Using PuTTY ssh keys with OpenSSH on Ubuntu
Anyone who needs to access a unix/linux/osx machine from windows via ssh will be familiar with PuTTY, the free ssh client. PuTTYGen, available to download here, is a handy utility for creating RSA/DSA public/private keys for authentication. If you have generated your RSA keys using PuTTYGen, and would like to use them with OpenSSH on Ubuntu, you just need to follow a few simple steps:
- Install putty with:
sudo apt-get install putty - Create the public key file:
puttygen /path/to/puttykey.ppk -L > ~/.ssh/id_rsa.pub - Create the private key file:
puttygen /path/to/puttykey.ppk -O private-openssh -o ~/.ssh/id_rsa
You should now be able to log into an SSH server using your private key. To install your public key simply copy from ~/.ssh/id_rsa.pub on your local machine to ~/.ssh/authorized_keys on the remote server.
asioWavPlay for Matlab released
If you use Matlab for audio research / development, you’ll be familiar with the pretty poor native support for audio playback. As part of my research, I wanted to play multichannel (>2) files at a variety of sampling rates and bit depths. In addition, I also wanted to use a low-latency audio layer, such as ASIO, to take direct advantange of my audio hardware.
So, with a bit of coding I managed to put together a Matlab extension which allows for the playback of multichannel sound files using any soundcard with an ASIO driver. The plugin uses ASIO, PortAudio, and libsndfile. Samples are read from the audio file as needed, so playback start time is not dependant on the length of the file - useful in time-critical applications. Memory usage is also low because the whole file doesn’t need to be loaded into memory, only enough to fill the audio buffer.
You can download it over at the Matlab file exchange and the source is included under the GPL. Comments and suggestions welcome!
