2 Copyright (C) 2013-2014 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 /** @file src/signer.cc
21 * @brief Signer class.
25 #include "exceptions.h"
26 #include <libcxml/cxml.h>
27 #include <libxml++/libxml++.h>
28 #include <xmlsec/xmldsig.h>
29 #include <xmlsec/dl.h>
30 #include <xmlsec/app.h>
31 #include <xmlsec/crypto.h>
36 using boost::shared_ptr;
39 /** Add a <Signer> and <ds:Signature> nodes to an XML node.
40 * @param parent XML node to add to.
41 * @param interop true to use Interop standards, false for SMPTE.
44 Signer::sign (xmlpp::Element* parent, Standard standard) const
48 xmlpp::Element* signer = parent->add_child("Signer");
49 xmlpp::Element* data = signer->add_child("X509Data", "dsig");
50 xmlpp::Element* serial_element = data->add_child("X509IssuerSerial", "dsig");
51 serial_element->add_child("X509IssuerName", "dsig")->add_child_text (_certificates.leaf()->issuer());
52 serial_element->add_child("X509SerialNumber", "dsig")->add_child_text (_certificates.leaf()->serial());
53 data->add_child("X509SubjectName", "dsig")->add_child_text (_certificates.leaf()->subject());
57 xmlpp::Element* signature = parent->add_child("Signature", "dsig");
59 xmlpp::Element* signed_info = signature->add_child ("SignedInfo", "dsig");
60 signed_info->add_child("CanonicalizationMethod", "dsig")->set_attribute ("Algorithm", "http://www.w3.org/TR/2001/REC-xml-c14n-20010315");
62 if (standard == INTEROP) {
63 signed_info->add_child("SignatureMethod", "dsig")->set_attribute("Algorithm", "http://www.w3.org/2000/09/xmldsig#rsa-sha1");
65 signed_info->add_child("SignatureMethod", "dsig")->set_attribute("Algorithm", "http://www.w3.org/2001/04/xmldsig-more#rsa-sha256");
68 xmlpp::Element* reference = signed_info->add_child("Reference", "dsig");
69 reference->set_attribute ("URI", "");
71 xmlpp::Element* transforms = reference->add_child("Transforms", "dsig");
72 transforms->add_child("Transform", "dsig")->set_attribute (
73 "Algorithm", "http://www.w3.org/2000/09/xmldsig#enveloped-signature"
76 reference->add_child("DigestMethod", "dsig")->set_attribute("Algorithm", "http://www.w3.org/2000/09/xmldsig#sha1");
77 /* This will be filled in by the signing later */
78 reference->add_child("DigestValue", "dsig");
80 signature->add_child("SignatureValue", "dsig");
81 signature->add_child("KeyInfo", "dsig");
82 add_signature_value (signature, "dsig");
88 * @param parent Node to sign.
89 * @param ns Namespace to use for the signature XML nodes.
92 Signer::add_signature_value (xmlpp::Node* parent, string ns) const
94 cxml::Node cp (parent);
95 xmlpp::Node* key_info = cp.node_child("KeyInfo")->node ();
97 /* Add the certificate chain to the KeyInfo child node of parent */
98 list<shared_ptr<Certificate> > c = _certificates.leaf_to_root ();
99 for (list<shared_ptr<Certificate> >::iterator i = c.begin(); i != c.end(); ++i) {
100 xmlpp::Element* data = key_info->add_child("X509Data", ns);
103 xmlpp::Element* serial = data->add_child("X509IssuerSerial", ns);
104 serial->add_child("X509IssuerName", ns)->add_child_text((*i)->issuer ());
105 serial->add_child("X509SerialNumber", ns)->add_child_text((*i)->serial ());
108 data->add_child("X509Certificate", ns)->add_child_text((*i)->certificate());
111 xmlSecDSigCtxPtr signature_context = xmlSecDSigCtxCreate (0);
112 if (signature_context == 0) {
113 throw MiscError ("could not create signature context");
116 signature_context->signKey = xmlSecCryptoAppKeyLoad (_key.string().c_str(), xmlSecKeyDataFormatPem, 0, 0, 0);
117 if (signature_context->signKey == 0) {
118 throw FileError ("could not load private key file", _key, 0);
121 /* XXX: set key name to the file name: is this right? */
122 if (xmlSecKeySetName (signature_context->signKey, reinterpret_cast<const xmlChar *> (_key.c_str())) < 0) {
123 throw MiscError ("could not set key name");
126 if (xmlSecDSigCtxSign (signature_context, parent->cobj ()) < 0) {
127 throw MiscError ("could not sign");
130 xmlSecDSigCtxDestroy (signature_context);