hashlock

Documentation

Overview

Package hashlock implements token locking.

> A Hashlock is a type of encumbrance that restricts the spending of an output > until a specified piece of data is publicly revealed. Hashlocks have the useful > property that once any hashlock is opened publicly, any other hashlock secured > using the same key can also be opened. This makes it possible to create > multiple outputs that are all encumbered by the same hashlock and which all > become spendable at the same time. Hashlocks have been used independently (see > below) but are most commonly described as part of a system such as Hashed > Timelock Contracts.

https://en.bitcoinwiki.org/wiki/Hashlock

Index

• func PreimageCondition(preimage []byte) weave.Condition
• type Authenticate
  • func (a Authenticate) GetConditions(ctx weave.Context) []weave.Condition
  • func (a Authenticate) HasAddress(ctx weave.Context, addr weave.Address) bool
• type Decorator
  • func NewDecorator() Decorator
  • func (d Decorator) Check(ctx weave.Context, store weave.KVStore, tx weave.Tx, next weave.Checker) (weave.CheckResult, error)
  • func (d Decorator) Deliver(ctx weave.Context, store weave.KVStore, tx weave.Tx, next weave.Deliverer) (weave.DeliverResult, error)
• type HashKeyTx

Functions

func PreimageCondition

func PreimageCondition(preimage []byte) weave.Condition

PreimageCondition calculates a sha256 hash and then

Types

type Authenticate

type Authenticate struct{}

Authenticate implements x.Authenticator and provides authentication based on public-key signatures.

func (Authenticate) GetConditions

func (a Authenticate) GetConditions(ctx weave.Context) []weave.Condition

GetConditions returns which preimages have authorized the current Context. May be nil

func (Authenticate) HasAddress

func (a Authenticate) HasAddress(ctx weave.Context, addr weave.Address) bool

HasAddress returns true if the given address had the preimage permission in the current Context.

type Decorator

type Decorator struct{}

Decorator adds permissions to context based on preimages

func NewDecorator

func NewDecorator() Decorator

NewDecorator returns a default hashlock decorator

func (Decorator) Check

func (d Decorator) Check(ctx weave.Context, store weave.KVStore, tx weave.Tx,
	next weave.Checker) (weave.CheckResult, error)

Check verifies signatures before calling down the stack

func (Decorator) Deliver

func (d Decorator) Deliver(ctx weave.Context, store weave.KVStore, tx weave.Tx,
	next weave.Deliverer) (weave.DeliverResult, error)

Deliver verifies signatures before calling down the stack

type HashKeyTx

type HashKeyTx interface {
	// GetPreimage should return a hash preimage if provided
	// or nil if not included in this tx
	GetPreimage() []byte
}

HashKeyTx is an optional interface for a Tx that allows it to provide Keys (Preimages) to open HashLocks