SQL Server

Find Certificate for Email Encryption

Demonstrates finding the recipient's certificate in the Windows certificate store and using it to send encrypted email. 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.

    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 SMTP server.
    EXEC sp_OASetProperty @mailman, 'SmtpHost', 'smtp.example.com'

    -- Create a new email object
    DECLARE @email int
    EXEC @hr = sp_OACreate 'Chilkat.Email', @email OUT

    EXEC sp_OASetProperty @email, 'Subject', 'This email is encrypted'
    EXEC sp_OASetProperty @email, 'Body', 'This is a digitally encrypted mail'
    EXEC sp_OASetProperty @email, 'From', 'Joe <joe@example.com>'
    -- Emails are encrypted using the recipient's certificate.
    DECLARE @recipientEmailAddr nvarchar(4000)
    SELECT @recipientEmailAddr = 'jane@example2.com'
    EXEC sp_OAMethod @email, 'AddTo', @success OUT, 'Jane', @recipientEmailAddr

    -- Indicate that the email is to be sent encrypted.
    EXEC sp_OASetProperty @email, 'SendEncrypted', 1

    -- This example demonstrates finding the email encryption certificate
    -- on a Windows system where the certificate is stored in the Windows 
    -- certificate store.

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

    -- The recipient's certificate is used to encrypt.
    -- (Because the recipient is the only one in possession of the private key to decrypt.)
    EXEC sp_OAMethod @cert, 'LoadByEmailAddress', @success OUT, @recipientEmailAddr
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @cert, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @mailman
        EXEC @hr = sp_OADestroy @email
        EXEC @hr = sp_OADestroy @cert
        RETURN
      END

    -- Specify the certificate to be used for encryption.
    EXEC sp_OAMethod @email, 'SetEncryptCert', @success OUT, @cert

    EXEC sp_OAMethod @mailman, 'SendEmail', @success OUT, @email
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @mailman, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
      END
    ELSE
      BEGIN

        PRINT 'Encrypted Mail Sent!'
      END

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


END
GO