Vigenère cipher: Difference between revisions

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@@ Line 2,205: / Line 2,205: @@
 =={{header|Ruby}}==
-<lang Ruby>class VigenereCipher
+<lang Ruby>module VigenereCipher
   BASE = 'A'.ord
   SIZE = 'Z'.ord - BASE + 1
-  def key=(key)
+  def encrypt(text, key)
-    @key = key.upcase.gsub(/[^A-Z]/, '')
+    crypt(text, key, :+)
   end
-  def initialize(key)
+  def decrypt(text, key)
-    self.key= key
+    crypt(text, key, :-)
   end
-  def encrypt(text)
+  def crypt(text, key, dir)
-    crypt(text, :+)
+    text = text.upcase.gsub(/[^A-Z]/, '')
+    key_iterator = key.upcase.gsub(/[^A-Z]/, '').chars.map{|c| c.ord - BASE}.cycle
-  end
+    text.each_char.inject('') do |ciphertext, char|
+      offset = key_iterator.next
-  def decrypt(text)
+      ciphertext << ((char.ord - BASE).send(dir, offset) % SIZE + BASE).chr
-    crypt(text, :-)
-  end
-  def crypt(text, dir)
-    plaintext = text.upcase.gsub(/[^A-Z]/, '')
-    key_iterator = @key.chars.cycle
-    ciphertext = ''
-    plaintext.each_char do |plain_char|
-      offset = key_iterator.next.ord - BASE
-      ciphertext +=
-        ((plain_char.ord - BASE).send(dir, offset) % SIZE + BASE).chr
     end
-    return ciphertext
   end
@@ Line 2,242: / Line 2,231: @@
 Demonstration:
-<lang Ruby>vc = VigenereCipher.new('Vigenere cipher')
+<lang Ruby>include VigenereCipher
 plaintext = 'Beware the Jabberwock, my son! The jaws that bite, the claws that catch!'
+key = 'Vigenere cipher'
-ciphertext = vc.encrypt(plaintext)
+ciphertext = VigenereCipher.encrypt(plaintext, key)
-recovered  = vc.decrypt(ciphertext)
+recovered  = VigenereCipher.decrypt(ciphertext, key)
 puts "Original: #{plaintext}"
 puts "Encrypted: #{ciphertext}"
 puts "Decrypted: #{recovered}"</lang>
+{{out}}
-Output:
+<pre>
-<pre>Original: Beware the Jabberwock, my son! The jaws that bite, the claws that catch!
+Original: Beware the Jabberwock, my son! The jaws that bite, the claws that catch!
 Encrypted: WMCEEIKLGRPIFVMEUGXQPWQVIOIAVEYXUEKFKBTALVXTGAFXYEVKPAGY
-Decrypted: BEWARETHEJABBERWOCKMYSONTHEJAWSTHATBITETHECLAWSTHATCATCH</pre>
+Decrypted: BEWARETHEJABBERWOCKMYSONTHEJAWSTHATBITETHECLAWSTHATCATCH
+</pre>
 =={{header|Rust}}==