PureBasic

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.

PureBasic

IncludeFile "CkCrypt2.pb"

Procedure ChilkatExample()

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

    crypt.i = CkCrypt2::ckCreate()
    If crypt.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; 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.
    CkCrypt2::setCkHashAlgorithm(crypt, "sha256-tree-hash")

    ; Return the hash in lowercase hexidecimal format.
    CkCrypt2::setCkEncodingMode(crypt, "hexlower")

    treeHashHex.s = CkCrypt2::ckHashFileENC(crypt,"qa_data/jpg/penguins.jpg")
    Debug "SHA256 tree hash = " + treeHashHex


    CkCrypt2::ckDispose(crypt)


    ProcedureReturn
EndProcedure