Visual FoxPro

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 lnSuccess
LOCAL loEmail
LOCAL loCert
LOCAL loPrivKey

lnSuccess = 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.

loEmail = CreateObject('Chilkat.Email')

*  Load the certificate (public) and the matching private key from separate files.
loCert = CreateObject('Chilkat.Cert')
lnSuccess = loCert.LoadFromFile("qa_data/certs/recipient.cer")
IF (lnSuccess = 0) THEN
    ? loCert.LastErrorText
    RELEASE loEmail
    RELEASE loCert
    CANCEL
ENDIF

loPrivKey = CreateObject('Chilkat.PrivateKey')
lnSuccess = loPrivKey.LoadPemFile("qa_data/certs/recipient_privkey.pem")
IF (lnSuccess = 0) THEN
    ? loPrivKey.LastErrorText
    RELEASE loEmail
    RELEASE loCert
    RELEASE loPrivKey
    CANCEL
ENDIF

*  Provide the certificate and private key to use for decryption.
lnSuccess = loEmail.SetDecryptCert2(loCert,loPrivKey)
IF (lnSuccess = 0) THEN
    ? loEmail.LastErrorText
    RELEASE loEmail
    RELEASE loCert
    RELEASE loPrivKey
    CANCEL
ENDIF

*  Load the encrypted email; Chilkat decrypts it using the certificate and key.
lnSuccess = loEmail.LoadEml("qa_data/eml/encrypted.eml")
IF (lnSuccess = 0) THEN
    ? loEmail.LastErrorText
    RELEASE loEmail
    RELEASE loCert
    RELEASE loPrivKey
    CANCEL
ENDIF

? "Decrypted = " + STR(loEmail.Decrypted)

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

RELEASE loEmail
RELEASE loCert
RELEASE loPrivKey