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Scallion – GPU Based Onion Hash Generator

January 10, 2020

Views: 4,678

Scallion is a GPU-driven Onion Hash Generator written in C#, it lets you create vanity GPG keys and .onion addresses (for Tor’s hidden services) using OpenCL.

Scallion - GPU Based Onion Hash Generator

Scallion runs on Mono (tested in Arch Linux) and .NET 3.5+ (tested on Windows 7 and Server 2008)

Scallion was used to find collisions for every 32bit key id in the Web of Trust’s strong set demonstrating how insecure 32bit key ids are.

At a high level Scallion works as follows:

  1. Generate RSA key using OpenSSL on the CPU
  2. Send the key to the GPU
  3. Increase the key’s public exponent
  4. Hash the key
  5. If the hashed key is not a partial collision go to step 3
  6. If the key does not pass the sanity checks recommended by PKCS #1 v2.1 (checked on the CPU) go to step 3
  7. Brand new key with partial collision!

The basic algorithm is described above. Speed/performance is the result of massive parallelization, both on the GPU and the CPU.

Dependencies for Onion Hash Generator

To run Scallion successfully you need:

  • OpenCL and relevant drivers installed and configured. Refer to your distribution’s documentation.
  • OpenSSL. For Windows, the prebuilt x86 DLLs are included
  • On windows only, VC++ Redistributable 2008

Scallion runs on Mono (tested in Arch Linux) and .NET 3.5+ (tested on Windows 7 and Server 2008).

Scallion Usage Onion Hash Generator

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$ mono scallion/bin/Debug/scallion.exe -d 0 prefix
Cooking up some delicious scallions...
Using kernel optimized from file kernel.cl (Optimized4)
Using work group size 128
Compiling kernel... done.
Testing SHA1 hash...
CPU SHA-1: d3486ae9136e7856bc42212385ea797094475802
GPU SHA-1: d3486ae9136e7856bc42212385ea797094475802
Looks good!
LoopIteration:40  HashCount:671.09MH  Speed:9.5MH/s  Runtime:00:01:10  Predicted:00:00:56  Found new key! Found 1 unique keys.
<XmlMatchOutput>
  <GeneratedDate>2014-08-05T07:14:50.329955Z</GeneratedDate>
  <Hash>prefix64kxpwmzdz.onion</Hash>
  <PrivateKey>-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
</PrivateKey>
  <PublicModulusBytes>pmJk58BjgqbDzqr7OZmUGyDNU06jhyta+sxr6ZOtWWk+89gQhBT73U3ZGeLUN//ebn44T8exFQ43ifyVG09EAFv2H5c1HxSbgZYtCdnlCc4YYh6Qv9Xd62+lIZ8L798Up3xvJuy3iPwKNxS7cmRYBmT8LMNwWWMiZ97A9ZiSCa0=</PublicModulusBytes>
  <PublicExponentBytes>B/ZPZw==</PublicExponentBytes>
</XmlMatchOutput>
init: 491ms / 1 (491ms, 2.04/s)
generate key: 1193ms / 6 (198.83ms, 5.03/s)
cpu precompute: 10ms / 6 (1.67ms, 600/s)
total without init: 70640ms / 1 (70640ms, 0.01/s)
set buffers: 0ms / 40 (0ms, 0/s)
write buffers: 3ms / 40 (0.08ms, 13333.33/s)
read results: 67442ms / 40 (1686.05ms, 0.59/s)
check results: 185ms / 40 (4.63ms, 216.22/s)
 
9.50 million hashes per second
 
Stopping the GPU and shutting down...

You can download Scallion here:

scallion-gpg.zip

Or read more here.

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Filed Under: Cryptography



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