Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
Decrypt class that uses RSAbreaker library (https://github.com/cybernova/RSAbreaker)
import java.math.BigInteger;
public class Decrypt {
/**
* @param args
*/
public static void main(String[] args) {
//master public key
String stringa = "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";
BigInteger key = RSAbreaker.hexToBigInteger(stringa);
//public exponent
String pex = "010001";
BigInteger exp = RSAbreaker.hexToBigInteger(pex);
//finding the private key
RSAbreaker.pollardRho(key, exp);
//plain text message
String messaggio = "000100ef21eee012947583";
BigInteger mex = RSAbreaker.hexToBigInteger(messaggio);
System.out.println(RSAbreaker.bigIntegerToHex(mex));
BigInteger result = mex.modPow(exp, key);
System.out.println(RSAbreaker.bigIntegerToHex(result));
//decrypting with the use of the private key found
BigInteger privkey = RSAbreaker.hexToBigInteger("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");
System.out.println(RSAbreaker.bigIntegerToHex(result.modPow(privkey, key)));
}
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.