diff --git a/ctru-rs/examples/hashmaps.rs b/ctru-rs/examples/hashmaps.rs
new file mode 100644
index 0000000..d0aab20
--- /dev/null
+++ b/ctru-rs/examples/hashmaps.rs
@@ -0,0 +1,39 @@
+use ctru::console::Console;
+use ctru::gfx::Gfx;
+use ctru::services::apt::Apt;
+use ctru::services::hid::{Hid, KeyPad};
+use ctru::services::ps::Ps;
+
+fn main() {
+    // Initialize services
+    ctru::init();
+    let apt = Apt::init().unwrap();
+    let hid = Hid::init().unwrap();
+    let gfx = Gfx::default();
+    let _console = Console::init(gfx.top_screen.borrow_mut());
+
+    // HashMaps generate hashes thanks to the 3DS' criptografically secure generator.
+    // Sadly, this generator is only active when activating the `Ps` service.
+    // To do this, we have to make sure the `Ps` service handle is alive for the whole
+    // run time (or at least, when `HashMaps` are used).
+    // Not having a living `Ps` instance when using `HashMap`s results in a panic
+    let _ps = Ps::init().unwrap();
+
+    let mut map = std::collections::HashMap::new();
+    map.insert("A Key!", 102);
+    map.insert("Another key?", 543);
+    map.remove("A Key!");
+
+    println!("{:#?}", map);
+
+    while apt.main_loop() {
+        gfx.flush_buffers();
+        gfx.swap_buffers();
+        gfx.wait_for_vblank();
+
+        hid.scan_input();
+        if hid.keys_down().contains(KeyPad::KEY_START) {
+            break;
+        }
+    }
+}
diff --git a/ctru-rs/src/services/ps.rs b/ctru-rs/src/services/ps.rs
index 5e9adfa..5b1ca27 100644
--- a/ctru-rs/src/services/ps.rs
+++ b/ctru-rs/src/services/ps.rs
@@ -8,6 +8,30 @@
 #[non_exhaustive]
 pub struct Ps;
 
+#[repr(u32)]
+pub enum AESAlgorithm {
+    CbcEnc,
+    CbcDec,
+    CtrEnc,
+    CtrDec,
+    CcmEnc,
+    CcmDec,
+}
+
+#[repr(u32)]
+pub enum AESKeyType {
+    Keyslot0D,
+    Keyslot2D,
+    Keyslot31,
+    Keyslot38,
+    Keyslot32,
+    Keyslot39Dlp,
+    Keyslot2E,
+    KeyslotInvalid,
+    Keyslot36,
+    Keyslot39Nfc,
+}
+
 impl Ps {
     /// Initialize the PS module.
     pub fn init() -> crate::Result<Self> {
@@ -18,6 +42,38 @@ impl Ps {
             Ok(Self)
         }
     }
+
+    pub fn local_friend_code_seed(&self) -> crate::Result<u64> {
+        let mut seed: u64 = 0;
+
+        let r = unsafe { ctru_sys::PS_GetLocalFriendCodeSeed(&mut seed) };
+        if r < 0 {
+            Err(r.into())
+        } else {
+            Ok(seed)
+        }
+    }
+
+    pub fn device_id(&self) -> crate::Result<u32> {
+        let mut id: u32 = 0;
+
+        let r = unsafe { ctru_sys::PS_GetDeviceId(&mut id) };
+        if r < 0 {
+            Err(r.into())
+        } else {
+            Ok(id)
+        }
+    }
+
+    pub fn generate_random_bytes(&self, out: &mut [u8]) -> crate::Result<()> {
+        let r =
+            unsafe { ctru_sys::PS_GenerateRandomBytes(out as *mut _ as *mut _, out.len() as u32) };
+        if r < 0 {
+            Err(r.into())
+        } else {
+            Ok(())
+        }
+    }
 }
 
 impl Drop for Ps {