using messagedigest from Kotlin

DigestTest.kt

import java.security.MessageDigest
import kotlin.test.Test
import kotlin.test.assertTrue

class Scratchpad {
    @Test
    fun scratchpad() {
        val digest = MessageDigest.getInstance("SHA-256")
        digest.update("foo".toByteArray())
        digest.update("bar".toByteArray())
        val result1 = digest.digest()

        val digest2 = MessageDigest.getInstance("SHA-256")
        digest2.update("foobar".toByteArray())
        val result2 = digest2.digest()

        assertTrue(result1 contentEquals result2)
    }
}