constants.go

package prekeyserver

import (
	"errors"
	"math/big"

	"github.com/otrv4/ed448"
)

const (
	version = uint16(4)
)

const fragmentationPrefix = "?OTRP|"

const symKeyLength = 57
const privKeyLength = 57
const fingerprintLength = 56
const skLength = 64

const (
	usageFingerprint                      = 0x00
	usageSK                               = 0x01
	usageInitiatorClientProfile           = 0x02
	usageInitiatorPrekeyCompositeIdentity = 0x03
	usageInitiatorPrekeyCompositePHI      = 0x04
	usageReceiverClientProfile            = 0x05
	usageReceiverPrekeyCompositeIdentity  = 0x06
	usageReceiverPrekeyCompositePHI       = 0x07
	usagePreMACKey                        = 0x08
	usagePreMAC                           = 0x09
	usageStorageInfoMAC                   = 0x0A
	usageStatusMAC                        = 0x0B
	usageSuccessMAC                       = 0x0C
	usageFailureMAC                       = 0x0D
	usagePrekeyMessage                    = 0x0E
	usageClientProfile                    = 0x0F
	usagePrekeyProfile                    = 0x10
	usageAuth                             = 0x11
	usageProofContext                     = 0x12
	usageProofMessageEcdh                 = 0x13
	usageProofMessageDh                   = 0x14
	usageProofSharedEcdh                  = 0x15
	usageMacProofs                        = 0x16
	usageProofCLambda                     = 0x17
)

const macLength = 64

const (
	messageTypeDAKE1                     = uint8(0x35)
	messageTypeDAKE2                     = uint8(0x36)
	messageTypeDAKE3                     = uint8(0x37)
	messageTypePublication               = uint8(0x08)
	messageTypeStorageInformationRequest = uint8(0x09)
	messageTypeStorageStatusMessage      = uint8(0x0B)
	messageTypeSuccess                   = uint8(0x06)
	messageTypeFailure                   = uint8(0x05)
	messageTypeEnsembleRetrievalQuery    = uint8(0x10)
	messageTypeEnsembleRetrieval         = uint8(0x13)
	messageTypeNoPrekeyEnsembles         = uint8(0x0E)
	messageTypePrekeyMessage             = uint8(0x0F)
)

const noPrekeyMessagesAvailableMessage = "No Prekey Messages available for this identity"

const indexOfMessageType = 2

var identityPoint = ed448.NewPoint([16]uint32{0x00}, [16]uint32{0x01}, [16]uint32{0x01}, [16]uint32{0x00})

var errShortRandomRead = errors.New("short read from random source")

var (
	scalarZero     ed448.Scalar
	scalarOne      ed448.Scalar
	scalarMinusOne ed448.Scalar
	bigOne         *big.Int
)

func init() {
	zeroBuf := [56]byte{0x00}
	oneBuf := [56]byte{0x01}
	scalarZero = ed448.NewScalar(zeroBuf[:])
	scalarOne = ed448.NewScalar(oneBuf[:])
	scalarMinusOne = scalarZero.Copy()
	scalarMinusOne.Sub(scalarZero, scalarOne)
	bigOne = big.NewInt(1)
}