63 lines
2.0 KiB
TypeScript
63 lines
2.0 KiB
TypeScript
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/*
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This file is part of GNU Taler
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(C) 2019 Taler Systems S.A.
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GNU Taler is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
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*/
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import { AmountJson } from "."
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import { Amounts, } from "./amounts"
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import { getRandomBytes, decodeCrock, encodeCrock } from "./talerCrypto"
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import { encode as segwitEncode } from "bech32-buffer"
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/**
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*
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* @author sebasjm
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*/
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export interface SegwitAddrs {
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segwitAddr1: string,
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segwitAddr2: string,
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}
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function buf2hex(buffer: Uint8Array) { // buffer is an ArrayBuffer
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return [...new Uint8Array(buffer)]
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.map(x => x.toString(16).padStart(2, '0'))
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.join('');
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}
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export function generateSegwitAddress(reservePub: string): SegwitAddrs {
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const pub = decodeCrock(reservePub)
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const first_rnd = getRandomBytes(4)
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const second_rnd = new Uint8Array(first_rnd.length)
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second_rnd.set(first_rnd)
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first_rnd[0] = first_rnd[0] & 0b0111_1111
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second_rnd[0] = second_rnd[0] | 0b1000_0000
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const first_part = new Uint8Array(first_rnd.length + pub.length / 2)
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first_part.set(first_rnd, 0)
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first_part.set(pub.subarray(0, 16), 4)
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const second_part = new Uint8Array(first_rnd.length + pub.length / 2)
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second_part.set(first_rnd, 0)
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second_part.set(pub.subarray(16, 32), 4)
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return {
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segwitAddr1: segwitEncode("bc", first_part),
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segwitAddr2: segwitEncode("bc", second_part),
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}
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}
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// https://github.com/bitcoin/bitcoin/blob/master/src/policy/policy.cpp
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export function segwitMinAmount(): AmountJson {
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return Amounts.parseOrThrow("BTC:0.00000294")
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}
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