@ecash/lib/dist/hmac.js

Library for eCash transaction building

"use strict";
// Copyright (c) 2025 The Bitcoin developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
Object.defineProperty(exports, "__esModule", { value: true });
exports.hmacSha512 = exports.hmacSha256 = exports.Hmac = void 0;
const hash_1 = require("./hash");
class Hmac {
    constructor(hashFactory, blockLength, key) {
        this.oHash = hashFactory();
        this.iHash = hashFactory();
        const pad = new Uint8Array(blockLength);
        if (key.length > blockLength) {
            const hasher = hashFactory();
            hasher.update(key);
            key = hasher.finalize();
        }
        pad.set(key, 0);
        for (let i = 0; i < pad.length; i++) {
            pad[i] ^= 0x36;
        }
        this.iHash.update(pad);
        for (let i = 0; i < pad.length; i++) {
            pad[i] ^= 0x36 ^ 0x5c;
        }
        this.oHash.update(pad);
        pad.fill(0);
    }
    update(data) {
        this.iHash.update(data);
    }
    digest() {
        this.oHash.update(this.iHash.finalize());
        const hash = this.oHash.finalize();
        this.iHash.free();
        this.oHash.free();
        return hash;
    }
    clone() {
        const clone = Object.create(Object.getPrototypeOf(this), {});
        clone.oHash = this.oHash.clone();
        clone.iHash = this.iHash.clone();
        return clone;
    }
    free() {
        this.iHash.free();
        this.oHash.free();
    }
}
exports.Hmac = Hmac;
function hmacSha256(key, data) {
    const hmac = new Hmac(hash_1.sha256Hasher, 64, key);
    hmac.update(data);
    return hmac.digest();
}
exports.hmacSha256 = hmacSha256;
function hmacSha512(key, data) {
    const hmac = new Hmac(hash_1.sha512Hasher, 128, key);
    hmac.update(data);
    return hmac.digest();
}
exports.hmacSha512 = hmacSha512;
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