JavaScript

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.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

JavaScript

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

var 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.
crypt.HashAlgorithm = "sha256-tree-hash";

// Return the hash in lowercase hexidecimal format.
crypt.EncodingMode = "hexlower";

var treeHashHex = crypt.HashFileENC("qa_data/jpg/penguins.jpg");
console.log("SHA256 tree hash = " + treeHashHex);