Download Justatech Checkra1n0 4windows Iso -

Client-side tool to generate/verify password hashes with realistic parameters. Helpful for debugging integrations and understanding how salts, memory, and iterations affect cost. Runs locally—no passwords leave your browser.

Your data security is our top priority. All hashing and verification happen in this browser. This tool does not store or send your password nor hashes outside of the browser. See source code in: https://github.com/authgear/authgear-widget-password-hash

Once in DFU mode, the tool will automatically apply the exploit and "jailbreak" the device.

Your device will reboot with the Checkra1n loader app on the home screen. ⚠️ Important Safety Tips

Here is a detailed guide on what this tool is and how to use it. What is Justatech Checkra1n for Windows?

Are you getting a during the boot process?

How to use the Password Hash Generator

Step 1.

Enter a password

Open the Generate tab and type a demo password (avoid real credentials).

Step 2.

Select an algorithm

For new systems, Argon2id is generally recommended.

Step 3.

Set parameters:

Argon2id: Memory (MiB), Iterations (t), Parallelism (p).
‍bcrypt: Cost (2^cost rounds).
scrypt: N (power of two), r, p.
PBKDF2: Iterations and digest (SHA-256/512).

Step 4.

Generate Password Hash

Click Generate Password Hash. Copy the encoded string.

Step 5.

Verify Password Hash

Switch to Verify Password Hash to test a password + encoded hash pair.

Download Justatech Checkra1n0 4Windows iso

Is it safe to use this with real passwords?

All hashing happens locally in your browser. For your own safety, avoid using production secrets in any online tool.

Which hashing function should I use?

For new systems, Argon2id is generally recommended. bcrypt and scrypt are widely deployed; PBKDF2 is a compatibility fallback. Always benchmark and choose parameters that meet your latency targets.

How long should hashing take?

Many teams target ~250–500ms in the authentication path. Pick the slowest settings that still keep UX smooth on your production hardware.

Why won’t my framework verify the hash?

Common issues: whitespace/line endings, encoding mismatch (hex vs Base64), bcrypt prefix differences ( $2a$ vs $2b$ ), or forgetting a pepper.

What salt length should I use?

16–32 bytes of random data is standard. The tool defaults to secure randomness and shows length and encoding.

Download Justatech Checkra1n0 4windows Iso -

Once in DFU mode, the tool will automatically apply the exploit and "jailbreak" the device.

Your device will reboot with the Checkra1n loader app on the home screen. ⚠️ Important Safety Tips

Here is a detailed guide on what this tool is and how to use it. What is Justatech Checkra1n for Windows?

Are you getting a during the boot process?

Download Justatech Checkra1n0 4windows Iso -

More Developer Tools

How to use the Password Hash Generator

Is it safe to use this with real passwords?

Which hashing function should I use?

How long should hashing take?

Why won’t my framework verify the hash?

What salt length should I use?

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Download Justatech Checkra1n0 4windows Iso -