Xbase++

Set the Decryption Certificate and Private Key

Demonstrates the Chilkat Email.SetDecryptCert2 method, which explicitly provides a certificate and its corresponding private key as separate objects for decrypting a received encrypted email. Set them before loading the encrypted message. This example loads a .cer certificate and a PEM private key, sets both, then loads an encrypted email.

Background: Sometimes the certificate and its private key are stored separately — a public .cer file plus a PEM (or other format) key file — rather than combined in a PFX. SetDecryptCert2 accepts the two objects individually, which is the natural fit for that arrangement. It is the two-object counterpart to SetDecryptCert, which takes a single certificate that already carries its private key.

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LOCAL nSuccess
LOCAL oEmail
LOCAL oCert
LOCAL oPrivKey

nSuccess := 0

//  Demonstrates the SetDecryptCert2 method, which explicitly provides a certificate and its
//  corresponding private key (as separate objects) for decrypting a received encrypted
//  email.  Set them before loading the encrypted email.

oEmail := CreateObject("Chilkat.Email")

//  Load the certificate (public) and the matching private key from separate files.
oCert := CreateObject("Chilkat.Cert")
nSuccess := oCert:LoadFromFile("qa_data/certs/recipient.cer")
IF (nSuccess == 0)
    ? oCert:LastErrorText
    oEmail:destroy()
    oCert:destroy()
    RETURN
ENDIF

oPrivKey := CreateObject("Chilkat.PrivateKey")
nSuccess := oPrivKey:LoadPemFile("qa_data/certs/recipient_privkey.pem")
IF (nSuccess == 0)
    ? oPrivKey:LastErrorText
    oEmail:destroy()
    oCert:destroy()
    oPrivKey:destroy()
    RETURN
ENDIF

//  Provide the certificate and private key to use for decryption.
nSuccess := oEmail:SetDecryptCert2(oCert, oPrivKey)
IF (nSuccess == 0)
    ? oEmail:LastErrorText
    oEmail:destroy()
    oCert:destroy()
    oPrivKey:destroy()
    RETURN
ENDIF

//  Load the encrypted email; Chilkat decrypts it using the certificate and key.
nSuccess := oEmail:LoadEml("qa_data/eml/encrypted.eml")
IF (nSuccess == 0)
    ? oEmail:LastErrorText
    oEmail:destroy()
    oCert:destroy()
    oPrivKey:destroy()
    RETURN
ENDIF

? "Decrypted = " + Str(oEmail:Decrypted)

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

oEmail:destroy()
oCert:destroy()
oPrivKey:destroy()