(Visual Basic 6.0) 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

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

Dim crypt As New ChilkatCrypt2

' 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"

Dim treeHashHex As String
treeHashHex = crypt.HashFileENC("qa_data/jpg/penguins.jpg")
Debug.Print "SHA256 tree hash = " & treeHashHex