(SQL Server) 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.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    -- This example requires the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    DECLARE @crypt int
    -- Use "Chilkat_9_5_0.Crypt2" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Crypt2', @crypt OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- 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.
    EXEC sp_OASetProperty @crypt, 'HashAlgorithm', 'sha256-tree-hash'

    -- Return the hash in lowercase hexidecimal format.
    EXEC sp_OASetProperty @crypt, 'EncodingMode', 'hexlower'

    DECLARE @treeHashHex nvarchar(4000)
    EXEC sp_OAMethod @crypt, 'HashFileENC', @treeHashHex OUT, 'qa_data/jpg/penguins.jpg'

    PRINT 'SHA256 tree hash = ' + @treeHashHex

    EXEC @hr = sp_OADestroy @crypt


END
GO