Rust

Send aes-gcm authEnvelopedData Encrypted Email

See more SMTP Examples

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.

Rust

// 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 = chilkat::MailMan::new();

mailman.set_smtp_host("smtp.example.com");

mailman.set_smtp_username("my_smtp_login");
mailman.set_smtp_password("my_smtp_password");

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

// Use the recipient's certificate for encryption.
let cert = chilkat::Cert::new();
if cert.load_from_file("c:/someDir/recipient_cert.cer").is_err() {
    println!("{}", cert.last_error_text());
    return;
}

let email = chilkat::Email::new();

email.set_subject("This email is encrypted");
email.set_body("This is AES-GCM encrypted mail");
email.set_from("Mary <mary@example1.com>");
let _ = email.add_to("Joe", "joe@example.com").is_ok();

// Specify that AES-GCM w/ authEnvelopedData is to be used. 
// Also specify other params..
email.set_pkcs7_crypt_alg("aes-gcm");
email.set_pkcs7_key_length(128);
email.set_oaep_padding(true);
email.set_oaep_hash("sha256");
email.set_oaep_mgf_hash("sha256");

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

// Specify the certificate to be used for encryption.
let _ = email.set_encrypt_cert(&cert).is_ok();

if mailman.send_email(&email).is_err() {
    println!("{}", mailman.last_error_text());
} else {
    println!("Mail Sent!");
}