(Go) Send aes-gcm authEnvelopedData Encrypted Email

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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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    // 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.
    mailman := chilkat.NewMailMan()

    mailman.SetSmtpHost("smtp.example.com")

    mailman.SetSmtpUsername("my_smtp_login")
    mailman.SetSmtpPassword("my_smtp_password")

    // The typical SMTP ports are 465 for implicit SSL/TLS or 587 for explicit SSL/TLS
    mailman.SetSmtpPort(465)
    mailman.SetSmtpSsl(true)

    // Use the recipient's certificate for encryption.
    cert := chilkat.NewCert()
    success := cert.LoadFromFile("c:/someDir/recipient_cert.cer")
    if success != true {
        fmt.Println(cert.LastErrorText())
        mailman.DisposeMailMan()
        cert.DisposeCert()
        return
    }

    email := chilkat.NewEmail()

    email.SetSubject("This email is encrypted")
    email.SetBody("This is AES-GCM encrypted mail")
    email.SetFrom("Mary <mary@example1.com>")
    success = email.AddTo("Joe","joe@example.com")

    // Specify that AES-GCM w/ authEnvelopedData is to be used. 
    // Also specify other params..
    email.SetPkcs7CryptAlg("aes-gcm")
    email.SetPkcs7KeyLength(128)
    email.SetOaepPadding(true)
    email.SetOaepHash("sha256")
    email.SetOaepMgfHash("sha256")

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

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

    success = mailman.SendEmail(email)
    if success != true {
        fmt.Println(mailman.LastErrorText())
    } else {
        fmt.Println("Mail Sent!")
    }


    mailman.DisposeMailMan()
    cert.DisposeCert()
    email.DisposeEmail()