lycan/js/onionr-blocks.js

/*
    hush-hush: anonymous message board using the onionr network
    Copyright (C) 2020 Kevin Froman

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program 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 Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/
function reconstructHash(hash){
    return hash.padStart(64, 0)
}


function verifyBlock(raw, hash){
    var encoder = new TextEncoder("utf-8")
    hash = reconstructHash(hash)
    if (doHashHex(encoder.encode(raw)) != hash){
        throw new Error("Hash does not match")
    }
}

function verifyTime(time){
    let epoch = Math.round(Date.now() / 1000);
    if ((epoch - time) > maxBlockAge){
        throw new Error("Block is too old")
    }
}