Data commit

Task/Vigen-re-cipher/Nim/vigen-re-cipher.nim

@@ -0,0 +1,24 @@
+import strutils
+
+proc encrypt(msg, key: string): string =
+  var pos = 0
+  for c in msg:
+    if c in Letters:
+      result.add chr(((ord(key[pos]) + ord(c.toUpperAscii)) mod 26) + ord('A'))
+      pos = (pos + 1) mod key.len
+
+proc decrypt(msg, key: string): string =
+  var pos = 0
+  for c in msg:
+    result.add chr(((26 + ord(c) - ord(key[pos])) mod 26) + ord('A'))
+    pos = (pos + 1) mod key.len
+
+const text = "Beware the Jabberwock, my son! The jaws that bite, the claws that catch!"
+const key = "VIGENERECIPHER"
+
+let encr = encrypt(text, key)
+let decr = decrypt(encr, key)
+
+echo text
+echo encr
+echo decr