(C++) Decrypt Email using RSAES-OAEP with AES-128 CBC and SHA256

Demonstrates how to decrypt an email that was encrypted using RSAES-OAEP with SHA256 and AES-128 content encryption.

Note: This example requires Chilkat v9.5.0.67 or greater.

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#include <CkEmail.h>

void ChilkatSample(void)
    {
    CkEmail email;

    // To decrypt an email, we must provide the certificate + private key
    // that matches the cert + public key that was used to encrypt.
    // This can be done by adding PFX sources.
    // (On a Windows system, if the cert+private key was installed on the system,
    // then Chilkat should automatically find the matching cert+key and use it to decrypt.)

    bool success = email.AddPfxSourceFile("qa_data/rsaes-oaep/cert_plus_privatekey.pfx","PFX_PASSWORD");
    if (success != true) {
        std::cout << email.lastErrorText() << "\r\n";
        return;
    }

    // Email objects automatically decrypt when loaded from a file, or when loaded from MIME (which
    // includes when being downloaded from a mail server).
    success = email.LoadEml("qa_data/rsaes-oaep/rsaes-oaep-encrypted.eml");
    if (success != true) {
        std::cout << email.lastErrorText() << "\r\n";
        return;
    }

    // Note: It is not necessary to know in advance the algorithms needed to decrypt.
    // The information about the RSA algorithm (OAEP vs PKCS-v1_5), the OAEP hash algorithm,
    // and the content encryption algorithm (such as AES-128), are all contained within
    // the PKCS7 ASN.1 structures and any decryptor would read these to know what to do.

    // We can check to see if the email was actually encrypted, and if so, whether it
    // was successfully decrypted:
    if (email.get_ReceivedEncrypted() == true) {
        std::cout << "This email was encrypted." << "\r\n";
    }
    else {
        std::cout << "This email was not actually encrypted." << "\r\n";
        return;
    }

    // Now check to see if it was successfully decrypted.
    if (email.get_Decrypted() != true) {
        std::cout << "Unable to decrypt this email." << "\r\n";
        return;
    }

    // Save the decrypted .eml
    success = email.SaveEml("qa_output/decrypted.eml");

    // OK.. getting here means the email was decrypted.
    std::cout << "The email was successfully decrypted." << "\r\n";

    // The MIME of an encrypted email looks like this:

    // MIME-Version: 1.0
    // Date: Tue, 18 Apr 2017 10:12:16 -0500
    // Message-ID: <7ED75DF554717DC7994D7EB757E30709E8733C5C@CHILKAT13>
    // Content-Type: application/pkcs7-mime; name="smime.p7m"; smime-type="enveloped-data"
    // X-Priority: 3 (Normal)
    // Subject: This is a sample email
    // To: "Chilkat Support" <support@chilkatsoft.com>
    // From: "Chilkat GMail" <chilkat.support@gmail.com>
    // Content-Disposition: attachment; filename="smime.p7m"
    // Content-Transfer-Encoding: base64
    // 
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    }