Zig

FatturaPA XML Invoice Sign+Encrypt to P7M

See more Digital Signatures Examples

Demonstrates how to create a CAdES BES signed + encrypted invoice.xml.p7m for the Italian FatturaPA exchange system. Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

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

    const crypt = try chilkat.Crypt2.init();
    defer crypt.deinit();

    // Use a digital certificate and private key from a PFX file (.pfx or .p12).
    const pfx_path = "qa_data/pfx/cert_test123.pfx";
    const pfx_password = "test123";

    const cert = try chilkat.Cert.init();
    defer cert.deinit();
    cert.loadPfxFile(pfx_path, pfx_password) catch {
        std.debug.print("{s}\n", .{try cert.getLastErrorText(alloc)});
        return;
    };

    // Provide the signing cert (with associated private key).
    crypt.setSigningCert(cert) catch {
        std.debug.print("{s}\n", .{try crypt.getLastErrorText(alloc)});
        return;
    };

    // Indicate that SHA-256 should be used.
    crypt.setHashAlgorithm("sha256");

    // Specify the signed attributes to be included.
    // (This is what makes it CAdES-BES compliant.)
    const json_signed_attrs = try chilkat.JsonObject.init();
    defer json_signed_attrs.deinit();
    json_signed_attrs.updateInt("contentType", 1) catch {};
    json_signed_attrs.updateInt("signingTime", 1) catch {};
    json_signed_attrs.updateInt("messageDigest", 1) catch {};
    json_signed_attrs.updateInt("signingCertificateV2", 1) catch {};
    crypt.setSigningAttributes(try json_signed_attrs.emit(alloc));

    const in_file = "qa_data/xml/IT01234567890_11002.xml";
    const sig_file = "qa_data/fatturapa/signed.p7m";

    // Create the CAdES-BES signature, which contains the original data.
    crypt.createP7M(in_file, sig_file) catch {
        std.debug.print("{s}\n", .{try crypt.getLastErrorText(alloc)});
        return;
    };

    // Now we'll encrypt what was signed using FatturaPA's certificate (from a PEM file)
    const encrypt_cert = try chilkat.Cert.init();
    defer encrypt_cert.deinit();
    encrypt_cert.loadFromFile("qa_data/certs/fatturapa_cert.pem") catch {
        std.debug.print("{s}\n", .{try encrypt_cert.getLastErrorText(alloc)});
        return;
    };

    crypt.setCryptAlgorithm("pki");

    crypt.setEncryptCert(encrypt_cert) catch {
        std.debug.print("{s}\n", .{try crypt.getLastErrorText(alloc)});
        return;
    };

    // Indicate the underlying bulk encryption algorithm to be used:
    crypt.setPkcs7CryptAlg("aes");
    crypt.setKeyLength(128);

    // There's one last option that could be set.  If is the RSA encryption encryption/padding scheme.
    // By default, RSAES_PKCS1-V1_5 is used.  If desired, the OaepPadding property could be set to true to
    // use RSAES_OAEP.  (We'll leave it set at the default value of false)
    crypt.setOaepPadding(false);

    // Everything is specified.  Encrypt the .p7m to create a new .p7m (which adds a layer of encryption around the opaque signature).
    // The output is PKCS7 in binary DER format.
    crypt.ckEncryptFile(sig_file, "qa_output/signed_and_encrypted.p7m") catch {
        std.debug.print("{s}\n", .{try crypt.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("Success.\n", .{});
}