hex/binary string conversion in Swift

Question

Python has two very useful library method (binascii.a2b_hex(keyStr) and binascii.hexlify(keyBytes)) which I have been struggling with in Swift. Is there anything readily ava

Answer 1

Not really familiar with Python and the checks it performs when convert the numbers, but you can expand the function below:

func convert(_ str: String, fromRadix r1: Int, toRadix r2: Int) -> String? {
    if let num = Int(str, radix: r1) {
        return String(num, radix: r2)
    } else {
        return nil
    }
}

convert("11111111", fromRadix: 2, toRadix: 16)
convert("ff", fromRadix: 16, toRadix: 2)