SHA-512 Hash In Java



The SHA-2 family of cryptographic hash functions consists of six hash functions. These are:

  1. SHA-224, with 224 bit hash values
  2. SHA-256, with 256 bit hash values
  3. SHA-384, with 384 bit hash values
  4. SHA-512, with 512 bit hash values
  5. SHA-512/224, with 512 bit hash values
  6. SHA-512/256, with 512 bit hash values
  7. Among these, SHA-256 and SHA-512 are the most commonly accepted and used hash functions computed with 32-bit and 64-bit words, respectively. SHA-224 and SHA-384 are truncated versions of SHA-256 and SHA-512 respectively, computed with different initial values.

    To calculate cryptographic hashing value in Java, MessageDigest Class is used, under the package java.security.

    MessagDigest Class provides following cryptographic hash function to find hash value of a text as follows:

    • MD2
    • MD5
    • SHA-1
    • SHA-224
    • SHA-256
    • SHA-384
    • SHA-512

    These algorithms are initialized in static method called getInstance(). After selecting the algorithm the message digest value is calculated and the results is returned as byte array. BigInteger class is used, to convert the resultant byte array into its signum representation. This representation is then converted into hexadecimal format to get the expected MessageDigest.



    Examples:

    Input : hello world
    Output : 309ecc489c12d6eb4cc40f50c902f2b4d0ed77ee511a7c7a9bcd3ca86d4cd86f989dd35bc5ff499670da34255b45b0cfd830e81f605dcf7dc5542e93ae9cd76f

    Input : GeeksForGeeks
    Output : acc10c4e0b38617f59e88e49215e2e894afaee5ec948c2af6f44039f03c9fe47a9210e01d5cd926c142bdc9179c2ad30f927a8faf69421ff60a5eaddcf8cb9c

    Program: Below program shows the implementation of SHA-512 hash function:

    filter_none

    edit
    close

    play_arrow

    link
    brightness_4
    code

    // Java program to calculate SHA-512 hash value
      
    import java.math.BigInteger;
    import java.security.MessageDigest;
    import java.security.NoSuchAlgorithmException;
      
    public class GFG {
        public static String encryptThisString(String input)
        {
            try {
                // getInstance() method is called with algorithm SHA-512
                MessageDigest md = MessageDigest.getInstance("SHA-512");
      
                // digest() method is called
                // to calculate message digest of the input string
                // returned as array of byte
                byte[] messageDigest = md.digest(input.getBytes());
      
                // Convert byte array into signum representation
                BigInteger no = new BigInteger(1, messageDigest);
      
                // Convert message digest into hex value
                String hashtext = no.toString(16);
      
                // Add preceding 0s to make it 32 bit
                while (hashtext.length() < 32) {
                    hashtext = "0" + hashtext;
                }
      
                // return the HashText
                return hashtext;
            }
      
            // For specifying wrong message digest algorithms
            catch (NoSuchAlgorithmException e) {
                throw new RuntimeException(e);
            }
        }
      
        // Driver code
        public static void main(String args[]) throws NoSuchAlgorithmException
        {
      
            System.out.println("HashCode Generated by SHA-512 for: ");
      
            String s1 = "GeeksForGeeks";
            System.out.println("\n" + s1 + " : " + encryptThisString(s1));
      
            String s2 = "hello world";
            System.out.println("\n" + s2 + " : " + encryptThisString(s2));
        }
    }

    chevron_right

    
    

    Output:

    HashCode Generated by SHA-512 for: 
    
    GeeksForGeeks : acc10c4e0b38617f59e88e49215e2e894afaee5
    ec948c2af6f44039f03c9fe47a9210e01d5cd926c142bdc9179c2ad
    30f927a8faf69421ff60a5eaddcf8cb9c
    
    hello world : 309ecc489c12d6eb4cc40f50c902f2b4d0ed77ee5
    11a7c7a9bcd3ca86d4cd86f989dd35bc5ff499670da34255b45b0cf
    d830e81f605dcf7dc5542e93ae9cd76f
    

    Application:

    • Cryptography
    • Data Integrity


    My Personal Notes arrow_drop_up

    Technical Content Engineer

    If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

    Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.