Rust

RSAES-OAEP Encrypt String with AES-128 Content Encryption and SHA256

See more Encryption Examples

Encrypts a string using RSAES-OAEP with SHA256 and AES-128 content encryption to produce PKCS7 output (base64 encoded).

Note: This example requires Chilkat v9.5.0.67 or greater.

Rust

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

// First build a string to be encrypted
let sb = chilkat::StringBuilder::new();
let mut i = 1;
while i < 25 {
    let _ = sb.append_int(i);
    let _ = sb.append(" the quick brown fox jumped over the lazy dog.\r\n");
    i = i + 1;
}

println!("{}", sb.get_as_string().unwrap_or_default());

// The string to be encrypted looks like this:

// 1 the quick brown fox jumped over the lazy dog.
// 2 the quick brown fox jumped over the lazy dog.
// 3 the quick brown fox jumped over the lazy dog.
// 4 the quick brown fox jumped over the lazy dog.
// 5 the quick brown fox jumped over the lazy dog.
// 6 the quick brown fox jumped over the lazy dog.
// ...

// 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 cert = chilkat::Cert::new();
if cert.load_from_file("qa_data/rsaes-oaep/cert.pem").is_err() {
    println!("{}", cert.last_error_text());
    return;
}

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

// Tell the crypt object to use the certificate.
let _ = crypt.set_encrypt_cert(&cert);

// 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);

// Also, don't forget to be specific about the character encoding (byte representation) of the
// string to be encrypted.
crypt.set_charset("utf-8");

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

let Ok(base64_pkcs7) = crypt.encrypt_string_enc(&sb.get_as_string().unwrap_or_default()) else {
    println!("{}", crypt.last_error_text());
    return;
};

// Show the output
println!("{}", base64_pkcs7);

// This base64 can be copy-and-pasted into the form at http://lapo.it/asn1js/
// to verify that all the chosen algorithms were indeed used.

println!("OK.");