/[lcore]/trunk/fastmd5.pas
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Contents of /trunk/fastmd5.pas

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Revision 129 - (show annotations)
Fri Dec 6 14:08:10 2013 UTC (4 years ago) by beware
File size: 10041 byte(s)
redefine dvar for convenience
1 { Copyright (C) 2005 Bas Steendijk and Peter Green
2 For conditions of distribution and use, see copyright notice in zlib_license.txt
3 Which is included in the package
4 ----------------------------------------------------------------------------- }
5
6 unit fastmd5;
7
8 {
9 pascal implementation of MD5
10
11 written by Bas Steendijk
12
13 based on RFC1321 - The MD5 Message-Digest Algorithm
14
15 optimized for speed: saved on copying and sub calls in the core routine
16
17 verified on:
18 - Borland Delphi 3
19 - Borland Turbo Pascal 7
20 - Free Pascal 1.0.6 for i386 (on *nix)
21 - various other versions of freepascal on windows and linux i386
22 - various other versions of delphi
23 - free pascal 1.9.5 on powerpc darwin
24
25 this unit is endian portable but is likely to be significantly slower on big endian systems
26 }
27
28 {$Q-,R-}
29
30 interface
31
32
33
34
35
36 type
37 Tmd5=array[0..15] of byte;
38
39 {$i uint32.inc}
40
41 type
42 dvar=array[0..65535] of byte;
43 Tmd5state=record
44 buf:array[0..63] of byte;
45 H:array[0..3] of uint32;
46 msglen:longint;
47 msglenhi:longint;
48 end;
49
50 procedure md5processblock(var h:array of uint32;const data);
51
52 procedure md5init(var state:tmd5state);
53 procedure md5process(var state:tmd5state;const data;len:longint);
54 procedure md5finish(var state:tmd5state;var result);
55
56 procedure getmd5(const data;len:longint;var result);
57
58 function md5tostr(const md5:tmd5):ansistring;
59
60 implementation
61
62 function inttohex(val,bits:integer):ansistring;
63 const
64 hexchar:array[0..15] of ansichar='0123456789abcdef';
65 begin
66 inttohex := hexchar[val shr 4]+hexchar[val and $f];
67 end;
68
69 {$ifdef cpu386}
70 function rol(w,bits:uint32): uint32; assembler;
71 asm
72 {cpu386 is not defined on freepascal. but fpc assembler is incompatible, uses different code}
73 {inline($89/$d1/$d3/$c0);}
74 mov ecx,edx
75 rol eax,cl
76 end;
77 {$else}
78 function rol(w,bits:uint32):uint32;
79 begin
80 rol := (w shl bits) or (w shr (32-bits));
81 end;
82 {$endif}
83
84
85 {function swapbytes(invalue:uint32):uint32;
86 var
87 inbytes : array[0..3] of byte absolute invalue;
88 outbytes : array[0..3] of byte absolute result;
89
90
91 begin
92 outbytes[0] := inbytes[3];
93 outbytes[1] := inbytes[2];
94 outbytes[2] := inbytes[1];
95 outbytes[3] := inbytes[0];
96 end;}
97
98 procedure md5processblock(var h:array of uint32;const data);
99 const
100 S11=7; S12=12; S13=17; S14=22;
101 S21=5; S22=9; S23=14; S24=20;
102 S31=4; S32=11; S33=16; S34=23;
103 S41=6; S42=10; S43=15; S44=21;
104
105 var
106 A,B,C,D:uint32;
107 w:array[0..63] of byte absolute data;
108 x:array[0..15] of uint32 {$ifndef ENDIAN_BIG} absolute data{$endif} ;
109 y:array[0..63] of byte absolute x;
110 {$ifdef ENDIAN_BIG}counter : integer;{$endif}
111 begin
112 A := h[0];
113 B := h[1];
114 C := h[2];
115 D := h[3];
116 {$ifdef ENDIAN_BIG}
117 for counter := 0 to 63 do begin
118 y[counter] := w[counter xor 3];
119 end;
120 {$endif}
121 a := rol(a + ((b and c) or ((not b) and d)) + x[ 0] + $d76aa478, S11) + b;
122 d := rol(d + ((a and b) or ((not a) and c)) + x[ 1] + $e8c7b756, S12) + a;
123 c := rol(c + ((d and a) or ((not d) and b)) + x[ 2] + $242070db, S13) + d;
124 b := rol(b + ((c and d) or ((not c) and a)) + x[ 3] + $c1bdceee, S14) + c;
125 a := rol(a + ((b and c) or ((not b) and d)) + x[ 4] + $f57c0faf, S11) + b;
126 d := rol(d + ((a and b) or ((not a) and c)) + x[ 5] + $4787c62a, S12) + a;
127 c := rol(c + ((d and a) or ((not d) and b)) + x[ 6] + $a8304613, S13) + d;
128 b := rol(b + ((c and d) or ((not c) and a)) + x[ 7] + $fd469501, S14) + c;
129 a := rol(a + ((b and c) or ((not b) and d)) + x[ 8] + $698098d8, S11) + b;
130 d := rol(d + ((a and b) or ((not a) and c)) + x[ 9] + $8b44f7af, S12) + a;
131 c := rol(c + ((d and a) or ((not d) and b)) + x[10] + $ffff5bb1, S13) + d;
132 b := rol(b + ((c and d) or ((not c) and a)) + x[11] + $895cd7be, S14) + c;
133 a := rol(a + ((b and c) or ((not b) and d)) + x[12] + $6b901122, S11) + b;
134 d := rol(d + ((a and b) or ((not a) and c)) + x[13] + $fd987193, S12) + a;
135 c := rol(c + ((d and a) or ((not d) and b)) + x[14] + $a679438e, S13) + d;
136 b := rol(b + ((c and d) or ((not c) and a)) + x[15] + $49b40821, S14) + c;
137
138 a := rol(a + ((b and d) or (c and (not d))) + x[ 1] + $f61e2562, S21) + b;
139 d := rol(d + ((a and c) or (b and (not c))) + x[ 6] + $c040b340, S22) + a;
140 c := rol(c + ((d and b) or (a and (not b))) + x[11] + $265e5a51, S23) + d;
141 b := rol(b + ((c and a) or (d and (not a))) + x[ 0] + $e9b6c7aa, S24) + c;
142 a := rol(a + ((b and d) or (c and (not d))) + x[ 5] + $d62f105d, S21) + b;
143 d := rol(d + ((a and c) or (b and (not c))) + x[10] + $02441453, S22) + a;
144 c := rol(c + ((d and b) or (a and (not b))) + x[15] + $d8a1e681, S23) + d;
145 b := rol(b + ((c and a) or (d and (not a))) + x[ 4] + $e7d3fbc8, S24) + c;
146 a := rol(a + ((b and d) or (c and (not d))) + x[ 9] + $21e1cde6, S21) + b;
147 d := rol(d + ((a and c) or (b and (not c))) + x[14] + $c33707d6, S22) + a;
148 c := rol(c + ((d and b) or (a and (not b))) + x[ 3] + $f4d50d87, S23) + d;
149 b := rol(b + ((c and a) or (d and (not a))) + x[ 8] + $455a14ed, S24) + c;
150 a := rol(a + ((b and d) or (c and (not d))) + x[13] + $a9e3e905, S21) + b;
151 d := rol(d + ((a and c) or (b and (not c))) + x[ 2] + $fcefa3f8, S22) + a;
152 c := rol(c + ((d and b) or (a and (not b))) + x[ 7] + $676f02d9, S23) + d;
153 b := rol(b + ((c and a) or (d and (not a))) + x[12] + $8d2a4c8a, S24) + c;
154
155 a := rol(a + (b xor c xor d) + x[ 5] + $fffa3942, S31) + b;
156 d := rol(d + (a xor b xor c) + x[ 8] + $8771f681, S32) + a;
157 c := rol(c + (d xor a xor b) + x[11] + $6d9d6122, S33) + d;
158 b := rol(b + (c xor d xor a) + x[14] + $fde5380c, S34) + c;
159 a := rol(a + (b xor c xor d) + x[ 1] + $a4beea44, S31) + b;
160 d := rol(d + (a xor b xor c) + x[ 4] + $4bdecfa9, S32) + a;
161 c := rol(c + (d xor a xor b) + x[ 7] + $f6bb4b60, S33) + d;
162 b := rol(b + (c xor d xor a) + x[10] + $bebfbc70, S34) + c;
163 a := rol(a + (b xor c xor d) + x[13] + $289b7ec6, S31) + b;
164 d := rol(d + (a xor b xor c) + x[ 0] + $eaa127fa, S32) + a;
165 c := rol(c + (d xor a xor b) + x[ 3] + $d4ef3085, S33) + d;
166 b := rol(b + (c xor d xor a) + x[ 6] + $04881d05, S34) + c;
167 a := rol(a + (b xor c xor d) + x[ 9] + $d9d4d039, S31) + b;
168 d := rol(d + (a xor b xor c) + x[12] + $e6db99e5, S32) + a;
169 c := rol(c + (d xor a xor b) + x[15] + $1fa27cf8, S33) + d;
170 b := rol(b + (c xor d xor a) + x[ 2] + $c4ac5665, S34) + c;
171
172 a := rol(a + (c xor (b or (not d))) + x[ 0] + $f4292244, S41) + b;
173 d := rol(d + (b xor (a or (not c))) + x[ 7] + $432aff97, S42) + a;
174 c := rol(c + (a xor (d or (not b))) + x[14] + $ab9423a7, S43) + d;
175 b := rol(b + (d xor (c or (not a))) + x[ 5] + $fc93a039, S44) + c;
176 a := rol(a + (c xor (b or (not d))) + x[12] + $655b59c3, S41) + b;
177 d := rol(d + (b xor (a or (not c))) + x[ 3] + $8f0ccc92, S42) + a;
178 c := rol(c + (a xor (d or (not b))) + x[10] + $ffeff47d, S43) + d;
179 b := rol(b + (d xor (c or (not a))) + x[ 1] + $85845dd1, S44) + c;
180 a := rol(a + (c xor (b or (not d))) + x[ 8] + $6fa87e4f, S41) + b;
181 d := rol(d + (b xor (a or (not c))) + x[15] + $fe2ce6e0, S42) + a;
182 c := rol(c + (a xor (d or (not b))) + x[ 6] + $a3014314, S43) + d;
183 b := rol(b + (d xor (c or (not a))) + x[13] + $4e0811a1, S44) + c;
184 a := rol(a + (c xor (b or (not d))) + x[ 4] + $f7537e82, S41) + b;
185 d := rol(d + (b xor (a or (not c))) + x[11] + $bd3af235, S42) + a;
186 c := rol(c + (a xor (d or (not b))) + x[ 2] + $2ad7d2bb, S43) + d;
187 b := rol(b + (d xor (c or (not a))) + x[ 9] + $eb86d391, S44) + c;
188
189 inc(h[0],A);
190 inc(h[1],B);
191 inc(h[2],C);
192 inc(h[3],D);
193 end;
194
195 procedure md5init(var state:tmd5state);
196 begin
197 state.h[0] := $67452301;
198 state.h[1] := $EFCDAB89;
199 state.h[2] := $98BADCFE;
200 state.h[3] := $10325476;
201 state.msglen := 0;
202 state.msglenhi := 0;
203 end;
204
205 procedure md5process(var state:tmd5state;const data;len:longint);
206 var
207 a,b:longint;
208 ofs:longint;
209 p:dvar absolute data;
210 begin
211 b := state.msglen and 63;
212
213 inc(state.msglen,len);
214 while (state.msglen > $20000000) do begin
215 dec(state.msglen,$20000000);
216 inc(state.msglenhi);
217 end;
218 ofs := 0;
219 if b > 0 then begin
220 a := 64-b;
221 if a > len then a := len;
222 move(p[0],state.buf[b],a);
223 inc(ofs,a);
224 dec(len,a);
225 if b+a = 64 then md5processblock(state.h,state.buf);
226 if len = 0 then exit;
227 end;
228 while len >= 64 do begin
229 md5processblock(state.h,p[ofs]);
230 inc(ofs,64);
231 dec(len,64);
232 end;
233 if len > 0 then move(p[ofs],state.buf[0],len);
234 end;
235
236 procedure md5finish(var state:tmd5state;var result);
237 var
238 b :integer;
239 {$ifdef endian_big}
240 h :tmd5 absolute state.h;
241 r :tmd5 absolute result;
242 counter :integer ;
243 {$endif}
244 begin
245 b := state.msglen and 63;
246 state.buf[b] := $80;
247 if b >= 56 then begin
248 {-- for a := b+1 to 63 do state.buf[a] := 0; }
249 fillchar(state.buf[b+1],63-b,0);
250 md5processblock(state.h,state.buf);
251 fillchar(state.buf,56,0);
252 end else begin
253 {-- for a := b+1 to 55 do state.buf[a] := 0; }
254 fillchar(state.buf[b+1],55-b,0);
255 end;
256 state.msglen := state.msglen shl 3;
257
258 state.buf[56] := state.msglen;
259 state.buf[57] := state.msglen shr 8;
260 state.buf[58] := state.msglen shr 16;
261 state.buf[59] := state.msglen shr 24;
262 state.buf[60] := state.msglenhi;
263 state.buf[61] := state.msglenhi shr 8;
264 state.buf[62] := state.msglenhi shr 16;
265 state.buf[63] := state.msglenhi shr 24;
266
267 md5processblock(state.h,state.buf);
268 {$ifdef ENDIAN_BIG}
269 for counter := 0 to 15 do begin
270 r[counter] := h[counter xor 3];
271 end;
272 {$else}
273 move(state.h,result,16);
274 {$endif}
275 fillchar(state,sizeof(state),0);
276 end;
277
278 procedure getmd5(const data;len:longint;var result);
279 var
280 t:tmd5state;
281 begin
282 md5init(t);
283 md5process(t,data,len);
284 md5finish(t,result);
285 end;
286
287 function md5tostr(const md5:tmd5):ansistring;
288 var
289 a:integer;
290 s:ansistring;
291 begin
292 s := '';
293 for a := 0 to 15 do s := s + inttohex(md5[a],2);
294 md5tostr := s;
295 end;
296
297 end.

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