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AES-CMAC

See more Encryption Examples

Demonstrates using the AES-CMAC algorithm, which is a keyed hash function similar to HMAC and Poly1305.

Note: Chilkat added AES-CMAC in version 9.5.0.95.

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 crypt = try chilkat.Crypt2.init();
    defer crypt.deinit();

    // Set the MAC algorithm to AES-CMAC
    crypt.setMacAlgorithm("aes-cmac");

    // AES-CMAC always uses a 16-byte (128-bit) MAC key.
    const key_hex = "2b7e151628aed2a6abf7158809cf4f3c";
    try crypt.setMacKeyEncoded(key_hex, "hex");

    // Let's compute the AES-CMAC for the test vector at https://www.rfc-editor.org/rfc/rfc4493#appendix-A
    // Here we have 64 bytes in hex representation.
    const message_bytes = "6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e5130c81c46a35ce411e5fbc1191a0a52eff69f2445df4f9b17ad2b417be66c3710";

    const bd = try chilkat.BinData.init();
    defer bd.deinit();
    bd.appendEncoded(message_bytes, "hex") catch {};

    // Compute the AES-CMAC for the bytes contained in bd and return the AES-CMAC in hex representation.
    crypt.setEncodingMode("hex_lower");
    const cmac = try crypt.macBdENC(alloc, bd);
    std.debug.print("{s}\n", .{cmac});
    // Output should be: 51f0bebf7e3b9d92fc49741779363cfe

    // Now do the same for a string:
    const plain_text = "'Twas brillig, and the slithy toves\nDid gyre and gimble in the wabe:\nAll mimsy were the borogoves,\nAnd the mome raths outgrabe.";
    const enc_tag = try crypt.macStringENC(alloc, plain_text);
    std.debug.print("{s}\n", .{enc_tag});

    // Output should be: 4fca1fcbd265048d247f99ab57fa3ceb
}