Initial commit.

This commit is contained in:
libroot 2025-08-06 16:58:36 +00:00
commit 0a9434be1b
18 changed files with 1860 additions and 0 deletions

5
server/go-http/README.md Normal file
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NOJSCAP Go server example with net/http + html/template.
# Running
go run server.go

175
server/go-http/server.go Normal file
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package main
import (
"crypto/rand"
"crypto/sha256"
"encoding/hex"
"fmt"
"html/template"
"log"
"net/http"
"strconv"
"sync"
"time"
)
const (
port = 3000
difficulty = 20
)
var (
challengeStore = make(map[string]time.Time)
storeMutex sync.Mutex
)
func generateChallenge() string {
b := make([]byte, 12)
_, err := rand.Read(b)
if err != nil {
panic(err)
}
return hex.EncodeToString(b)
}
func checkDifficulty(hash []byte, bits int) bool {
i := 0
for bits > 0 {
b := hash[i]
if bits >= 8 {
if b != 0 {
return false
}
bits -= 8
} else {
mask := byte(0xFF << (8 - bits))
if b&mask != 0 {
return false
}
bits = 0
}
i++
}
return true
}
func indexHandler(w http.ResponseWriter, r *http.Request) {
challenge := generateChallenge()
storeMutex.Lock()
challengeStore[challenge] = time.Now()
storeMutex.Unlock()
tmpl.Execute(w, map[string]string{
"Challenge": challenge,
"Difficulty": strconv.Itoa(difficulty),
})
}
func postHandler(w http.ResponseWriter, r *http.Request) {
challenge := r.FormValue("challenge")
nonce := r.FormValue("nonce")
storeMutex.Lock()
_, ok := challengeStore[challenge]
if ok {
delete(challengeStore, challenge)
}
storeMutex.Unlock()
if !ok {
fmt.Fprint(w, "<p>Invalid challenge.</p><a href='/'>Try again</a>")
return
}
hash := sha256.Sum256([]byte(challenge + nonce))
if checkDifficulty(hash[:], difficulty) {
fmt.Fprint(w, "<p>Success! Valid nonce.</p><a href='/'>Try again</a>")
} else {
fmt.Fprint(w, "<p>Invalid nonce.</p><a href='/'>Try again</a>")
}
}
var tmpl = template.Must(template.New("page").Parse(`
<!doctype html>
<html lang="en">
<head>
<title>NOJSCAP demo</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
body {
padding: 20px;
margin-bottom: 300px;
background: #cacaca;
color: black;
}
code {
white-space: break-spaces;
background: black;
color: white;
padding: 10px;
display: block;
max-width: 500px;
}
.h {
font-size: 21px;
font-weight: bolder;
width: 100%;
float: left;
}
button {
background: #006ed0;
color: white;
border: 1px solid #006ed0;
padding: 10px 20px;
margin-top: 10px;
}
input {
background: black;
color: white;
padding: 10px;
display: block;
max-width: 500px;
width: 100%;
border: 0px solid transparent;
font-family: monospace;
font-size: 12px;
}
</style>
</head>
<body>
<h1>NOJSCAP demo</h1>
<p><a href="https://git.libroot.org/libroot/NOJSCAP/" target="_blank">https://git.libroot.org/libroot/NOJSCAP/</a></p>
<p>If you don't already have the <b><em>NOJSCAP</em></b> client:</p>
<code>$ git clone https://git.libroot.org/libroot/NOJSCAP/$ cd NOJSCAP/client/</code>
<p><code>$ python3 pow_client.py {{.Challenge}} {{.Difficulty}}</code></p>
<p><strong>Go:</strong></p>
<p><code>$ go run pow_client.go {{.Challenge}} {{.Difficulty}}</code></p>
<p><strong>Node.js:</strong></p>
<p><code>$ node pow_client.js {{.Challenge}} {{.Difficulty}}</code></p>
<p><strong>Rust:</strong></p>
<p><code>$ rustc pow_client.rs -o pow_client_rs$ pow_client_rs {{.Challenge}} {{.Difficulty}}</code></p>
<p><strong>C:</strong></p>
<p><code>$ gcc -O2 -o pow_client pow_client.c -lssl -lcrypto$ ./pow_client {{.Challenge}} {{.Difficulty}}</code></p>
<form method="POST">
<input type="hidden" name="challenge" value="{{.Challenge}}">
<label class="h">Nonce: <input name="nonce"></label>
<button type="submit">Submit</button>
</form>
</body>
</html>
`))
func main() {
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
if r.Method == http.MethodPost {
postHandler(w, r)
} else {
indexHandler(w, r)
}
})
fmt.Printf("Running on http://localhost:%d\n", port)
log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", port), nil))
}

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NOJSCAP Python server example with Flask.
# Running
python3 server.py

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from flask import Flask, request
import hashlib, os, time
app = Flask(__name__)
DIFFICULTY = 20
challenge_store = {}
def generate_challenge():
return os.urandom(12).hex()
def check_difficulty(hash_bytes, bits):
i = 0
while bits > 0:
byte = hash_bytes[i]
if bits >= 8:
if byte != 0: return False
bits -= 8
else:
if byte & (0xFF << (8 - bits)) != 0: return False
bits = 0
i += 1
return True
@app.route('/', methods=['GET'])
def index():
challenge = generate_challenge()
challenge_store[challenge] = time.time()
return f'''
<!doctype html>
<html lang="en">
<head>
<title>NOJSCAP demo</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
body {{
padding: 20px;
margin-bottom: 300px;
background: #cacaca;
color: black;
}}
code {{
white-space: break-spaces;
background: black;
color: white;
padding: 10px;
display: block;
max-width: 500px;
}}
.h {{
font-size: 21px;
font-weight: bolder;
width: 100%;
float: left;
}}
button {{
background: #006ed0;
color: white;
border: 1px solid #006ed0;
padding: 10px 20px;
margin-top: 10px;
}}
input {{
background: black;
color: white;
padding: 10px;
display: block;
max-width: 500px;
width: 100%;
border: 0px solid transparent;
font-family: monospace;
font-size: 12px;
}}
</style>
</head>
<body>
<h1>NOJSCAP demo</h1>
<p><a href="https://git.libroot.org/libroot/NOJSCAP/" target="_blank">https://git.libroot.org/libroot/NOJSCAP/</a></p><p><br></p>
<p>If you don't already have the <b><em>NOJSCAP</em></b> client:</p>
<code>$ git clone https://git.libroot.org/libroot/NOJSCAP/
$ cd NOJSCAP/client/</code>
<p><br></p>
<p>
<code>$ python3 pow_client.py {challenge} {DIFFICULTY}</code>
</p>
<p>
<strong>Go:</strong>
</p>
<p>
<code>$ go run pow_client.go {challenge} {DIFFICULTY}</code>
</p>
<p>
<strong>Node.js:</strong>
</p>
<p>
<code>$ node pow_client.js {challenge} {DIFFICULTY}</code>
</p>
<p>
<strong>Rust:</strong>
</p>
<p>
<code>$ rustc pow_client.rs -o pow_client_rs
$ pow_client_rs {challenge} {DIFFICULTY}
</code>
<small>Requires Rust and sha2 crate if using the Cargo version.</small>
</p>
<p>
<strong>C:</strong>
</p>
<p>
<code>$ gcc -O2 -o pow_client pow_client.c -lssl -lcrypto
$ ./pow_client {challenge} {DIFFICULTY}
</code>
<small>Required: GCC or any C compiler. OpenSSL development libraries (libssl-dev on Debian-based systems)</small>
</p>
<form method="POST">
<input type="hidden" name="challenge" value="{challenge}">
<label class="h">Nonce: <input name="nonce"></label>
<button type="submit">Submit</button>
</form>
</body>
</html>
'''
@app.route('/', methods=['POST'])
def submit():
challenge = request.form.get("challenge")
nonce = request.form.get("nonce")
if challenge not in challenge_store: return "Invalid challenge"
challenge_store.pop(challenge)
combined = (challenge + nonce).encode()
h = hashlib.sha256(combined).digest()
return "<p>Success! Valid nonce.</p><a href='/'>Try again</a>" if check_difficulty(h, DIFFICULTY) else "<p>Invalid nonce.</p><a href='/'>Try again</a>"
app.run(port=3000)

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node_modules/

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NOJSCAP TypeScript server example with Express.
# Running
npm install
npx tsx server.ts

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server/ts-express/package-lock.json generated Normal file
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}
}

View file

@ -0,0 +1,16 @@
{
"name": "NOJSCAP server",
"type": "module",
"version": "1.0.0",
"description": "",
"main": "server.ts",
"scripts": {
"start": "npx tsx server.ts"
},
"keywords": [],
"author": "",
"license": "ISC",
"dependencies": {
"express": "^5.1.0"
}
}

154
server/ts-express/server.ts Normal file
View file

@ -0,0 +1,154 @@
import express, { Request, Response } from 'express';
import crypto from 'crypto';
const app = express();
app.use(express.urlencoded({ extended: false }));
const DIFFICULTY = 20;
const challengeStore = new Map<string, number>();
function generateChallenge(): string {
return crypto.randomBytes(12).toString('hex');
}
function hashSha256(input: string): Buffer {
return crypto.createHash('sha256').update(input).digest();
}
function checkDifficulty(hash: Buffer, bits: number): boolean {
let remaining = bits, i = 0;
while (remaining > 0 && i < hash.length) {
const byte = hash[i];
if (remaining >= 8) {
if (byte !== 0) return false;
remaining -= 8;
} else {
const mask = 0xFF << (8 - remaining);
if ((byte & mask) !== 0) return false;
break;
}
i++;
}
return true;
}
app.get('/', (_req: Request, res: Response) => {
const challenge = generateChallenge();
challengeStore.set(challenge, Date.now());
res.send(`
<!doctype html>
<html lang="en">
<head>
<title>POWOW POC</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
body {
padding: 20px;
margin-bottom: 300px;
background: #cacaca;
color: black;
}
code {
white-space: break-spaces;
background: black;
color: white;
padding: 10px;
display: block;
max-width: 500px;
}
.h {
font-size: 21px;
font-weight: bolder;
width: 100%;
float: left;
}
button {
background: #006ed0;
color: white;
border: 1px solid #006ed0;
padding: 10px 20px;
margin-top: 10px;
}
input {
background: black;
color: white;
padding: 10px;
display: block;
max-width: 500px;
width: 100%;
border: 0px solid transparent;
font-family: monospace;
font-size: 12px;
}
</style>
</head>
<body>
<h1>NOJSCAP demo</h1>
<p><a href="https://git.libroot.org/libroot/NOJSCAP/" target="_blank">https://git.libroot.org/libroot/NOJSCAP/</a></p><p><br></p>
<p>If you don't already have the <b><em>NOJSCAP</em></b> client:</p>
<code>$ git clone https://git.libroot.org/libroot/NOJSCAP/
$ cd NOJSCAP/client/</code>
<p><br></p>
<p>
<strong>Python:</strong>
</p>
<p>
<input type="text" value="python3 pow_client.py ${challenge} ${DIFFICULTY}">
</p>
<p>
<strong>Go:</strong>
</p>
<p>
<input type="text" value="go run pow_client.go ${challenge} ${DIFFICULTY}">
</p>
<p>
<strong>Node.js:</strong>
</p>
<p>
<input type="text" value="node pow_client.js ${challenge} ${DIFFICULTY}">
</p>
<p>
<strong>Rust:</strong>
</p>
<p>
<details><summary>Show compilation commands</summary><code>$ rustc pow_client.rs -o pow_client_rs</code>
<small>Requires Rust and sha2 crate if using the Cargo version.</small><br></details>
<input type="text" value="pow_client_rs ${challenge} ${DIFFICULTY}">
</p>
<p>
<strong>C:</strong>
</p>
<p>
<details><summary>Show compilation commands</summary><code>$ gcc -O2 -o pow_client pow_client.c -lssl -lcrypto</code>
<small>Required: GCC or any C compiler. OpenSSL development libraries (libssl-dev on Debian-based systems)</small><br></details>
<input type="text" value="./pow_client ${challenge} ${DIFFICULTY}">
</p>
<form method="POST">
<input type="hidden" name="challenge" value="${challenge}">
<label class="h">Enter found nonce: <input name="nonce"></label>
<button type="submit">Submit</button>
</form>
</body>
</html>
`);
});
app.post('/', (req: Request, res: Response) => {
const { challenge, nonce } = req.body as { challenge?: string; nonce?: string };
if (!challenge || !nonce || !challengeStore.has(challenge)) {
return res.send('Invalid input.');
}
challengeStore.delete(challenge);
const hash = hashSha256(challenge + nonce);
if (checkDifficulty(hash, DIFFICULTY)) {
res.send('<p>Success! Valid nonce.</p><a href="/">Try again</a>');
} else {
res.send('<p>Invalid nonce.</p><a href="/">Try again</a>');
}
});
app.listen(3000, () => console.log('Server running at http://localhost:3000'));