Cracker.java

// Cracker.java
/*
 Generates SHA hashes of short strings in parallel.
*/

import java.security.*;

public class Cracker {
	// Array of chars used to produce strings
	public static final char[] CHARS = "abcdefghijklmnopqrstuvwxyz0123456789.,-!".toCharArray();
	
	
	/*
	 Given a byte[] array, produces a hex String,
	 such as "234a6f". with 2 chars for each byte in the array.
	 (provided code)
	*/
	public static String hexToString(byte[] bytes) {
		StringBuffer buff = new StringBuffer();
		for (int i=0; i<bytes.length; i++) {
			int val = bytes[i];
			val = val & 0xff;  // remove higher bits, sign
			if (val<16) buff.append('0'); // leading 0
			buff.append(Integer.toString(val, 16));
		}
		return buff.toString();
	}
	
	/*
	 Given a string of hex byte values such as "24a26f", creates
	 a byte[] array of those values, one byte value -128..127
	 for each 2 chars.
	 (provided code)
	*/
	public static byte[] hexToArray(String hex) {
		byte[] result = new byte[hex.length()/2];
		for (int i=0; i<hex.length(); i+=2) {
			result[i/2] = (byte) Integer.parseInt(hex.substring(i, i+2), 16);
		}
		return result;
	}
	
	
	
	public static void main(String[] args) {
		if (args.length < 2) {
			System.out.println("Args: target length [workers]");
			System.exit(1);
		}
		// args: targ len [num]
		String targ = args[0];
		int len = Integer.parseInt(args[1]);
		int num = 1;
		if (args.length>2) {
			num = Integer.parseInt(args[2]);
		}
		// a! 34800e15707fae815d7c90d49de44aca97e2d759
		// xyz 66b27417d37e024c46526c2f6d358a754fc552f3
		
		// YOUR CODE HERE
	}
}