SQL Server

Send an Email with a Digital Signature

Demonstrates the Chilkat Email.SendSigned property. Set it to true to have the email sent with a digital signature (the default is false). Signing also requires a certificate with access to its private key. This example loads that certificate (and its private key) from a PFX file with Cert.LoadPfxFile, supplies it via SetSigningCert, and enables signed sending.

Background: Signing is the mirror image of encrypting. To encrypt for a recipient you use their public certificate; to sign you use your own private key, and recipients verify with your public certificate. A signature does not hide the message — a signed email is still readable by anyone — but it proves who sent it and guarantees the content was not tampered with. A PFX (also called PKCS#12, .pfx or .p12) is a password-protected file that bundles a certificate together with its private key, making it a convenient single-file source for signing credentials.

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--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

    --  Demonstrates the Email.SendSigned property with a full signing setup.  Set SendSigned
    --  to true to have the email sent with a digital signature.  Signing requires a certificate
    --  with access to its private key, which we load here from a PFX (.pfx / .p12) file.

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

    EXEC sp_OASetProperty @email, 'Subject', 'Signed email'
    EXEC sp_OASetProperty @email, 'Body', 'This message will be sent with a digital signature.'
    EXEC sp_OASetProperty @email, 'From', 'alice@example.com'
    EXEC sp_OAMethod @email, 'AddTo', @success OUT, 'Bob', 'bob@example.com'

    --  Load the signing certificate (including its private key) from a PFX file.
    --  The 2nd argument is the PFX password.
    DECLARE @cert int
    EXEC @hr = sp_OACreate 'Chilkat.Cert', @cert OUT

    EXEC sp_OAMethod @cert, 'LoadPfxFile', @success OUT, 'qa_data/certs/signer.pfx', 'pfx_password'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @cert, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @email
        EXEC @hr = sp_OADestroy @cert
        RETURN
      END

    --  Provide the signing certificate.
    EXEC sp_OAMethod @email, 'SetSigningCert', @success OUT, @cert
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @email, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @email
        EXEC @hr = sp_OADestroy @cert
        RETURN
      END

    --  Request that the email be sent with a digital signature.
    EXEC sp_OASetProperty @email, 'SendSigned', 1


    EXEC sp_OAGetProperty @email, 'SendSigned', @iTmp0 OUT
    PRINT 'SendSigned = ' + @iTmp0

    --  Note: The path "qa_data/certs/signer.pfx" is a relative local filesystem path,
    --  relative to the current working directory of the running application.

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


END
GO