Convert a ByteArray to Hex encoded String

ByteArrayToHex.kt

private val HEX_CHARS = "0123456789ABCDEF".toCharArray()

/**
 * Extension function that converts a ByteArray to a hex encoded CharArray.
 */
fun ByteArray.toHex(): CharArray {
    val result = StringBuilder()
    forEach {
        val octet = it.toInt()
        val firstIndex = (octet and 0xF0).ushr(4)
        val secondIndex = octet and 0x0F
        result.append(HEX_CHARS[firstIndex])
        result.append(HEX_CHARS[secondIndex])
    }
    return result.toString().toCharArray()
}