unit untCheckCode;  
 
 interface  
 
 function GetFile_MD5(const iFileName: String): String;  // 获取文件MD5  
 function GetFile_CRC(const iFileName: String): String;  // 获取文件CRC  
 function GetFile_SHA1(const iFileName: String): String;  // 获取文件SHA1  
 function GetFile_SHA256(const iFileName: String): String; // 获取文件SHA256  
 function GetFile_SHA384(const iFileName: String): String; // 获取文件SHA384  
 function GetFile_SHA512(const iFileName: String): String; // 获取文件SHA512  
 
 implementation  
 
   uses IdHashMessageDigest, Classes, IdHashCRC, IdHashSHA, IdSSLOpenSSLHeaders;
    
 var  
 FOpenSSLLoad: Boolean;  
 
function GetFile_MD5(const iFileName: string): String;
var
  MemSteam: TMemoryStream;
  MyMD5   : TIdHashMessageDigest5;
begin
  MemSteam := TMemoryStream.Create;
  MemSteam.LoadFromFile(iFileName);
  MyMD5  := TIdHashMessageDigest5.Create;
  Result := MyMD5.HashStreamAsHex(MemSteam);
  MyMD5.Free;
  MemSteam.Free;
end;
 
 function GetFile_CRC(const iFileName: String): String;  
 var  
 crc  : TIdHashCRC32;  
 fileStream: TMemoryStream;  
 begin  
 crc  := TIdHashCRC32.Create;  
 fileStream := TMemoryStream.Create;  
 try  
 fileStream.LoadFromFile(iFileName);  
 Result := crc.HashStreamAsHex(fileStream);  
 finally  
 fileStream.Free;  
 crc.Free;  
 end;  
 end;  
 
 function GetFile_SHA1(const iFileName: String): String;  
 var  
 SHA1  : TIdHashSHA1;  
 fileStream: TMemoryStream;  
 begin  
 SHA1  := TIdHashSHA1.Create;  
 fileStream := TMemoryStream.Create;  
 try  
 fileStream.LoadFromFile(iFileName);  
 Result := SHA1.HashStreamAsHex(fileStream);  
 finally  
 fileStream.Free;  
 SHA1.Free;  
 end;  
 end;  
 
 function GetFile_SHA256(const iFileName: String): String;  
 var  
 SHA256  : TIdHashSHA256;  
 fileStream: TMemoryStream;  
 begin  
 if FOpenSSLLoad then  
 begin  
 SHA256  := TIdHashSHA256.Create;  
 fileStream := TMemoryStream.Create;  
 try  
 fileStream.LoadFromFile(iFileName);  
 Result := SHA256.HashStreamAsHex(fileStream);  
 finally  
 fileStream.Free;  
 SHA256.Free;  
 end;  
 end  
 else  
 begin  
 Result := 'Error';  
 end;  
 end;  
 
 function GetFile_SHA384(const iFileName: String): String;  
 var  
 SHA384  : TIdHashSHA384;  
 fileStream: TMemoryStream;  
 begin  
 if FOpenSSLLoad then  
 begin  
 SHA384  := TIdHashSHA384.Create;  
 fileStream := TMemoryStream.Create;  
 try  
 fileStream.LoadFromFile(iFileName);  
 Result := SHA384.HashStreamAsHex(fileStream);  
 finally  
 fileStream.Free;  
 SHA384.Free;  
 end;  
 end  
 else  
 begin  
 Result := 'Error';  
 end;  
 end;  
 
 function GetFile_SHA512(const iFileName: String): String;  
 var  
 SHA512  : TIdHashSHA512;  
 fileStream: TMemoryStream;  
 begin  
 if FOpenSSLLoad then  
 begin  
 SHA512  := TIdHashSHA512.Create;  
 fileStream := TMemoryStream.Create;  
 try  
 fileStream.LoadFromFile(iFileName);  
 Result := SHA512.HashStreamAsHex(fileStream);  
 finally  
 fileStream.Free;  
 SHA512.Free;  
 end;  
 end  
 else  
 begin  
 Result := 'Error';  
 end;  
 end;  
 
 initialization  
 
 FOpenSSLLoad := IdSSLOpenSSLHeaders.Load();  
 
 end.