chore(app): remove prova-lib

Issue: BG-34381

Author: OttoAllmendinger

app/utils.js

@@ -5,7 +5,6 @@ const binary = require('ripple-binary-codec');
 const nodemailer = require('nodemailer');
 const smtpTransport = require('nodemailer-smtp-transport');
 const jsrender = require('jsrender');
-const prova = require('prova-lib');
 const utxolib = require('@bitgo/utxo-lib');
 const stellar = require('stellar-base');
 const stellarHd = require('stellar-hd-wallet');
@@ -151,7 +150,7 @@ exports.signXrpWithPrivateKey = function(txHex, privateKey, options) {
   if (privateKeyBuffer.length === 33 && privateKeyBuffer[0] === 0) {
     privateKeyBuffer = privateKeyBuffer.slice(1, 33);
   }
-  const privateKeyObject = prova.ECPair.fromPrivateKeyBuffer(privateKeyBuffer);
+  const privateKeyObject = utxolib.bitgo.keyutil.privateKeyBufferToECPair(privateKeyBuffer);
   const publicKey = privateKeyObject.getPublicKeyBuffer().toString('hex').toUpperCase();
 
   let tx;

package.json

@@ -39,7 +39,6 @@
     "nodemailer": "^4.6.7",
     "nodemailer-smtp-transport": "^2.7.4",
     "prompt-sync": "^4.1.6",
-    "prova-lib": "^0.2.9",
     "q": "^1.5.1",
     "ripple-binary-codec": "^0.1.13",
     "ripple-hashes": "^0.3.1",