Zig Requires Chilkat v11.0.0+

RSA Encrypt and Decrypt Strings

See more RSA Examples

_LANGUAGE_ sample code to RSA public-key encrypt and decrypt strings using public and private keys. 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 rsa = try chilkat.Rsa.init();
    defer rsa.deinit();

    // This example also generates the public and private
    // keys to be used in the RSA encryption.
    // Normally, you would generate a key pair once,
    // and distribute the public key to your partner.
    // Anything encrypted with the public key can be
    // decrypted with the private key.  The reverse is
    // also true: anything encrypted using the private
    // key can be decrypted using the public key.

    // Generate a 2048-bit key.  Chilkat RSA supports
    // key sizes ranging from 512 bits to 4096 bits.
    const priv_key = try chilkat.PrivateKey.init();
    defer priv_key.deinit();
    rsa.genKey(2048, priv_key) catch {
        std.debug.print("{s}\n", .{try rsa.getLastErrorText(alloc)});
        return;
    };

    const pub_key = try chilkat.PublicKey.init();
    defer pub_key.deinit();
    priv_key.toPublicKey(pub_key) catch {};

    const plain_text = "Encrypting and decrypting should be easy!";

    // Start with a new RSA object to demonstrate that all we
    // need are the keys previously exported:
    const rsa_encryptor = try chilkat.Rsa.init();
    defer rsa_encryptor.deinit();

    // Encrypted output is always binary.  In this case, we want
    // to encode the encrypted bytes in a printable string.
    // Our choices are "hex", "base64", "url", "quoted-printable".
    rsa_encryptor.setEncodingMode("hex");

    // We'll encrypt with the public key and decrypt with the private
    // key.
    try rsa_encryptor.usePublicKey(pub_key);

    var use_private_key: bool = false;
    const encrypted_str = try rsa_encryptor.encryptStringENC(alloc, plain_text, use_private_key);
    std.debug.print("{s}\n", .{encrypted_str});

    // Now decrypt:
    const rsa_decryptor = try chilkat.Rsa.init();
    defer rsa_decryptor.deinit();

    rsa_decryptor.setEncodingMode("hex");
    try rsa_decryptor.usePrivateKey(priv_key);

    use_private_key = true;
    const decrypted_str = try rsa_decryptor.decryptStringENC(alloc, encrypted_str, use_private_key);

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