Rust

Convert PDF to pdf.p7s (Digitally Signed)

See more CAdES Examples

Demonstrates how to convert a PDF into a .p7s file that contains the PDF within a PKCS7 signature (the .p7s format). Rust

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

// -----------------------------------------------------------------
// Note: This is case where the .p7s extension is used where the .p7m extension
// is technically more appropriate.
// See .p7s vs .p7m file extension
// -----------------------------------------------------------------

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

let cert = chilkat::Cert::new();
if cert.load_pfx_file("qa_data/pfx/cert_test123.pfx", "test123").is_err() {
    println!("{}", cert.last_error_text());
    return;
}

// Tell the crypt component to use this cert.
if crypt.set_signing_cert(&cert).is_err() {
    println!("{}", crypt.last_error_text());
    return;
}

// The CadesEnabled property applies to all methods that create PKCS7 signatures. 
// To create a CAdES-BES signature, set this property equal to true. 
crypt.set_cades_enabled(true);

crypt.set_hash_algorithm("sha256");

// We can sign any type of file, creating a .p7s as output.
// The .p7s contains the signature and also embeds the data of the file that is signed.
let in_file = "qa_data/pdf/sample.pdf".to_string();
let p7s_file = "qa_output/sample.pdf.p7s".to_string();

// -----------------------------------------------------------------------------------------
// Also see Chilkat's online tool to examine a .p7m and generate code to duplicate the .p7m
// -----------------------------------------------------------------------------------------

// Create the CAdES-BES attached signature, which contains the original data.
// Note: Chilkat's function naming is not accurate.  CreateP7M creates a PKCS7 signature where the signed file
// is contained within the signature.  CreateP7S creates a detached PKCS7 signature where the signed file
// is NOT contained within the signature.  We want the data to be contained in the signature, therefore
// we call CreateP7M even though we are naming our output file .p7s.
if crypt.create_p7_m(&in_file, &p7s_file).is_err() {
    println!("{}", crypt.last_error_text());
    return;
}

// Verify the .p7s file and extract the original file from the .p7s. 
let extracted_to_file_path = "qa_output/sample.pdf".to_string();
if crypt.verify_p7_m(&p7s_file, &extracted_to_file_path).is_err() {
    println!("{}", crypt.last_error_text());
    return;
}

println!("Success!");