Rust

Encrypt a File to a PKCS7 (CMS) Message

Shows how to encrypt a file into a PKCS7 encrypted message using the recipient's certificate. Public-key encryption requires no private key. However, the recipient's private key is necessary for decryption. Rust

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

let crypt = chilkat::Crypt2::new();

// Load the recipient's digital certificate. 
// We don't need the private key for encryption.
// Only the public key is needed (which is included in a certificate).
let cert1 = chilkat::Cert::new();
let _ = cert1.load_from_file("qa_data/user1/cert_user1.pem").is_ok();
// Assume success for the example, but make sure your application checks for success/failure...
let _ = crypt.set_encrypt_cert(&cert1);

// Indicate that we want PKI encryption (i.e. public-key infrastructure)
// to produce a CMS message (Cryptographic Message Syntax/PKCS7),
// that is be created with RSAES-OAEP padding, SHA256, and AES-256 for the
// bulk encryption.
crypt.set_crypt_algorithm("pki");
crypt.set_pkcs7_crypt_alg("aes");
crypt.set_key_length(256);
crypt.set_oaep_hash("sha256");
crypt.set_oaep_padding(true);

// Load the file to be encrypted...
let file_data = chilkat::BinData::new();
let _ = file_data.load_file("qa_data/jpg/penguins.jpg").is_ok();
// Your app should check for success/failure..

// Encrypt the data.  The contents of the fileData object are replaced with the PKCS7 encrypted message.
if crypt.encrypt_bd(&file_data).is_err() {
    println!("{}", crypt.last_error_text());
    return;
}

// Save the PKCS7 encrypted message to a file..
let _ = file_data.write_file("qa_output/pkcs7_encrypted.p7").is_ok();

println!("OK.");