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Date: Wed, 31 Oct 2012 20:12:07 +0530
From: Dhiru Kholia <>
Subject: Re: new fastssh format, please test and review

On Mon, Oct 29, 2012 at 8:44 PM, Dhiru Kholia <> wrote:
> By using the attached fastssh format, it is possible to get > 3X
> speedup over existing code (speedup is currently only for AES-128-CBC
> encrypted keys which are default these days on many systems).

I have now also accelerated cracking of keys which use 3DES encryption
(using same trick as used in AES).

Initial benchmarks were a bit conservative, new figures,

> 5X speedup for keys using 3DES encryption
> 4X speedup for keys using AES-128 encryption

(OMP results on AMD X3 720)

So far, I haven't been able to find false positives (although they can
occur) using the attached code.

It also cracks all CMIYC and ssh-key-collection.tar.bz2 files with no problems.


View attachment "fastssh_fmt_plug.c" of type "text/x-csrc" (20460 bytes)

Download attachment "" of type "application/octet-stream" (27032 bytes)

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