Tuesday, March 20, 2018

DELPHI - How get hash value for file (SHA-1 fingerprint)

Hash function returns same value for same (in this case) file. This uses SHA-1 (Secure Hash Algorithm) algorithm.
uses IdHashMessageDigest;
...
var
  sFile : string;
  pSHA : TIdHashSHA1;
  pStream : TFileStream;
begin
  sFile := 'c:\_ax\error.png';

  pSHA := TIdHashSHA1.Create;
  pStream := TFileStream.Create( sFile, fmOpenRead or fmShareDenyWrite );

 try
   ShowMessage( 'File fingerprint = ' + pSHA.HashStreamAsHex( pStream ) );
 finally
   pStream.Free;
   pSHA.Free;
 end;
Output:

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