hashcash

Documentation

Overview

Package hashcash implements the hashcash algorithm.

Index

• Constants
• Variables
• func BitCount(d [32]byte) byte
• func ComputeNonce(d []byte, bits byte, c, stop uint64) (nonce []byte, ok bool)
• func ComputeNonceParallel(d []byte, bits byte, start, stop uint64) (nonce []byte, ok bool)
• func ComputeNonceSelect(d []byte, bits byte, start, stop uint64) (nonce []byte, ok bool)
• func NonceToUInt64(nonce []byte) uint64
• func TestNonce(d, nonce []byte, bits byte) (bool, byte)

Constants

const NonceSize = 8

NonceSize is the size of a hashcash nonce.

const Version = "0.0.1 very alpha"

Version of this release.

Variables

var (
	// Steps is the number of steps per thread per cycle.
	Steps = uint64(4194304)
	// SingleThreadBits Number of bits required for parallel computing.
	SingleThreadBits = byte(20)
)

Functions

func BitCount

func BitCount(d [32]byte) byte

BitCount counts leading zero bits in d and returns them.

func ComputeNonce

func ComputeNonce(d []byte, bits byte, c, stop uint64) (nonce []byte, ok bool)

ComputeNonce is the hashcash algorithm. c is the start value for calculation, stop is the end value. Both can be 0 to ignore segemented calculations.

func ComputeNonceParallel

func ComputeNonceParallel(d []byte, bits byte, start, stop uint64) (nonce []byte, ok bool)

ComputeNonceParallel computes hashcash in parallel.

func ComputeNonceSelect

func ComputeNonceSelect(d []byte, bits byte, start, stop uint64) (nonce []byte, ok bool)

ComputeNonceSelect calls parallel or single compute depending on bits.

func NonceToUInt64

func NonceToUInt64(nonce []byte) uint64

NonceToUInt64 converts a nonce back to uint64

func TestNonce

func TestNonce(d, nonce []byte, bits byte) (bool, byte)

TestNonce verifies that a given nonce generates bits zero bits on d when hashed.