Zig

Add Private Key to Java Keystore

See more Java KeyStore (JKS) Examples

Adds a private key to an existing Java keystore. 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 jks = try chilkat.JavaKeyStore.init();
    defer jks.deinit();

    const jks_password = "myJksPassword";
    const jks_path = "/someDir/keyStore.jks";

    // Load the Java keystore from a file.
    jks.loadFile(jks_password, jks_path) catch {
        std.debug.print("{s}\n", .{try jks.getLastErrorText(alloc)});
        return;
    };

    // A JKS private key entry consists of both the private key,
    // it's associated certificate (which contains the matching public key
    // within the X.509 of the certificate), and the certificates in the
    // chain of authentication to the root.
    //
    // Therefore, to add a private key entry to a JKS requires
    // a Chilkat certificate object that has a private key and which also
    // has the certificate chain (up to the root) available.

    // There are many ways to get a Chilkat certificate object
    // that contains (within it) the private key and the certificate chain
    // This example will show two possibilities:
    // (1) Where the cert and issuing root are provided in PEM format in .crt files,
    // and the private key is also provided in unencrypted PEM format (.key file).
    // (2) Where the cert, private key, and issuing root are provided in a single PFX.

    // First for the .crt / .key files:
    const cert = try chilkat.Cert.init();
    defer cert.deinit();

    // Chilkat will automatically determine the format of the cert file and load it correctly.
    cert.loadFromFile("/mycerts/alice.crt") catch {
        std.debug.print("{s}\n", .{try cert.getLastErrorText(alloc)});
        return;
    };

    // Certificates required for building the chain of authentication can be
    // added to an XML certificate vault object, and then provided as
    // a source for obtaining certs when building the chain.
    const cert_vault = try chilkat.XmlCertVault.init();
    defer cert_vault.deinit();
    cert_vault.addCertFile("/mycerts/ca.crt") catch {
        std.debug.print("{s}\n", .{try cert_vault.getLastErrorText(alloc)});
        return;
    };

    cert.useCertVault(cert_vault) catch {
        std.debug.print("{s}\n", .{try cert.getLastErrorText(alloc)});
        return;
    };

    // Now provide the associated private key to the certificate object.
    // The Chilkat private key class provides methods for loading from many formats (both
    // encrypted and unencrypted).
    const priv_key = try chilkat.PrivateKey.init();
    defer priv_key.deinit();
    priv_key.loadPemFile("/mycerts/alice.key") catch {
        std.debug.print("{s}\n", .{try priv_key.getLastErrorText(alloc)});
        return;
    };

    // Provide the certificate object with the private key:
    cert.setPrivateKey(priv_key) catch {
        std.debug.print("{s}\n", .{try cert.getLastErrorText(alloc)});
        return;
    };

    // Our certificate object now contains all that we need to add it as a private key entry
    // to the Java keystore:
    var alias: [:0]const u8 = "alice";
    jks.addPrivateKey(cert, alias, jks_password) catch {
        std.debug.print("{s}\n", .{try jks.getLastErrorText(alloc)});
        return;
    };

    // Write the updated JKS, which contains the new private key entry w/ certificate chain.
    jks.toFile(jks_password, jks_path) catch {
        std.debug.print("{s}\n", .{try jks.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("Added new private key entry (from .crt and .key files) to the JKS!\n", .{});

    // Now let's add a new private key entry from a PFX that contains a single
    // private key with associated cert and cert chain.
    const pfx = try chilkat.Pfx.init();
    defer pfx.deinit();

    pfx.loadPfxFile("/myPfxFiles/my.pfx", "pfxPassword") catch {
        std.debug.print("{s}\n", .{try pfx.getLastErrorText(alloc)});
        return;
    };

    // This is easy -- simply add the PFX to the JKS
    alias = "bob";
    jks.addPfx(pfx, alias, jks_password) catch {
        std.debug.print("{s}\n", .{try jks.getLastErrorText(alloc)});
        return;
    };

    // Write the updated JKS, which contains the new private key entry w/ certificate chain
    // that came from the PFX.
    jks.toFile(jks_password, jks_path) catch {
        std.debug.print("{s}\n", .{try jks.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("Added new private key entry (from PFX) to the JKS!\n", .{});
}