Creating an MD5 String using Java
MD5 is a simple cryptographic hashing algorithm widely used for various application. In this tutorial im trying to generate MD5 value from a string and then compare it to mysql’s MD5 query result.
This is my java code to generate MD5, im using java’s MessageDigest.
package com.edw.util;
import java.security.MessageDigest;
import org.junit.Test;
/**
*
* @author edw
*/
public class MD5Test {
public MD5Test() {
}
public String hexStringFromBytes(byte[] b) {
char[] hexChars = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
String hex = "";
int msb;
int lsb = 0;
int i;
for (i = 0; i < b.length; i++) {
msb = ((int) b[i] & 0x000000FF) / 16;
lsb = ((int) b[i] & 0x000000FF) % 16;
hex = hex + hexChars[msb] + hexChars[lsb];
}
return hex;
}
@Test
public void testMD5() throws Exception {
MessageDigest digest = java.security.MessageDigest.getInstance("MD5");
// get md5 for word "PASSWORD"
digest.update("PASSWORD".getBytes());
byte[] passwordBytes = digest.digest();
// result = 319f4d26e3c536b5dd871bb2c52e3178
System.out.println(hexStringFromBytes(passwordBytes));
}
}
compared to mysql’s md5 function
you can see that MD5 strings generated by java and mysql are both the same.
(H)
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