(Lianja) Load Signed and/or Encrypted Email and Unwrap Security Layers

The LoadEml method loads an email (.eml file containing the MIME of an email) and automatically unwraps the digital signature and encryption security layers. A program can then examine the properties of the email object to see what was unwrapped.

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loEmail = createobject("CkEmail")

//  Provide PFX/.p12 files for any certs+keys needed for decryption.
//  Signature verification does not need anything extra.
//  (Also, Chilkat will automatically find and use pre-installed certs + private keys needed for decryption
//  on a Windows system.)
llSuccess = loEmail.AddPfxSourceFile("/pfxFiles/certs_and_keys_1.pfx","pfxPassword1")
if (llSuccess <> .T.) then
    ? loEmail.LastErrorText
    release loEmail
    return
endif

llSuccess = loEmail.AddPfxSourceFile("/pfxFiles/certs_and_keys_2.pfx","pfxPassword2")
if (llSuccess <> .T.) then
    ? loEmail.LastErrorText
    release loEmail
    return
endif

//  ...

//  Load a potentially signed and/or encrypted email.
llSuccess = loEmail.LoadEml("someDir/someEmail.eml")

//  If the email was signed and/or encrypted, it was "unwrapped", i.e.
//  the email is already decrypted and in a state as if it were never signed or encrypted.

//  You may check to see if the email was received encrypted or signed, and if so,
//  whether it was successfully unwrapped and who signed or encrypted it:
if (loEmail.ReceivedEncrypted = .T.) then

    ? "This email was encrypted."
    if (loEmail.Decrypted = .T.) then
        ? "This email was successfully decrypted.  It was encrypted by:"
        ? loEmail.EncryptedBy
    else
        ? "This email was not decrypted."
    endif

endif

if (loEmail.ReceivedSigned = .T.) then

    ? "This email was signed."
    if (loEmail.SignaturesValid = .T.) then
        ? "The signature was verified.  It was signed by:"
        ? loEmail.SignedBy
    else
        ? "The signature verification failed."
    endif

endif

//  At this point, the contents of the email, including attachments, can be accessed normally..


release loEmail