Scala hex string to bytes

Question

Is there a neat way in Scala to convert a hexadecimally encoded String to a protobuf ByteString (and back again)?

Answer 1

You can use (without additional dependencies) DatatypeConverter as:

import com.google.protobuf.ByteString
import javax.xml.bind.DatatypeConverter
val hexString: String = "87C2D268483583714CD5"

val byteString: ByteString = ByteString.copyFrom(
  DatatypeConverter.parseHexBinary(hexString)
)

val originalString = DatatypeConverter.printHexBinary(byteString.toByteArray)