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import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public final class HashExamples {
  private byte[] salt = "ia0942980234241sadfaewvo32".getBytes(); //Randomly generated

  private void setPassword(byte[] pass) throws Exception {
    byte[] input = appendArrays(pass, salt);
    MessageDigest sha_1 = MessageDigest.getInstance("SHA-1");
    byte[] hashVal = sha_1.digest(input); //encode the string and salt    
    clearArray(pass);    
    clearArray(input);    
    saveBytes(hashVal,"credentials.pw"); //save the hash value to credentials.pw
  }

  private boolean checkPassword(byte[] pass) throws Exception {
    byte[] input = appendArrays(pass, salt);
    MessageDigest sha_1 = MessageDigest.getInstance("SHA-1");
    byte[] hashVal1 = sha_1.digest(input); //encode the string and salt
    clearArray(pass);
    clearArray(input);
    byte[] hashVal2 = loadBytes("credentials.pw"); //load the hash value stored in credentials.pw
    return Arrays.equals(hashVal1, hashVal2);
  }

  private appendArrays(byte[] a, byte[] b) {
    //Return a new array of a appended to b
  }

  private clearArray(byte[] a) {
    //set all of the elements in a to zero
  }
}