Printing Java String return array of int

Question

I used the function below to calculate a hash of password. My problem is when I try to print hashcode I get an array of int even that the hash variable is of type String.

private static String getHashCode(String password) {
    String hash = "";
    try {
        MessageDigest md5 = MessageDigest.getInstance("SHA-512");
        byte [] digest = md5.digest(password.getBytes("UTF-8"));
        hash = Arrays.toString(digest);
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    }
    System.out.println(hash);
    return hash;
}

I think you are getting a String in which all entries of your array are printed. Maybe you want a hex ouput of your byte array? — wumpz
– wumpz, Commented Mar 5, 2014 at 14:16

peter.petrov · Accepted Answer · 2014-03-05 14:15:06Z

2

This is normal. You are calling:

hash = Arrays.toString(digest);

So you get a string which represents the array digest in a string form.

answered Mar 5, 2014 at 14:15

peter.petrov

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Tom Leese · Accepted Answer · 2014-03-05 14:28:11Z

1

That is because you called Arrays.toString which returns a direct string representation of the array.

Instead, you probably want a hexadecimal representation of the byte[] array, which you can do with something like this (untested):

StringBuilder hexString = new StringBuilder();
for (int i = 0; i < digest.length; i++) {
    String hex = Integer.toHexString(0xFF & digest[i]);
    if (hex.length() == 1) {
        hexString.append('0');
    }
    hexString.append(hex);
}
String hash = hexString.toString();

edited Mar 5, 2014 at 14:28

answered Mar 5, 2014 at 14:15

Tom Leese

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1 Comment

Hunsu Over a year ago

I didn't know that. So I will do like you said. Thanks

Lucian Novac · Accepted Answer · 2014-03-05 14:16:50Z

1

As you see byte [] digest is a byte array that contain int values after that you transform to string so confert array of int into string so it's normal....

answered Mar 5, 2014 at 14:16

Lucian Novac

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