethod()
canonicalization_method.algorithm = xmldsig.ALG_EXC_C14N
signature_method = xmldsig.SignatureMethod(
algorithm=xmldsig.SIG_RSA_SHA1)
transforms = xmldsig.Transforms()
envelope_transform = xmldsig.Transform(
algorithm=xmldsig.TRANSFORM_ENVELOPED)
c14_transform = xmldsig.Transform(algorithm=xmldsig.ALG_EXC_C14N)
transforms.transform = [envelope_transform, c14_transform]
digest_method = xmldsig.DigestMethod(algorithm=xmldsig.DIGEST_SHA1)
digest_value = xmldsig.DigestValue()
reference = xmldsig.Reference()
reference.uri = '#' + self.assertion_id
reference.digest_method = digest_method
reference.digest_value = digest_value
reference.transforms = transforms
signed_info = xmldsig.SignedInfo()
signed_info.canonicalization_method = canonicalization_method
signed_info.signature_method = signature_method
signed_info.reference = reference
key_info = xmldsig.KeyInfo()
key_info.x509_data = xmldsig.X509Data()
signature = xmldsig.Signature()
signature.signed_info = signed_info
signature.signature_value = xmldsig.SignatureValue()
signature.key_info = key_info
return signature