C++

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.

C++

#include <CkCrypt2.h>

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

    CkCrypt2 crypt;

    // 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.put_HashAlgorithm("sha256-tree-hash");

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

    const char *treeHashHex = crypt.hashFileENC("qa_data/jpg/penguins.jpg");
    std::cout << "SHA256 tree hash = " << treeHashHex << "\r\n";
    }