esphome:
  on_boot:
    - lambda: |-
        // Test HMAC-SHA256 functionality
        #ifdef USE_SHA256
        using esphome::hmac_sha256::HmacSHA256;
        HmacSHA256 hmac;

        // Test with key "key" and message "The quick brown fox jumps over the lazy dog"
        const char* key = "key";
        const char* message = "The quick brown fox jumps over the lazy dog";

        hmac.init(key, strlen(key));
        hmac.add(message, strlen(message));
        hmac.calculate();

        char hex_output[65];
        hmac.get_hex(hex_output);
        hex_output[64] = '\0';

        ESP_LOGD("HMAC_SHA256", "HMAC-SHA256('%s', '%s') = %s", key, message, hex_output);

        // Expected: f7bc83f430538424b13298e6aa6fb143ef4d59a14946175997479dbc2d1a3cd8
        const char* expected = "f7bc83f430538424b13298e6aa6fb143ef4d59a14946175997479dbc2d1a3cd8";
        if (strcmp(hex_output, expected) == 0) {
          ESP_LOGI("HMAC_SHA256", "Test PASSED");
        } else {
          ESP_LOGE("HMAC_SHA256", "Test FAILED. Expected %s", expected);
        }
        #else
        ESP_LOGW("HMAC_SHA256", "HMAC-SHA256 not available on this platform");
        #endif

hmac_sha256: