1 USING: arrays kernel io io.binary sbufs splitting strings sequences
2 namespaces math math.parser parser hints ;
5 : >32-bit ( x -- y ) HEX: ffffffff bitand ; inline
6 : >64-bit ( x -- y ) HEX: ffffffffffffffff bitand ; inline
8 : w+ ( int int -- int ) + >32-bit ; inline
10 : (nth-int) ( string n -- int )
11 2 shift dup 4 + rot <slice> ; inline
13 : nth-int ( string n -- int ) (nth-int) le> ; inline
15 : nth-int-be ( string n -- int ) (nth-int) be> ; inline
17 : update ( num var -- ) [ w+ ] change ; inline
19 : calculate-pad-length ( length -- pad-length )
20 dup 56 < 55 119 ? swap - ;
22 : preprocess-plaintext ( string big-endian? -- padded-string )
23 #! pad 0x80 then 00 til 8 bytes left, then 64bit length in bits
26 dup length HEX: 3f bitand
27 calculate-pad-length 0 <string> %
28 length 3 shift 8 rot [ >be ] [ >le ] if %
29 ] "" make over push-all ;
34 : pad-last-block ( str big-endian? length -- str )
38 dup HEX: 3f bitand calculate-pad-length 0 <string> %
39 3 shift 8 rot [ >be ] [ >le ] if %
42 : shift-mod ( n s w -- n )
43 >r shift r> 1 swap shift 1 - bitand ; inline
45 : update-old-new ( old new -- )
46 [ get >r get r> ] 2keep >r >r w+ dup r> set r> set ; inline
48 : bitroll ( x s w -- y )
50 over 0 < [ [ + ] keep ] when
52 [ - ] keep shift-mod bitor ; inline
54 : bitroll-32 ( n s -- n' ) 32 bitroll ;
56 HINTS: bitroll-32 bignum fixnum ;
58 : bitroll-64 ( n s -- n' ) 64 bitroll ;
60 HINTS: bitroll-64 bignum fixnum ;
62 : hex-string ( seq -- str )
63 [ [ >hex 2 48 pad-left % ] each ] "" make ;
65 : slice3 ( n seq -- a b c ) >r dup 3 + r> <slice> first3 ;
67 : seq>2seq ( seq -- seq1 seq2 )
68 #! { abcdefgh } -> { aceg } { bdfh }
69 2 group flip dup empty? [ drop { } { } ] [ first2 ] if ;
71 : 2seq>seq ( seq1 seq2 -- seq )
72 #! { aceg } { bdfh } -> { abcdefgh }
74 [ 2array flip concat ] keep like ;
76 : mod-nth ( n seq -- elt )
78 [ length mod ] keep nth ;