SQL Server

Verify HMAC XML Digital Signature

See more XML Digital Signatures Examples

Demonstrates how to validate an XML digital signature signed with an HMAC key. SQL Server

-- 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)
    DECLARE @success int
    SELECT @success = 0

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

    -- The XML containing the Signature to be verified contains the following:

    -- <?xml version="1.0" encoding="UTF-8" standalone="no"?>
    -- <collection Id="root">
    -- 	<album>
    -- 		<title>Questions, unanswered</title>
    -- 		<artist>Steve and the flubberblubs</artist>
    -- 		<year>1989</year>
    -- 		<t:tracks xmlns:t="http://test.xades4j/tracks">
    -- 			<t:song length="4:05" tracknumber="1">
    -- 				<t:title>What do you know?</t:title>
    -- 				<t:artist>Steve and the flubberblubs</t:artist>
    -- 				<t:lastplayed>2006-10-17-08:31</t:lastplayed>
    -- 			</t:song>
    -- 			<t:song length="3:45" tracknumber="2">
    -- 				<t:title>Who do you know?</t:title>
    -- 				<t:artist>Steve and the flubberblubs</t:artist>
    -- 				<t:lastplayed>2006-10-17-08:35</t:lastplayed>
    -- 			</t:song>
    -- 			<t:song length="5:14" tracknumber="3">
    -- 				<t:title>When do you know?</t:title>
    -- 				<t:artist>Steve and the flubberblubs</t:artist>
    -- 				<t:lastplayed>2006-10-17-08:39</t:lastplayed>
    -- 			</t:song>
    -- 			<t:song length="4:19" tracknumber="4">
    -- 				<t:title>Do you know?</t:title>
    -- 				<t:artist>Steve and the flubberblubs</t:artist>
    -- 				<t:lastplayed>2006-10-17-08:44</t:lastplayed>
    -- 			</t:song>
    -- 		</t:tracks>
    -- 	</album>
    -- <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#hmac-sha256"/><ds:Reference URI="#root"><ds:Transforms><ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/></ds:Transforms><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>rD/g8soqKz8EiPUBhEWfcQacS0ta4ULHX3dKMEH6ZoQ=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>R8dXP95VRYJBfL6d0Peogybdk27+R+JIfX8jnVu0NOI=</ds:SignatureValue></ds:Signature></collection>

    -- The above XML is available at https://www.chilkatsoft.com/exampleData/hmacSigned.xml
    -- First fetch the XML..

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

    DECLARE @sbXml int
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sbXml OUT

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

    DECLARE @verifier int
    EXEC @hr = sp_OACreate 'Chilkat.XmlDSig', @verifier OUT

    -- Load the XML containing the signature to be verified.
    EXEC sp_OAMethod @verifier, 'LoadSignatureSb', @success OUT, @sbXml
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @verifier, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @sbXml
        EXEC @hr = sp_OADestroy @verifier
        RETURN
      END

    -- Provide the HMAC key
    -- The HMAC key for this signature is the us-ascii bytes of the string "secret",
    -- It can be set in any of the following ways (and also more ways not shown here..)
    EXEC sp_OAMethod @verifier, 'SetHmacKey', @success OUT, 'secret', 'ascii'
    -- or
    EXEC sp_OAMethod @verifier, 'SetHmacKey', @success OUT, 'c2VjcmV0', 'base64'
    -- or
    EXEC sp_OAMethod @verifier, 'SetHmacKey', @success OUT, '736563726574', 'hex'

    -- Verify the signature
    DECLARE @bVerified int
    EXEC sp_OAMethod @verifier, 'VerifySignature', @bVerified OUT, 1

    PRINT 'Signature verified = ' + @bVerified

    EXEC @hr = sp_OADestroy @http
    EXEC @hr = sp_OADestroy @sbXml
    EXEC @hr = sp_OADestroy @verifier


END
GO