106 lines
3.0 KiB
TypeScript
106 lines
3.0 KiB
TypeScript
// 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.
|
|
|
|
import bech32 from "./bech32.js";
|
|
|
|
export default {
|
|
encode: encode,
|
|
decode: decode,
|
|
};
|
|
|
|
function convertbits(
|
|
data: any,
|
|
frombits: number,
|
|
tobits: number,
|
|
pad: boolean,
|
|
): any[] {
|
|
var acc = 0;
|
|
var bits = 0;
|
|
var ret = [];
|
|
var maxv = (1 << tobits) - 1;
|
|
for (var p = 0; p < data.length; ++p) {
|
|
var value = data[p];
|
|
if (value < 0 || value >> frombits !== 0) {
|
|
return []; //check this, was returning null
|
|
}
|
|
acc = (acc << frombits) | value;
|
|
bits += frombits;
|
|
while (bits >= tobits) {
|
|
bits -= tobits;
|
|
ret.push((acc >> bits) & maxv);
|
|
}
|
|
}
|
|
if (pad) {
|
|
if (bits > 0) {
|
|
ret.push((acc << (tobits - bits)) & maxv);
|
|
}
|
|
} else if (bits >= frombits || (acc << (tobits - bits)) & maxv) {
|
|
return []; //check this, was returning null
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
function decode(hrp: any, addr: string) {
|
|
var bech32m = false;
|
|
var dec = bech32.decode(addr, bech32.encodings.BECH32);
|
|
if (dec === null) {
|
|
dec = bech32.decode(addr, bech32.encodings.BECH32M);
|
|
bech32m = true;
|
|
}
|
|
if (
|
|
dec === null ||
|
|
dec.hrp !== hrp ||
|
|
dec.data.length < 1 ||
|
|
dec.data[0] > 16
|
|
) {
|
|
return null;
|
|
}
|
|
var res = convertbits(dec.data.slice(1), 5, 8, false);
|
|
if (res === null || res.length < 2 || res.length > 40) {
|
|
return null;
|
|
}
|
|
if (dec.data[0] === 0 && res.length !== 20 && res.length !== 32) {
|
|
return null;
|
|
}
|
|
if (dec.data[0] === 0 && bech32m) {
|
|
return null;
|
|
}
|
|
if (dec.data[0] !== 0 && !bech32m) {
|
|
return null;
|
|
}
|
|
return { version: dec.data[0], program: res };
|
|
}
|
|
|
|
function encode(hrp: any, version: number, program: any): string {
|
|
var enc = bech32.encodings.BECH32;
|
|
if (version > 0) {
|
|
enc = bech32.encodings.BECH32M;
|
|
}
|
|
var ret = bech32.encode(
|
|
hrp,
|
|
[version].concat(convertbits(program, 8, 5, true)),
|
|
enc,
|
|
);
|
|
if (decode(hrp, ret /*, enc*/) === null) {
|
|
return ""; //check this was returning null
|
|
}
|
|
return ret;
|
|
}
|