feat: switch text to UTF-8; add Unicode key events, dead keys & Czech layout; fix numpad navigation; add NumLock support

programs/include/montauk/user.h

@@ -9,6 +9,7 @@
 #include <montauk/string.h>
 #include <montauk/heap.h>
 #include <montauk/config.h>
+#include <montauk/utf8.h>
 #include <bearssl_hash.h>
 
 namespace montauk {
@@ -107,7 +108,7 @@ namespace user {
         bytes_to_hex(hash, 32, out_hex64);
     }
 
-    inline bool verify_password(const char* password, const char* salt_hex, const char* stored_hex64) {
+    inline bool verify_password_bytes(const char* password, const char* salt_hex, const char* stored_hex64) {
         char computed[65];
         hash_password(password, salt_hex, computed);
 
@@ -118,6 +119,26 @@ namespace user {
         return diff == 0;
     }
 
+    // Passwords are hashed as UTF-8. Before the switch to UTF-8, password
+    // fields stored typed characters as Windows-1252 bytes, so a non-ASCII
+    // password set back then only matches its 1252 form; try that too.
+    inline bool verify_password(const char* password, const char* salt_hex, const char* stored_hex64) {
+        if (verify_password_bytes(password, salt_hex, stored_hex64)) return true;
+
+        char legacy[256];
+        int o = 0;
+        bool non_ascii = false;
+        for (const char* p = password; *p;) {
+            uint32_t cp = montauk::utf8::next(&p);
+            uint8_t b = montauk::utf8::to_cp1252(cp);
+            if (b == 0 || o >= (int)sizeof(legacy) - 1) return false;
+            if (b >= 0x80) non_ascii = true;
+            legacy[o++] = (char)b;
+        }
+        legacy[o] = '\0';
+        return non_ascii && verify_password_bytes(legacy, salt_hex, stored_hex64);
+    }
+
     // ---- User database I/O ----
 
     inline int load_users(UserInfo* buf, int max) {