Validate a JWS with a Public Key

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetPublicKey, which sets the public key used to validate a signature of a loaded JWS.

The file path is relative to the application's current working directory. An absolute path may also be used. Supply the path appropriate to your own environment.

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

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

    --  Load the JWS compact serialization.
    DECLARE @jwsCompact nvarchar(4000)
    SELECT @jwsCompact = 'eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>'
    EXEC sp_OAMethod @jws, 'LoadJws', @success OUT, @jwsCompact
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @jws, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @jws
        RETURN
      END

    --  The file path is relative to the application's current working directory.  An absolute path
    --  may also be used.  Supply the path appropriate to your own environment.
    --  Load the signer's public key and set it for validating signature 0.
    DECLARE @pubKey int
    EXEC @hr = sp_OACreate 'Chilkat.PublicKey', @pubKey OUT

    EXEC sp_OAMethod @pubKey, 'LoadFromFile', @success OUT, 'qa_data/signer_pubkey.pem'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @pubKey, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @jws
        EXEC @hr = sp_OADestroy @pubKey
        RETURN
      END
    EXEC sp_OAMethod @jws, 'SetPublicKey', @success OUT, 0, @pubKey
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @jws, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @jws
        EXEC @hr = sp_OADestroy @pubKey
        RETURN
      END

    --  Validate the signature.  Validate returns 1 when valid, 0 when not, or a negative value on error.
    DECLARE @v int
    EXEC sp_OAMethod @jws, 'Validate', @v OUT, 0
    IF @v < 0
      BEGIN
        EXEC sp_OAGetProperty @jws, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @jws
        EXEC @hr = sp_OADestroy @pubKey
        RETURN
      END
    IF @v <> 1
      BEGIN

        PRINT 'The signature is not valid.'
        EXEC @hr = sp_OADestroy @jws
        EXEC @hr = sp_OADestroy @pubKey
        RETURN
      END

    PRINT 'The signature is valid.'

    EXEC @hr = sp_OADestroy @jws
    EXEC @hr = sp_OADestroy @pubKey


END
GO