Electroneum
generic-ops.h
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30 // Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
31 
32 #pragma once
33 
34 #include <cstddef>
35 #include <cstring>
36 #include <functional>
38 
39 #define CRYPTO_MAKE_COMPARABLE(type) \
40 namespace crypto { \
41  inline bool operator==(const type &_v1, const type &_v2) { \
42  return !memcmp(&_v1, &_v2, sizeof(_v1)); \
43  } \
44  inline bool operator!=(const type &_v1, const type &_v2) { \
45  return !operator==(_v1, _v2); \
46  } \
47 }
48 
49 #define CRYPTO_MAKE_COMPARABLE_CONSTANT_TIME(type) \
50 namespace crypto { \
51  inline bool operator==(const type &_v1, const type &_v2) { \
52  static_assert(sizeof(_v1) == 32, "constant time comparison is only implenmted for 32 bytes"); \
53  return crypto_verify_32((const unsigned char*)&_v1, (const unsigned char*)&_v2) == 0; \
54  } \
55  inline bool operator!=(const type &_v1, const type &_v2) { \
56  return !operator==(_v1, _v2); \
57  } \
58 }
59 
60 #define CRYPTO_DEFINE_HASH_FUNCTIONS(type) \
61 namespace crypto { \
62  static_assert(sizeof(std::size_t) <= sizeof(type), "Size of " #type " must be at least that of size_t"); \
63  inline std::size_t hash_value(const type &_v) { \
64  return reinterpret_cast<const std::size_t &>(_v); \
65  } \
66 } \
67 namespace std { \
68  template<> \
69  struct hash<crypto::type> { \
70  std::size_t operator()(const crypto::type &_v) const { \
71  return reinterpret_cast<const std::size_t &>(_v); \
72  } \
73  }; \
74 }
75 
76 #define CRYPTO_MAKE_HASHABLE(type) \
77 CRYPTO_MAKE_COMPARABLE(type) \
78 CRYPTO_DEFINE_HASH_FUNCTIONS(type)
79 
80 #define CRYPTO_MAKE_HASHABLE_CONSTANT_TIME(type) \
81 CRYPTO_MAKE_COMPARABLE_CONSTANT_TIME(type) \
82 CRYPTO_DEFINE_HASH_FUNCTIONS(type)
83