end
end
-redef class String
+redef class Text
# Performs a Rotation of `x` on each letter of self
#
# Works by replacing every character in `self` by its
#
# NOTE : Works on letters only
# NOTE : This cipher is symmetrically decrypted with an `x` of 26-`x`
- fun rot(x: Int): String do
+ fun rot(x: Int): Text do
var rot = x % 26
if rot < 0 then rot += 26
var d = new FlatBuffer.with_capacity(length)
# Therefore, yielding the ciphertext : "fgounbmtcieehkh"
#
# assert "fuckingbehemoth".railfence(4) == "fgounbmtcieehkh"
- fun railfence(depth: Int): String do
+ fun railfence(depth: Int): Text do
var lines = new Array[FlatBuffer].with_capacity(depth)
var up = false
for i in [0..depth[ do
return r.to_s
end
- # Transforms a rail-fence-encrypted String to its original
+ # Transforms a rail-fence-encrypted Text to its original
#
# assert "fgounbmtcieehkh".unrail(4) == "fuckingbehemoth"
- fun unrail(depth: Int): String do
+ fun unrail(depth: Int): Text do
var dots = "." * length
var arr = new FlatBuffer.from(dots)
var start = 0
end
return arr.to_s
end
+
+ # Returns `self` xored with `key`
+ #
+ # The shortest of the two is cycled through until the longest has been
+ # completely xored.
+ #
+ # assert "goodmorning".xor(" ".to_bytes) == "GOODMORNING"
+ fun xor(key: SequenceRead[Byte]): Text do
+ var xored = new Bytes.with_capacity(bytelen.max(key.length))
+
+ var shortest: SequenceRead[Byte]
+ var longest: SequenceRead[Byte]
+
+ if key.length > self.length then
+ shortest = self.to_bytes
+ longest = key
+ else
+ shortest = key
+ longest = self.to_bytes
+ end
+
+ for i in longest.length.times do
+ xored.add(longest[i] ^ shortest[i % shortest.length])
+ end
+
+ return xored.to_s
+ end
end
redef class Int
#
# In the end, our string is read using the generated array
#
- # SEE: `String::unrail` for how the array is used
+ # SEE: `Text::unrail` for how the array is used
private fun unrail_paces: Array[Couple[Int, Int]] do
var ret = new Array[Couple[Int,Int]].with_capacity(self)
var extremes = new Couple[Int, Int]((self - 1) * 2, (self - 1) * 2)