Certificate public key to sha256 pin converter

SslUtils.kt

object SslUtils {
    fun getBase64UrlEncodedSha256(publicKey: String): String {
        return Base64.getUrlEncoder().encodeToString(publicKey.decodeHex())
    }

    private fun String.decodeHex(): ByteArray {
        check(length % 2 == 0) { "Must have an even length" }

        return chunked(2)
            .map { it.toInt(16).toByte() }
            .toByteArray()
    }
}