Rust

Encrypt a file to a PKCS7 encrypted message using multiple certificates from different users

See more Encryption Examples

Demonstrates how to encrypt a file to a PKCS7 encrypted message using multiple certificates from different users. Any one of the users can decrypt using his/her own certificate + private key.

Note: When doing public key encryption, it is the public key that is used to encrypt. The private key is required 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();

// Tell the crypt object to use 3 certificates.
// Do this by calling AddEncryptCert for each certificate.

// Load a 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...
crypt.add_encrypt_cert(&cert1);

let cert2 = chilkat::Cert::new();
let _ = cert2.load_from_file("qa_data/user2/cert_user2.pem").is_ok();
crypt.add_encrypt_cert(&cert2);

let cert3 = chilkat::Cert::new();
let _ = cert3.load_from_file("qa_data/user3/cert_user3.pem").is_ok();
crypt.add_encrypt_cert(&cert3);

// 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-128 for the
// bulk encryption.
crypt.set_crypt_algorithm("pki");
crypt.set_pkcs7_crypt_alg("aes");
crypt.set_key_length(128);
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();

// Now indicate that the PKCS7 output is to be returned in the base64 encoding.
crypt.set_encoding_mode("base64");

println!("OK.");