mirror of
https://github.com/pezkuwichain/pezkuwi-common.git
synced 2026-04-22 18:28:02 +00:00
49 lines
1.8 KiB
JavaScript
49 lines
1.8 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.secp256k1PrivateKeyTweakAdd = secp256k1PrivateKeyTweakAdd;
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const util_1 = require("@pezkuwi/util");
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const x_bigint_1 = require("@pezkuwi/x-bigint");
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const bn_js_1 = require("../bn.js");
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const N = 'ffffffff ffffffff ffffffff fffffffe baaedce6 af48a03b bfd25e8c d0364141'.replace(/ /g, '');
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const N_BI = (0, x_bigint_1.BigInt)(`0x${N}`);
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const N_BN = new util_1.BN(N, 'hex');
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function addBi(seckey, tweak) {
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let res = (0, util_1.u8aToBigInt)(tweak, bn_js_1.BN_BE_OPTS);
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if (res >= N_BI) {
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throw new Error('Tweak parameter is out of range');
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}
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res += (0, util_1.u8aToBigInt)(seckey, bn_js_1.BN_BE_OPTS);
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if (res >= N_BI) {
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res -= N_BI;
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}
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if (res === util_1._0n) {
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throw new Error('Invalid resulting private key');
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}
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return (0, util_1.nToU8a)(res, bn_js_1.BN_BE_256_OPTS);
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}
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function addBn(seckey, tweak) {
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const res = new util_1.BN(tweak);
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if (res.cmp(N_BN) >= 0) {
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throw new Error('Tweak parameter is out of range');
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}
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res.iadd(new util_1.BN(seckey));
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if (res.cmp(N_BN) >= 0) {
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res.isub(N_BN);
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}
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if (res.isZero()) {
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throw new Error('Invalid resulting private key');
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}
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return (0, util_1.bnToU8a)(res, bn_js_1.BN_BE_256_OPTS);
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}
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function secp256k1PrivateKeyTweakAdd(seckey, tweak, onlyBn) {
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if (!(0, util_1.isU8a)(seckey) || seckey.length !== 32) {
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throw new Error('Expected seckey to be an Uint8Array with length 32');
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}
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else if (!(0, util_1.isU8a)(tweak) || tweak.length !== 32) {
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throw new Error('Expected tweak to be an Uint8Array with length 32');
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}
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return !util_1.hasBigInt || onlyBn
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? addBn(seckey, tweak)
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: addBi(seckey, tweak);
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}
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