@bitgo/utxo-lib
Version:
Client-side Bitcoin JavaScript library
323 lines • 42 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.scriptTypes2Of3 = exports.scriptTypeP2shP2pk = exports.scriptTypeForChain = void 0;
exports.isScriptType2Of3 = isScriptType2Of3;
exports.hasWitnessData = hasWitnessData;
exports.isSupportedScriptType = isSupportedScriptType;
exports.scriptType2Of3AsPrevOutType = scriptType2Of3AsPrevOutType;
exports.createOutputScriptP2shP2pk = createOutputScriptP2shP2pk;
exports.getOutputScript = getOutputScript;
exports.createOutputScript2of3 = createOutputScript2of3;
exports.toXOnlyPublicKey = toXOnlyPublicKey;
exports.checkXOnlyPublicKey = checkXOnlyPublicKey;
exports.checkPlainPublicKey = checkPlainPublicKey;
exports.checkTapMerkleRoot = checkTapMerkleRoot;
exports.checkTxHash = checkTxHash;
exports.createPaymentP2trCommon = createPaymentP2trCommon;
exports.createPaymentP2tr = createPaymentP2tr;
exports.createPaymentP2trMusig2 = createPaymentP2trMusig2;
exports.getLeafHash = getLeafHash;
exports.createKeyPathP2trMusig2 = createKeyPathP2trMusig2;
exports.createSpendScriptP2tr = createSpendScriptP2tr;
exports.createSpendScriptP2trMusig2 = createSpendScriptP2trMusig2;
const assert_1 = require("assert");
const bitcoinjs = require("bitcoinjs-lib");
const networks_1 = require("../networks");
const p2trPayments = require("../payments");
const taproot = require("../taproot");
const types_1 = require("./types");
const secp256k1_1 = require("@bitgo/secp256k1");
const taproot_1 = require("../taproot");
var chains_1 = require("./wallet/chains");
Object.defineProperty(exports, "scriptTypeForChain", { enumerable: true, get: function () { return chains_1.scriptTypeForChain; } });
exports.scriptTypeP2shP2pk = 'p2shP2pk';
exports.scriptTypes2Of3 = ['p2sh', 'p2shP2wsh', 'p2wsh', 'p2tr', 'p2trMusig2'];
function isScriptType2Of3(t) {
return exports.scriptTypes2Of3.includes(t);
}
/**
* @return true iff scriptType requires witness data
*/
function hasWitnessData(scriptType) {
return ['p2shP2wsh', 'p2wsh', 'p2tr', 'p2trMusig2'].includes(scriptType);
}
/**
* @param network
* @param scriptType
* @return true iff script type is supported for network
*/
function isSupportedScriptType(network, scriptType) {
switch (scriptType) {
case 'p2sh':
case 'p2shP2pk':
return true;
case 'p2shP2wsh':
case 'p2wsh':
return (0, networks_1.supportsSegwit)(network);
case 'p2tr':
case 'p2trMusig2':
return (0, networks_1.supportsTaproot)(network);
}
/* istanbul ignore next */
throw new Error(`unexpected script type ${scriptType}`);
}
/**
* @param t
* @return string prevOut as defined in PREVOUT_TYPES (bitcoinjs-lib/.../transaction_builder.js)
*/
function scriptType2Of3AsPrevOutType(t) {
switch (t) {
case 'p2sh':
return 'p2sh-p2ms';
case 'p2shP2wsh':
return 'p2sh-p2wsh-p2ms';
case 'p2wsh':
return 'p2wsh-p2ms';
case 'p2tr':
return 'p2tr-p2ns';
case 'p2trMusig2':
return 'p2tr';
}
/* istanbul ignore next */
throw new Error(`unsupported script type ${t}`);
}
/**
* Return scripts for p2sh-p2pk (used for BCH/BSV replay protection)
* @param pubkey
*/
function createOutputScriptP2shP2pk(pubkey) {
const p2pk = bitcoinjs.payments.p2pk({ pubkey });
const p2sh = bitcoinjs.payments.p2sh({ redeem: p2pk });
if (!p2sh.output || !p2pk.output) {
throw new Error(`invalid state`);
}
return {
scriptPubKey: p2sh.output,
redeemScript: p2pk.output,
};
}
function getOutputScript(scriptType, conditionScript) {
let output;
switch (scriptType) {
case 'p2sh':
({ output } = bitcoinjs.payments.p2sh({ redeem: { output: conditionScript } }));
break;
case 'p2shP2wsh':
({ output } = bitcoinjs.payments.p2sh({
redeem: { output: getOutputScript('p2wsh', conditionScript) },
}));
break;
case 'p2wsh':
({ output } = bitcoinjs.payments.p2wsh({ redeem: { output: conditionScript } }));
break;
}
if (output === undefined) {
throw new Error(`output undefined`);
}
return output;
}
/**
* Return scripts for 2-of-3 multisig output
* @param pubkeys - the key triple for multisig
* @param scriptType
* @param network - if set, performs sanity check for scriptType support
* @returns {{redeemScript, witnessScript, scriptPubKey}}
*/
function createOutputScript2of3(pubkeys, scriptType, network) {
if (network) {
if (!isSupportedScriptType(network, scriptType)) {
throw new Error(`unsupported script type ${scriptType} for network`);
}
}
if (!(0, types_1.isTriple)(pubkeys)) {
throw new Error(`must provide pubkey triple`);
}
pubkeys.forEach((key) => {
if (key.length !== 33) {
throw new Error(`Unexpected key length ${key.length}. Must use compressed keys.`);
}
});
if (scriptType === 'p2tr' || scriptType === 'p2trMusig2') {
// p2tr/p2trMusig2 addresses use a combination of 2 of 2 multisig scripts distinct from
// the 2 of 3 multisig used for other script types
return createTaprootScript2of3(scriptType, pubkeys);
}
const script2of3 = bitcoinjs.payments.p2ms({ m: 2, pubkeys });
(0, assert_1.ok)(script2of3.output);
let redeemScript;
let witnessScript;
switch (scriptType) {
case 'p2sh':
redeemScript = script2of3;
break;
case 'p2shP2wsh':
witnessScript = script2of3;
redeemScript = bitcoinjs.payments.p2wsh({ redeem: script2of3 });
break;
case 'p2wsh':
witnessScript = script2of3;
break;
default:
throw new Error(`unknown multisig script type ${scriptType}`);
}
return {
scriptPubKey: getOutputScript(scriptType, script2of3.output),
redeemScript: redeemScript?.output,
witnessScript: witnessScript?.output,
};
}
function toXOnlyPublicKey(b) {
if (b.length === 33) {
return b.slice(1);
}
if (b.length === 32) {
return b;
}
throw new Error(`invalid key size ${b.length}`);
}
function checkSize(b, targetSize, name) {
if (b.length === targetSize) {
return b;
}
throw new Error(`invalid size ${b.length}. Must use ${name}.`);
}
/**
* Validates size of the pub key for 32 bytes and returns the same iff true.
*/
function checkXOnlyPublicKey(b) {
return checkSize(b, 32, 'x-only key');
}
/**
* Validates size of the pub key for 32 bytes and returns the same iff true.
*/
function checkPlainPublicKey(b) {
return checkSize(b, 33, 'plain key');
}
function checkTapMerkleRoot(b) {
return checkSize(b, 32, 'tap merkle root');
}
function checkTxHash(b) {
return checkSize(b, 32, 'tx hash');
}
function getTaptreeKeyCombinations(scriptType, keys) {
const [userKey, backupKey, bitGoKey] = keys.map((k) => toXOnlyPublicKey(k));
return scriptType === 'p2tr'
? [
[userKey, bitGoKey],
[userKey, backupKey],
[backupKey, bitGoKey],
]
: [
[userKey, backupKey],
[backupKey, bitGoKey],
];
}
function getKeyPathCombination(scriptType, keys) {
const sanitizePublicKey = scriptType === 'p2tr' ? toXOnlyPublicKey : checkPlainPublicKey;
return [sanitizePublicKey(keys[0]), sanitizePublicKey(keys[2])];
}
function getRedeemIndex(keyCombinations, signer, cosigner) {
signer = toXOnlyPublicKey(signer);
cosigner = toXOnlyPublicKey(cosigner);
const i = keyCombinations.findIndex(([a, b]) => {
if (a.length !== signer.length || b.length !== cosigner.length) {
throw new Error(`invalid comparison`);
}
return (a.equals(signer) && b.equals(cosigner)) || (a.equals(cosigner) && b.equals(signer));
});
if (0 <= i) {
return i;
}
throw new Error(`could not find singer/cosigner combination`);
}
function createPaymentP2trCommon(scriptType, pubkeys, redeemIndex) {
const keyCombinations2of2 = getTaptreeKeyCombinations(scriptType, pubkeys);
if (typeof redeemIndex === 'object') {
redeemIndex = getRedeemIndex(keyCombinations2of2, redeemIndex.signer, redeemIndex.cosigner);
}
const redeems = keyCombinations2of2.map((pubkeys, index) => p2trPayments.p2tr_ns({
pubkeys,
depth: scriptType === 'p2trMusig2' || index === 0 ? 1 : 2,
}, { eccLib: secp256k1_1.ecc }));
return p2trPayments.p2tr({
pubkeys: getKeyPathCombination(scriptType, pubkeys),
redeems,
redeemIndex,
}, { eccLib: secp256k1_1.ecc });
}
function createPaymentP2tr(pubkeys, redeemIndex) {
return createPaymentP2trCommon('p2tr', pubkeys, redeemIndex);
}
function createPaymentP2trMusig2(pubkeys, redeemIndex) {
return createPaymentP2trCommon('p2trMusig2', pubkeys, redeemIndex);
}
function getLeafHashCommon(scriptType, params) {
if ('publicKeys' in params) {
params = createPaymentP2trCommon(scriptType, params.publicKeys, params);
}
const { output, controlBlock, redeem } = params;
if (!output || !controlBlock || !redeem || !redeem.output) {
throw new Error(`invalid state`);
}
return taproot.getTapleafHash(secp256k1_1.ecc, controlBlock, redeem.output);
}
function getLeafHash(params) {
return getLeafHashCommon('p2tr', params);
}
function createKeyPathP2trMusig2(pubkeys) {
const payment = createPaymentP2trCommon('p2trMusig2', pubkeys);
(0, assert_1.ok)(payment.internalPubkey);
(0, assert_1.ok)(payment.tapTree);
return {
internalPubkey: payment.internalPubkey,
outputPubkey: (0, taproot_1.getTweakedOutputKey)(payment),
taptreeRoot: (0, taproot_1.getDepthFirstTaptree)(payment.tapTree).root,
};
}
function createSpendScriptP2trCommon(scriptType, pubkeys, keyCombination) {
const keyCombinations = getTaptreeKeyCombinations(scriptType, pubkeys);
const [a, b] = keyCombination.map((k) => toXOnlyPublicKey(k));
const redeemIndex = keyCombinations.findIndex(([c, d]) => (a.equals(c) && b.equals(d)) || (a.equals(d) && b.equals(c)));
if (redeemIndex < 0) {
throw new Error(`could not find redeemIndex for key combination`);
}
const payment = createPaymentP2trCommon(scriptType, pubkeys, redeemIndex);
const { controlBlock } = payment;
(0, assert_1.ok)(Buffer.isBuffer(controlBlock));
(0, assert_1.ok)(payment.redeem);
const leafScript = payment.redeem.output;
(0, assert_1.ok)(Buffer.isBuffer(leafScript));
const parsedControlBlock = taproot.parseControlBlock(secp256k1_1.ecc, controlBlock);
const { leafVersion } = parsedControlBlock;
const leafHash = taproot.getTapleafHash(secp256k1_1.ecc, parsedControlBlock, leafScript);
return {
controlBlock,
witnessScript: leafScript,
leafVersion,
leafHash,
};
}
function createSpendScriptP2tr(pubkeys, keyCombination) {
return createSpendScriptP2trCommon('p2tr', pubkeys, keyCombination);
}
function createSpendScriptP2trMusig2(pubkeys, keyCombination) {
return createSpendScriptP2trCommon('p2trMusig2', pubkeys, keyCombination);
}
/**
* Creates and returns a taproot output script using the user+bitgo keys for the aggregate
* public key using MuSig2 and a taptree containing either of the following depends on scriptType.
* p2tr type: a user+bitgo 2-of-2 script at the first depth level of the tree and user+backup
* and bitgo+backup 2-of-2 scripts one level deeper.
* p2trMusig2 type: user+backup and bitgo+backup 2-of-2 scripts at the first depth level of the
* tree.
* @param pubkeys - a pubkey array containing the user key, backup key, and bitgo key in that order
* @returns {{scriptPubKey}}
*/
function createTaprootScript2of3(scriptType, pubkeys) {
const { output } = createPaymentP2trCommon(scriptType, pubkeys);
(0, assert_1.ok)(Buffer.isBuffer(output));
return {
scriptPubKey: output,
};
}
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{ ok as assert } from 'assert';\nimport * as bitcoinjs from 'bitcoinjs-lib';\n\nimport { Network, supportsSegwit, supportsTaproot } from '../networks';\nimport * as p2trPayments from '../payments';\nimport * as taproot from '../taproot';\n\nimport { isTriple, Triple, Tuple } from './types';\n\nimport { ecc as eccLib } from '@bitgo/secp256k1';\nimport { getDepthFirstTaptree, getTweakedOutputKey } from '../taproot';\n\nexport { scriptTypeForChain } from './wallet/chains';\n\nexport const scriptTypeP2shP2pk = 'p2shP2pk';\nexport type ScriptTypeP2shP2pk = typeof scriptTypeP2shP2pk;\n\nexport const scriptTypes2Of3 = ['p2sh', 'p2shP2wsh', 'p2wsh', 'p2tr', 'p2trMusig2'] as const;\nexport type ScriptType2Of3 = (typeof scriptTypes2Of3)[number];\n\nexport function isScriptType2Of3(t: string): t is ScriptType2Of3 {\n  return scriptTypes2Of3.includes(t as ScriptType2Of3);\n}\n\nexport type ScriptType = ScriptTypeP2shP2pk | ScriptType2Of3;\n\n/**\n * @return true iff scriptType requires witness data\n */\nexport function hasWitnessData(scriptType: ScriptType): scriptType is 'p2shP2wsh' | 'p2wsh' | 'p2tr' | 'p2trMusig2' {\n  return ['p2shP2wsh', 'p2wsh', 'p2tr', 'p2trMusig2'].includes(scriptType);\n}\n\n/**\n * @param network\n * @param scriptType\n * @return true iff script type is supported for network\n */\nexport function isSupportedScriptType(network: Network, scriptType: ScriptType): boolean {\n  switch (scriptType) {\n    case 'p2sh':\n    case 'p2shP2pk':\n      return true;\n    case 'p2shP2wsh':\n    case 'p2wsh':\n      return supportsSegwit(network);\n    case 'p2tr':\n    case 'p2trMusig2':\n      return supportsTaproot(network);\n  }\n\n  /* istanbul ignore next */\n  throw new Error(`unexpected script type ${scriptType}`);\n}\n\n/**\n * @param t\n * @return string prevOut as defined in PREVOUT_TYPES (bitcoinjs-lib/.../transaction_builder.js)\n */\nexport function scriptType2Of3AsPrevOutType(t: ScriptType2Of3): string {\n  switch (t) {\n    case 'p2sh':\n      return 'p2sh-p2ms';\n    case 'p2shP2wsh':\n      return 'p2sh-p2wsh-p2ms';\n    case 'p2wsh':\n      return 'p2wsh-p2ms';\n    case 'p2tr':\n      return 'p2tr-p2ns';\n    case 'p2trMusig2':\n      return 'p2tr';\n  }\n\n  /* istanbul ignore next */\n  throw new Error(`unsupported script type ${t}`);\n}\n\nexport type SpendableScript = {\n  scriptPubKey: Buffer;\n  redeemScript?: Buffer;\n  witnessScript?: Buffer;\n};\n\nexport type SpendScriptP2tr = {\n  controlBlock: Buffer;\n  witnessScript: Buffer;\n  leafVersion: number;\n  leafHash: Buffer;\n};\n\n/**\n * Tweak data holder for P2tr Musig2 key path.\n */\nexport type KeyPathP2trMusig2 = {\n  internalPubkey: Buffer;\n  outputPubkey: Buffer;\n  taptreeRoot: Buffer;\n};\n\n/**\n * Return scripts for p2sh-p2pk (used for BCH/BSV replay protection)\n * @param pubkey\n */\nexport function createOutputScriptP2shP2pk(pubkey: Buffer): SpendableScript {\n  const p2pk = bitcoinjs.payments.p2pk({ pubkey });\n  const p2sh = bitcoinjs.payments.p2sh({ redeem: p2pk });\n  if (!p2sh.output || !p2pk.output) {\n    throw new Error(`invalid state`);\n  }\n  return {\n    scriptPubKey: p2sh.output,\n    redeemScript: p2pk.output,\n  };\n}\n\nexport function getOutputScript(scriptType: 'p2sh' | 'p2shP2wsh' | 'p2wsh', conditionScript: Buffer): Buffer {\n  let output;\n  switch (scriptType) {\n    case 'p2sh':\n      ({ output } = bitcoinjs.payments.p2sh({ redeem: { output: conditionScript } }));\n      break;\n    case 'p2shP2wsh':\n      ({ output } = bitcoinjs.payments.p2sh({\n        redeem: { output: getOutputScript('p2wsh', conditionScript) },\n      }));\n      break;\n    case 'p2wsh':\n      ({ output } = bitcoinjs.payments.p2wsh({ redeem: { output: conditionScript } }));\n      break;\n  }\n  if (output === undefined) {\n    throw new Error(`output undefined`);\n  }\n  return output;\n}\n\n/**\n * Return scripts for 2-of-3 multisig output\n * @param pubkeys - the key triple for multisig\n * @param scriptType\n * @param network - if set, performs sanity check for scriptType support\n * @returns {{redeemScript, witnessScript, scriptPubKey}}\n */\nexport function createOutputScript2of3(\n  pubkeys: Buffer[],\n  scriptType: ScriptType2Of3,\n  network?: Network\n): SpendableScript {\n  if (network) {\n    if (!isSupportedScriptType(network, scriptType)) {\n      throw new Error(`unsupported script type ${scriptType} for network`);\n    }\n  }\n\n  if (!isTriple(pubkeys)) {\n    throw new Error(`must provide pubkey triple`);\n  }\n\n  pubkeys.forEach((key) => {\n    if (key.length !== 33) {\n      throw new Error(`Unexpected key length ${key.length}. Must use compressed keys.`);\n    }\n  });\n\n  if (scriptType === 'p2tr' || scriptType === 'p2trMusig2') {\n    // p2tr/p2trMusig2 addresses use a combination of 2 of 2 multisig scripts distinct from\n    // the 2 of 3 multisig used for other script types\n    return createTaprootScript2of3(scriptType, pubkeys);\n  }\n\n  const script2of3 = bitcoinjs.payments.p2ms({ m: 2, pubkeys });\n  assert(script2of3.output);\n\n  let redeemScript: bitcoinjs.Payment | undefined;\n  let witnessScript: bitcoinjs.Payment | undefined;\n  switch (scriptType) {\n    case 'p2sh':\n      redeemScript = script2of3;\n      break;\n    case 'p2shP2wsh':\n      witnessScript = script2of3;\n      redeemScript = bitcoinjs.payments.p2wsh({ redeem: script2of3 });\n      break;\n    case 'p2wsh':\n      witnessScript = script2of3;\n      break;\n    default:\n      throw new Error(`unknown multisig script type ${scriptType}`);\n  }\n\n  return {\n    scriptPubKey: getOutputScript(scriptType, script2of3.output),\n    redeemScript: redeemScript?.output,\n    witnessScript: witnessScript?.output,\n  };\n}\n\nexport function toXOnlyPublicKey(b: Buffer): Buffer {\n  if (b.length === 33) {\n    return b.slice(1);\n  }\n  if (b.length === 32) {\n    return b;\n  }\n  throw new Error(`invalid key size ${b.length}`);\n}\n\nfunction checkSize(b: Buffer, targetSize: number, name: string): Buffer {\n  if (b.length === targetSize) {\n    return b;\n  }\n  throw new Error(`invalid size ${b.length}. Must use ${name}.`);\n}\n\n/**\n * Validates size of the pub key for 32 bytes and returns the same iff true.\n */\nexport function checkXOnlyPublicKey(b: Buffer): Buffer {\n  return checkSize(b, 32, 'x-only key');\n}\n\n/**\n * Validates size of the pub key for 32 bytes and returns the same iff true.\n */\nexport function checkPlainPublicKey(b: Buffer): Buffer {\n  return checkSize(b, 33, 'plain key');\n}\n\nexport function checkTapMerkleRoot(b: Buffer): Buffer {\n  return checkSize(b, 32, 'tap merkle root');\n}\n\nexport function checkTxHash(b: Buffer): Buffer {\n  return checkSize(b, 32, 'tx hash');\n}\n\nfunction getTaptreeKeyCombinations(scriptType: 'p2tr' | 'p2trMusig2', keys: Triple<Buffer>): Tuple<Buffer>[] {\n  const [userKey, backupKey, bitGoKey] = keys.map((k) => toXOnlyPublicKey(k));\n  return scriptType === 'p2tr'\n    ? [\n        [userKey, bitGoKey],\n        [userKey, backupKey],\n        [backupKey, bitGoKey],\n      ]\n    : [\n        [userKey, backupKey],\n        [backupKey, bitGoKey],\n      ];\n}\n\nfunction getKeyPathCombination(scriptType: 'p2tr' | 'p2trMusig2', keys: Triple<Buffer>): Tuple<Buffer> {\n  const sanitizePublicKey = scriptType === 'p2tr' ? toXOnlyPublicKey : checkPlainPublicKey;\n  return [sanitizePublicKey(keys[0]), sanitizePublicKey(keys[2])];\n}\n\nfunction getRedeemIndex(keyCombinations: [Buffer, Buffer][], signer: Buffer, cosigner: Buffer): number {\n  signer = toXOnlyPublicKey(signer);\n  cosigner = toXOnlyPublicKey(cosigner);\n  const i = keyCombinations.findIndex(([a, b]) => {\n    if (a.length !== signer.length || b.length !== cosigner.length) {\n      throw new Error(`invalid comparison`);\n    }\n    return (a.equals(signer) && b.equals(cosigner)) || (a.equals(cosigner) && b.equals(signer));\n  });\n  if (0 <= i) {\n    return i;\n  }\n  throw new Error(`could not find singer/cosigner combination`);\n}\n\nexport function createPaymentP2trCommon(\n  scriptType: 'p2tr' | 'p2trMusig2',\n  pubkeys: Triple<Buffer>,\n  redeemIndex?: number | { signer: Buffer; cosigner: Buffer }\n): bitcoinjs.Payment {\n  const keyCombinations2of2 = getTaptreeKeyCombinations(scriptType, pubkeys);\n  if (typeof redeemIndex === 'object') {\n    redeemIndex = getRedeemIndex(keyCombinations2of2, redeemIndex.signer, redeemIndex.cosigner);\n  }\n  const redeems = keyCombinations2of2.map((pubkeys, index) =>\n    p2trPayments.p2tr_ns(\n      {\n        pubkeys,\n        depth: scriptType === 'p2trMusig2' || index === 0 ? 1 : 2,\n      },\n      { eccLib }\n    )\n  );\n\n  return p2trPayments.p2tr(\n    {\n      pubkeys: getKeyPathCombination(scriptType, pubkeys),\n      redeems,\n      redeemIndex,\n    },\n    { eccLib }\n  );\n}\n\nexport function createPaymentP2tr(\n  pubkeys: Triple<Buffer>,\n  redeemIndex?: number | { signer: Buffer; cosigner: Buffer }\n): bitcoinjs.Payment {\n  return createPaymentP2trCommon('p2tr', pubkeys, redeemIndex);\n}\n\nexport function createPaymentP2trMusig2(\n  pubkeys: Triple<Buffer>,\n  redeemIndex?: number | { signer: Buffer; cosigner: Buffer }\n): bitcoinjs.Payment {\n  return createPaymentP2trCommon('p2trMusig2', pubkeys, redeemIndex);\n}\n\nfunction getLeafHashCommon(\n  scriptType: 'p2tr' | 'p2trMusig2',\n  params: bitcoinjs.Payment | { publicKeys: Triple<Buffer>; signer: Buffer; cosigner: Buffer }\n): Buffer {\n  if ('publicKeys' in params) {\n    params = createPaymentP2trCommon(scriptType, params.publicKeys, params);\n  }\n  const { output, controlBlock, redeem } = params;\n  if (!output || !controlBlock || !redeem || !redeem.output) {\n    throw new Error(`invalid state`);\n  }\n  return taproot.getTapleafHash(eccLib, controlBlock, redeem.output);\n}\n\nexport function getLeafHash(\n  params: bitcoinjs.Payment | { publicKeys: Triple<Buffer>; signer: Buffer; cosigner: Buffer }\n): Buffer {\n  return getLeafHashCommon('p2tr', params);\n}\n\nexport function createKeyPathP2trMusig2(pubkeys: Triple<Buffer>): KeyPathP2trMusig2 {\n  const payment = createPaymentP2trCommon('p2trMusig2', pubkeys);\n  assert(payment.internalPubkey);\n  assert(payment.tapTree);\n  return {\n    internalPubkey: payment.internalPubkey,\n    outputPubkey: getTweakedOutputKey(payment),\n    taptreeRoot: getDepthFirstTaptree(payment.tapTree).root,\n  };\n}\n\nfunction createSpendScriptP2trCommon(\n  scriptType: 'p2tr' | 'p2trMusig2',\n  pubkeys: Triple<Buffer>,\n  keyCombination: Tuple<Buffer>\n): SpendScriptP2tr {\n  const keyCombinations = getTaptreeKeyCombinations(scriptType, pubkeys);\n  const [a, b] = keyCombination.map((k) => toXOnlyPublicKey(k));\n  const redeemIndex = keyCombinations.findIndex(\n    ([c, d]) => (a.equals(c) && b.equals(d)) || (a.equals(d) && b.equals(c))\n  );\n\n  if (redeemIndex < 0) {\n    throw new Error(`could not find redeemIndex for key combination`);\n  }\n\n  const payment = createPaymentP2trCommon(scriptType, pubkeys, redeemIndex);\n  const { controlBlock } = payment;\n  assert(Buffer.isBuffer(controlBlock));\n\n  assert(payment.redeem);\n  const leafScript = payment.redeem.output;\n  assert(Buffer.isBuffer(leafScript));\n\n  const parsedControlBlock = taproot.parseControlBlock(eccLib, controlBlock);\n  const { leafVersion } = parsedControlBlock;\n  const leafHash = taproot.getTapleafHash(eccLib, parsedControlBlock, leafScript);\n\n  return {\n    controlBlock,\n    witnessScript: leafScript,\n    leafVersion,\n    leafHash,\n  };\n}\n\nexport function createSpendScriptP2tr(pubkeys: Triple<Buffer>, keyCombination: Tuple<Buffer>): SpendScriptP2tr {\n  return createSpendScriptP2trCommon('p2tr', pubkeys, keyCombination);\n}\n\nexport function createSpendScriptP2trMusig2(pubkeys: Triple<Buffer>, keyCombination: Tuple<Buffer>): SpendScriptP2tr {\n  return createSpendScriptP2trCommon('p2trMusig2', pubkeys, keyCombination);\n}\n\n/**\n * Creates and returns a taproot output script using the user+bitgo keys for the aggregate\n * public key using MuSig2 and a taptree containing either of the following depends on scriptType.\n * p2tr type: a user+bitgo 2-of-2 script at the first depth level of the tree and user+backup\n * and bitgo+backup 2-of-2 scripts one level deeper.\n * p2trMusig2 type: user+backup and bitgo+backup 2-of-2 scripts at the first depth level of the\n * tree.\n * @param pubkeys - a pubkey array containing the user key, backup key, and bitgo key in that order\n * @returns {{scriptPubKey}}\n */\nfunction createTaprootScript2of3(scriptType: 'p2tr' | 'p2trMusig2', pubkeys: Triple<Buffer>): SpendableScript {\n  const { output } = createPaymentP2trCommon(scriptType, pubkeys);\n  assert(Buffer.isBuffer(output));\n  return {\n    scriptPubKey: output,\n  };\n}\n"]}