remove rc4, waiting for a better implementation someday.

extra/crypto/rc4/authors.txt

@@ -1 +0,0 @@
-Doug Coleman

extra/crypto/rc4/rc4.factor

@@ -1,39 +0,0 @@
-USING: kernel math sequences namespaces ;
-IN: crypto.rc4
-
-! http://en.wikipedia.org/wiki/RC4_%28cipher%29
-
-<PRIVATE
-
-SYMBOL: i
-SYMBOL: j
-SYMBOL: s
-SYMBOL: key
-SYMBOL: l
-
-! key scheduling algorithm, initialize s
-: ksa ( -- )
-    256 [ ] map s set
-    0 j set
-    256 [
-        dup s get nth j get + over l get mod key get nth + 255 bitand j set
-        dup j get s get exchange drop
-    ] each ;
-
-: generate ( -- n )
-    i get 1+ 255 bitand i set
-    j get i get s get nth + 255 bitand j set
-    i get j get s get exchange
-    i get s get nth j get s get nth + 255 bitand s get nth ;
-
-PRIVATE>
-
-: rc4 ( key -- )
-    [
-        [ key set ] keep
-        length l set
-        ksa
-        0 i set
-        0 j set
-    ] with-scope ;
-