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Delphi7实现MD5

delphi7里带了标准的MD5算法，单元文件IdHashMessageDigest.pas

例子：

uses
  IdHashMessageDigest;//MD5计算

function MD5(CheckStr:string):String; //CheckStr为待加密的文件路路径。
var
  MyMD5: TIdHashMessageDigest5;
begin
  

  MyMD5:=TIdHashMessageDigest5.Create;

  Result:=MyMD5.AsHex(MyMD5.HashValue(TFileStream.Create(CheckStr,fmOpenRead or fmSharedenyNone))); 

  

  MyMD5.Free; 

end;