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Anasayfa Programlama Delphi MD5 Şifreleme


MD5 Şifreleme

AÇIKLAMA 

Delphi ile yazılmış basit bir MD5 şifreleme örneği teşkil eden program.

Program Kodu: 

 
 
unit MD5;
 
 
 
interface
 
 
 
type
 
Dizi= Array of integer;
 
 
 
function MD_5(str: string): string;
 
 
 
implementation
 
 
 
function rhex(num: integer): string;
 
var
 
str,hex_chr: string;
 
j: integer;
 
begin
 
hex_chr:='0123456789abcdef';
 
str:='';
 
for j:=0 to 0 do
 
str:=str+hex_chr[((num shr (j*8+4)) and $F)+1]+hex_chr[((num shr (j*8)) and $F)+1];
 
Result:=str;
 
end;
 
 
 
function str2blks_MD5(str: string): Dizi;
 
var
 
nblk: integer;
 
blks: Dizi;
 
i: integer;
 
begin
 
nblk:=((length(str)+8) shr 6)+1;
 
SetLength(blks,nblk*16);
 
for i:=0 to nblk*16-1 do blks[i]:=0;
 
for i:=0 to length(str)-1 do
 
blks[i shr 2]:=blks[i shr 2] or ((ord(str[i+1]) shl ((i mod 4)*8)));
 
blks[i shr 2]:=blks[i shr 2] or ($80 shl ((i mod 4)*8));
 
blks[nblk*16-2]:=length(str)*8;
 
Result:=blks;
 
end;
 
 
 
function add(x,y: integer): integer;
 
var
 
lsw,msw: integer;
 
begin
 
lsw:=(x and $FFFF)+(y and $FFFF);
 
msw:=(x shr 16)+(y shr 16)+(lsw shr 16);
 
Result:=(msw shl 16) or (lsw and $FFFF);
 
end;
 
 
 
function rol(num,cnt: integer): integer;
 
begin
 
Result:=(num shl cnt) or (num shr (32 - cnt));
 
end;
 
 
 
function cmn(q, a, b, x, s, t: integer): integer;
 
begin
 
Result:= add(rol(add(add(a, q), add(x, t)), s), b);
 
end;
 
 
 
function ff(a, b, c, d, x, s, t: integer): integer;
 
Begin
 
Result:= cmn((b and c) or ((not b) and d), a, b, x, s, t);
 
end;
 
 
 
function gg(a, b, c, d, x, s, t: integer): integer;
 
Begin
 
Result:= cmn((b and d) or (c and (not d)), a, b, x, s, t);
 
end;
 
 
 
function hh(a, b, c, d, x, s, t: integer): integer;
 
Begin
 
Result:= cmn(b xor c xor d, a, b, x, s, t);
 
end;
 
 
 
function ii(a, b, c, d, x, s, t: integer): integer;
 
Begin
 
Result:= cmn(c xor (b or (not d)), a, b, x, s, t);
 
end;
 
 
 
function MD_5(str: string): string;
 
var
 
x: dizi;
 
a,b,c,d,olda,oldb,oldc,oldd: integer;
 
i: integer;
 
begin
 
x:= str2blks_MD5(str);
 
a:= 1732584193;
 
b:= -271733879;
 
c:= -1732584194;
 
d:= 271733878;
 
 
 
i:=0;
 
while i<length(x) do
 
 
 
begin
 
olda := a;
 
oldb := b;
 
oldc := c;
 
oldd := d;
 
 
 
a := ff(a, b, c, d, x[i+ 0], 7 , -680876936);
 
d := ff(d, a, b, c, x[i+ 1], 12, -389564586);
 
c := ff(c, d, a, b, x[i+ 2], 17, 606105819);
 
b := ff(b, c, d, a, x[i+ 3], 22, -1044525330);
 
a := ff(a, b, c, d, x[i+ 4], 7 , -176418897);
 
d := ff(d, a, b, c, x[i+ 5], 12, 1200080426);
 
c := ff(c, d, a, b, x[i+ 6], 17, -1473231341);
 
b := ff(b, c, d, a, x[i+ 7], 22, -45705983);
 
a := ff(a, b, c, d, x[i+ 8], 7 , 1770035416);
 
d := ff(d, a, b, c, x[i+ 9], 12, -1958414417);
 
c := ff(c, d, a, b, x[i+10], 17, -42063);
 
b := ff(b, c, d, a, x[i+11], 22, -1990404162);
 
a := ff(a, b, c, d, x[i+12], 7 , 1804603682);
 
d := ff(d, a, b, c, x[i+13], 12, -40341101);
 
c := ff(c, d, a, b, x[i+14], 17, -1502002290);
 
b := ff(b, c, d, a, x[i+15], 22, 1236535329);
 
 
 
a := gg(a, b, c, d, x[i+ 1], 5 , -165796510);
 
d := gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
 
c := gg(c, d, a, b, x[i+11], 14, 643717713);
 
b := gg(b, c, d, a, x[i+ 0], 20, -373897302);
 
a := gg(a, b, c, d, x[i+ 5], 5 , -701558691);
 
d := gg(d, a, b, c, x[i+10], 9 , 38016083);
 
c := gg(c, d, a, b, x[i+15], 14, -660478335);
 
b := gg(b, c, d, a, x[i+ 4], 20, -405537848);
 
a := gg(a, b, c, d, x[i+ 9], 5 , 568446438);
 
d := gg(d, a, b, c, x[i+14], 9 , -1019803690);
 
c := gg(c, d, a, b, x[i+ 3], 14, -187363961);
 
b := gg(b, c, d, a, x[i+ 8], 20, 1163531501);
 
a := gg(a, b, c, d, x[i+13], 5 , -1444681467);
 
d := gg(d, a, b, c, x[i+ 2], 9 , -51403784);
 
c := gg(c, d, a, b, x[i+ 7], 14, 1735328473);
 
b := gg(b, c, d, a, x[i+12], 20, -1926607734);
 
 
 
a := hh(a, b, c, d, x[i+ 5], 4 , -378558);
 
d := hh(d, a, b, c, x[i+ 8], 11, -2022574463);
 
c := hh(c, d, a, b, x[i+11], 16, 1839030562);
 
b := hh(b, c, d, a, x[i+14], 23, -35309556);
 
a := hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
 
d := hh(d, a, b, c, x[i+ 4], 11, 1272893353);
 
c := hh(c, d, a, b, x[i+ 7], 16, -155497632);
 
b := hh(b, c, d, a, x[i+10], 23, -1094730640);
 
a := hh(a, b, c, d, x[i+13], 4 , 681279174);
 
d := hh(d, a, b, c, x[i+ 0], 11, -358537222);
 
c := hh(c, d, a, b, x[i+ 3], 16, -722521979);
 
b := hh(b, c, d, a, x[i+ 6], 23, 76029189);
 
a := hh(a, b, c, d, x[i+ 9], 4 , -640364487);
 
d := hh(d, a, b, c, x[i+12], 11, -421815835);
 
c := hh(c, d, a, b, x[i+15], 16, 530742520);
 
b := hh(b, c, d, a, x[i+ 2], 23, -995338651);
 
 
 
a := ii(a, b, c, d, x[i+ 0], 6 , -198630844);
 
d := ii(d, a, b, c, x[i+ 7], 10, 1126891415);
 
c := ii(c, d, a, b, x[i+14], 15, -1416354905);
 
b := ii(b, c, d, a, x[i+ 5], 21, -57434055);
 
a := ii(a, b, c, d, x[i+12], 6 , 1700485571);
 
d := ii(d, a, b, c, x[i+ 3], 10, -1894986606);
 
c := ii(c, d, a, b, x[i+10], 15, -1051523);
 
b := ii(b, c, d, a, x[i+ 1], 21, -2054922799);
 
a := ii(a, b, c, d, x[i+ 8], 6 , 1873313359);
 
d := ii(d, a, b, c, x[i+15], 10, -30611744);
 
c := ii(c, d, a, b, x[i+ 6], 15, -1560198380);
 
b := ii(b, c, d, a, x[i+13], 21, 1309151649);
 
a := ii(a, b, c, d, x[i+ 4], 6 , -145523070);
 
d := ii(d, a, b, c, x[i+11], 10, -1120210379);
 
c := ii(c, d, a, b, x[i+ 2], 15, 718787259);
 
b := ii(b, c, d, a, x[i+ 9], 21, -343485551);
 
 
 
a := add(a, olda);
 
b := add(b, oldb);
 
c := add(c, oldc);
 
d := add(d, oldd);
 
 
 
inc(i,16);
 
end;
 
Result:= rhex(a) + rhex(b) + rhex(c) + rhex(d);
 
end;
 
 
 
end. 
 
 
 

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