remove javax.xml.bind.DatatypeConverter from dependencies

- add hex utilities
- tests

build.sbt

@@ -1,6 +1,6 @@
 organization := "fr.edgewhere"
 name := "feistel-jar"
-version := "1.3.5"
+version := "1.4.0"
 scalaVersion := "2.12.13"
 
 assemblyMergeStrategy in assembly := {

src/main/scala/fr/edgewhere/feistel/Main.scala

@@ -10,8 +10,8 @@ import fr.edgewhere.feistel.common.utils.hash.Engine._
  * @since   1.0
  * @version 1.0
  * @example {{{
- *  $ sbt assembly && java -cp target/scala-2.12/feistel-jar-0.1.0.jar fr.edgewhere.feistel.Main 'myWordToObfuscate'
- *  $ java -cp target/scala-2.12/feistel-jar-0.1.0.jar fr.edgewhere.feistel.Main -d '!f^w=€¦-Hyrbq¡#bs'
+ *  $ sbt assembly && java -cp target/scala-2.12/feistel-jar-1.4.0.jar fr.edgewhere.feistel.Main 'myWordToObfuscate'
+ *  $ java -cp target/scala-2.12/feistel-jar-1.4.0.jar fr.edgewhere.feistel.Main -d '!f^w=€¦-Hyrbq¡#bs'
  * }}}
  */
 object Main extends App {

src/main/scala/fr/edgewhere/feistel/common/utils/base256/Readable.scala

@@ -1,12 +1,12 @@
 package fr.edgewhere.feistel.common.utils.base256
 
-import javax.xml.bind.DatatypeConverter
+import fr.edgewhere.feistel.common.utils.hex.Hex
 
 /**
  * Readable class
  *
  * @author  Cyril Dever
- * @since   1.0
+ * @since   2.0
  * @version 1.0
  */
 object Readable {
@@ -30,11 +30,11 @@ object Readable {
      */
     def string: String = r.bytes.map(_.toChar).mkString // TODO toString couldn't be overridden either
 
-    def toHex: String = DatatypeConverter.printHexBinary(bytes).toLowerCase
+    def toHex: String = Hex.byteArrayToHexString(bytes)
   }
 
   def fromHex(str: String): Readable =
-    Readable(DatatypeConverter.parseHexBinary(str).map(b => charAt(b.toInt)).mkString)
+    Hex.stringToSomeByteArray(str).getOrElse(Seq.empty).map(b => charAt(b.toInt)).mkString
 
   val CHARSET = "!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^`abcdefghijklmnopqrstuvwxyz{|}€¡¢£¤¥¦§¨©ª«¬®¯°±²³´µ¶·¸¹»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷ùúûüýÿăąĊčđĕĘğħĩĭıĵķĿŀŁłňŋŏœŖřŝşŦŧũūůŲŵſƀƁƂƄƆƇƔƕƗƙƛƜƟƢƥƦƧƩƪƭƮưƱƲƵƸƺƾǀǁǂƿǬǮǵǶǹǻǿ"
 

src/main/scala/fr/edgewhere/feistel/common/utils/hash/Hash.scala

@@ -1,20 +1,20 @@
 package fr.edgewhere.feistel.common.utils.hash
 
-import javax.xml.bind.DatatypeConverter
+import fr.edgewhere.feistel.common.utils.hex.Hex
 
 /**
  * Hash type
  *
  * @author  Cyril Dever
- * @since   1.0
+ * @since   2.0
  * @version 1.0
  */
 object Hash {
   type Hash = Seq[Byte]
 
   implicit class HashOps(h: Hash) {
-    def toHex: String = DatatypeConverter.printHexBinary(h.toArray).toLowerCase
+    def toHex: String = h.map(b => f"$b%02x").mkString.toLowerCase
   }
 
-  def fromHex(str: String): Hash = DatatypeConverter.parseHexBinary(str)
+  def fromHex(str: String): Hash = Hex.stringToSomeByteArray(str).getOrElse(Seq.empty)
 }

src/main/scala/fr/edgewhere/feistel/common/utils/hex/Hex.scala

@@ -0,0 +1,20 @@
+package fr.edgewhere.feistel.common.utils.hex
+
+import java.math.BigInteger
+
+/**
+ * Hex utility
+ *
+ * @author  Cyril Dever
+ * @since   1.0
+ * @version 1.4
+ */
+object Hex {
+  def byteArrayToHexString(bytes: Seq[Byte]): String = bytes.map(b => f"$b%02x").mkString.toLowerCase
+
+  def stringToSomeByteArray(str: String): Option[Seq[Byte]] = try {
+    Some(new BigInteger(str, 16).toByteArray)
+  } catch {
+    case _: Exception => None
+  }
+}

src/test/scala/fr/edgewhere/feistel/common/utils/base256/ReadableSpecs.scala

@@ -1,13 +1,13 @@
 package fr.edgewhere.feistel.common.utils.base256
 
 import fr.edgewhere.BasicUnitSpecs
-import javax.xml.bind.DatatypeConverter
+import fr.edgewhere.feistel.common.utils.hex.Hex
 
 /**
  * ReadableSpecs test class
  *
  * @author  Cyril Dever
- * @since   1.0
+ * @since   2.0
  * @version 1.0
  */
 class ReadableSpecs extends BasicUnitSpecs {
@@ -27,7 +27,7 @@ class ReadableSpecs extends BasicUnitSpecs {
     val fpeEdgewhere = Readable("K¡(#q|r5*")
     fpeEdgewhere.length should equal (9)
     val fpeBytes = Seq[Byte](42, 93, 7, 2, 79, 90, 80, 20, 9)
-    fpeBytes should equal (DatatypeConverter.parseHexBinary("2a5d07024f5a501409"))
+    fpeBytes should equal (Hex.stringToSomeByteArray("2a5d07024f5a501409").get)
     val fpeB256 = Readable(fpeBytes)
     fpeB256 should equal (fpeEdgewhere)
     fpeB256.length should equal (fpeEdgewhere.length)

src/test/scala/fr/edgewhere/feistel/common/utils/hex/HexSpecs.scala

@@ -0,0 +1,21 @@
+package fr.edgewhere.feistel.common.utils.hex
+
+import fr.edgewhere.BasicUnitSpecs
+
+/**
+ * HexSpecs test class
+ *
+ * @author  Cyril Dever
+ * @since   1.0
+ * @version 1.4
+ */
+class HexSpecs extends BasicUnitSpecs {
+
+  "Hex.stringToSomeByteArray" should "return the appropriate byte array" in {
+    val hexString = "123abc"
+
+    val found = Hex.stringToSomeByteArray(hexString)
+    found.isEmpty shouldBe false
+    found.get should equal (Seq(18, 58, -68))
+  }
+}