SHA-512 hashing with Android

Question

I was wondering if I can SHA-512 hash a string on Android Studio without a salt.

I've seen other questions, but they all involve the salt, but I want something like this:

TestBox.text = sha512("Hello, world!");

And TextBox will read c1527cd893c124773d811911970c8fe6e857d6df5dc9226bd8a160614c0cd963a4ddea2b94bb7d36021ef9d865d5cea294a82dd49a0bb269f51f6e7a57f79421;

Solution 1

The other questions you saw use salt so just don't use salt like so:

MessageDigest md = MessageDigest.getInstance("SHA-512");
byte[] digest = md.digest("Hello, world!".getBytes());
StringBuilder sb = new StringBuilder();
for (int i = 0; i < digest.length; i++) {
    sb.append(Integer.toString((digest[i] & 0xff) + 0x100, 16).substring(1));
}
System.out.println(sb);

Based on this answer.

Solution 2

Keds example is right, but .length will always be biger than 32, (127) so more correct answer should be

private fun getSHA512(input:String):String{
    val md: MessageDigest = MessageDigest.getInstance("SHA-512")
    val messageDigest = md.digest(input.toByteArray())

    // Convert byte array into signum representation
    val no = BigInteger(1, messageDigest)

    // Convert message digest into hex value
    var hashtext: String = no.toString(16)

    // Add preceding 0s to make it 128 chars long
    while (hashtext.length < 128) {
        hashtext = "0$hashtext"
    }



    // return the HashText
    return hashtext
}

Solution 3

method for calculating sha-512 in kotlin

    fun getSHA512(input:String):String{
        val md: MessageDigest = MessageDigest.getInstance("SHA-512")
        val messageDigest = md.digest(input.toByteArray())

        // Convert byte array into signum representation
        val no = BigInteger(1, messageDigest)

        // Convert message digest into hex value
        var hashtext: String = no.toString(16)

        // Add preceding 0s to make it 32 bit
        while (hashtext.length < 32) {
            hashtext = "0$hashtext"
        }

        // return the HashText
        return hashtext
    }