(SQL Server) POP3 Verify Signed (S/MIME) Email

Demonstrates how to download and verify digitally signed S/MIME email.

Note: This example requires Chilkat v11.0.0 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
    DECLARE @iTmp0 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.

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

    -- Set the POP3 server's hostname
    EXEC sp_OASetProperty @mailman, 'MailHost', 'pop.example.com'

    -- Set the POP3 login/password.
    EXEC sp_OASetProperty @mailman, 'PopUsername', 'myLogin'
    EXEC sp_OASetProperty @mailman, 'PopPassword', 'myPassword'

    DECLARE @stUidls int
    EXEC @hr = sp_OACreate 'Chilkat.StringTable', @stUidls OUT

    EXEC sp_OAMethod @mailman, 'FetchUidls', @success OUT, @stUidls
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @mailman, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @mailman
        EXEC @hr = sp_OADestroy @stUidls
        RETURN
      END

    DECLARE @email int
    EXEC @hr = sp_OACreate 'Chilkat.Email', @email OUT

    DECLARE @cert int
    EXEC @hr = sp_OACreate 'Chilkat.Cert', @cert OUT

    DECLARE @count int
    EXEC sp_OAGetProperty @stUidls, 'Count', @count OUT
    DECLARE @i int
    SELECT @i = 0
    WHILE @i < @count
      BEGIN
        -- Download the full email.
        EXEC sp_OAMethod @stUidls, 'StringAt', @sTmp0 OUT, @i
        EXEC sp_OAMethod @mailman, 'FetchByUidl', @success OUT, @sTmp0, 0, 0, @email
        IF @success = 0
          BEGIN
            EXEC sp_OAGetProperty @mailman, 'LastErrorText', @sTmp0 OUT
            PRINT @sTmp0
            EXEC @hr = sp_OADestroy @mailman
            EXEC @hr = sp_OADestroy @stUidls
            EXEC @hr = sp_OADestroy @email
            EXEC @hr = sp_OADestroy @cert
            RETURN
          END


        PRINT @i

        EXEC sp_OAGetProperty @email, 'From', @sTmp0 OUT
        PRINT 'From: ' + @sTmp0

        EXEC sp_OAGetProperty @email, 'Subject', @sTmp0 OUT
        PRINT 'Subject: ' + @sTmp0

        -- The security layers of signed and/or encrypted emails
        -- are automatically "unwrapped" when loaded into
        -- a Chilkat email object.
        -- An application only needs to check to see if an email
        -- was received signed or encrypted, and then examine
        -- the success/failure.  For example:
        EXEC sp_OAGetProperty @email, 'ReceivedSigned', @iTmp0 OUT
        IF @iTmp0 = 1
          BEGIN


            PRINT 'This email was signed.'

            -- Check to see if the signatures were verified.
            EXEC sp_OAGetProperty @email, 'SignaturesValid', @iTmp0 OUT
            IF @iTmp0 = 1
              BEGIN

                PRINT 'Digital signature(s) verified.'

                EXEC sp_OAGetProperty @email, 'SignedBy', @sTmp0 OUT
                PRINT 'Signer: ' + @sTmp0

                EXEC sp_OAMethod @email, 'LastSignerCert', @success OUT, 0, @cert
                IF @success = 0
                  BEGIN
                    EXEC sp_OAGetProperty @email, 'LastErrorText', @sTmp0 OUT
                    PRINT @sTmp0
                    EXEC @hr = sp_OADestroy @mailman
                    EXEC @hr = sp_OADestroy @stUidls
                    EXEC @hr = sp_OADestroy @email
                    EXEC @hr = sp_OADestroy @cert
                    RETURN
                  END


                EXEC sp_OAGetProperty @cert, 'SubjectCN', @sTmp0 OUT
                PRINT 'Signing cert: ' + @sTmp0
              END

          END
        ELSE
          BEGIN

            PRINT 'Digital signature verification failed.'
          END

        SELECT @i = @i + 1
      END

    EXEC sp_OAMethod @mailman, 'Pop3EndSession', @success OUT

    EXEC @hr = sp_OADestroy @mailman
    EXEC @hr = sp_OADestroy @stUidls
    EXEC @hr = sp_OADestroy @email
    EXEC @hr = sp_OADestroy @cert


END
GO