safe-bag.cpp
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1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2 /*
3  * Copyright (c) 2013-2017 Regents of the University of California.
4  *
5  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
6  *
7  * ndn-cxx library is free software: you can redistribute it and/or modify it under the
8  * terms of the GNU Lesser General Public License as published by the Free Software
9  * Foundation, either version 3 of the License, or (at your option) any later version.
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11  * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
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13  * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
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15  * You should have received copies of the GNU General Public License and GNU Lesser
16  * General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
17  * <http://www.gnu.org/licenses/>.
18  *
19  * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
20  *
21  * @author Zhiyi Zhang <dreamerbarrychang@gmail.com>
22  */
23 
24 #include "safe-bag.hpp"
27 #include "util/concepts.hpp"
28 
29 namespace ndn {
30 namespace security {
31 
32 BOOST_CONCEPT_ASSERT((WireEncodable<SafeBag>));
33 BOOST_CONCEPT_ASSERT((WireDecodable<SafeBag>));
34 
35 SafeBag::SafeBag() = default;
36 
37 SafeBag::SafeBag(const Block& wire)
38 {
39  this->wireDecode(wire);
40 }
41 
42 SafeBag::SafeBag(const Data& certificate,
43  const Buffer& encryptedKeyBag)
44  : m_certificate(certificate)
45  , m_encryptedKeyBag(encryptedKeyBag)
46 {
47 }
48 
49 SafeBag::SafeBag(const Data& certificate,
50  const uint8_t* encryptedKey,
51  size_t encryptedKeyLen)
52  : m_certificate(certificate)
53  , m_encryptedKeyBag(encryptedKey, encryptedKeyLen)
54 {
55 }
56 
58 
59 template<encoding::Tag TAG>
60 size_t
61 SafeBag::wireEncode(EncodingImpl<TAG>& encoder) const
62 {
63  size_t totalLength = 0;
64 
65  // EncryptedKeyBag
66  totalLength += encoder.prependByteArrayBlock(tlv::security::EncryptedKeyBag,
67  m_encryptedKeyBag.data(),
68  m_encryptedKeyBag.size());
69 
70  // Certificate
71  totalLength += this->m_certificate.wireEncode(encoder);
72 
73  totalLength += encoder.prependVarNumber(totalLength);
74  totalLength += encoder.prependVarNumber(tlv::security::SafeBag);
75 
76  return totalLength;
77 }
78 
80 
81 const Block&
83 {
84  EncodingEstimator estimator;
85  size_t estimatedSize = wireEncode(estimator);
86 
87  EncodingBuffer buffer(estimatedSize, 0);
88  wireEncode(buffer);
89 
90  this->m_wire = buffer.block();
91  return m_wire;
92 }
93 
94 void
96 {
97  if (wire.type() != tlv::security::SafeBag)
98  BOOST_THROW_EXCEPTION(tlv::Error("Unexpected TLV type when decoding safebag"));
99 
100  this->m_wire = wire;
101  m_wire.parse();
102 
104 
105  // Certificate must be the first part
106  if (it != m_wire.elements_end()) {
107  this->m_certificate.wireDecode(*it);
108  it++;
109  }
110  else
111  BOOST_THROW_EXCEPTION(tlv::Error("Unexpected TLV structure when decoding certificate"));
112 
113  // EncryptedKeyBag
114  if (it != m_wire.elements_end() && it->type() == tlv::security::EncryptedKeyBag) {
115  this->m_encryptedKeyBag = Buffer(it->value(), it->value_size());
116  it++;
117  }
118  else
119  BOOST_THROW_EXCEPTION(tlv::Error("Unexpected TLV structure when decoding encryptedkeybag"));
120 
121  // Check if end
122  if (it != m_wire.elements_end())
123  BOOST_THROW_EXCEPTION(tlv::Error("Unexpected TLV structure after decoding the block"));
124 }
125 
126 } // namespace security
127 } // namespace ndn
Copyright (c) 2013-2017 Regents of the University of California.
Definition: common.hpp:66
void wireDecode(const Block &wire)
Decode from the wire format.
Definition: data.cpp:122
SafeBag()
Create a new empty SafeBag object.
element_container::const_iterator element_const_iterator
Definition: block.hpp:47
Represents a TLV element of NDN packet format.
Definition: block.hpp:42
BOOST_CONCEPT_ASSERT((WireEncodable< SafeBag >))
size_t wireEncode(EncodingImpl< TAG > &encoder, bool wantUnsignedPortionOnly=false) const
Fast encoding or block size estimation.
Definition: data.cpp:48
void wireDecode(const Block &wire)
Decode the input from wire format.
Definition: safe-bag.cpp:95
#define NDN_CXX_DEFINE_WIRE_ENCODE_INSTANTIATIONS(ClassName)
void parse() const
Parse TLV-VALUE into sub elements.
Definition: block.cpp:334
uint32_t type() const
Get TLV-TYPE.
Definition: block.hpp:235
a secured container for sensitive information(certificate, private key)
Definition: safe-bag.hpp:37
const Block & wireEncode() const
Encode to a wire format.
Definition: safe-bag.cpp:82
element_const_iterator elements_end() const
Equivalent to elements().end()
Definition: block.hpp:363
element_const_iterator elements_begin() const
Equivalent to elements().begin()
Definition: block.hpp:355
Represents a Data packet.
Definition: data.hpp:35
General-purpose automatically managed/resized buffer.
Definition: buffer.hpp:40
EncodingImpl< EncoderTag > EncodingBuffer
represents an error in TLV encoding or decoding
EncodingImpl< EstimatorTag > EncodingEstimator