@bitgo-beta/utxo-lib
Version:
Client-side Bitcoin JavaScript library
184 lines • 26.8 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.getSignatureDigest = exports.getTxidDigest = exports.getOutputsDigest = exports.getSequenceDigest = exports.getPrevoutsDigest = exports.getBlake2bHash = void 0;
/**
* Implements hashing methods described in https://zips.z.cash/zip-0244.
* Only supports full transparent transactions without shielded inputs or outputs.
*/
const bitcoinjs_lib_1 = require("bitcoinjs-lib");
const bufferutils_1 = require("bitcoinjs-lib/src/bufferutils");
const blake2b = require('@bitgo-beta/blake2b');
const UtxoTransaction_1 = require("../UtxoTransaction");
/**
* Blake2b hashing algorithm for Zcash
* @param buffer
* @param personalization
* @returns 256-bit BLAKE2b hash
*/
function getBlake2bHash(buffer, personalization) {
const out = Buffer.allocUnsafe(32);
personalization = Buffer.from(personalization);
return blake2b(out.length, null, null, personalization).update(buffer).digest(out);
}
exports.getBlake2bHash = getBlake2bHash;
function getHeaderDigest(tx) {
// https://zips.z.cash/zip-0244#t-1-header-digest
const mask = tx.overwintered ? 1 : 0;
const writer = bufferutils_1.BufferWriter.withCapacity(4 * 5);
writer.writeInt32(tx.version | (mask << 31)); // Set overwinter bit
writer.writeUInt32(tx.versionGroupId);
writer.writeUInt32(tx.consensusBranchId);
writer.writeUInt32(tx.locktime);
writer.writeUInt32(tx.expiryHeight);
return getBlake2bHash(writer.end(), 'ZTxIdHeadersHash');
}
function getPrevoutsDigest(ins, tag = 'ZTxIdPrevoutHash', sigParams) {
if (sigParams) {
if (sigParams.hashType & bitcoinjs_lib_1.Transaction.SIGHASH_ANYONECANPAY) {
return getPrevoutsDigest([]);
}
}
const bufferWriter = new bufferutils_1.BufferWriter(Buffer.allocUnsafe(36 * ins.length));
ins.forEach(function (txIn) {
bufferWriter.writeSlice(txIn.hash);
bufferWriter.writeUInt32(txIn.index);
});
return getBlake2bHash(bufferWriter.end(), tag);
}
exports.getPrevoutsDigest = getPrevoutsDigest;
function getSequenceDigest(ins, tag = 'ZTxIdSequencHash', sigParams) {
// txid: https://zips.z.cash/zip-0244#t-2b-sequence-digest
// sig: https://zips.z.cash/zip-0244#s-2b-sequence-sig-digest
// https://github.com/zcash-hackworks/zcash-test-vectors/blob/dd8fdb/zip_0244.py#L263
if (sigParams) {
const { hashType } = sigParams;
if (hashType & bitcoinjs_lib_1.Transaction.SIGHASH_ANYONECANPAY ||
(hashType & 0x1f) === bitcoinjs_lib_1.Transaction.SIGHASH_SINGLE ||
(hashType & 0x1f) === bitcoinjs_lib_1.Transaction.SIGHASH_NONE) {
return getSequenceDigest([]);
}
}
const bufferWriter = new bufferutils_1.BufferWriter(Buffer.allocUnsafe(4 * ins.length));
ins.forEach(function (txIn) {
bufferWriter.writeUInt32(txIn.sequence);
});
return getBlake2bHash(bufferWriter.end(), tag);
}
exports.getSequenceDigest = getSequenceDigest;
function getOutputsDigest(outs, tag = 'ZTxIdOutputsHash', sigParams) {
// txid: https://zips.z.cash/zip-0244#t-2c-outputs-digest
// sig: https://zips.z.cash/zip-0244#s-2c-outputs-sig-digest
// https://github.com/zcash-hackworks/zcash-test-vectors/blob/dd8fdb/zip_0244.py#L275
if (sigParams) {
let { hashType } = sigParams;
hashType = hashType & 0x1f;
if (hashType === bitcoinjs_lib_1.Transaction.SIGHASH_SINGLE) {
if (sigParams.inIndex === undefined) {
throw new Error();
}
if (outs[sigParams.inIndex] === undefined) {
return getOutputsDigest(outs);
}
return getOutputsDigest([outs[sigParams.inIndex]]);
}
if (hashType === bitcoinjs_lib_1.Transaction.SIGHASH_NONE) {
return getOutputsDigest([]);
}
return getOutputsDigest(outs, tag);
}
// Find out the size of the outputs and write them
const txOutsSize = outs.reduce(function (sum, output) {
return sum + 8 + UtxoTransaction_1.varSliceSize(output.script);
}, 0);
const bufferWriter = new bufferutils_1.BufferWriter(Buffer.allocUnsafe(txOutsSize));
outs.forEach(function (out) {
bufferWriter.writeUInt64(out.value);
bufferWriter.writeVarSlice(out.script);
});
return getBlake2bHash(bufferWriter.end(), tag);
}
exports.getOutputsDigest = getOutputsDigest;
function getTxinDigest(input, sigParams) {
// https://zips.z.cash/zip-0244#s-2d-txin-sig-digest
// https://github.com/zcash-hackworks/zcash-test-vectors/blob/dd8fdb/zip_0244.py#L291
const writer = bufferutils_1.BufferWriter.withCapacity(32 /* prevout hash */ +
4 /* prevout vin */ +
UtxoTransaction_1.varSliceSize(sigParams.prevOutScript) +
8 /* value */ +
4 /* sequence */);
writer.writeSlice(input.hash);
writer.writeUInt32(input.index);
writer.writeVarSlice(sigParams.prevOutScript);
writer.writeUInt64(sigParams.value);
writer.writeUInt32(input.sequence);
return getBlake2bHash(writer.end(), 'Zcash___TxInHash');
}
function getTransparentDigest(tx, sigParams) {
// txid: https://zips.z.cash/zip-0244#t-2-transparent-digest
// sig: https://zips.z.cash/zip-0244#s-2a-prevouts-sig-digest
if (sigParams) {
if (sigParams.inIndex === undefined) {
return getTransparentDigest(tx);
}
}
let buffer;
if (tx.ins.length || tx.outs.length) {
const writer = bufferutils_1.BufferWriter.withCapacity(32 * (sigParams ? 4 : 3));
writer.writeSlice(getPrevoutsDigest(tx.ins, undefined, sigParams));
writer.writeSlice(getSequenceDigest(tx.ins, undefined, sigParams));
writer.writeSlice(getOutputsDigest(tx.outs, undefined, sigParams));
if (sigParams) {
if (sigParams.inIndex === undefined) {
throw new Error();
}
writer.writeSlice(getTxinDigest(tx.ins[sigParams.inIndex], sigParams));
}
buffer = writer.end();
}
else {
buffer = Buffer.of();
}
return getBlake2bHash(buffer, 'ZTxIdTranspaHash');
}
function getSaplingDigest(tx) {
// https://zips.z.cash/zip-0244#t-3-sapling-digest
return getBlake2bHash(Buffer.of(), 'ZTxIdSaplingHash');
}
function getOrchardDigest(tx) {
// https://zips.z.cash/zip-0244#t-4-orchard-digest
return getBlake2bHash(Buffer.of(), 'ZTxIdOrchardHash');
}
/**
* @param tx
* @param signatureParams - calculates txid when undefined
*/
function getDigest(tx, signatureParams) {
// txid: https://zips.z.cash/zip-0244#id4
// sig: https://zips.z.cash/zip-0244#id13
const writer = bufferutils_1.BufferWriter.withCapacity(32 * 4);
writer.writeSlice(getHeaderDigest(tx));
writer.writeSlice(getTransparentDigest(tx, signatureParams));
writer.writeSlice(getSaplingDigest(tx));
writer.writeSlice(getOrchardDigest(tx));
const tag = 'ZcashTxHash_';
const personalization = bufferutils_1.BufferWriter.withCapacity(tag.length + 4 /* UInt32 */);
personalization.writeSlice(Buffer.from(tag));
personalization.writeUInt32(tx.consensusBranchId);
return getBlake2bHash(writer.end(), personalization.end());
}
function getTxidDigest(tx) {
// https://zips.z.cash/zip-0244#id4
return getDigest(tx);
}
exports.getTxidDigest = getTxidDigest;
function getSignatureDigest(tx, inIndex, prevOutScript, value, hashType) {
// https://zips.z.cash/zip-0244#id13
return getDigest(tx, {
inIndex,
prevOutScript,
value,
hashType,
});
}
exports.getSignatureDigest = getSignatureDigest;
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* Implements hashing methods described in https://zips.z.cash/zip-0244.\n * Only supports full transparent transactions without shielded inputs or outputs.\n */\nimport { Transaction, TxInput, TxOutput } from 'bitcoinjs-lib';\nimport { BufferWriter } from 'bitcoinjs-lib/src/bufferutils';\n\nconst blake2b = require('@bitgo-beta/blake2b');\n\nimport { ZcashTransaction } from './ZcashTransaction';\nimport { varSliceSize } from '../UtxoTransaction';\n\ntype SignatureParams<TNumber extends number | bigint = number> = {\n  inIndex?: number;\n  prevOutScript: Buffer;\n  value: TNumber;\n  hashType: number;\n};\n\n/**\n * Blake2b hashing algorithm for Zcash\n * @param buffer\n * @param personalization\n * @returns 256-bit BLAKE2b hash\n */\nexport function getBlake2bHash(buffer: Buffer, personalization: string | Buffer): Buffer {\n  const out = Buffer.allocUnsafe(32);\n  personalization = Buffer.from(personalization);\n  return blake2b(out.length, null, null, personalization).update(buffer).digest(out);\n}\n\nfunction getHeaderDigest<TNumber extends number | bigint>(tx: ZcashTransaction<TNumber>): Buffer {\n  // https://zips.z.cash/zip-0244#t-1-header-digest\n  const mask = tx.overwintered ? 1 : 0;\n  const writer = BufferWriter.withCapacity(4 * 5);\n  writer.writeInt32(tx.version | (mask << 31)); // Set overwinter bit\n  writer.writeUInt32(tx.versionGroupId);\n  writer.writeUInt32(tx.consensusBranchId);\n  writer.writeUInt32(tx.locktime);\n  writer.writeUInt32(tx.expiryHeight);\n  return getBlake2bHash(writer.end(), 'ZTxIdHeadersHash');\n}\n\nexport function getPrevoutsDigest<TNumber extends number | bigint>(\n  ins: TxInput[],\n  tag = 'ZTxIdPrevoutHash',\n  sigParams?: SignatureParams<TNumber>\n): Buffer {\n  if (sigParams) {\n    if (sigParams.hashType & Transaction.SIGHASH_ANYONECANPAY) {\n      return getPrevoutsDigest([]);\n    }\n  }\n\n  const bufferWriter = new BufferWriter(Buffer.allocUnsafe(36 * ins.length));\n  ins.forEach(function (txIn) {\n    bufferWriter.writeSlice(txIn.hash);\n    bufferWriter.writeUInt32(txIn.index);\n  });\n  return getBlake2bHash(bufferWriter.end(), tag);\n}\n\nexport function getSequenceDigest<TNumber extends number | bigint>(\n  ins: TxInput[],\n  tag = 'ZTxIdSequencHash',\n  sigParams?: SignatureParams<TNumber>\n): Buffer {\n  // txid: https://zips.z.cash/zip-0244#t-2b-sequence-digest\n  // sig: https://zips.z.cash/zip-0244#s-2b-sequence-sig-digest\n  // https://github.com/zcash-hackworks/zcash-test-vectors/blob/dd8fdb/zip_0244.py#L263\n  if (sigParams) {\n    const { hashType } = sigParams;\n    if (\n      hashType & Transaction.SIGHASH_ANYONECANPAY ||\n      (hashType & 0x1f) === Transaction.SIGHASH_SINGLE ||\n      (hashType & 0x1f) === Transaction.SIGHASH_NONE\n    ) {\n      return getSequenceDigest([]);\n    }\n  }\n\n  const bufferWriter = new BufferWriter(Buffer.allocUnsafe(4 * ins.length));\n\n  ins.forEach(function (txIn) {\n    bufferWriter.writeUInt32(txIn.sequence);\n  });\n\n  return getBlake2bHash(bufferWriter.end(), tag);\n}\n\nexport function getOutputsDigest<TNumber extends number | bigint>(\n  outs: TxOutput<TNumber>[],\n  tag = 'ZTxIdOutputsHash',\n  sigParams?: SignatureParams<TNumber>\n): Buffer {\n  // txid: https://zips.z.cash/zip-0244#t-2c-outputs-digest\n  // sig: https://zips.z.cash/zip-0244#s-2c-outputs-sig-digest\n  // https://github.com/zcash-hackworks/zcash-test-vectors/blob/dd8fdb/zip_0244.py#L275\n  if (sigParams) {\n    let { hashType } = sigParams;\n    hashType = hashType & 0x1f;\n\n    if (hashType === Transaction.SIGHASH_SINGLE) {\n      if (sigParams.inIndex === undefined) {\n        throw new Error();\n      }\n      if (outs[sigParams.inIndex] === undefined) {\n        return getOutputsDigest(outs);\n      }\n      return getOutputsDigest([outs[sigParams.inIndex]]);\n    }\n\n    if (hashType === Transaction.SIGHASH_NONE) {\n      return getOutputsDigest([]);\n    }\n\n    return getOutputsDigest(outs, tag);\n  }\n\n  // Find out the size of the outputs and write them\n  const txOutsSize = outs.reduce(function (sum, output) {\n    return sum + 8 + varSliceSize(output.script);\n  }, 0);\n\n  const bufferWriter = new BufferWriter(Buffer.allocUnsafe(txOutsSize));\n\n  outs.forEach(function (out) {\n    bufferWriter.writeUInt64(out.value);\n    bufferWriter.writeVarSlice(out.script);\n  });\n\n  return getBlake2bHash(bufferWriter.end(), tag);\n}\n\nfunction getTxinDigest<TNumber extends number | bigint>(input: TxInput, sigParams: SignatureParams<TNumber>) {\n  // https://zips.z.cash/zip-0244#s-2d-txin-sig-digest\n  // https://github.com/zcash-hackworks/zcash-test-vectors/blob/dd8fdb/zip_0244.py#L291\n  const writer = BufferWriter.withCapacity(\n    32 /* prevout hash */ +\n      4 /* prevout vin */ +\n      varSliceSize(sigParams.prevOutScript) +\n      8 /* value */ +\n      4 /* sequence */\n  );\n  writer.writeSlice(input.hash);\n  writer.writeUInt32(input.index);\n  writer.writeVarSlice(sigParams.prevOutScript);\n  writer.writeUInt64(sigParams.value);\n  writer.writeUInt32(input.sequence);\n  return getBlake2bHash(writer.end(), 'Zcash___TxInHash');\n}\n\nfunction getTransparentDigest<TNumber extends number | bigint>(\n  tx: { ins: TxInput[]; outs: TxOutput<TNumber>[] },\n  sigParams?: SignatureParams<TNumber>\n): Buffer {\n  // txid: https://zips.z.cash/zip-0244#t-2-transparent-digest\n  // sig: https://zips.z.cash/zip-0244#s-2a-prevouts-sig-digest\n  if (sigParams) {\n    if (sigParams.inIndex === undefined) {\n      return getTransparentDigest(tx);\n    }\n  }\n\n  let buffer;\n  if (tx.ins.length || tx.outs.length) {\n    const writer = BufferWriter.withCapacity(32 * (sigParams ? 4 : 3));\n    writer.writeSlice(getPrevoutsDigest(tx.ins, undefined, sigParams));\n    writer.writeSlice(getSequenceDigest(tx.ins, undefined, sigParams));\n    writer.writeSlice(getOutputsDigest(tx.outs, undefined, sigParams));\n    if (sigParams) {\n      if (sigParams.inIndex === undefined) {\n        throw new Error();\n      }\n      writer.writeSlice(getTxinDigest(tx.ins[sigParams.inIndex], sigParams));\n    }\n    buffer = writer.end();\n  } else {\n    buffer = Buffer.of();\n  }\n  return getBlake2bHash(buffer, 'ZTxIdTranspaHash');\n}\n\nfunction getSaplingDigest<TNumber extends number | bigint>(tx: ZcashTransaction<TNumber>): Buffer {\n  // https://zips.z.cash/zip-0244#t-3-sapling-digest\n  return getBlake2bHash(Buffer.of(), 'ZTxIdSaplingHash');\n}\n\nfunction getOrchardDigest<TNumber extends number | bigint>(tx: ZcashTransaction<TNumber>): Buffer {\n  // https://zips.z.cash/zip-0244#t-4-orchard-digest\n  return getBlake2bHash(Buffer.of(), 'ZTxIdOrchardHash');\n}\n\n/**\n * @param tx\n * @param signatureParams - calculates txid when undefined\n */\nfunction getDigest<TNumber extends number | bigint>(\n  tx: ZcashTransaction<TNumber>,\n  signatureParams?: SignatureParams<TNumber>\n): Buffer {\n  // txid: https://zips.z.cash/zip-0244#id4\n  // sig: https://zips.z.cash/zip-0244#id13\n  const writer = BufferWriter.withCapacity(32 * 4);\n  writer.writeSlice(getHeaderDigest(tx));\n  writer.writeSlice(getTransparentDigest(tx, signatureParams));\n  writer.writeSlice(getSaplingDigest(tx));\n  writer.writeSlice(getOrchardDigest(tx));\n\n  const tag = 'ZcashTxHash_';\n  const personalization = BufferWriter.withCapacity(tag.length + 4 /* UInt32 */);\n  personalization.writeSlice(Buffer.from(tag));\n  personalization.writeUInt32(tx.consensusBranchId);\n  return getBlake2bHash(writer.end(), personalization.end());\n}\n\nexport function getTxidDigest<TNumber extends number | bigint>(tx: ZcashTransaction<TNumber>): Buffer {\n  // https://zips.z.cash/zip-0244#id4\n  return getDigest(tx);\n}\n\nexport function getSignatureDigest<TNumber extends number | bigint>(\n  tx: ZcashTransaction<TNumber>,\n  inIndex: number | undefined,\n  prevOutScript: Buffer,\n  value: TNumber,\n  hashType: number\n): Buffer {\n  // https://zips.z.cash/zip-0244#id13\n  return getDigest(tx, {\n    inIndex,\n    prevOutScript,\n    value,\n    hashType,\n  });\n}\n"]}