Zig

Select the S/MIME Encryption Algorithm

Demonstrates the Chilkat Email.Pkcs7CryptAlg property, which selects the underlying symmetric encryption algorithm used when an email is sent encrypted with PKCS#7 public-key (S/MIME) encryption. Possible values are aes, aes-gcm, des, 3des, and rc2; the default is aes. This example selects AES and pairs it with a 256-bit key length.

Background: S/MIME encryption is hybrid. The message body is encrypted with a fast symmetric algorithm (the one this property chooses, such as AES) using a randomly generated one-time key; then that one-time key is itself encrypted with each recipient's public key. This gives the speed of symmetric encryption with the key-distribution convenience of public-key cryptography. Modern choices like aes are strongly preferred — older options such as des and rc2 are considered weak.

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

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

    // Demonstrates the Email.Pkcs7CryptAlg property, which selects the symmetric encryption
    // algorithm used when an email is sent encrypted with PKCS#7 (S/MIME) public-key
    // encryption.  Possible values: aes, aes-gcm, des, 3des, rc2.  The default is aes.

    const email = try chilkat.Email.init();
    defer email.deinit();
    email.setSubject("Encrypted email");
    email.setBody("This message will be S/MIME encrypted when sent.");

    // Select AES with a 256-bit key for the symmetric encryption.
    email.setPkcs7CryptAlg("aes");
    email.setPkcs7KeyLength(256);

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