Voucher generation & claim

voucher-gen-claim.mjs

import {
  // generate,
  derive
} from 'xrpl-accountlib'

import rippleAddressCodec from 'ripple-address-codec'

import {
  sign,
  verify
} from 'ripple-keypairs'

// const { address, secret: { familySeed }, keypair: { publicKey, privateKey }, } = generate.familySeed({ algorithm: 'ed25519' })

/**
 * This is th evoucher
 */

const Voucher = {
  privateKey: 'EDE43F4051BA986482CB9236D00C323C4E9BB92BF83750B4F93B77D5F90CDDE193', // The secret key (family seed) is the actual voucher
  publicKey: null
}

const derived = derive.privatekey(Voucher.privateKey)
Voucher.publicKey = Buffer.from(derived.keypair.publicKey, 'hex')
//        ^^        Voucher pubkey / or hash thereof is the KEY for the Hook Store that tracks the balance that can be claimed

// Voucher claim balance is stored as Hook State under publicKey / pubkey hash

/**
 * This is the Invoke as generated
 */

const InvokeTx = {
  TransactionType: 'Invoke',
  Account: 'rwietsevLFg8XSmG3bEZzFein1g8RBqWDZ',
  Blob: null,
}

const accountId = rippleAddressCodec.decodeAccountID(InvokeTx.Account)
const payload = Buffer.concat([ Voucher.publicKey, accountId ])
const signature = Buffer.from(sign(payload.toString('hex'), Voucher.privateKey), 'hex')

const Blob = Buffer.concat([ signature, payload ]).toString('hex')
//  
//  [   - 64 signature -   ] [   - 33 voucher pubkey -   ] [   - 20 destination account id -   ]
//  

Object.assign(InvokeTx, { Blob, })
console.log(InvokeTx)

/**
 * Now verify the signature
 *  ---> THIS IS WHAT NEEDS TO HAPPEN IN THE HOOK!
 */

const verifyBlob = Buffer.from(InvokeTx.Blob, 'hex')

const verifyData = verifyBlob.slice(64).toString('hex')
const verifySignature = verifyBlob.slice(0, 64).toString('hex')
const verifyVoucherPubkey = verifyBlob.slice(64, -20).toString('hex')

const verificationVerifies = verify(verifyData, verifySignature, verifyVoucherPubkey)

const sendToAccount = rippleAddressCodec.encodeAccountID(verifyBlob.slice(-20))

console.log({
  verifyData,
  verifySignature,
  verifyVoucherPubkey,
  verificationVerifies,
  sendToAccount,
})

Example output:

{
  TransactionType: 'Invoke',
  Account: 'rwietsevLFg8XSmG3bEZzFein1g8RBqWDZ',
  Blob: 'bbfe12add101913ae0e2fa3611984ce733ea79cbd5c117d9b60174c8dad8f7b0d98ff296b6969968df811a7c62fe1f39ce40c54e64615f5d06f671daf6537604eda18c3d29df5cf5fbb7227198632c91592f7f7661f4159191c538403b83760a886c1d22888cf2cc88579d71fe0be6890fe2268bf3'
}

{
  verifyData: 'eda18c3d29df5cf5fbb7227198632c91592f7f7661f4159191c538403b83760a886c1d22888cf2cc88579d71fe0be6890fe2268bf3',
  verifySignature: 'bbfe12add101913ae0e2fa3611984ce733ea79cbd5c117d9b60174c8dad8f7b0d98ff296b6969968df811a7c62fe1f39ce40c54e64615f5d06f671daf6537604',
  verifyVoucherPubkey: 'eda18c3d29df5cf5fbb7227198632c91592f7f7661f4159191c538403b83760a88',
  verificationVerifies: true,
  sendToAccount: 'rwietsevLFg8XSmG3bEZzFein1g8RBqWDZ'
}