Add bin and edit workflow

bin/gems/ruby-rc4-0.1.5/lib/rc4.rb

@@ -0,0 +1,43 @@
+class RC4
+
+  def initialize(str)
+    begin
+      raise SyntaxError, "RC4: Key supplied is blank"  if str.eql?('')
+
+      @q1, @q2 = 0, 0
+      @key = []
+      str.each_byte {|elem| @key << elem} while @key.size < 256
+      @key.slice!(256..@key.size-1) if @key.size >= 256
+      @s = (0..255).to_a
+      j = 0 
+      0.upto(255) do |i| 
+        j = (j + @s[i] + @key[i] )%256
+        @s[i], @s[j] = @s[j], @s[i]
+      end    
+    end
+  end
+  
+  def encrypt!(text)
+    process text
+  end  
+  
+  def encrypt(text)
+    process text.dup
+  end 
+
+  alias_method :decrypt, :encrypt
+  
+  private
+
+  def process(text)
+    text.unpack("C*").map { |c| c ^ round }.pack("C*")
+  end
+  
+  def round
+    @q1 = (@q1 + 1)%256
+    @q2 = (@q2 + @s[@q1])%256
+    @s[@q1], @s[@q2] = @s[@q2], @s[@q1]
+    @s[(@s[@q1]+@s[@q2])%256]  
+  end
+
+end