Scallion – GPU Based Onion Hash Generator


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

You can download Scallion here:

scallion-gpg.zip

Or read more here.

Posted in: Cryptography


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