React Native

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.

React Native

import { Crypt2 } from '@chilkat/react-native'

async function chilkatExample() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  const crypt = new 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';

  const treeHashHex = await crypt.hashFileENCAsync('qa_data/jpg/penguins.jpg');
  console.log(`SHA256 tree hash = ${treeHashHex}`);
}