DataFlex

Compute Glacier SHA256 Tree Hash of a File

See more Amazon Glacier Examples

Computes the Amazon Glacier SHA256 tree hash for a file.

Note: This example requires Chilkat v9.5.0.78 or greater.

DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoCrypt
    String sTreeHashHex

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    Get Create (RefClass(cComChilkatCrypt2)) To hoCrypt
    If (Not(IsComObjectCreated(hoCrypt))) Begin
        Send CreateComObject of hoCrypt
    End

    // 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.
    Set ComHashAlgorithm Of hoCrypt To "sha256-tree-hash"

    // Return the hash in lowercase hexidecimal format.
    Set ComEncodingMode Of hoCrypt To "hexlower"

    Get ComHashFileENC Of hoCrypt "qa_data/jpg/penguins.jpg" To sTreeHashHex
    Showln "SHA256 tree hash = " sTreeHashHex


End_Procedure