(Unicode C++) Send aes-gcm authEnvelopedData Encrypted Email

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Note: This example requires Chilkat v10.0.0 or later

Demonstrates how to send encrypted email using 128-bit AES in GCM mode.

"AES-GCM" (Advanced Encryption Standard - Galois/Counter Mode) is a cryptographic algorithm that provides both encryption and integrity protection (authentication). When used in the context of email security with "authEnvelopedData", it often refers to a method of securely sending encrypted and authenticated email content.

Here’s a brief breakdown:

• AES-GCM: Combines symmetric encryption (AES) with authentication, ensuring both the confidentiality and integrity of the message. It generates an authentication tag to detect any unauthorized changes.
• authEnvelopedData: Refers to a type of structure used in secure email protocols (like S/MIME) to package encrypted content. It contains the encrypted data and associated encrypted session keys.
• Email Security: When applied to emails, AES-GCM ensures the email content is encrypted (confidential) and also tamper-resistant (authenticated), with the encryption keys typically shared securely using asymmetric encryption (e.g., public key infrastructure, or PKI).

In short, AES-GCM with "authEnvelopedData" provides a way to encrypt and authenticate emails, making them confidential and resistant to tampering.

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#include <CkMailManW.h>
#include <CkCertW.h>
#include <CkEmailW.h>

void ChilkatSample(void)
    {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // The mailman object is used for sending and receiving email.
    CkMailManW mailman;

    mailman.put_SmtpHost(L"smtp.example.com");

    mailman.put_SmtpUsername(L"my_smtp_login");
    mailman.put_SmtpPassword(L"my_smtp_password");

    // The typical SMTP ports are 465 for implicit SSL/TLS or 587 for explicit SSL/TLS
    mailman.put_SmtpPort(465);
    mailman.put_SmtpSsl(true);

    // Use the recipient's certificate for encryption.
    CkCertW cert;
    bool success = cert.LoadFromFile(L"c:/someDir/recipient_cert.cer");
    if (success != true) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    CkEmailW email;

    email.put_Subject(L"This email is encrypted");
    email.put_Body(L"This is AES-GCM encrypted mail");
    email.put_From(L"Mary <mary@example1.com>");
    success = email.AddTo(L"Joe",L"joe@example.com");

    // Specify that AES-GCM w/ authEnvelopedData is to be used. 
    // Also specify other params..
    email.put_Pkcs7CryptAlg(L"aes-gcm");
    email.put_Pkcs7KeyLength(128);
    email.put_OaepPadding(true);
    email.put_OaepHash(L"sha256");
    email.put_OaepMgfHash(L"sha256");

    // Indicate the email is to be sent encrypted.
    email.put_SendEncrypted(true);

    // Specify the certificate to be used for encryption.
    success = email.SetEncryptCert(cert);

    success = mailman.SendEmail(email);
    if (success != true) {
        wprintf(L"%s\n",mailman.lastErrorText());
    }
    else {
        wprintf(L"Mail Sent!\n");
    }
    }