Signing data with ssh-agent

This is follow-up to my previous post, Converting OpenSSH public keys.

OpenSSH allows one to use an agent that acts as a proxy to your private key. When using an agent -- particularly with agent forwarding enabled -- this allows you to authenticate to a remote host without having to (a) repeatedly ...

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Converting OpenSSH public keys

I've posted a followup to this article that discusses ssh-agent.

For reasons best left to another post, I wanted to convert an SSH public key into a PKCS#1 PEM-encoded public key. That is, I wanted to go from this:

ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQD7EZn/BzP26AWk/Ts2ymjpTXuXRiEWIWn
HFTilOTcuJ/P1HfOwiy4RHC1rv59Yh/E6jbTx623+OGySJWh1IS3dAEaHhcGKnJaikrBn3c
cdoNVkAAuL/YD7FMG1Z0SjtcZS6MoO8Lb9pkq6R ...
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Python ctypes module

Tue 10 August 2010 by Lars Kellogg-Stedman Tags python

I just learned about the Python ctypes module, which is a Python module for interfacing with C code. Among other things, ctypes lets you call arbitrary functions in shared libraries. This is, from my perspective, some very cool magic. I thought I would provide a short example here, since it ...

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Importing vCard contacts into an LG 420G

Fri 06 August 2010 by Lars Kellogg-Stedman Tags phone vcard sync contacts import

Alix recently acquired an LG 420G from TracFone. She was interested in getting all of her contacts onto the phone, which at first seemed like a simple task -- transfer a vCard (.vcf) file to the phone via Bluetooth, and the phone would import all the contacts. This turned out to ...

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Patch to gPXE dhcp command

Thu 22 July 2010 by Lars Kellogg-Stedman Tags gpxe linux dhcp

Update: This patch has been accepted into gPXE.

I just released a patch to gPXE that modifies the dhcp command so that it can iterate over multiple interfaces. The stock dhcp command only accepts a single interface as an argument, which can be a problem if you are trying to ...

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