Reliable implementation of PBKDF2-HMAC-SHA256 for JAVA

26
votes

UPDATED 2019: Bouncycastle now support PBKDF2-HMAC-SHA256 since bouncycastle 1.60

Is there any reliable implementation of PBKDF2-HMAC-SHA256 for JAVA?

I used to encrypt using bouncycastle but it does not provide PBKDF2WithHmacSHA256'.

I do not want to write crypto module by myself.

Could you recommend any alternative library or algorithm (if i can stick with bouncycastle)

(here are the algorithms that bouncycastle supports) http://www.bouncycastle.org/specifications.html

3
javacryptographybouncycastlepbkdf2
stackoverflow.com/questions/9147463/… – Konstantin V. Salikhov
@KonstantinV.Salikhov I already read but it's hard to believe that it is fully proven. And if i use that, I have to implement code for Jasypt API – dgregory
Future readers : see mkyong.com/java/java-aes-encryption-and-decryption – granadaCoder

3 Answers

39
votes

Using BouncyCastle classes directly:

PKCS5S2ParametersGenerator gen = new PKCS5S2ParametersGenerator(new SHA256Digest());
gen.init("password".getBytes("UTF-8"), "salt".getBytes(), 4096);
byte[] dk = ((KeyParameter) gen.generateDerivedParameters(256)).getKey();
33
votes

It is available in Java 8: 

public static byte[] getEncryptedPassword(
                                         String password,
                                         byte[] salt,
                                         int iterations,
                                         int derivedKeyLength
                                         ) throws NoSuchAlgorithmException, InvalidKeySpecException {
    KeySpec spec = new PBEKeySpec(
                                 password.toCharArray(),
                                 salt,
                                 iterations,
                                 derivedKeyLength * 8
                                 );

    SecretKeyFactory f = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");

    return f.generateSecret(spec).getEncoded();
}
2
votes

Using spongycastle (java on android)

Replace spongycastle with bouncycastle if you are using bouncycastle on java directly

import org.spongycastle.crypto.generators.PKCS5S2ParametersGenerator;
import org.spongycastle.crypto.digests.SHA256Digest;
import org.spongycastle.crypto.params.KeyParameter;

public class Crypto {
    public String pbkdf2(String secret, String salt, int iterations, int keyLength) {
        PKCS5S2ParametersGenerator gen = new PKCS5S2ParametersGenerator(new SHA256Digest());
        byte[] secretData = secret.getBytes();
        byte[] saltData = salt.getBytes();
        gen.init(secretData, saltData, iterations);
        byte[] derivedKey = ((KeyParameter)gen.generateDerivedParameters(keyLength * 8)).getKey();    
        return toHex(derivedKey);
    }

    private static String toHex(byte[] bytes) {
        BigInteger bi = new BigInteger(1, bytes);
        return String.format("%0" + (bytes.length << 1) + "x", bi);
    }
}