Rust Requires Chilkat v11.0.0+

Duplicate openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -A

See more RSA Examples

Demonstrates how to duplicate the creation of an RSA signature produced by this OpenSSL command:

openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -A

Rust

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

let pkey = chilkat::PrivateKey::new();

// Load the private key from an RSA PEM file:
let _ = pkey.load_pem_file("myKey.pem").is_ok();

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

// Import the private key into the RSA component:
if rsa.use_private_key(&pkey).is_err() {
    println!("{}", rsa.last_error_text());
    return;
}

// OpenSSL uses BigEndian byte ordering:
rsa.set_little_endian(false);

// The resulting signature will be a Base64 string:
rsa.set_encoding_mode("base64");

// For simplicity, we're not loading
// the data to be signed from a file.  We are instead simply
// using a literal string value.  
let str_data = "This is the text to be signed.".to_string();

// Hash the input using MD5, and then sign the hash:
// Other valid hash algorithm choices are "md2" and "sha-1".
let base64_sig = rsa.sign_string_enc(&str_data, "md5").unwrap_or_default();

println!("{}", base64_sig);

println!("Success!");