1 ! Copyright (C) 2006, 2008 Doug Coleman.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: kernel io io.binary io.files io.streams.byte-array math
4 math.functions math.parser namespaces splitting grouping strings
5 sequences byte-arrays locals sequences.private macros fry
6 io.encodings.binary math.bitwise checksums accessors
7 checksums.common checksums.stream combinators combinators.smart ;
12 INSTANCE: md5 stream-checksum
14 TUPLE: md5-state < checksum-state state old-state ;
16 : <md5-state> ( -- md5 )
17 64 md5-state new-checksum-state
18 { HEX: 67452301 HEX: efcdab89 HEX: 98badcfe HEX: 10325476 }
19 [ clone >>state ] [ >>old-state ] bi ;
23 : v-w+ ( v1 v2 -- v3 ) [ w+ ] 2map ;
25 : update-md5 ( md5 -- )
26 [ state>> ] [ old-state>> v-w+ dup clone ] [ ] tri
27 [ (>>old-state) ] [ (>>state) ] bi ; inline
30 sin abs 32 2^ * >integer ; inline
32 :: F ( X Y Z -- FXYZ )
33 #! F(X,Y,Z) = XY v not(X) Z
34 X Y bitand X bitnot Z bitand bitor ; inline
36 :: G ( X Y Z -- GXYZ )
37 #! G(X,Y,Z) = XZ v Y not(Z)
38 X Z bitand Y Z bitnot bitand bitor ; inline
41 #! H(X,Y,Z) = X xor Y xor Z
42 bitxor bitxor ; inline
44 :: I ( X Y Z -- IXYZ )
45 #! I(X,Y,Z) = Y xor (X v not(Z))
46 Z bitnot X bitor Y bitxor ; inline
70 :: (ABCD) ( x V a b c d k s i quot -- )
71 #! a = b + ((a + F(b,c,d) + X[k] + T[i]) <<< s)
82 MACRO: with-md5-round ( ops quot -- )
83 '[ [ _ (ABCD) ] compose ] map '[ _ 2cleave ] ;
85 : (process-md5-block-F) ( block v -- )
100 [ d a b c 13 S12 14 ]
101 [ c d a b 14 S13 15 ]
102 [ b c d a 15 S14 16 ]
103 } [ F ] with-md5-round ; inline
105 : (process-md5-block-G) ( block v -- )
109 [ c d a b 11 S23 19 ]
112 [ d a b c 10 S22 22 ]
113 [ c d a b 15 S23 23 ]
116 [ d a b c 14 S22 26 ]
119 [ a b c d 13 S21 29 ]
122 [ b c d a 12 S24 32 ]
123 } [ G ] with-md5-round ; inline
125 : (process-md5-block-H) ( block v -- )
129 [ c d a b 11 S33 35 ]
130 [ b c d a 14 S34 36 ]
134 [ b c d a 10 S34 40 ]
135 [ a b c d 13 S31 41 ]
140 [ d a b c 12 S32 46 ]
141 [ c d a b 15 S33 47 ]
143 } [ H ] with-md5-round ; inline
145 : (process-md5-block-I) ( block v -- )
149 [ c d a b 14 S43 51 ]
151 [ a b c d 12 S41 53 ]
153 [ c d a b 10 S43 55 ]
156 [ d a b c 15 S42 58 ]
158 [ b c d a 13 S44 60 ]
160 [ d a b c 11 S42 62 ]
163 } [ I ] with-md5-round ; inline
165 M: md5-state checksum-block ( block state -- )
167 [ 4 <groups> [ le> ] map ] [ state>> ] bi* {
168 [ (process-md5-block-F) ]
169 [ (process-md5-block-G) ]
170 [ (process-md5-block-H) ]
171 [ (process-md5-block-I) ]
177 : md5>checksum ( md5 -- bytes )
178 state>> [ 4 >le ] map B{ } concat-as ;
180 M: md5-state clone ( md5 -- new-md5 )
182 [ clone ] change-state
183 [ clone ] change-old-state ;
185 M: md5-state get-checksum ( md5 -- bytes )
186 clone [ bytes>> f ] [ bytes-read>> pad-last-block ] [ ] tri
187 [ [ checksum-block ] curry each ] [ md5>checksum ] bi ;
189 M: md5 checksum-stream ( stream checksum -- byte-array )
191 [ <md5-state> ] dip add-checksum-stream get-checksum ;