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Date: Sun, 28 Oct 2012 16:03:33 +0530
From: Dhiru Kholia <>
Cc: Milen Rangelov <>
Subject: ssh_fmt / privkey without using high level OpenSSL functions


I tried to re-implement ssh / privkey format without using high level
OpenSSL functions. However I didn't get a speed-up over JtR's existing
ssh format :-(. Code is attached. Feel free to re-use it.

One advantage of my new code over existing JtR code is that it has no
multi-threading issues.


So far, I have only seen private keys using one of the following two
encryption algorithms,

        'AES-128-CBC': { 'cipher': AES, 'keysize': 16, 'blocksize':
16, 'mode': AES.MODE_CBC },
        'DES-EDE3-CBC': { 'cipher': DES3, 'keysize': 24, 'blocksize':
8, 'mode': DES3.MODE_CBC },

Let me know if you need corresponding fastssh2john program.


View attachment "fastssh_fmt_plug.c" of type "text/x-csrc" (7789 bytes)

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