Zig Requires Chilkat v11.0.0+

RSA Signature with Certificate's Private Key from PFX

See more RSA Examples

Demonstrates how to use a certificate's private key from a PFX file to create an RSA signature. Zig

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

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

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

    // Create an instance of a certificate store object, load a PFX file,
    // locate the certificate we need, and use it for signing.
    // (a PFX file may contain more than one certificate.)
    const cert_store = try chilkat.CertStore.init();
    defer cert_store.deinit();

    // The 1st argument is the filename, the 2nd arg is the
    // PFX file's password:
    cert_store.loadPfxFile("chilkat.pfx", "test") catch {
        std.debug.print("{s}\n", .{try cert_store.getLastErrorText(alloc)});
        return;
    };

    // Find the certificate by the subject common name:
    const json_cn = try chilkat.JsonObject.init();
    defer json_cn.deinit();
    json_cn.updateString("CN", "cert common name") catch {};

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

    const priv_key = try chilkat.PrivateKey.init();
    defer priv_key.deinit();
    cert.getPrivateKey(priv_key) catch {
        std.debug.print("{s}\n", .{try cert.getLastErrorText(alloc)});
        return;
    };

    const rsa = try chilkat.Rsa.init();
    defer rsa.deinit();

    rsa.usePrivateKey(priv_key) catch {
        std.debug.print("{s}\n", .{try rsa.getLastErrorText(alloc)});
        return;
    };

    // Encode the signature as a hex string
    rsa.setEncodingMode("hex");

    const str_data = "This is the string to be signed.";

    // Sign the string using the sha-1 hash algorithm.
    // Other valid choices are "sha-256", "md2" and "md5".
    const hex_sig = try rsa.signStringENC(alloc, str_data, "sha-1");

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

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