(Tcl) 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.

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load ./chilkat.dll

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

set crypt [new_CkCrypt2]

# 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_put_HashAlgorithm $crypt "sha256-tree-hash"

# Return the hash in lowercase hexidecimal format.
CkCrypt2_put_EncodingMode $crypt "hexlower"

set treeHashHex [CkCrypt2_hashFileENC $crypt "qa_data/jpg/penguins.jpg"]
puts "SHA256 tree hash = $treeHashHex"

delete_CkCrypt2 $crypt