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

    let crypt = CkoCrypt2()!

    // 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"

    var treeHashHex: String? = crypt.hashFileENC("qa_data/jpg/penguins.jpg")
    print("SHA256 tree hash = \(treeHashHex!)")

}