(C) 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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#include <C_CkEmail.h>

void ChilkatSample(void)
    {
    HCkEmail email;
    BOOL success;

    email = CkEmail_Create();

    //  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.)
    success = CkEmail_AddPfxSourceFile(email,"/pfxFiles/certs_and_keys_1.pfx","pfxPassword1");
    if (success != TRUE) {
        printf("%s\n",CkEmail_lastErrorText(email));
        CkEmail_Dispose(email);
        return;
    }

    success = CkEmail_AddPfxSourceFile(email,"/pfxFiles/certs_and_keys_2.pfx","pfxPassword2");
    if (success != TRUE) {
        printf("%s\n",CkEmail_lastErrorText(email));
        CkEmail_Dispose(email);
        return;
    }

    //  ...

    //  Load a potentially signed and/or encrypted email.
    success = CkEmail_LoadEml(email,"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 (CkEmail_getReceivedEncrypted(email) == TRUE) {

        printf("This email was encrypted.\n");
        if (CkEmail_getDecrypted(email) == TRUE) {
            printf("This email was successfully decrypted.  It was encrypted by:\n");
            printf("%s\n",CkEmail_encryptedBy(email));
        }
        else {
            printf("This email was not decrypted.\n");
        }

    }

    if (CkEmail_getReceivedSigned(email) == TRUE) {

        printf("This email was signed.\n");
        if (CkEmail_getSignaturesValid(email) == TRUE) {
            printf("The signature was verified.  It was signed by:\n");
            printf("%s\n",CkEmail_signedBy(email));
        }
        else {
            printf("The signature verification failed.\n");
        }

    }

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


    CkEmail_Dispose(email);

    }