(SQL Server) Create Enveloping XML Signature with Multiple References

Demonstrates how to create an enveloping XML digital signature containing multiple Object references.

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
    DECLARE @sTmp0 nvarchar(4000)
    -- This example requires the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    -- This example creates an XML signature that contains three Objects:
    -- 
    -- 1. A base64 encoded JPG image.
    -- 2. Some plain text.
    -- 3. Some JSON.
    -- 

    -- Get a small JPG image.
    DECLARE @jpgData int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.BinData', @jpgData OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @http int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Http', @http OUT

    DECLARE @success int
    EXEC sp_OAMethod @http, 'QuickGetBd', @success OUT, 'https://www.chilkatsoft.com/images/starfish.jpg', @jpgData
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @http, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @jpgData
        EXEC @hr = sp_OADestroy @http
        RETURN
      END

    -- Get a small JSON document.
    DECLARE @sbJson int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.StringBuilder', @sbJson OUT

    EXEC sp_OAMethod @http, 'QuickGetSb', @success OUT, 'https://www.chilkatsoft.com/exampleData/sample.json', @sbJson
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @http, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @jpgData
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @sbJson
        RETURN
      END

    -- Get an RSA private key for signing.
    DECLARE @sbPem int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.StringBuilder', @sbPem OUT

    EXEC sp_OAMethod @http, 'QuickGetSb', @success OUT, 'https://www.chilkatdownload.com/example_data/rsaprivkey_secret.pem', @sbPem
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @http, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @jpgData
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @sbJson
        EXEC @hr = sp_OADestroy @sbPem
        RETURN
      END

    DECLARE @rsaKey int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.PrivateKey', @rsaKey OUT

    EXEC sp_OAMethod @sbPem, 'GetAsString', @sTmp0 OUT
    EXEC sp_OAMethod @rsaKey, 'LoadEncryptedPem', @success OUT, @sTmp0, 'secret'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @rsaKey, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @jpgData
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @sbJson
        EXEC @hr = sp_OADestroy @sbPem
        EXEC @hr = sp_OADestroy @rsaKey
        RETURN
      END

    -- OK.. ready to begin building the signature.
    DECLARE @gen int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.XmlDSigGen', @gen OUT

    -- Provide the RSA key to the XML Digital Signature generator
    EXEC sp_OAMethod @gen, 'SetPrivateKey', @success OUT, @rsaKey

    -- Add enveloped references to the content to be signed.
    DECLARE @sbContent int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.StringBuilder', @sbContent OUT

    EXEC sp_OAMethod @sbContent, 'Append', @success OUT, 'The quick brown fox jumped over the lazy dog.'
    EXEC sp_OAMethod @gen, 'AddEnvelopedRef', @success OUT, 'aaa', @sbContent, 'sha256', 'C14N', ''

    EXEC sp_OAMethod @gen, 'AddEnvelopedRef', @success OUT, 'bbb', @sbJson, 'sha256', 'C14N', ''

    DECLARE @sbBase64 int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.StringBuilder', @sbBase64 OUT

    -- Use "base64_mime" to encode the JPG data to base64 in multiple lines.
    EXEC sp_OAMethod @jpgData, 'GetEncodedSb', @success OUT, 'base64_mime', @sbBase64
    EXEC sp_OAMethod @gen, 'AddEnvelopedRef', @success OUT, 'ccc', @sbBase64, 'sha256', 'C14N', ''

    -- Generate the XML digital signature.
    DECLARE @sbXml int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.StringBuilder', @sbXml OUT

    EXEC sp_OAMethod @gen, 'CreateXmlDSigSb', @success OUT, @sbXml
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @gen, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @jpgData
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @sbJson
        EXEC @hr = sp_OADestroy @sbPem
        EXEC @hr = sp_OADestroy @rsaKey
        EXEC @hr = sp_OADestroy @gen
        EXEC @hr = sp_OADestroy @sbContent
        EXEC @hr = sp_OADestroy @sbBase64
        EXEC @hr = sp_OADestroy @sbXml
        RETURN
      END

    -- Examine the enveloped signature, where the data for each reference is contained within the XML Signature
    EXEC sp_OAMethod @sbXml, 'GetAsString', @sTmp0 OUT
    PRINT @sTmp0

    -- The exact XML signature looks like this:
    -- (A pretty-printed XML signature is shown further below, but beware that the introduced whitespace breaks the signature.)

    -- <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#"><ds:SignedInfo><ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/><ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="#aaa"><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>f0KK1a9yt2XMxCcr5Keziiv4BpAev/rRt/CGSJwS9i0=</ds:DigestValue></ds:Reference><ds:Reference URI="#bbb"><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>buBASaqBjJXez8r/hFz4ZIIf+1mgf63AoI8MihViJtU=</ds:DigestValue></ds:Reference><ds:Reference URI="#ccc"><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>+9PN/3Bz7xOuqi/wIBlGHEwPx+YUoILMsr2Iu0i1cCU=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>fI9l6/CKuwa7J2cczBzsKTOKec6cOVX/ehY2RcDZreGJlSo8bgv++nliFTwPyiZ8GT1Q2rDrA8biOt/ysZWnfim6AR79ld9CtLuKdqNsS/aSjwroDG/eWM0447zWoDSgAIsjXUAsF5xLschFW7+pGoPl5S1fVT/PUBkySlBi0I/U8P2UdiY8GoAL2rkHxTxDHaWh1GpBY28o9MSCuTgTiLVHF6WbmdHggqMc70OSTRh5vCMzZRTaAkTH6SWYt2WczKwmVea7hkM3BhpbA3EnpEIxK7TFl2GkFGXxAyXAxe2SVmXngt025LOFtU72fE+eChbqr5tejWl81z1g2F7ZnQ==</ds:SignatureValue><ds:KeyInfo><ds:KeyValue><ds:RSAKeyValue><ds:Modulus>sXeRhM55P13FbpNcXAMR3olbw2Wa6keZIHu5YTZYUBTlYWId+pNiwUz3zFIEo+0IfYR0H27ybIycQO+1IIzJofUFNMAL3tZps2OKPlsjuCPls6kXpXhv/gvhux8LrCtp4PcKWqJ6QVOZKChc7WAx40qFWzHi57ueqRTv3x0kESqGg/VjsqyTEvb55psJO2RsfhLT7+YVh3hImRM3RDaJdkTkPuOxeFyT6N7VXD09329sLuS3QkUbE9zEKDnz9X3d8dEQdJhSI9ba5fxl8R7fu8pB67ElfzFml96X1jLFtzy1pzOT5Fc4ROcaqlYckVzdBq9sxezm6MYmDBjNAcibRw==</ds:Modulus><ds:Exponent>AQAB</ds:Exponent></ds:RSAKeyValue></ds:KeyValue></ds:KeyInfo><ds:Object Id="aaa">The quick brown fox jumped over the lazy dog.</ds:Object><ds:Object Id="bbb">{
    --    "apple": "red",
    --    "lime": "green",
    --    "banana": "yellow",
    --    "broccoli": "green",
    --    "strawberry": "red"
    -- }
    -- </ds:Object><ds:Object Id="ccc">/9j/4AAQSkZJRgABAgEASABIAAD/7Q18UGhvdG9zaG9wIDMuMAA4QklNA+0AAAAAABAASAAAAAEA
    -- AQBIAAAAAQABOEJJTQPzAAAAAAAIAAAAAAAAAAE4QklNBAoAAAAAAAEAADhCSU0nEAAAAAAACgAB
    -- AAAAAAAAAAI4QklNA/UAAAAAAEgAL2ZmAAEAbGZmAAYAAAAAAAEAL2ZmAAEAoZmaAAYAAAAAAAEA
    -- MgAAAAEAWgAAAAYAAAAAAAEANQAAAAEALQAAAAYAAAAAAAE4QklNBBQAAAAAAAQAAAABOEJJTQQM
    -- AAAAAAyTAAAAAQAAAIAAAACAAAABgAAAwAAAAAx3ABgAAf/Y/+AAEEpGSUYAAQIBAEgASAAA//4A
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    -- AwIDBgAAAAAAAAAAAAAAAP/bAIQADAgICAkIDAkJDBELCgsRFQ8MDA8VGBMTFRMTGBEMDAwMDAwR
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    -- f5fnr2W1+0aGrcQ+vo//2Q==</ds:Object>
    -- </ds:Signature>
    -- 
    -- 

    EXEC @hr = sp_OADestroy @jpgData
    EXEC @hr = sp_OADestroy @http
    EXEC @hr = sp_OADestroy @sbJson
    EXEC @hr = sp_OADestroy @sbPem
    EXEC @hr = sp_OADestroy @rsaKey
    EXEC @hr = sp_OADestroy @gen
    EXEC @hr = sp_OADestroy @sbContent
    EXEC @hr = sp_OADestroy @sbBase64
    EXEC @hr = sp_OADestroy @sbXml


END
GO