Java MD5

-

 MD5 (Message-Digest algorithm 5) is a widely-used cryptographic hash function with a -bit hash value. Here are some common uses for MD5:

  • To store a one-way hash of a password.
  • To provide some assurance that a transferred file has arrived intact.

MD5 is one in a series of message digest algorithms designed by Professor Ronald Rivest of MIT (Rivest, ); however, the security of MD5 has been severely compromised, most infamously by the Flame malware in . The CMU Software Engineering Institute essentially considers MD5 to be "cryptographically broken and unsuitable for further use".

Given an alphanumeric string, , denoting a password, compute and print its MD5 encryption value.

Input Format

A single alphanumeric string denoting .

Constraints

  • String  consists of English alphabetic letters (i.e.,  and/or decimal digits (i.e.,  through ) only.

Output Format

Print the MD5 encryption value of  on a new line.

Sample Input 0

HelloWorld

Sample Output 0

68e109f0f40ca72a15e05cc22786f8e6

Sample Input 1

Javarmi123

Sample Output 1

2da2d1e0ce7b4951a858ed2d547ef485
SOLUTION:
import java.util.Scanner;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Solution {
    public static void main(String[] args) throws NoSuchAlgorithmException {
        /* Read and save the input String */
        Scanner scan = new Scanner(System.in);
        String str = scan.next();
        scan.close();
        
        /* Encode the String using MD5 */
        MessageDigest md = MessageDigest.getInstance("MD5");
        md.update(str.getBytes());
        byte[] digest = md.digest();
        
        /* Print the encoded value in hexadecimal */
        for (byte b : digest) {
            System.out.format("%02x", b);
        }
    }
}

Comments

Post a Comment

Popular posts from this blog

Valid Username Regular Expression

-
  You are updating the username policy on your company's internal networking platform. According to the policy, a username is considered valid if all the following constraints are satisfied: The username consists of   to   characters inclusive. If the username consists of less than   or greater than   characters, then it is an invalid username. The username can only contain alphanumeric characters and underscores ( _ ). Alphanumeric characters describe the character set consisting of  lowercase  characters  ,  uppercase  characters  , and digits  . The  first  character of the username must be an  alphabetic  character, i.e., either  lowercase  character   or  uppercase  character  . For example: Username Validity INVALID; Username length < 8 characters VALID VALID INVALID; Username begins with non-alphabetic character INVALID; '?' character not allow...
Read more

Java SHA-256

-
  Cryptographic hash functions are mathematical operations run on digital data; by comparing the computed   hash   (i.e., the output produced by executing a hashing algorithm) to a known and expected hash value, a person can determine the data's integrity. For example, computing the hash of a downloaded file and comparing the result to a previously published hash result can show whether the download has been modified or tampered with. In addition, cryptographic hash functions are extremely collision-resistant; in other words, it should be extremely difficult to produce the same hash output from two different input values using a cryptographic hash function. Secure Hash Algorithm 2  ( SHA-2 ) is a set of cryptographic hash functions designed by the National Security Agency (NSA). It consists of six identical hashing algorithms (i.e.,  SHA-256 ,  SHA-512 ,  SHA-224 ,  SHA-384 ,  SHA-512/224 ,  SHA-512/256 ) with a variable digest size....
Read more

Java Interface

-
  A Java interface can only contain method signatures and fields. The interface can be used to achieve polymorphism. In this problem, you will practice your knowledge on interfaces. You are given an interface  AdvancedArithmetic  which contains a method signature  int divisor_sum(int n) . You need to write a class called MyCalculator which implements the interface. divisorSum  function just takes an integer as input and return the sum of all its divisors. For example divisors of 6 are 1, 2, 3 and 6, so  divisor_sum  should return 12. The value of n will be at most 1000. Read the partially completed code in the editor and complete it. You just need to write the MyCalculator class only.  Your class shouldn't be public. Sample Input 6 Sample Output I implemented: AdvancedArithmetic 12 Explanation Divisors of 6 are 1,2,3 and 6. 1+2+3+6=12. SOLUTION: import  java . util .*; interface  AdvancedArithmetic {    int  divisor_sum ( ...
Read more