(Visual FoxPro) Compute Glacier SHA256 Tree Hash of a File

Computes the Amazon Glacier SHA256 tree hash for a file.

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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loCrypt
LOCAL lcTreeHashHex

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

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Crypt2')
loCrypt = CreateObject('Chilkat.Crypt2')

* 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.
loCrypt.HashAlgorithm = "sha256-tree-hash"

* Return the hash in lowercase hexidecimal format.
loCrypt.EncodingMode = "hexlower"

lcTreeHashHex = loCrypt.HashFileENC("qa_data/jpg/penguins.jpg")
? "SHA256 tree hash = " + lcTreeHashHex

RELEASE loCrypt