(Unicode C++) 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.

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#include <CkCrypt2W.h>

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

    CkCrypt2W 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(L"sha256-tree-hash");

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

    const wchar_t *treeHashHex = crypt.hashFileENC(L"qa_data/jpg/penguins.jpg");
    wprintf(L"SHA256 tree hash = %s\n",treeHashHex);
    }