(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 <C_CkCrypt2.h>

void ChilkatSample(void)
    {
    HCkCrypt2 crypt;
    const char *treeHashHex;

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

    crypt = CkCrypt2_Create();

    // 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.
    CkCrypt2_putHashAlgorithm(crypt,"sha256-tree-hash");

    // Return the hash in lowercase hexidecimal format.
    CkCrypt2_putEncodingMode(crypt,"hexlower");

    treeHashHex = CkCrypt2_hashFileENC(crypt,"qa_data/jpg/penguins.jpg");
    printf("SHA256 tree hash = %s\n",treeHashHex);


    CkCrypt2_Dispose(crypt);

    }