sha256.hpp
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21 
22 #ifndef NDN_UTIL_SHA256_HPP
23 #define NDN_UTIL_SHA256_HPP
24 
25 #include "ndn-cxx/encoding/block.hpp"
26 #include "ndn-cxx/encoding/buffer-stream.hpp"
27 #include "ndn-cxx/security/transform/step-source.hpp"
28 
29 namespace ndn {
30 namespace util {
31 
44 class Sha256
45 {
46 public:
47  class Error : public std::runtime_error
48  {
49  public:
50  using std::runtime_error::runtime_error;
51  };
52 
56  static const size_t DIGEST_SIZE = 32;
57 
61  Sha256();
62 
66  explicit
67  Sha256(std::istream& is);
68 
74  bool
75  empty() const
76  {
77  return m_isEmpty;
78  }
79 
83  void
84  reset();
85 
89  ConstBufferPtr
90  computeDigest();
91 
96  bool
97  operator==(Sha256& digest);
98 
103  bool
104  operator!=(Sha256& digest)
105  {
106  return !(*this == digest);
107  }
108 
118  Sha256&
119  operator<<(Sha256& src);
120 
125  Sha256&
126  operator<<(const std::string& str);
127 
132  Sha256&
133  operator<<(const Block& block);
134 
139  Sha256&
140  operator<<(uint64_t value);
141 
148  void
149  update(const uint8_t* buffer, size_t size);
150 
155  std::string
156  toString();
157 
164  static ConstBufferPtr
165  computeDigest(const uint8_t* buffer, size_t size);
166 
167 private:
168  unique_ptr<security::transform::StepSource> m_input;
169  unique_ptr<OBufferStream> m_output;
170  bool m_isEmpty;
171  bool m_isFinalized;
172 };
173 
174 std::ostream&
175 operator<<(std::ostream& os, Sha256& digest);
176 
177 } // namespace util
178 } // namespace ndn
179 
180 #endif // NDN_UTIL_SHA256_HPP
ndn
Definition: data.cpp:26
ndn::util::Sha256
Provides stateful SHA-256 digest calculation.
Definition: sha256.hpp:44
ndn::util::Sha256::DIGEST_SIZE
static const size_t DIGEST_SIZE
Length in bytes of a SHA-256 digest.
Definition: sha256.hpp:56
ndn::util::Sha256::operator==
bool operator==(Sha256 &digest)
Check if the supplied digest is equal to this digest.
Definition: sha256.cpp:75
ndn::Block
Represents a TLV element of NDN packet format.
Definition: block.hpp:42
ndn::util::Sha256::toString
std::string toString()
Convert digest to std::string.
Definition: sha256.cpp:129
ndn::util::Sha256::Sha256
Sha256()
Create an empty SHA-256 digest.
Definition: sha256.cpp:34
ndn::util::Sha256::update
void update(const uint8_t *buffer, size_t size)
Add a raw buffer to the digest calculation.
Definition: sha256.cpp:118
ndn::util::Sha256::operator!=
bool operator!=(Sha256 &digest)
Check if the supplied digest is not equal to this digest.
Definition: sha256.hpp:104
ndn::util::Sha256::reset
void reset()
Discard the current state and start a new digest calculation.
Definition: sha256.cpp:50
ndn::util::Sha256::computeDigest
ConstBufferPtr computeDigest()
Finalize and return the digest based on all previously supplied inputs.
Definition: sha256.cpp:63
ndn::util::Sha256::operator<<
Sha256 & operator<<(Sha256 &src)
Add existing digest to the digest calculation.
Definition: sha256.cpp:89
ndn::util::Sha256::empty
bool empty() const
Check if digest is empty.
Definition: sha256.hpp:75
ndn::ConstBufferPtr
shared_ptr< const Buffer > ConstBufferPtr
Definition: buffer.hpp:126