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(Delphi ActiveX) Compute Glacier SHA256 Tree Hash of a FileComputes the Amazon Glacier SHA256 tree hash for a file. Note: This example requires Chilkat v9.5.0.78 or greater.
uses Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB; ... procedure TForm1.Button1Click(Sender: TObject); var crypt: TChilkatCrypt2; treeHashHex: WideString; begin // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. crypt := TChilkatCrypt2.Create(Self); // For more information about Amazon Glacier tree hashes, see Computing Glacier Checksums // Chilkat added the "sha256-tree-hash" algorithm in v9.5.0.78 to make it easy to compute the Glacier tree hash checksum // of a file or from bytes in memory. crypt.HashAlgorithm := 'sha256-tree-hash'; // Return the hash in lowercase hexidecimal format. crypt.EncodingMode := 'hexlower'; treeHashHex := crypt.HashFileENC('qa_data/jpg/penguins.jpg'); Memo1.Lines.Add('SHA256 tree hash = ' + treeHashHex); end; |
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