#About
This script is to automatically generate an AdBlockPlus site key for a given website.
#Script Overview
Creating an ABP site key consists of a 512 bit RSA key pair, and a string of site variables that is specific to the site the key is designed to work for.
In order, this script will generate a 512 bit RSA private key in PEM, extract a public key from it, and convert that public key into a DER representation. It will then take in a string and sign it with your private key. The string a concatenated list of request variables, and consists of the URI, host and user agent, each seperated by a NUL character.
Further details on ABP sitekeys can be found here: https://adblockplus.org/en/filters#sitekey_server
#Terminal Commands
Terminal commands to carry out the script are as follows:
To generate the initial private key, use the following command, where priv.pem is the name of the output file containing your private key.
openssl genrsa -out priv.pem 512
To generate a public key from this private key, use the following command, where pub.pem is the name of the output file to contain you public key.
openssl rsa -in priv.pem -pubout -out pub.pem
To convert your problic key from a PEM to a DER format, use the following command, where pub.der is the name of the output file containing the public key in the DER representation.
openssl rsa -inform PEM -outform DER -pubin -pubout -in pub.pem -out pub.der
To sign your string of request variables, use the following command. here, sig.sha is the output file containing your signed string, and string.txt is the input file containing the string that is to be signed.
openssl dgst -sign priv.pem -out sig.sha string.txt