@okxweb3/coin-bitcoin/dist/bitcoinjs-lib/script_signature.js

@okxweb3/coin-bitcoin is a Bitcoin SDK for building Web3 wallets and applications. It supports BTC, BSV, DOGE, LTC, and TBTC, enabling private key management, transaction signing, address generation, and inscriptions like BRC-20, Runes, CAT, and Atomicals

"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    var desc = Object.getOwnPropertyDescriptor(m, k);
    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
      desc = { enumerable: true, get: function() { return m[k]; } };
    }
    Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
    Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
    o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
    if (mod && mod.__esModule) return mod;
    var result = {};
    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
    __setModuleDefault(result, mod);
    return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.encode = exports.decode = void 0;
const bip66 = __importStar(require("./bip66"));
const types = __importStar(require("./types"));
const { typeforce } = types;
const ZERO = Buffer.alloc(1, 0);
function toDER(x) {
    let i = 0;
    while (x[i] === 0)
        ++i;
    if (i === x.length)
        return ZERO;
    x = x.slice(i);
    if (x[0] & 0x80)
        return Buffer.concat([ZERO, x], 1 + x.length);
    return x;
}
function fromDER(x) {
    if (x[0] === 0x00)
        x = x.slice(1);
    const buffer = Buffer.alloc(32, 0);
    const bstart = Math.max(0, 32 - x.length);
    x.copy(buffer, bstart);
    return buffer;
}
function decode(buffer) {
    const hashType = buffer.readUInt8(buffer.length - 1);
    const hashTypeMod = hashType & ~0xc0;
    if (hashTypeMod <= 0 || hashTypeMod >= 4)
        throw new Error('Invalid hashType ' + hashType);
    const decoded = bip66.decode(buffer.slice(0, -1));
    const r = fromDER(decoded.r);
    const s = fromDER(decoded.s);
    const signature = Buffer.concat([r, s], 64);
    return { signature, hashType };
}
exports.decode = decode;
function encode(signature, hashType) {
    typeforce({
        signature: types.BufferN(64),
        hashType: types.UInt8,
    }, { signature, hashType });
    const hashTypeMod = hashType & ~0xc0;
    if (hashTypeMod <= 0 || hashTypeMod >= 4)
        throw new Error('Invalid hashType ' + hashType);
    const hashTypeBuffer = Buffer.allocUnsafe(1);
    hashTypeBuffer.writeUInt8(hashType, 0);
    const r = toDER(signature.slice(0, 32));
    const s = toDER(signature.slice(32, 64));
    return Buffer.concat([bip66.encode(r, s), hashTypeBuffer]);
}
exports.encode = encode;
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