/*** Source Code of MD5 ***/
y}aKL(AaU / written BY upfeed[FCG] /
-!O v{GHr0 /**************************/
( AI gW ~;)H |R5kV 下面的函数是计算核心，至于分组和填充部分就略去了。
o paRk.p ====================================================
$X\ deJ1Hi 参数说明：
=&8Cg AA,BB,CC,DD是摘要信息，一般初始化为
1iLr K A AA := $67452301;
5EX Ghc' BB := $EFCDAB89;
"A9qC*6[ CC := $98BADCFE;
A WS[e$Mt2 DD := $10325476;
5 Z]]xR[ MSGs是一个长64的LongWord数组，保存的就是要摘要的信息
Crg@05Z ====================================================
yiO/0nMp procedure TMainForm.MD5(var AA, BB, CC, DD: LongWord; MSGs: array of LongWord);
i:/Ws1=q var
*!5X!\e_ A, B, C, D: LongWord;
Fo.p}j+> T: array[1..64] of LongWord;
+"?O2PX i: integer;
K| w\KX0 3'jH,17lWV //没有循环左移的位运算，自己写一个
(8In f_ 59 function ROL(r: LongWord; bit: byte): LongWord;
!+o`,KTYp var
wAA9M4 ii: byte;
o=)[ "V begin
. UaLP for ii:=1 to bit do
XF Cwa if r and $80000000 = $80000000 then
T*1`MIkv r := (r shl 1) or $01
7=`_UqCV else
W*WSjuFr2 r := (r shl 1);
vxZ :l Result := r;
|T+YC[T#v end;
X aw&41K Oh W o //四轮运算中的函数定义，也可以自行定义的
[,TK" procedure FF(var a: LongWord; b, c, d: LongWord; k, s, i: byte);
N _o|2 begin
j 21>\K!p a := b + ROL((a + ((b and c) or (not b and d)) + MSGs[k] + T
), s); f7v|N)
end; VlFhfOR6t
procedure GG(var a: LongWord; b, c, d: LongWord; k, s, i: byte); ;y]BXW&l&
begin )\m%&EXG{
a := b + ROL((a + ((b and d) or (c and not d)) + MSGs[k] + T), s); ,7os3~Mk9
end; |_u|Td (n
procedure HH(var a: LongWord; b, c, d: LongWord; k, s, i: byte); #McX
begin *}RV)0m if
a := b + ROL((a + (b xor c xor d) + MSGs[k] + T), s); ?656P=b)
end; *T-v^ndJh
procedure II(var a: LongWord; b, c, d: LongWord; k, s, i: byte); i:n1Di1~E
begin z|v/h UrD
a := b + ROL((a + (c xor (b or not d)) + MSGs[k] + T), s); "VgPaz#
end; gxCl=\
% ou@Y`
begin %mNd9 ]<
fillchar(T, sizeof(T), 0); bF c %
19*D*dkBR
//常数数组的初始化，通常是这种形式，当然可以自己做手脚的 cL^r^kL("
for i:=1 to 64 do fDrjR6xV
T := Trunc(4294967296*abs(sin(i))); c^8csQ fG
( P\oLr9
A := AA; B := BB; C := CC; D := DD; qs3V2lvYw{
//第一轮 O Y,iz
FF(A, B, C, D, 0, 7, 1); FF(D, A, B, C, 1, 12, 2); FF(C, D, A, B, 2, 17, 3); FF(B, C, D, A, 3, 22, 4); S&{#sl#e
FF(A, B, C, D, 4, 7, 5); FF(D, A, B, C, 5, 12, 6); FF(C, D, A, B, 6, 17, 7); FF(B, C, D, A, 7, 22, 8); *DuP ~8
FF(A, B, C, D, 8, 7, 9); FF(D, A, B, C, 9, 12,10); FF(C, D, A, B, 10,17,11); FF(B, C, D, A, 11,22,12); ' ;KZ.D
FF(A, B, C, D, 12,7,13); FF(D, A, B, C, 13,12,14); FF(C, D, A, B, 14,17,15); FF(B, C, D, A, 15,22,16); gh<2i\})'
VL8yL`~zc.
//第二轮 `Oe"s_O#
GG(A, B, C, D, 1, 5,17); GG(D, A, B, C, 6, 9,18); GG(C, D, A, B, 11,14,19); GG(B, C, D, A, 0, 20,20); >{ .|Ng4K
GG(A, B, C, D, 5, 5,21); GG(D, A, B, C, 10, 9,22); GG(C, D, A, B, 15,14,23); GG(B, C, D, A, 4, 20,24); !b?`TUt
GG(A, B, C, D, 9, 5,25); GG(D, A, B, C, 14, 9,26); GG(C, D, A, B, 3, 14,27); GG(B, C, D, A, 8, 20,28); A9kn\U92
GG(A, B, C, D, 13,5,29); GG(D, A, B, C, 2, 9,30); GG(C, D, A, B, 7, 14,31); GG(B, C, D, A, 12,20,32); v 0D@`C
P*3PDa@
//第三轮 yBnUz"
HH(A, B, C, D, 5, 4,33); HH(D, A, B, C, 8, 11,34); HH(C, D, A, B, 11,16,35); HH(B, C, D, A, 14,23,36); iE* Y@E5x0
HH(A, B, C, D, 1, 4,37); HH(D, A, B, C, 4, 11,38); HH(C, D, A, B, 7, 16,39); HH(B, C, D, A, 10,23,40); A*TO0L
HH(A, B, C, D, 13,4,41); HH(D, A, B, C, 0, 11,42); HH(C, D, A, B, 3, 16,43); HH(B, C, D, A, 6, 23,44); @0fiui_
HH(A, B, C, D, 9, 4,45); HH(D, A, B, C, 12,11,46); HH(C, D, A, B, 15,16,47); HH(B, C, D, A, 2, 23,48); Vy@ 0Got5=
3\H0Nkubts
//第四轮 Y%#r&de
II(A, B, C, D, 0, 6,49); II(D, A, B, C, 7, 10,50); II(C, D, A, B, 14,15,51); II(B, C, D, A, 5, 21,52); >/9on.
II(A, B, C, D, 12,6,53); II(D, A, B, C, 3, 10,54); II(C, D, A, B, 10,15,55); II(B, C, D, A, 1, 21,56); \><v1x>;
II(A, B, C, D, 8, 6,57); II(D, A, B, C, 15,10,58); II(C, D, A, B, 6, 15,59); II(B, C, D, A, 13,21,60); I@l }%L
II(A, B, C, D, 4, 6,61); II(D, A, B, C, 11,10,62); II(C, D, A, B, 2, 15,63); II(B, C, D, A, 9, 21,64); (i>bGmiN
1MxO ((k
AA := A + AA; 'I5~<"E
BB := B + BB; 3;f}w g
CC := C + CC; : i/uRR
DD := D + DD; 6 u}c543
end;