bitbox02_rust/hal: add ui enter string

diff --git a/src/rust/bitbox02-rust/src/hal/bitbox02/ui.rs b/src/rust/bitbox02-rust/src/hal/bitbox02/ui.rs
index 7f19aa4..39f84a4 100644
--- a/src/rust/bitbox02-rust/src/hal/bitbox02/ui.rs
+++ b/src/rust/bitbox02-rust/src/hal/bitbox02/ui.rs
@@ -3,7 +3,7 @@
 use alloc::string::String;
 
 use crate::hal::Ui;
-use crate::hal::ui::{ConfirmParams, Font, UserAbort};
+use crate::hal::ui::{ConfirmParams, EnterStringParams, Font, UserAbort};
 use crate::workflow::trinary_input_string;
 
 pub struct BitBox02Ui;
@@ -32,6 +32,21 @@ fn to_bitbox02_confirm_params<'a>(
     }
 }
 
+fn to_bitbox02_trinary_input_string_params<'a>(
+    params: &'a EnterStringParams<'a>,
+) -> bitbox02::ui::TrinaryInputStringParams<'a> {
+    bitbox02::ui::TrinaryInputStringParams {
+        title: params.title,
+        wordlist: params.wordlist,
+        number_input: params.number_input,
+        hide: params.hide,
+        special_chars: params.special_chars,
+        longtouch: params.longtouch,
+        cancel_is_backbutton: params.cancel_is_backbutton,
+        default_to_digits: params.default_to_digits,
+    }
+}
+
 impl Ui for BitBox02Ui {
     #[inline(always)]
     async fn confirm(&mut self, params: &ConfirmParams<'_>) -> Result<(), UserAbort> {
@@ -71,15 +86,16 @@ impl Ui for BitBox02Ui {
     #[inline(always)]
     async fn enter_string(
         &mut self,
-        params: &trinary_input_string::Params<'_>,
+        params: &EnterStringParams<'_>,
         can_cancel: trinary_input_string::CanCancel,
         preset: &str,
     ) -> Result<zeroize::Zeroizing<String>, UserAbort> {
+        let params = to_bitbox02_trinary_input_string_params(params);
         let can_cancel = match can_cancel {
             trinary_input_string::CanCancel::Yes => true,
             trinary_input_string::CanCancel::No => false,
         };
-        bitbox02::ui::trinary_input_string(params, can_cancel, preset)
+        bitbox02::ui::trinary_input_string(&params, can_cancel, preset)
             .await
             .map_err(|_| UserAbort)
     }
@@ -200,4 +216,49 @@ mod tests {
             assert_eq!(output.display_size, 42);
         }
     }
+
+    #[test]
+    fn test_to_bitbox02_trinary_input_string_params() {
+        let input_without_wordlist = EnterStringParams {
+            title: "Enter",
+            wordlist: None,
+            number_input: true,
+            hide: true,
+            special_chars: true,
+            longtouch: true,
+            cancel_is_backbutton: true,
+            default_to_digits: true,
+        };
+        let output_without_wordlist =
+            to_bitbox02_trinary_input_string_params(&input_without_wordlist);
+        assert_eq!(output_without_wordlist.title, "Enter");
+        assert!(output_without_wordlist.wordlist.is_none());
+        assert!(output_without_wordlist.number_input);
+        assert!(output_without_wordlist.hide);
+        assert!(output_without_wordlist.special_chars);
+        assert!(output_without_wordlist.longtouch);
+        assert!(output_without_wordlist.cancel_is_backbutton);
+        assert!(output_without_wordlist.default_to_digits);
+
+        let wordlist = [1u16, 2, 3];
+        let input_with_wordlist = EnterStringParams {
+            title: "Seed",
+            wordlist: Some(&wordlist),
+            number_input: false,
+            hide: false,
+            special_chars: false,
+            longtouch: false,
+            cancel_is_backbutton: false,
+            default_to_digits: false,
+        };
+        let output_with_wordlist = to_bitbox02_trinary_input_string_params(&input_with_wordlist);
+        assert_eq!(output_with_wordlist.title, "Seed");
+        assert_eq!(output_with_wordlist.wordlist.unwrap(), wordlist.as_slice());
+        assert!(!output_with_wordlist.number_input);
+        assert!(!output_with_wordlist.hide);
+        assert!(!output_with_wordlist.special_chars);
+        assert!(!output_with_wordlist.longtouch);
+        assert!(!output_with_wordlist.cancel_is_backbutton);
+        assert!(!output_with_wordlist.default_to_digits);
+    }
 }
diff --git a/src/rust/bitbox02-rust/src/hal/testing/ui.rs b/src/rust/bitbox02-rust/src/hal/testing/ui.rs
index 1c352fb..57d36bc 100644
--- a/src/rust/bitbox02-rust/src/hal/testing/ui.rs
+++ b/src/rust/bitbox02-rust/src/hal/testing/ui.rs
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: Apache-2.0
 
 use crate::hal::Ui;
-use crate::hal::ui::{ConfirmParams, UserAbort};
+use crate::hal::ui::{ConfirmParams, EnterStringParams, UserAbort};
 use crate::workflow::trinary_input_string;
 
 use alloc::boxed::Box;
@@ -34,10 +34,7 @@ pub enum Screen {
     More,
 }
 
-type EnterStringCb<'a> = Box<
-    dyn FnMut(&trinary_input_string::Params<'_>) -> Result<String, trinary_input_string::Error>
-        + 'a,
->;
+type EnterStringCb<'a> = Box<dyn FnMut(&EnterStringParams<'_>) -> Result<String, UserAbort> + 'a>;
 
 /// A Ui implementation for unit tests. Collects all screens and provides helper functions
 /// to verify them.
@@ -116,7 +113,7 @@ impl Ui for TestingUi<'_> {
 
     async fn enter_string(
         &mut self,
-        params: &trinary_input_string::Params<'_>,
+        params: &EnterStringParams<'_>,
         _can_cancel: trinary_input_string::CanCancel,
         _preset: &str,
     ) -> Result<zeroize::Zeroizing<String>, UserAbort> {
diff --git a/src/rust/bitbox02-rust/src/hal/ui.rs b/src/rust/bitbox02-rust/src/hal/ui.rs
index abdb9bf..dc078f4 100644
--- a/src/rust/bitbox02-rust/src/hal/ui.rs
+++ b/src/rust/bitbox02-rust/src/hal/ui.rs
@@ -35,6 +35,20 @@ pub struct ConfirmParams<'a> {
     pub display_size: usize,
 }
 
+#[derive(Default)]
+pub struct EnterStringParams<'a> {
+    /// The confirmation title of the screen. Max 200 chars, otherwise **panic**.
+    pub title: &'a str,
+    /// Currently specialized to the BIP39 wordlist: a list of BIP39 word indices. Can be extended if needed.
+    pub wordlist: Option<&'a [u16]>,
+    pub number_input: bool,
+    pub hide: bool,
+    pub special_chars: bool,
+    pub longtouch: bool,
+    pub cancel_is_backbutton: bool,
+    pub default_to_digits: bool,
+}
+
 #[allow(async_fn_in_trait)]
 pub trait Ui {
     /// Returns `Ok(())` if the user accepts, `Err(UserAbort)` if the user rejects.
@@ -56,7 +70,7 @@ pub trait Ui {
     /// If `preset` is not empty, it must be part of `params.wordlist` and will be pre-entered.
     async fn enter_string(
         &mut self,
-        params: &trinary_input_string::Params<'_>,
+        params: &EnterStringParams<'_>,
         can_cancel: trinary_input_string::CanCancel,
         preset: &str,
     ) -> Result<zeroize::Zeroizing<String>, UserAbort>;
diff --git a/src/rust/bitbox02-rust/src/hww/api/bip85.rs b/src/rust/bitbox02-rust/src/hww/api/bip85.rs
index 4b13884..c79de90 100644
--- a/src/rust/bitbox02-rust/src/hww/api/bip85.rs
+++ b/src/rust/bitbox02-rust/src/hww/api/bip85.rs
@@ -76,7 +76,7 @@ async fn process_bip39(hal: &mut impl crate::hal::Hal) -> Result<(), Error> {
             let number_string = hal
                 .ui()
                 .enter_string(
-                    &trinary_input_string::Params {
+                    &crate::hal::ui::EnterStringParams {
                         title: "Enter index",
                         number_input: true,
                         longtouch: true,
diff --git a/src/rust/bitbox02-rust/src/hww/api/bitcoin/registration.rs b/src/rust/bitbox02-rust/src/hww/api/bitcoin/registration.rs
index f68520b..40eb0de 100644
--- a/src/rust/bitbox02-rust/src/hww/api/bitcoin/registration.rs
+++ b/src/rust/bitbox02-rust/src/hww/api/bitcoin/registration.rs
@@ -75,7 +75,7 @@ async fn get_name(
         let name = hal
             .ui()
             .enter_string(
-                &trinary_input_string::Params {
+                &crate::hal::ui::EnterStringParams {
                     title: "Enter account name",
                     longtouch: true,
                     ..Default::default()
diff --git a/src/rust/bitbox02-rust/src/workflow/mnemonic.rs b/src/rust/bitbox02-rust/src/workflow/mnemonic.rs
index 2ed6a12..d54afec 100644
--- a/src/rust/bitbox02-rust/src/workflow/mnemonic.rs
+++ b/src/rust/bitbox02-rust/src/workflow/mnemonic.rs
@@ -237,7 +237,7 @@ async fn get_12th_18th_word(
         let choices = lastword_choices(entered_words);
         let word = hal_ui
             .enter_string(
-                &trinary_input_string::Params {
+                &crate::hal::ui::EnterStringParams {
                     title,
                     wordlist: Some(&choices),
                     ..Default::default()
@@ -311,7 +311,7 @@ pub async fn get(
         } else {
             hal_ui
                 .enter_string(
-                    &trinary_input_string::Params {
+                    &crate::hal::ui::EnterStringParams {
                         title: &title,
                         wordlist: Some(&bip39_wordlist),
                         ..Default::default()
diff --git a/src/rust/bitbox02-rust/src/workflow/password.rs b/src/rust/bitbox02-rust/src/workflow/password.rs
index 6087771..b15c42c 100644
--- a/src/rust/bitbox02-rust/src/workflow/password.rs
+++ b/src/rust/bitbox02-rust/src/workflow/password.rs
@@ -46,7 +46,7 @@ pub async fn enter(
     password_type: PasswordType,
     can_cancel: CanCancel,
 ) -> Result<zeroize::Zeroizing<String>, EnterError> {
-    let params = trinary_input_string::Params {
+    let params = crate::hal::ui::EnterStringParams {
         title,
         hide: true,
         special_chars: match password_type {
diff --git a/src/rust/bitbox02-rust/src/workflow/trinary_input_string.rs b/src/rust/bitbox02-rust/src/workflow/trinary_input_string.rs
index c8e2edd..1b0ceb3 100644
--- a/src/rust/bitbox02-rust/src/workflow/trinary_input_string.rs
+++ b/src/rust/bitbox02-rust/src/workflow/trinary_input_string.rs
@@ -1,8 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
 
-pub use crate::hal::ui::UserAbort as Error;
-pub use bitbox02::ui::{TrinaryInputStringParams as Params, trinary_input_string};
-
 #[derive(Copy, Clone)]
 pub enum CanCancel {
     No,