Zig

Set the S/MIME Encryption Key Length

Demonstrates the Chilkat Email.Pkcs7KeyLength property, which sets the key length of the symmetric algorithm used for PKCS#7 (S/MIME) encryption. The allowed values depend on Pkcs7CryptAlg: for aes use 128, 192, or 256; for 3des use 192; for des use 40; for rc2 use 40, 56, 64, or 128. The default is 128, and an unsupported algorithm/key-length combination causes encryption to fail. This example pairs AES with a 192-bit key.

Background: Key length is the size, in bits, of the secret key a symmetric cipher uses — a longer key means exponentially more possible keys and thus more resistance to brute-force attack. But length is only meaningful within a given algorithm: AES-128 is already very strong, and a key size must be one the chosen cipher actually supports, which is why Pkcs7KeyLength and Pkcs7CryptAlg have to agree.

Chilkat Zig Downloads

Download Chilkat for Zig

Zig

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

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

    // Demonstrates the Email.Pkcs7KeyLength property, which sets the key length (in bits)
    // of the symmetric algorithm used for PKCS#7 (S/MIME) encryption.  The allowed values
    // depend on Pkcs7CryptAlg; for aes they are 128, 192, or 256.  The default is 128.

    const email = try chilkat.Email.init();
    defer email.deinit();

    email.setPkcs7CryptAlg("aes");
    email.setPkcs7KeyLength(192);

    std.debug.print("Pkcs7CryptAlg = {s}\n", .{try email.getPkcs7CryptAlg(alloc)});
    std.debug.print("Pkcs7KeyLength = {d}\n", .{email.getPkcs7KeyLength()});
}