June 2018 Update

Task/Vigen-re-cipher/Scala/vigen-re-cipher.scala

@@ -0,0 +1,34 @@
+object Vigenere {
+  def encrypt(msg: String, key: String) : String = {
+    var result: String = ""
+    var j = 0
+
+    for (i <- 0 to msg.length - 1) {
+      val c = msg.charAt(i)
+      if (c >= 'A' && c <= 'Z') {
+        result += ((c + key.charAt(j) - 2 * 'A') % 26 + 'A').toChar
+        j = (j + 1) % key.length
+      }
+    }
+
+    return result
+  }
+
+  def decrypt(msg: String, key: String) : String = {
+    var result: String = ""
+    var j = 0
+
+    for (i <- 0 to msg.length - 1) {
+      val c = msg.charAt(i)
+      if (c >= 'A' && c <= 'Z') {
+        result += ((c - key.charAt(j) + 26) % 26 + 'A').toChar
+        j = (j + 1) % key.length
+      }
+    }
+
+    return result
+  }
+}
+
+println("Encrypt text ABC => " + Vigenere.encrypt("ABC", "KEY"))
+println("Decrypt text KFA => " + Vigenere.decrypt("KFA", "KEY"))