SQL Server

ITIDA Canonicalize JSON and Compute SHA256 Hash

See more Egypt ITIDA Examples

Demonstrates creating the canonical (ITIDA) version of a JSON document, and then computes the SHA256 hash of the canonicalized JSON. SQL Server

--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

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

    --  Load the JSON containing the document to be signed.

    --  The JSON file should look like this:
    --  NOTE: The JSON should NOT begin with "{ "documents" : [ ..."

    --        {
    --           "issuer":{
    --              "address":{
    --                 "branchID":"0",
    --                 "country":"EG",
    --                 "regionCity":"Cairo",
    --                 "postalCode":"",
    --                 "buildingNumber":"0",
    --                 "street":"123rd Street",
    --                 "governate":"GOVERNATE"
    --              },
    --              "type":"B",
    --              "id":"209999899",
    --              "name":"Xyz SAE"
    --           },
    --  ...
    --  ...

    DECLARE @sb int
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sb OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    EXEC sp_OAMethod @sb, 'LoadFile', @success OUT, 'my_invoice.json', 'utf-8'
    IF @success = 0
      BEGIN

        PRINT 'Failed to load input file.'
        EXEC @hr = sp_OADestroy @sb
        RETURN
      END

    --  Convert the contents of sb to the ITIDA canonical form.
    --  Always pass utf-8 for the 2nd arg.
    EXEC sp_OAMethod @sb, 'Encode', @success OUT, 'itida', 'utf-8'

    --  Examine the canonicalized JSON
    EXEC sp_OAMethod @sb, 'GetAsString', @sTmp0 OUT
    PRINT @sTmp0

    --  Compute the SHA256 hash and show the SHA256 in hex format

    EXEC sp_OAMethod @sb, 'GetHash', @sTmp0 OUT, 'sha256', 'hex', 'utf-8'
    PRINT 'SHA256 hash: ' + @sTmp0

    EXEC @hr = sp_OADestroy @sb


END
GO