@dartess/multicoin-address-validator
Version:
Multicoin address validator for Bitcoin and other Altcoins ported to TypeScript.
130 lines • 4.43 kB
JavaScript
;
/* eslint-disable no-param-reassign */
Object.defineProperty(exports, "__esModule", { value: true });
exports.bech32 = void 0;
// Copyright (c) 2017, 2021 Pieter Wuille
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// Ported to TypeScript by Sergey Kozlov
const CHARSET = 'qpzry9x8gf2tvdw0s3jn54khce6mua7l';
const GENERATOR = [0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3];
const encodings = {
BECH32: 'bech32',
BECH32M: 'bech32m',
};
const encodingConsts = {
[encodings.BECH32]: 1,
[encodings.BECH32M]: 0x2bc830a3,
};
function getEncodingConst(enc) {
if (enc in encodingConsts) {
return encodingConsts[enc];
}
throw new Error(`Unsupported encoding: ${enc}`);
}
function polymod(values) {
let chk = 1;
for (let p = 0; p < values.length; ++p) {
const top = chk >> 25;
chk = (chk & 0x1ffffff) << 5 ^ values[p];
for (let i = 0; i < 5; ++i) {
if ((top >> i) & 1) {
chk ^= GENERATOR[i];
}
}
}
return chk;
}
function hrpExpand(hrp) {
const ret = [];
let p;
for (p = 0; p < hrp.length; ++p) {
ret.push(hrp.charCodeAt(p) >> 5);
}
ret.push(0);
for (p = 0; p < hrp.length; ++p) {
ret.push(hrp.charCodeAt(p) & 31);
}
return ret;
}
function verifyChecksum(hrp, data, enc) {
return polymod(hrpExpand(hrp).concat(data)) === getEncodingConst(enc);
}
function createChecksum(hrp, data, enc) {
const values = hrpExpand(hrp).concat(data).concat([0, 0, 0, 0, 0, 0]);
const mod = polymod(values) ^ getEncodingConst(enc);
const ret = [];
for (let p = 0; p < 6; ++p) {
ret.push((mod >> 5 * (5 - p)) & 31);
}
return ret;
}
function encode(hrp, data, enc) {
const combined = data.concat(createChecksum(hrp, data, enc));
let ret = `${hrp}1`;
for (let p = 0; p < combined.length; ++p) {
ret += CHARSET.charAt(combined[p]);
}
return ret;
}
function decode(bechString, enc) {
let p;
let has_lower = false;
let has_upper = false;
for (p = 0; p < bechString.length; ++p) {
if (bechString.charCodeAt(p) < 33 || bechString.charCodeAt(p) > 126) {
return null;
}
if (bechString.charCodeAt(p) >= 97 && bechString.charCodeAt(p) <= 122) {
has_lower = true;
}
if (bechString.charCodeAt(p) >= 65 && bechString.charCodeAt(p) <= 90) {
has_upper = true;
}
}
if (has_lower && has_upper) {
return null;
}
bechString = bechString.toLowerCase();
const pos = bechString.lastIndexOf('1');
if (pos < 1 || pos + 7 > bechString.length || bechString.length > 110) {
return null;
}
const hrp = bechString.substring(0, pos);
const data = [];
for (p = pos + 1; p < bechString.length; ++p) {
const d = CHARSET.indexOf(bechString.charAt(p));
if (d === -1) {
return null;
}
data.push(d);
}
if (!verifyChecksum(hrp, data, enc)) {
return null;
}
return { hrp, data: data.slice(0, data.length - 6) };
}
const bech32 = {
decode,
encode,
encodings,
verifyChecksum,
};
exports.bech32 = bech32;
//# sourceMappingURL=bech32.js.map