84 lines
2.5 KiB
JavaScript
84 lines
2.5 KiB
JavaScript
/*
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Copyright 2020 Kevin Froman
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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// version = 0.0.0
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class Block {
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constructor(meta, sig, signer, time, pow=0, c=0) {
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this.meta = meta
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this.sig = sig
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this.signer = signer
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this.time = time
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this.c = c
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}
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}
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let doHash = function(data){
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const shaObj = new jsSHA("SHA3-256", "UINT8ARRAY", { encoding: "UTF8" });
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shaObj.update(data)
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return shaObj.getHash("UINT8ARRAY");
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}
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let doHashHex = function(data){
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const shaObj = new jsSHA("SHA3-256", "UINT8ARRAY", { encoding: "UTF8" });
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shaObj.update(data)
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return shaObj.getHash("HEX");
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}
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function doPow(metadata, data, difficulty){
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// Inefficient single threaded proof of work. Accepting better implementations!
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var encoder = new TextEncoder("utf-8")
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if (typeof data == 'string'){
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data = encoder.encode(data)
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}
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metadata['c'] = 0
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metadata['n'] = Math.floor(Math.random() * Math.floor(10000)) + Math.floor(Math.random() * Math.floor(10000))
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while (true){
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var difficultyCounter = 0
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let metadataString = encoder.encode(JSON.stringify(metadata) + "\n")
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let arr = new Uint8Array(metadataString.length + data.length)
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arr.set(metadataString)
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arr.set(data, metadataString.length)
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hash = doHash(arr)
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for (var i = 0; i < hash.length; i++){
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if (hash[i] == 0){
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difficultyCounter += 1
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if (difficultyCounter === difficulty){
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return arr
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}
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}
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else{
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break
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}
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}
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metadata['c'] += 1
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}
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}
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function unserialize(str, theClass) {
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var instance = new theClass() // NOTE: if your constructor checks for unpassed arguments, then just pass dummy ones to prevent throwing an error
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var serializedObject = JSON.parse(str)
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Object.assign(instance, serializedObject)
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return instance
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}
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