org.umlg.runtime.util.PasswordEncryptionService Maven / Gradle / Ivy
package org.umlg.runtime.util;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.util.Arrays;
/**
* Date: 2014/08/02
* Time: 7:00 PM
*/
public class PasswordEncryptionService {
public boolean authenticate(String attemptedPassword, byte[] encryptedPassword, byte[] salt)
throws NoSuchAlgorithmException, InvalidKeySpecException {
// Encrypt the clear-text password using the same salt that was used to
// encrypt the original password
byte[] encryptedAttemptedPassword = getEncryptedPassword(attemptedPassword, salt);
// Authentication succeeds if encrypted password that the user entered
// is equal to the stored hash
return Arrays.equals(encryptedPassword, encryptedAttemptedPassword);
}
public byte[] getEncryptedPassword(String password, byte[] salt)
throws NoSuchAlgorithmException, InvalidKeySpecException {
// PBKDF2 with SHA-1 as the hashing algorithm. Note that the NIST
// specifically names SHA-1 as an acceptable hashing algorithm for PBKDF2
String algorithm = "PBKDF2WithHmacSHA1";
// SHA-1 generates 160 bit hashes, so that's what makes sense here
int derivedKeyLength = 160;
// Pick an iteration count that works for you. The NIST recommends at
// least 1,000 iterations:
// http://csrc.nist.gov/publications/nistpubs/800-132/nist-sp800-132.pdf
// iOS 4.x reportedly uses 10,000:
// http://blog.crackpassword.com/2010/09/smartphone-forensics-cracking-blackberry-backup-passwords/
int iterations = 20000;
KeySpec spec = new PBEKeySpec(password.toCharArray(), salt, iterations, derivedKeyLength);
SecretKeyFactory f = SecretKeyFactory.getInstance(algorithm);
return f.generateSecret(spec).getEncoded();
}
public byte[] generateSalt() throws NoSuchAlgorithmException {
// VERY important to use SecureRandom instead of just Random
SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
// Generate a 8 byte (64 bit) salt as recommended by RSA PKCS5
byte[] salt = new byte[8];
random.nextBytes(salt);
return salt;
}
}