From 01056843005a12adaaa8f62d5b02b572fc84ce1d Mon Sep 17 00:00:00 2001
From: vsenkiv <viktor.senkiv-ext@ledger.fr>
Date: Tue, 11 Oct 2022 14:48:48 +0300
Subject: [PATCH] taproot address support implemented

---
 package.json                    |  1 +
 src/actions/deriveAddresses.ts  | 26 +++++++++++++++++++++++++-
 src/configuration/currencies.ts |  2 ++
 3 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/package.json b/package.json
index a777706..fcd1341 100644
--- a/package.json
+++ b/package.json
@@ -43,6 +43,7 @@
     "bchaddrjs": "0.5.2",
     "bignumber.js": "9.0.2",
     "bip32": "3.0.1",
+    "bip86": "0.0.1",
     "bitcoinjs-lib": "6.0.1",
     "bitcore-lib-cash": "8.25.28",
     "bs58check": "2.1.2",
diff --git a/src/actions/deriveAddresses.ts b/src/actions/deriveAddresses.ts
index bae78af..894c306 100644
--- a/src/actions/deriveAddresses.ts
+++ b/src/actions/deriveAddresses.ts
@@ -14,6 +14,7 @@ import bs58 from "bs58check";
 import { publicKeyTweakAdd } from "secp256k1";
 
 const bip32 = BIP32Factory(ecc);
+const BIP86 = require('bip86');
 
 class BIP32 {
   publicKey: any;
@@ -134,6 +135,25 @@ function getNativeSegWitAddress(
   return String(address);
 }
 
+/**
+ * derive a Taproot address at a given account and index positions
+ * @param xpub the xpub from which to derive the native SegWit address
+ * @param account account number from which to derive the native SegWit address
+ * @param index index number from which to derive the native SegWit address
+ * @returns the derived Taproot address
+ */
+ function getTaprootAddress(
+  xpub: string,
+  account: number,
+  index: number,
+): string {
+
+  var account1 = new BIP86.fromXPub(xpub);
+  var address = account1.getAddress(index,!!account);
+
+  return String(address);
+}
+
 /**
  * derive a Bitcoin Cash address at a given account and index positions
  * @param xpub the xpub from which to derive the Bitcoin Cash address
@@ -201,6 +221,8 @@ function deriveAddress(
       return getSegWitAddress(xpub, account, index);
     case DerivationMode.NATIVE:
       return getNativeSegWitAddress(xpub, account, index);
+    case DerivationMode.TAPROOT:
+        return getTaprootAddress(xpub,account,index);
     case DerivationMode.BCH:
       return getLegacyBitcoinCashAddress(xpub, account, index);
     case DerivationMode.DOGECOIN:
@@ -221,8 +243,10 @@ function deriveAddress(
  */
 
 function getDerivationMode(address: string) {
-  if (address.match("^(bc1|tb1|ltc1).*")) {
+  if (address.match("^(bc1q|tb1|ltc1).*")) {
     return DerivationMode.NATIVE;
+  } else if (address.match("^[bc1p].*")) {
+    return DerivationMode.TAPROOT;
   } else if (address.match("^[32M].*")) {
     return DerivationMode.SEGWIT;
   } else if (address.match("^[1nmL].*")) {
diff --git a/src/configuration/currencies.ts b/src/configuration/currencies.ts
index f8ce1c9..e2fa3e5 100644
--- a/src/configuration/currencies.ts
+++ b/src/configuration/currencies.ts
@@ -4,6 +4,7 @@ export enum DerivationMode {
   LEGACY = "Legacy",
   NATIVE = "Native SegWit",
   SEGWIT = "SegWit",
+  TAPROOT = "Taproot",
   BCH = "Bitcoin Cash",
   ETHEREUM = "Ethereum",
   DOGECOIN = "Dogecoin",
@@ -20,6 +21,7 @@ export const currencies = {
       DerivationMode.LEGACY,
       DerivationMode.SEGWIT,
       DerivationMode.NATIVE,
+      DerivationMode.TAPROOT,
     ],
     precision: 10 ** 8,
     utxo_based: true,