@coolwallet/ltc/lib/utils/stringUtil.js

Coolwallet LiteCoin sdk

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.toDER = toDER;
exports.encodeDerSig = encodeDerSig;
exports.bip66Encode = bip66Encode;

var _core = require("@coolwallet/core");

var ZERO = Buffer.alloc(1, 0);

function toDER(x) {
  var 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 encodeDerSig(signature, hashType) {
  var r = toDER(signature.slice(0, 32));
  var s = toDER(signature.slice(32, 64));
  return Buffer.concat([bip66Encode(r, s), hashType]);
}

function bip66Encode(r, s) {
  var lenR = r.length;
  var lenS = s.length;
  if (lenR === 0) throw new _core.error.SDKError(bip66Encode.name, 'R length is zero');
  if (lenS === 0) throw new _core.error.SDKError(bip66Encode.name, 'S length is zero');
  if (lenR > 33) throw new _core.error.SDKError(bip66Encode.name, 'R length is too long');
  if (lenS > 33) throw new _core.error.SDKError(bip66Encode.name, 'S length is too long');
  if (r[0] & 0x80) throw new _core.error.SDKError(bip66Encode.name, 'R value is negative');
  if (s[0] & 0x80) throw new _core.error.SDKError(bip66Encode.name, 'S value is negative');
  if (lenR > 1 && r[0] === 0x00 && !(r[1] & 0x80)) throw new _core.error.SDKError(bip66Encode.name, 'R value excessively padded');
  if (lenS > 1 && s[0] === 0x00 && !(s[1] & 0x80)) throw new _core.error.SDKError(bip66Encode.name, 'S value excessively padded');
  var signature = Buffer.allocUnsafe(6 + lenR + lenS); // 0x30 [total-length] 0x02 [R-length] [R] 0x02 [S-length] [S]

  signature[0] = 0x30;
  signature[1] = signature.length - 2;
  signature[2] = 0x02;
  signature[3] = r.length;
  r.copy(signature, 4);
  signature[4 + lenR] = 0x02;
  signature[5 + lenR] = s.length;
  s.copy(signature, 6 + lenR);
  return signature;
}
//# 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