Java

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.

Chilkat2 Java

import com.chilkatsoft.chilkat2.Crypt2;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        Crypt2 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.setHashAlgorithm("sha256-tree-hash");

        // Return the hash in lowercase hexidecimal format.
        crypt.setEncodingMode("hexlower");

        String treeHashHex = crypt.hashFileENC("qa_data/jpg/penguins.jpg");
        System.out.println("SHA256 tree hash = " + treeHashHex);
    }
}