Zig

HMAC Hex String

See more Encryption Examples

Demonstrates how to compute an HMAC using a hexidecimal key and data. 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 HMAC
    crypt.setMacAlgorithm("hmac");

    // Our HMAC key will be the bytes represented in the following hex string.
    // In other words, the HMAC key is composed of the bytes 0x41, 0xC2, 0x1C, ...
    // (It is not composed of the us-ascii string '4', '1', 'C', ...)
    const key_hex = "41C21CB9D7A02FC5D4FADB9E4755B9DE";
    try crypt.setMacKeyEncoded(key_hex, "hex");

    // Our desire is to HMAC the bytes represented in the following string:
    const data_hex = "C22078065B01460001000000010062043BF5B18228C8E02D17BCFE4E00561FA6DEC216EA97195CEB579942E275C21932258E3CD391E507FF4E7FD4C787A8447DA111C54A9C1795E7FF4C0BAA2EDA";

    // We'll need to decode the hex to binary:
    const bd = try chilkat.BinData.init();
    defer bd.deinit();
    bd.appendEncoded(data_hex, "hex") catch {};

    // Do the HMAC-SHA256 hash and return as a hex string:
    crypt.setEncodingMode("hex");
    crypt.setHashAlgorithm("sha-256");
    const mac_hex = try crypt.macBdENC(alloc, bd);
    std.debug.print("{s}\n", .{mac_hex});
}