# File lib/pdf/writer/arc4.rb, line 17
17:   def initialize(key)
18:     @key = key
19:   end

    # File lib/pdf/writer/arc4.rb, line 48
48:   def encrypt(text)
49:     len = text.size
50:     a = b = 0
51:     c = @arc4.dup
52:     out = ""
53: 
54:     text.each_byte do |x|
55:       a = (a + 1) % 256
56:       b = (b + c[a].to_i) % 256
57:       c[a], c[b] = c[b], c[a]
58:       k = (c[(c[a].to_i + c[b].to_i) % 256]).to_i
59:       out << ("%c" % (x.to_i ^ k))
60:     end
61:     out
62:   end

    # File lib/pdf/writer/arc4.rb, line 28
28:   def init(key)
29:     @arc4 = ""
30: 
31:       # Setup the control array
32:     return if key.empty?
33: 
34:     a = []
35:     (0..255).each { |ii| a[ii] = "%c" % ii }
36: 
37:     k = (key * 256)[0..255].split(//)
38: 
39:     jj = 0
40:     @arc4.each_with_index do |el, ii|
41:       jj = ((jj + el.to_i) + k[ii].to_i) % 256
42:       a[ii], a[jj] = a[jj], a[ii]
43:     end
44:     @arc4 = a.join
45:   end

    # File lib/pdf/writer/arc4.rb, line 22
22:   def prepare(object)
23:     hex = ("%06x" % [object.oid]).scan(/../).reverse
24:     init(Digest::MD5.digest("#{@key}#{hex.pack('H10')}")[0...10])
25:   end