With this example we are going to demonstrate how to make a SHA-1 hash function example. The Secure Hash Algorithm is a family of cryptographic functions. In short, to compute the hash value of a String with the SHA-1 algorithm, you should:
- Create a MessageDigest Object that implements the SHA-1 algorithm, using the
getInstance(String algorithm)API method. - Reset the MessageDigest for further use, using the
reset()API method. - Process a byte array encoded from the given string to the MessageDigest Object, using the
update(byte[] input)API method. - Computate the hash value of the byte array, using the
digest()API method,
as described in the encrypt(String x) method of the example below.
package com.javacodegeeks.snippets.core;
public class Main {
public static void main(String arg[]) throws Exception {
System.out.println(encrypt("JavaCodeGeeks"));
}
public static byte[] encrypt(String x) throws Exception {
java.security.MessageDigest digest = null;
digest = java.security.MessageDigest.getInstance("SHA-1");
digest.reset();
digest.update(x.getBytes("UTF-8"));
return digest.digest();
}
}
Output:
24fb3812e202e13e5f0666cc4f2e097b6422c1bf
This was an example of how to make an SHA-1 hash function example in Java.
its giving output like “[B@6d06d69c”.