Rust Requires Chilkat v11.0.0+

RSA Encrypt String to Encoded Result and Reverse

See more RSA Examples

Demonstrates how to RSA encrypt a string to a base64 encoded result, and the reverse. Rust

let mut success = false;

// The RSA public key is used for encryption, and the private key for decryption.

// The public key's role is to make encryption accessible to anyone while ensuring that
// only the private key holder can decrypt the messages.
// The public key is designed to be widely distributed so anyone can use it to encrypt messages
// intended for the owner of the private key.

// Load our 2048-bit RSA public key.
let pub_key = chilkat::PublicKey::new();
// In all Chilkat methods expecting a path, you pass either absolute or relative paths.
success = pub_key.load_from_file("rsaKeys/myTestRsaPublic.pem").is_ok();
if !success {
    println!("{}", pub_key.last_error_text());
    return;
}

let rsa = chilkat::Rsa::new();

// Tell RSA to use the public key.
let _ = rsa.use_public_key(&pub_key);

// RSA encryption is for small amounts of data, on the order of 200 bytes or less.
// The maximum number of bytes that can be RSA encrypted depends
// on the RSA key size and padding scheme (OAEP padding vs PKCS#1 v1.5 padding).
// For specific limits, see: RSA Encryption Maximum Number of Bytes

// Encrypt the utf-8 byte representation of the string.
rsa.set_charset("utf-8");
rsa.set_encoding_mode("base64");

// Be Careful when Using non-us-ascii String Literals in Source Code
let encrypted_b64 = rsa.encrypt_string_enc("Élève français dîne à côté d’un café où l’on sert déjà du gâteau au chocolat et des éclairs délicieux", false).unwrap_or_default();

// ------------------------------------------------------------------------------------------------------------------------
// Let's decrypt, which requires the matching private key...

// Load the matching 2048-bit RSA private key.
let priv_key = chilkat::PrivateKey::new();
let password = "secret".to_string();
success = priv_key.load_any_format_file("rsaKeys/myTestRsaPrivate.pem", &password).is_ok();
if !success {
    println!("{}", priv_key.last_error_text());
    return;
}

// Tell the RSA object to use the private key.
let _ = rsa.use_private_key(&priv_key);

// Indicate that after decrypting the resultant decrypted bytes contains the utf-8 byte representation of the text.
rsa.set_charset("utf-8");
rsa.set_encoding_mode("base64");
let original_text = rsa.decrypt_string_enc(&encrypted_b64, true).unwrap_or_default();
if !success {
    println!("{}", rsa.last_error_text());
    return;
}

println!("Original text = {}", original_text);
println!("Success.");