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/*
This file is part of GNU Taler
(C) 2019 Taler Systems S.A.
GNU Taler is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
*
* @author sebasjm
*/
/**
* Imports.
*/
import { AmountJson, Amounts } from "./amounts.js";
import { decodeCrock } from "./taler-crypto.js";
import * as segwit from "./segwit_addr.js";
function buf2hex(buffer: Uint8Array) {
// buffer is an ArrayBuffer
return [...new Uint8Array(buffer)]
.map((x) => x.toString(16).padStart(2, "0"))
.join("");
}
const hext2buf = (hexString: string) =>
new Uint8Array(hexString.match(/.{1,2}/g)!.map((byte) => parseInt(byte, 16)));
export function generateFakeSegwitAddress(
reservePub: string | undefined,
addr: string,
): string[] {
if (!reservePub) return [];
let pub;
try {
pub = decodeCrock(reservePub);
} catch {
// pub = new Uint8Array(0)
}
if (!pub || pub.length !== 32) return [];
const first_rnd = new Uint8Array(4);
first_rnd.set(pub.subarray(0, 4));
const second_rnd = new Uint8Array(4);
second_rnd.set(pub.subarray(0, 4));
first_rnd[0] = first_rnd[0] & 0b0111_1111;
second_rnd[0] = second_rnd[0] | 0b1000_0000;
const first_part = new Uint8Array(first_rnd.length + pub.length / 2);
first_part.set(first_rnd, 0);
first_part.set(pub.subarray(0, 16), 4);
const second_part = new Uint8Array(first_rnd.length + pub.length / 2);
second_part.set(second_rnd, 0);
second_part.set(pub.subarray(16, 32), 4);
const prefix =
addr[0] === "t" && addr[1] == "b"
? "tb"
: addr[0] === "b" && addr[1] == "c" && addr[2] === "r" && addr[3] == "t"
? "bcrt"
: addr[0] === "b" && addr[1] == "c"
? "bc"
: undefined;
if (prefix === undefined) throw new Error("unknown bitcoin net");
const addr1 = segwit.default.encode(prefix, 0, first_part);
const addr2 = segwit.default.encode(prefix, 0, second_part);
return [addr1, addr2];
}
// https://github.com/bitcoin/bitcoin/blob/master/src/policy/policy.cpp
export function segwitMinAmount(currency: string): AmountJson {
return Amounts.parseOrThrow(`${currency}:0.00000294`);
}
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