Rust

Apple Keychain - Create RSA Signature

See more Apple Keychain Examples

Using an RSA private key stored in the Apple Keychain, create a signature by signing the SHA-256 hash of the provided string, then return the signature encoded in Base64 format.

Note: This example requires Chilkat v10.0.0 or greater.

Rust

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

let cert = chilkat::Cert::new();

// On MacOS and iOS, the LoadByCommonName function will search the Apple Keychain for the matching certificate.

// A digital certificate's Common Name (CN) is a field in the certificate that specifies the name of the entity the 
// certificate is issued to. It is often used to identify the domain name, hostname, or organization the certificate represents. 

// For example:
// - In an SSL/TLS certificate for a website, the CN typically contains the domain name (e.g., "www.example.com").
// - For certificates representing individuals or organizations, the CN might include the person's name or the organization's name.

// The CN is part of the certificate's Subject field and is crucial for verifying that the certificate corresponds 
// to the intended entity, especially in SSL/TLS communications.

if cert.load_by_common_name("Example, Inc.").is_err() {
    println!("{}", cert.last_error_text());
    return;
}

let rsa = chilkat::Rsa::new();
if rsa.set_x509_cert(&cert, true).is_err() {
    println!("{}", rsa.last_error_text());
    return;
}

// Generate an RSA signature by signing the SHA-256 hash of the provided string, 
// then return the signature encoded in Base64 format.
rsa.set_encoding_mode("base64");
let Ok(sig_base64) = rsa.sign_string_enc("to be signed", "sha256") else {
    println!("{}", rsa.last_error_text());
    return;
};

println!("RSA Signature:");
println!("{}", sig_base64);