(Swift 3,4,5...) 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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func chilkatTest() {
    // 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.
    let mailman = CkoMailMan()!

    mailman.smtpHost = "smtp.example.com"

    mailman.smtpUsername = "my_smtp_login"
    mailman.smtpPassword = "my_smtp_password"

    // The typical SMTP ports are 465 for implicit SSL/TLS or 587 for explicit SSL/TLS
    mailman.smtpPort = 465
    mailman.smtpSsl = true

    // Use the recipient's certificate for encryption.
    let cert = CkoCert()!
    var success: Bool = cert.load(fromFile: "c:/someDir/recipient_cert.cer")
    if success != true {
        print("\(cert.lastErrorText!)")
        return
    }

    let email = CkoEmail()!

    email.subject = "This email is encrypted"
    email.body = "This is AES-GCM encrypted mail"
    email.from = "Mary <mary@example1.com>"
    success = email.add(to: "Joe", emailAddress: "joe@example.com")

    // Specify that AES-GCM w/ authEnvelopedData is to be used. 
    // Also specify other params..
    email.pkcs7CryptAlg = "aes-gcm"
    email.pkcs7KeyLength = 128
    email.oaepPadding = true
    email.oaepHash = "sha256"
    email.oaepMgfHash = "sha256"

    // Indicate the email is to be sent encrypted.
    email.sendEncrypted = true

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

    success = mailman.send(email)
    if success != true {
        print("\(mailman.lastErrorText!)")
    }
    else {
        print("Mail Sent!")
    }


}