B4X

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.

B4X

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

Dim crypt As ChilkatCrypt2
crypt.Initialize("crypt")

'  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 = crypt.HashFileENC("qa_data/jpg/penguins.jpg")
Log("SHA256 tree hash = " & treeHashHex)