cryptonight

Documentation

Index

• Constants
• func Algo() []string
• func TestSum(variant string) bool
• type CryptoNight
  • func NewCryptoNight() *CryptoNight
  • func (cn *CryptoNight) Sum(data []byte, variant string, height uint64) []byte
• type V4_Instruction

Constants

const (
	// Generate code with minimal theoretical latency = 45 cycles, which is equivalent to 15 multiplications
	TOTAL_LATENCY = 15 * 3

	// Always generate at least 60 instructions
	NUM_INSTRUCTIONS_MIN = 60

	// Never generate more than 70 instructions (final RET instruction doesn't count here)
	NUM_INSTRUCTIONS_MAX = 70

	// Available ALUs for MUL
	// Modern CPUs typically have only 1 ALU which can do multiplications
	ALU_COUNT_MUL = 1

	// Total available ALUs
	// Modern CPUs have 4 ALUs, but we use only 3 because random math executes together with other main loop code
	ALU_COUNT = 3
)

const (
	MUL                  = iota // a*b
	ADD                         // a+b + C, C is an unsigned 32-bit constant
	SUB                         // a-b
	ROR                         // rotate right "a" by "b & 31" bits
	ROL                         // rotate left "a" by "b & 31" bits
	XOR                         // a^b
	RET                         // finish execution
	V4_INSTRUCTION_COUNT = RET
)

const (
	V4_OPCODE_BITS    = 3
	V4_DST_INDEX_BITS = 2
	V4_SRC_INDEX_BITS = 3
)

const REG_BITS = 32

Functions

func Algo

func Algo() []string

func TestSum

func TestSum(variant string) bool

Types

type CryptoNight

type CryptoNight struct {
	// contains filtered or unexported fields
}

func NewCryptoNight

func NewCryptoNight() *CryptoNight

func (*CryptoNight) Sum

func (cn *CryptoNight) Sum(data []byte, variant string, height uint64) []byte

Sum calculate a CryptoNight hash digest. The return value is exactly 32 bytes long.

When variant is 1, data is required to have at least 43 bytes. This is assumed and not checked by Sum. If this condition doesn't meet, Sum will panic straightforward.

type V4_Instruction

type V4_Instruction struct {
	C uint32
	// contains filtered or unexported fields
}