> I've searched the Net but not found some simple Delphi source to encrypt a
> string (based on a given key value). I've only found large component sets
> which are an overkill.
here is my favourite, very simple string to hex gobbledegooker.
Function Encrypt (Src:String; Key:String; Encrypt : Boolean):string;
var
idx :integer;
KeyLen :Integer;
KeyPos :Integer;
offset :Integer;
dest :string;
SrcPos :Integer;
SrcAsc :Integer;
TmpSrcAsc :Integer;
Range :Integer;
begin
KeyLen:=Length(Key);
if KeyLen = 0 then key:='235jhsf9msf;&#@*#';
KeyPos:=0;
SrcAsc:=0;
Range:=256;
if Encrypt then
begin
Randomize;
offset:=Random(Range);
dest:=format('%1.2x',[offset]);
for SrcPos := 1 to Length(Src) do
begin
SrcAsc:=(Ord(Src[SrcPos]) + offset) MOD 255;
if KeyPos < KeyLen then KeyPos:= KeyPos + 1 else KeyPos:=1;
SrcAsc:= SrcAsc xor Ord(Key[KeyPos]);
dest:=dest + format('%1.2x',[SrcAsc]);
offset:=SrcAsc;
end;
end
else
begin
offset:=StrToInt('$'+ copy(src,1,2));
SrcPos:=3;
repeat
SrcAsc:=StrToInt('$'+ copy(src,SrcPos,2));
if KeyPos < KeyLen Then KeyPos := KeyPos + 1 else KeyPos := 1;
TmpSrcAsc := SrcAsc xor Ord(Key[KeyPos]);
if TmpSrcAsc <= offset then
TmpSrcAsc := 255 + TmpSrcAsc - offset
else
TmpSrcAsc := TmpSrcAsc - offset;
dest := dest + chr(TmpSrcAsc);
offset:=srcAsc;
SrcPos:=SrcPos + 2;
until SrcPos >= Length(Src);
end;
Result:=Dest;
end;
----------------------------------------------------------
Phil Scadden, Institute of Geological and Nuclear Sciences
41 Bell Rd South, PO Box 30368, Lower Hutt, New Zealand
Ph +64 4 5704821, fax +64 4 5704603
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