Optimized SipHash-2-4 implementation for uint256. More...

#include <siphash.h>

Collaboration diagram for PresaltedSipHasher:

Public Member Functions
	PresaltedSipHasher (uint64_t k0, uint64_t k1) noexcept

uint64_t	operator() (const uint256 &val) const noexcept
	Equivalent to CSipHasher(k0, k1).Write(val).Finalize(). More...

uint64_t	operator() (const uint256 &val, uint32_t extra) const noexcept
	Equivalent to CSipHasher(k0, k1).Write(val).Write(extra).Finalize(), with `extra` encoded as 4 little-endian bytes. More...

Private Attributes
const SipHashState	m_state

Detailed Description

Optimized SipHash-2-4 implementation for uint256.

This class caches the initial SipHash v[0..3] state derived from (k0, k1) and implements a specialized hashing path for uint256 values, with or without an extra 32-bit word. The internal state is immutable, so PresaltedSipHasher instances can be reused for multiple hashes with the same key.

Definition at line 55 of file siphash.h.

Constructor & Destructor Documentation

◆ PresaltedSipHasher()

PresaltedSipHasher::PresaltedSipHasher	(	uint64_t	k0,
		uint64_t	k1
	)

inlineexplicitnoexcept

Definition at line 60 of file siphash.h.

Member Function Documentation

◆ operator()() [1/2]

uint64_t PresaltedSipHasher::operator() ( const uint256 & val ) const

noexcept

Equivalent to CSipHasher(k0, k1).Write(val).Finalize().

Definition at line 91 of file siphash.cpp.

◆ operator()() [2/2]

uint64_t PresaltedSipHasher::operator()	(	const uint256 &	val,
		uint32_t	extra
	)		const

noexcept

Equivalent to CSipHasher(k0, k1).Write(val).Write(extra).Finalize(), with extra encoded as 4 little-endian bytes.

Specialized implementation for efficiency.

Definition at line 128 of file siphash.cpp.

Member Data Documentation

◆ m_state

const SipHashState PresaltedSipHasher::m_state

private

Definition at line 57 of file siphash.h.

The documentation for this class was generated from the following files:

src/crypto/siphash.h
src/crypto/siphash.cpp

Public Member Functions

Private Attributes