SQL Server

Set the Decryption Certificate for an Email

Demonstrates the Chilkat Email.SetDecryptCert method, which explicitly provides a certificate (with access to its private key) for decrypting a received encrypted email. Set the certificate before loading the encrypted message so Chilkat can decrypt it automatically. This example loads the certificate from a PFX, sets it, and then loads an encrypted email.

Background: Decrypting S/MIME email requires the recipient's private key. On Windows and macOS, Chilkat can find an installed certificate automatically, but when the key lives in a standalone PFX file you provide it explicitly with SetDecryptCert. A PFX (PKCS#12) bundles the certificate and its private key in one password-protected file. If the certificate and key are in separate files, use SetDecryptCert2 instead.

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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 SetDecryptCert method, which explicitly provides a certificate (with
    --  access to its private key) for decrypting a received encrypted email.  Set the cert
    --  before loading the encrypted email so it can be decrypted automatically.

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

    --  Load a certificate together with its private key from a PFX file.
    DECLARE @cert int
    EXEC @hr = sp_OACreate 'Chilkat.Cert', @cert OUT

    EXEC sp_OAMethod @cert, 'LoadPfxFile', @success OUT, 'qa_data/certs/decryption.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 certificate to use for decryption.
    EXEC sp_OAMethod @email, 'SetDecryptCert', @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

    --  Load the encrypted email; Chilkat decrypts it using the certificate.
    EXEC sp_OAMethod @email, 'LoadEml', @success OUT, 'qa_data/eml/encrypted.eml'
    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


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

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

    --  Note: Paths such as "qa_data/..." are relative local filesystem paths,
    --  relative to the current working directory of the running application.

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


END
GO