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Pagerank Checksum in Java

October 11th, 2006

A quick java class to calculate a web pages Page Rank Checksum. It can be used to obtian the Google Page Rank for a given url.The code is reverse engineered from the javascript used to build the Firefox page rank plugin. It calculates a checksum using a encoding algorithm.

[java]

public class Pagerank
{

private String toHex8(int num)
{
if(num<16) return "0"+Integer.toHexString(num);
else return Integer.toHexString(num);

}

public String calculateChecksum(String url)
{
String stupidGoogleHash = "Mining PageRank is AGAINST GOOGLE’S TERMS OF SERVICE. Yes, I’m talking to you, scammer.";
int key = 16909125;

for(int i=0; i < url.length(); i++) {

key = key ^ (int)(stupidGoogleHash.charAt(i%stupidGoogleHash.length()))^(int)(url.charAt(i));
key = key>>>23|key<<9;

}return "8"+toHex8(key>>>(8&255))+toHex8(key&255);

}
}[/java]

Tags: Java