PHP ActiveX

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.

PHP ActiveX

<?php

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

$crypt = new COM("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.
$crypt->HashAlgorithm = 'sha256-tree-hash';

// Return the hash in lowercase hexidecimal format.
$crypt->EncodingMode = 'hexlower';

$treeHashHex = $crypt->hashFileENC('qa_data/jpg/penguins.jpg');
print 'SHA256 tree hash = ' . $treeHashHex . "\n";

?>