Get MD5 hash of the string (of length 32, with leading zeros) in Kotlin

string-md5.kt

import java.math.BigInteger
import java.security.MessageDigest

fun String.md5(): String {
    val md = MessageDigest.getInstance("MD5")
    return BigInteger(1, md.digest(toByteArray())).toString(16).padStart(32, '0')
}