Rust Requires Chilkat v11.0.0+

Duplicate OpensSSL to Sign File and Output Binary DER

See more OpenSSL Examples

This example duplicates the following:

openssl smime -sign -in INPUT.xml -signer SIGN.PEM -passin pass:MYPASS -outform der -binary -nodetach -out SIGNED.P7M

Note: Although "smime" is the OpenSSL command, it's not actually producing S/MIME. The arguments "-outform der -binary" indicates that the output is binary DER (i.e. the PKCS7 binary signature). The input can be any type of file: XML, PDF, JPG, ... *anything*...

Rust

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

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

// Load the PEM containing cert + private key.
let pem = chilkat::Pem::new();
if pem.load_pem_file("qa_data/pem/myPem.pem", "password").is_err() {
    println!("{}", pem.last_error_text());
    return;
}

let privkey = chilkat::PrivateKey::new();
if pem.private_key_at(0, &privkey).is_err() {
    println!("{}", pem.last_error_text());
    return;
}

let cert = chilkat::Cert::new();
if pem.cert_at(0, &cert).is_err() {
    println!("{}", pem.last_error_text());
    return;
}

if crypt.set_signing_cert2(&cert, &privkey).is_err() {
    println!("{}", crypt.last_error_text());
    return;
}

// Alternatively, we could use a .pfx/.p12 file.
// (Chilkat also supports other formats/sources for cert/private keys...)
let cert_from_p12 = chilkat::Cert::new();
if cert_from_p12.load_pfx_file("qa_data/p12/myP12.p12", "password").is_err() {
    println!("{}", cert_from_p12.last_error_text());
    return;
}

// The certificate, when loaded from a .pfx/.p12, will automatically 
// include the associated private key, assuming it's present in the .p12.
// We don't have to explicitly provide the private key as in the
// lines of code above that use the PEM file.
if crypt.set_signing_cert(&cert_from_p12).is_err() {
    println!("{}", crypt.last_error_text());
    return;
}

// Create the opaque signature (PKCS7 binary DER that contains both the signature and original file data).
if crypt.create_p7_m("qa_data/infile.anything", "qa_output/outfile.p7m").is_err() {
    println!("{}", crypt.last_error_text());
    return;
}

println!("Success.");