Convert Bytes to a lowercase hex string.

import Bytes.Encode as Encode


Encode.encode (Encode.unsignedInt8 255)
    |> fromBytes
--> "ff"

Parse a hex string into Bytes. Returns Nothing if the string has odd length or contains non-hex characters. Accepts both uppercase and lowercase hex digits.

toBytes "ff"
--> Just <1 byte>


toBytes "zz"
--> Nothing

Parse a lowercase hex string into Bytes. Does not validate the input: assumes even length and only lowercase hex characters (0-9, a-f). About 20% faster than toBytes.

toBytesUnchecked "ff"
--> <1 byte>