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add and use constant time 32 byte equality function

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moneromooo-monero 2018-06-13 18:23:06 +01:00
parent 510dbf3329
commit d2e26c23f3
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9 changed files with 130 additions and 14 deletions
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28
src/crypto/generic-ops.h
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@ -33,19 +33,30 @@
#include <cstddef>
#include <cstring>
#include <functional>
#include <sodium/crypto_verify_32.h>
#define CRYPTO_MAKE_COMPARABLE(type) \
namespace crypto { \
inline bool operator==(const type &_v1, const type &_v2) { \
return std::memcmp(&_v1, &_v2, sizeof(type)) == 0; \
return !memcmp(&_v1, &_v2, sizeof(_v1)); \
} \
inline bool operator!=(const type &_v1, const type &_v2) { \
return std::memcmp(&_v1, &_v2, sizeof(type)) != 0; \
return !operator==(_v1, _v2); \
} \
}
#define CRYPTO_MAKE_HASHABLE(type) \
CRYPTO_MAKE_COMPARABLE(type) \
#define CRYPTO_MAKE_COMPARABLE_CONSTANT_TIME(type) \
namespace crypto { \
inline bool operator==(const type &_v1, const type &_v2) { \
static_assert(sizeof(_v1) == 32, "constant time comparison is only implenmted for 32 bytes"); \
return crypto_verify_32((const unsigned char*)&_v1, (const unsigned char*)&_v2) == 0; \
} \
inline bool operator!=(const type &_v1, const type &_v2) { \
return !operator==(_v1, _v2); \
} \
}
#define CRYPTO_DEFINE_HASH_FUNCTIONS(type) \
namespace crypto { \
static_assert(sizeof(std::size_t) <= sizeof(type), "Size of " #type " must be at least that of size_t"); \
inline std::size_t hash_value(const type &_v) { \
@ -60,3 +71,12 @@ namespace std { \
} \
}; \
}
#define CRYPTO_MAKE_HASHABLE(type) \
CRYPTO_MAKE_COMPARABLE(type) \
CRYPTO_DEFINE_HASH_FUNCTIONS(type)
#define CRYPTO_MAKE_HASHABLE_CONSTANT_TIME(type) \
CRYPTO_MAKE_COMPARABLE_CONSTANT_TIME(type) \
CRYPTO_DEFINE_HASH_FUNCTIONS(type)