Android In App Billing: securing application public key

Question

From Android In App Billing version 3 (TrivialDrive)sample application coming with sdk

MainActivity.java

/* base64EncodedPublicKey should be YOUR A         


        

Answer 1

Building on Steven Craft's Answer with help i got from gidds

Here's a cleaner code. In addition it swaps out digit (0-9) for ascii character (37-46) and vice versa. Written in Kotlin.

 val string = "Hello World 012345679 %&()"
 fun String.swapCase() = map {
        when {
            it.isUpperCase() -> it.toLowerCase()
            it.isLowerCase() -> it.toUpperCase()
            it.isDigit() -> (37 + (it.toInt() - 48)).toChar()
            it.isDefined() -> if (it.toInt() >= 37 && it.toInt() <= 46) (48 + (it.toInt() - 37)).toChar() else it
            else -> it
        }
    }.joinToString("")
    println(string.swapCase()) // hELLO wORLD %&'()*+,. 0134

Use this -> https://edge-developer.github.io/BillingGenerator/ to generate all those in a fly