(SQL Server) Send Encrypted Email with a Selected Algorithm (AES, 3DES, etc.)

Sends an encrypted email using the recipient's digital certificate from a .cer file, and chooses 3DES for the encryption algorithm. (It is also possible to send AES encrypted email w/ 128-bit, 192-bit, or 256-bit encryption simply by setting the Pkcs7CryptAlg and Pkcs7KeyLength properties.)

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 mailman object is used for sending and receiving email.
    DECLARE @mailman int
    -- Use "Chilkat_9_5_0.MailMan" for versions of Chilkat < 10.0.0
    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.mymailserver.com'

    -- Load the .cer file into a certificate object.
    -- When sending S/MIME encrypted email, it is the recipient's
    -- certificate that is used for encryption.  Only the public key
    -- is needed to encrypt.  The recipient is the only
    -- one possessing the private key, and therefore is the only
    -- one able to decrypt.
    DECLARE @cert int
    -- Use "Chilkat_9_5_0.Cert" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Cert', @cert OUT

    DECLARE @success int
    EXEC sp_OAMethod @cert, 'LoadFromFile', @success OUT, 'cknotes.cer'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @cert, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @mailman
        EXEC @hr = sp_OADestroy @cert
        RETURN
      END

    -- Create a new email object
    DECLARE @email int
    -- Use "Chilkat_9_5_0.Email" for versions of Chilkat < 10.0.0
    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', 'Chilkat Support <support@chilkatsoft.com>'
    EXEC sp_OAMethod @email, 'AddTo', @success OUT, 'Chilkat Blog', 'admin@cknotes.com'

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

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

    -- If desired, specify the encryption algorithm to be used.
    -- The Pkcs7CryptAlg property can be set to "aes", "des", "3des", or "rc2"
    EXEC sp_OASetProperty @email, 'Pkcs7CryptAlg', '3des'

    -- If desired, set the key length (in bits) for the encryption algorithm:
    -- The possible values allowed depend on the Pkcs7CryptAlg property. 
    -- For "aes", the key length may be 128, 192, or 256. 
    -- For "3des" the key length must be 192. 
    -- For "des" the key length must be 40. 
    -- For "rc2" the key length can be 40, 56, 64, or 128.
    EXEC sp_OASetProperty @email, 'Pkcs7KeyLength', 192

    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 'Mail Sent!'
      END

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


END
GO