X-Git-Url: http://nitlanguage.org diff --git a/lib/crypto.nit b/lib/crypto.nit index a4abbd1..011347d 100644 --- a/lib/crypto.nit +++ b/lib/crypto.nit @@ -20,17 +20,17 @@ redef class Char # # NOTE: works on letters only # - # assert 'x'.rot(6) == 'd' - # assert 'T'.rot(15) == 'I' - # assert '1'.rot(10) == '1' - # assert '$'.rot(10) == '$' - # assert 'z'.rot(-2) == 'x' + # assert 'x'.rot(6) == 'd' + # assert 'T'.rot(15) == 'I' + # assert '1'.rot(10) == '1' + # assert '$'.rot(10) == '$' + # assert 'z'.rot(-2) == 'x' fun rot(x: Int): Char do if not is_letter then return self x = x % 26 if x < 0 then x += 26 var up = false - var val = ascii + var val = code_point if is_upper then up = true val += 32 @@ -38,7 +38,7 @@ redef class Char val += x if val > 122 then val -= 26 if up then val -= 32 - return val.ascii + return val.code_point end end @@ -60,8 +60,8 @@ redef class String # We then replace every letter in our original string by # their rotated representations, therefore yielding : "dbedewx" # - # assert "All your base are belong to us".rot(13) == "Nyy lbhe onfr ner orybat gb hf" - # assert "This is no moon.".rot(4).rot(22) == "This is no moon." + # assert "All your base are belong to us".rot(13) == "Nyy lbhe onfr ner orybat gb hf" + # assert "This is no moon.".rot(4).rot(22) == "This is no moon." # # NOTE : Works on letters only # NOTE : This cipher is symmetrically decrypted with an `x` of 26-`x` @@ -81,15 +81,18 @@ redef class String # # Say we have "fuckingbehemoth".railfence(4) # - # This happens in-memory : - # f.....g.....o.. - # .u...n.b...m.t. - # ..c.i...e.e...h - # ...k.....h..... + # This happens in-memory: + # + # ~~~raw + # f.....g.....o.. + # .u...n.b...m.t. + # ..c.i...e.e...h + # ...k.....h..... + # ~~~ # # Therefore, yielding the ciphertext : "fgounbmtcieehkh" # - # assert "fuckingbehemoth".railfence(4) == "fgounbmtcieehkh" + # assert "fuckingbehemoth".railfence(4) == "fgounbmtcieehkh" fun railfence(depth: Int): String do var lines = new Array[FlatBuffer].with_capacity(depth) var up = false @@ -126,7 +129,7 @@ redef class String # Transforms a rail-fence-encrypted String to its original # - # assert "fgounbmtcieehkh".unrail(4) == "fuckingbehemoth" + # assert "fgounbmtcieehkh".unrail(4) == "fuckingbehemoth" fun unrail(depth: Int): String do var dots = "." * length var arr = new FlatBuffer.from(dots)