feat(sign-vote): accept WIF and hex private keys

src/utils/sign-vote.js

@@ -1,9 +1,14 @@
 import { crypto } from "bitcoinjs-lib";
+import { ECPairFactory } from "ecpair";
 import { Buffer } from "buffer";
 import { Int64LE } from "int64-buffer";
 import secp256k1 from "secp256k1";
 import { swapEndiannessInPlace, swapEndianness } from "./buffer-math";
+import { syscoinNetworks } from "./networks";
+import * as secp from "@bitcoinerlab/secp256k1";
 
+const ECPair = ECPairFactory(secp);
+
 
 /**
  * This function returns an object that the api must receive to make the vote through the mn, collecting the data for the vote and making the signature
@@ -15,6 +20,10 @@ const signVote = (obj) => {
   // eslint-disable-next-line
   try {
     const { mnPrivateKey, vinMasternode, gObjectHash, voteOutcome } = obj;
+    const network =
+      process.env.REACT_APP_CHAIN_NETWORK === "main"
+        ? syscoinNetworks.mainnet
+        : syscoinNetworks.testnet;
     const time = Math.floor(Date.now() / 1000);
     const gObjectHashBuffer = Buffer.from(gObjectHash, "hex");
     const voteSignalNum = 1; // 'funding'
@@ -45,10 +54,24 @@ const signVote = (obj) => {
     const hash = crypto.hash256(message);
 
     let signObj = null;
-    // mnPrivateKey is expected to be a hex-encoded private key from the descriptor derivation
-    const privateKeyBuffer = Buffer.from(mnPrivateKey, "hex");
+    let privateKeyBuffer;
+    let isCompressed = true;
+    if (/^[0-9a-fA-F]{64}$/.test(mnPrivateKey)) {
+      privateKeyBuffer = Buffer.from(mnPrivateKey, "hex");
+    } else {
+      const keyPair = ECPair.fromWIF(`${mnPrivateKey}`, network);
+      if (!keyPair.privateKey) {
+        throw new Error("mnPrivateKey WIF does not contain a private key");
+      }
+      privateKeyBuffer = Buffer.from(keyPair.privateKey);
+      isCompressed = keyPair.compressed;
+    }
+
+    if (privateKeyBuffer.length !== 32) {
+      throw new Error("mnPrivateKey must be 32 bytes");
+    }
+
     signObj = secp256k1.sign(hash, privateKeyBuffer);
-    const isCompressed = true;
     const recId = 27 + signObj.recovery + (isCompressed ? 4 : 0);
 
     const recIdBuffer = Buffer.allocUnsafe(1);