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(SQL Server) SOAP XML Digital Signature using RSA Key

Demonstrates how to sign content in a SOAP XML document using an RSA key.

This example requires Chilkat v9.5.0.69 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
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- This example requires the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    -- The SOAP XML to be signed in this example contains the following:

    -- <?xml version="1.0" encoding="UTF-8" standalone="no" ?>
    -- <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
    --     <SOAP-ENV:Header>
    --         <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" SOAP-ENV:mustUnderstand="1"></wsse:Security>
    --     </SOAP-ENV:Header>
    --     <SOAP-ENV:Body xmlns:SOAP-SEC="http://schemas.xmlsoap.org/soap/security/2000-12" SOAP-SEC:id="Body">
    --         <z:FooBar xmlns:z="http://example.com" />
    --     </SOAP-ENV:Body>
    -- </SOAP-ENV:Envelope>
    -- 

    -- The above XML is available at https://www.chilkatsoft.com/exampleData/soapToSign.xml
    -- Fetch the XML and then sign it..

    DECLARE @url nvarchar(4000)
    SELECT @url = 'https://www.chilkatsoft.com/exampleData/soapToSign.xml'
    DECLARE @http int
    -- Use "Chilkat_9_5_0.Http" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Http', @http OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @sbSoapXml int
    -- Use "Chilkat_9_5_0.StringBuilder" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sbSoapXml OUT

    DECLARE @success int
    EXEC sp_OAMethod @http, 'QuickGetSb', @success OUT, @url, @sbSoapXml
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @http, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @sbSoapXml
        RETURN
      END

    -- We'll need an RSA private key for signing.  
    -- There are many ways of getting an RSA private key using Chilkat.  This example
    -- will load one from a PEM file.
    DECLARE @rsaKey int
    -- Use "Chilkat_9_5_0.PrivateKey" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.PrivateKey', @rsaKey OUT

    EXEC sp_OAMethod @rsaKey, 'LoadPemFile', @success OUT, 'qa_data/rsa/rsaPrivKey_pkcs8.pem'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @rsaKey, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @sbSoapXml
        EXEC @hr = sp_OADestroy @rsaKey
        RETURN
      END

    -- To create the XML digital signature (i.e. embed the signature within
    -- the SOAP XML), we specify what is desired, and then call the method to 
    -- create the XML signature.
    -- 
    -- For example, the application must provide the following:
    --     - Where to put the signature.
    --     - What to sign.
    --     - The algorithms to be used.
    --     - The key to be used for signing.
    -- 

    DECLARE @xmlSigGen int
    -- Use "Chilkat_9_5_0.XmlDSigGen" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.XmlDSigGen', @xmlSigGen OUT

    -- In this example, we're going to put the signature within the wsse:Security element.
    -- To specify the location, set the SigLocation property to the XML path to this element,
    -- using vertical bar characters to separate tags.
    EXEC sp_OASetProperty @xmlSigGen, 'SigLocation', 'SOAP-ENV:Envelope|SOAP-ENV:Header|wsse:Security'

    -- An XML digital signature contains one or more references.  These are references to the parts
    -- of the XML document to be signed (a same document reference), or can be external references.
    -- This example will add a single same-document reference.  We'll add a reference to the XML fragment
    -- at SOAP-ENV:Body, which is indicated by providing the value of the "ID" attribute (where "ID" is case
    -- insensitive).  For each same-document reference, we must also indicate the hash algorithm and XML canonicalization
    -- algorithm to be used.  For this example we'll choose SHA-256 and Exclusive XML Canonicalization.
    EXEC sp_OAMethod @xmlSigGen, 'AddSameDocRef', @success OUT, 'Body', 'sha256', 'EXCL_C14N', '', ''

    -- Let's provide the RSA key to be used for signing:
    EXEC sp_OAMethod @xmlSigGen, 'SetPrivateKey', @success OUT, @rsaKey

    -- We're leaving the following properties at their default values:
    -- 
    --    - SigNamespacePrefix (default is "ds")
    --    - SigningAlg (for RSA keys. The default is PKCS1-v1_5, can be changed to RSASSA-PSS.)
    --    - SignedInfoCanonAlg  (default is EXCL_C14N)
    --    - SignedInfoDigestMethod (default is sha256)
    --    - KeyInfoType (default is "KeyValue", where the RSA public key is included in the Signature)

    -- Note: Each Reference has it's own specified algorithms for XML canonicalization and hashing,
    -- and the actual signature part (the SignedInfo) has it's own algorithms for the same.
    -- They may or may not be the same.  In this example, we use Exclusive XML Canonicalization and SHA-256 throughout.

    -- Finally, we're going to set one property that's optional, but commonly used.
    -- It's the SignedInfoPrefixList.  In this case, we're using Exclusive Canonicalization, and the signature
    -- will be placed in a location within the XML document where namespace prefixes are used in the ancestors.
    -- Specifically, the "wsse" and "SOAP-ENV" namespace prefixes are used.
    EXEC sp_OASetProperty @xmlSigGen, 'SignedInfoPrefixList', 'wsse SOAP-ENV'

    -- OK, everything's specified, so let's create the XML digital signature:
    -- This in-place signs the XML.  If successful, sbSoapXml will contain the 
    -- XML with the digital signature at the specified location.
    EXEC sp_OAMethod @xmlSigGen, 'CreateXmlDSigSb', @success OUT, @sbSoapXml
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @xmlSigGen, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @sbSoapXml
        EXEC @hr = sp_OADestroy @rsaKey
        EXEC @hr = sp_OADestroy @xmlSigGen
        RETURN
      END

    -- Examine the signed SOAP XML:
    EXEC sp_OAMethod @sbSoapXml, 'GetAsString', @sTmp0 OUT
    PRINT @sTmp0

    -- This is the signed SOAP XML.
    -- Chilkat emits the Signature in compact form on a single line.  Whitespace in XML signatures
    -- matters.  Chilkat's opinion is that writing the Signature without whitespace minimizes the chance
    -- for problems with whatever software might be verifying the signature.

    -- <?xml version="1.0" encoding="UTF-8" standalone="no" ?>
    -- <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
    --     <SOAP-ENV:Header>
    --         <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" SOAP-ENV:mustUnderstand="1"><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#"><InclusiveNamespaces xmlns="http://www.w3.org/2001/10/xml-exc-c14n#" PrefixList="wsse SOAP-ENV"/></ds:CanonicalizationMethod><ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="#Body"><ds:Transforms><ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/></ds:Transforms><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>OwgHPZNfDkXnZsjpfzXqAcT3RV3HzmTsEy2bP44FJ0M=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>C+7FWngUpJ33Q1yq8uuscjCyPN2IO4cJhpMv03Jrrht1V+4gvJQLIBk6HHjo1uPQyfYj6zji3pg+fOyGUptp17CsRvjCzSpP35vB2lEzHeS8dcY8XfrEtTP/0FNn75LmhhkOPy0wjWkgDVbgzhXpEk9az8r8fQVTM3vrcmXT+WdMWJXKBRFt6PLAhsFt0scOFTWAkLGyCwygzimDKX2nT63TOit9BigtIx7fPRuMkbybMKCGGABq2DiEbvrPOiN3SUYpyMNR9KehRAGN+OWnESaDC6DhOvbKR88XHkM+GeaRe9PWdrRHrwGfp3qgolKjR/wFRSa1YGSBKAhDJFBcdg==</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:Signature></wsse:Security>
    --     </SOAP-ENV:Header>
    --     <SOAP-ENV:Body xmlns:SOAP-SEC="http://schemas.xmlsoap.org/soap/security/2000-12" SOAP-SEC:id="Body">
    --         <z:FooBar xmlns:z="http://example.com" />
    --     </SOAP-ENV:Body>
    -- </SOAP-ENV:Envelope>

    -- Here's the signature part formatted for easier reading.
    -- (Adding whitespace to the SignedInfo breaks the signature, so you wouldn't want to do this..)

    --     <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#">
    --                 <InclusiveNamespaces xmlns="http://www.w3.org/2001/10/xml-exc-c14n#" PrefixList="wsse SOAP-ENV" />
    --             </ds:CanonicalizationMethod>
    --             <ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256" />
    --             <ds:Reference URI="#Body">
    --                 <ds:Transforms>
    --                     <ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#" />
    --                 </ds:Transforms>
    --                 <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256" />
    --                 <ds:DigestValue>OwgHPZNfDkXnZsjpfzXqAcT3RV3HzmTsEy2bP44FJ0M=</ds:DigestValue>
    --             </ds:Reference>
    --         </ds:SignedInfo>
    --         <ds:SignatureValue>C+7FWngUp....BKAhDJFBcdg==</ds:SignatureValue>
    --         <ds:KeyInfo>
    --             <ds:KeyValue>
    --                 <ds:RSAKeyValue>
    --                     <ds:Modulus>sXeRhM55P13FbpNcXAMR....MYmDBjNAcibRw==</ds:Modulus>
    --                     <ds:Exponent>AQAB</ds:Exponent>
    --                 </ds:RSAKeyValue>
    --             </ds:KeyValue>
    --         </ds:KeyInfo>
    --     </ds:Signature>

    EXEC @hr = sp_OADestroy @http
    EXEC @hr = sp_OADestroy @sbSoapXml
    EXEC @hr = sp_OADestroy @rsaKey
    EXEC @hr = sp_OADestroy @xmlSigGen


END
GO

 

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