JPAKE

This library allows 2 parties to generate a mutual secret key using a weak key that is known to each other beforehand. This provides a simple API over an implementation of Password Authenticated Key Exchange by Juggling (J-PAKE) based on elliptic curves (currently secp2561k).

This protocol is derived from the J-PAKE paper and relevant RFC. This is a companion project to the javascript version, and all messages are interchangeable between the 2 libraries.

Install

go get github.com/choonkiatlee/jpake-go

Quick Start

func main() {

	// initialise a curve to use.
	secret := "weaksecret"

	jpA, err := jpake.Init(secret)
	panicOnErr(err)
	jpB, err := jpake.Init(secret)
	panicOnErr(err)

	msgA1, err := jpA.GetRound1Message()
	panicOnErr(err)
	msgB1, err := jpB.GetRound1Message()
	panicOnErr(err)

	msgA2, err := jpA.GetRound2Message(msgB1)
	panicOnErr(err)
	msgB2, err := jpB.GetRound2Message(msgA1)
	panicOnErr(err)

	sharedKeyA, err := jpA.ComputeSharedKey(msgB2)
	panicOnErr(err)
	sharedKeyB, err := jpB.ComputeSharedKey(msgA2)
	panicOnErr(err)

	fmt.Println("\nShared Keys Generated: ")
	fmt.Println("\nAlice key: ", sharedKeyA)
	fmt.Println("Bob key: ", sharedKeyB)
}

func panicOnErr(err){
    if err != nil {
        panic(err)
    }
}

JPAKE theory

• Explanation to come

Implementation Notes:

• This currently uses Javascript BigInts.