Zig Requires Chilkat v11.0.0+

RSA Sign with PKCS8 Encrypted Key

See more RSA Examples

Demonstrates how to load a private key from an encrypted PKCS8 file and create an RSA digital 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 assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    const pkey = try chilkat.PrivateKey.init();
    defer pkey.deinit();

    // Load the private key from an RSA PEM file:
    try pkey.loadPkcs8EncryptedFile("privateKey.key", "myPassword");

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

    // Import the private key into the RSA object:
    rsa.usePrivateKey(pkey) catch {
        std.debug.print("{s}\n", .{try rsa.getLastErrorText(alloc)});
        return;
    };

    // Return the signature in hex
    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 "md2", "sha256", "sha384", "sha512",  and "md5".
    const hex_sig = try rsa.signStringENC(alloc, str_data, "sha-1");

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