Add Stax layouts for generating SSKR shares

LedgerHQ · Aug 18, 2024 · 8db0a31 · 8db0a31
1 parent aa58ae5
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.8.0] - 2024-07-29
+
+### Added
+
+- Add Stax layouts for generating SSKR shares
+
 ## [1.7.4] - 2024-06-20
 
 ### Fixed
@@ -28,7 +34,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Using Ledger SDK `cx_crc32()` function rather than buggy `cx_crc32_hw()`.
 - Fix build with SDK master for Nano S
 
-## [1.7.1] - 2024-03-06
+## [1.7.1] - 2024-04-06
 
 ### Changed
 

diff --git a/Makefile b/Makefile
@@ -27,8 +27,8 @@ all: default
 
 APPNAME = "Seed Tool"
 APPVERSION_M = 1
-APPVERSION_N = 7
-APPVERSION_P = 4
+APPVERSION_N = 8
+APPVERSION_P = 0
 APPVERSION   = "$(APPVERSION_M).$(APPVERSION_N).$(APPVERSION_P)"
 
 APPVERSION_RC = 0

diff --git a/README.md b/README.md
@@ -6,9 +6,10 @@
 [![License](https://img.shields.io/github/license/aido/app-seed-tool)](https://github.com/aido/app-seed-tool/blob/develop/LICENSE)
 
 ![nanos](https://img.shields.io/badge/nanos-working-green?logo=data:image/svg%2bxml;base64,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)
-![nanox](https://img.shields.io/badge/nanox-working-green?logo=data:image/svg%2bxml;base64,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)
 ![nanosp](https://img.shields.io/badge/nanosp-working-green?logo=data:image/svg%2bxml;base64,PHN2ZyB3aWR0aD0iMTQ3IiBoZWlnaHQ9IjEyOCIgdmlld0JveD0iMCAwIDE0NyAxMjgiIGZpbGw9Im5vbmUiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+PHBhdGggZD0iTTAgOTEuNjU0OFYxMjhINTUuMjkzVjExOS45NEg4LjA1NjMxVjkxLjY1NDhIMFpNMTM4Ljk0NCA5MS42NTQ4VjExOS45NEg5MS43MDdWMTI3Ljk5OEgxNDdWOTEuNjU0OEgxMzguOTQ0Wk01NS4zNzMzIDM2LjM0NTJWOTEuNjUyOUg5MS43MDdWODQuMzg0Mkg2My40Mjk2VjM2LjM0NTJINTUuMzczM1pNMCAwVjM2LjM0NTJIOC4wNTYzMVY4LjA1ODQ0SDU1LjI5M1YwSDBaTTkxLjcwNyAwVjguMDU4NDRIMTM4Ljk0NFYzNi4zNDUySDE0N1YwSDkxLjcwN1oiIGZpbGw9IndoaXRlIi8+PC9zdmc+)
+![nanox](https://img.shields.io/badge/nanox-working-green?logo=data:image/svg%2bxml;base64,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)
 ![stax](https://img.shields.io/badge/stax-in_progress-orange?logo=data:image/svg%2bxml;base64,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)
+![flex](https://img.shields.io/badge/flex-in_progress-orange?logo=data:image/svg%2bxml;base64,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)
 
 [![Build app-seed-tool](https://github.com/aido/app-seed-tool/actions/workflows/ci-workflow.yml/badge.svg)](https://github.com/aido/app-seed-tool/actions/workflows/ci-workflow.yml)
 [![CodeQL](https://github.com/aido/app-seed-tool/actions/workflows/codeql-workflow.yml/badge.svg)](https://github.com/aido/app-seed-tool/actions/workflows/codeql-workflow.yml)
@@ -23,13 +24,13 @@ Use the utilities provided by this Ledger application to check a backed up BIP-3
 Not all Ledger devices are equal. The older, less capable devices do not have the capacity to provide a full range of seed utilities. The following table lists the seed utilities provided by each devices type:
 <div align="center">
 
-||Nano S|Nano S+|Nano X|Stax|
-| :--- | :---: | :---: | :---: | :---: |
-|[Check BIP39](#check-bip39)|$${\color{green}✓}$$|$${\color{green}✓}$$|$${\color{green}✓}$$|$${\color{green}✓}$$|
-|[Check Shamir's secret shares](#check-shamirs-secret-shares)|$${\color{green}✓}$$|$${\color{green}✓}$$|$${\color{green}✓}$$|$${\color{orange}✓}$$|
-|[Generate Shamir's secret sharing](#generate-shamirs-secret-sharing)|$${\color{green}✓}$$|$${\color{green}✓}$$|$${\color{green}✓}$$|$${\color{orange}✓}$$|
-|[Recover BIP39](#recover-bip39)|$${\color{green}✓}$$|$${\color{green}✓}$$|$${\color{green}✓}$$|$${\color{orange}✓}$$|
-|[Generate BIP85](#generate-bip85)|$${\color{red}✗}$$|$${\color{orange}✓}$$|$${\color{orange}✓}$$|$${\color{orange}✓}$$|
+||Nano S|Nano S+|Nano X|Stax|Flex|
+| :--- | :---: | :---: | :---: | :---: | :---: |
+|[Check BIP39](#check-bip39)|$${\color{green}✓}$$|$${\color{green}✓}$$|$${\color{green}✓}$$|$${\color{green}✓}$$|$${\color{orange}✓}$$|
+|[Check Shamir's secret shares](#check-shamirs-secret-shares)|$${\color{green}✓}$$|$${\color{green}✓}$$|$${\color{green}✓}$$|$${\color{orange}✓}$$|$${\color{orange}✓}$$|
+|[Generate Shamir's secret sharing](#generate-shamirs-secret-sharing)|$${\color{green}✓}$$|$${\color{green}✓}$$|$${\color{green}✓}$$|$${\color{green}✓}$$|$${\color{orange}✓}$$|
+|[Recover BIP39](#recover-bip39)|$${\color{green}✓}$$|$${\color{green}✓}$$|$${\color{green}✓}$$|$${\color{orange}✓}$$|$${\color{orange}✓}$$|
+|[Generate BIP85](#generate-bip85)|$${\color{red}✗}$$|$${\color{orange}✓}$$|$${\color{orange}✓}$$|$${\color{orange}✓}$$|$${\color{orange}✓}$$|
 </div>
 
 ## Application menu flow

diff --git a/src/constants.h b/src/constants.h
@@ -19,13 +19,13 @@
 #define ONBOARDING_WORD_COMPLETION_MAX_ITEMS 8
 #define BOLOS_UX_HASH_LENGTH                 4  // as on the blue
 
-#define MAX_WORD_LENGTH   8
-#define MAX_NUMBER_LENGTH 2
+#define BIP39_MAX_WORD_LENGTH 8
+#define MAX_NUMBER_LENGTH     2
 
 enum {
-    MNEMONIC_SIZE_12 = 12,
-    MNEMONIC_SIZE_18 = 18,
-    MNEMONIC_SIZE_24 = 24,
+    BIP39_MNEMONIC_SIZE_12 = 12,
+    BIP39_MNEMONIC_SIZE_18 = 18,
+    BIP39_MNEMONIC_SIZE_24 = 24,
 };
 
 // Type of onboarding we are performing (BIP39 or SSKR)

diff --git a/src/nano/ui_nano.c b/src/nano/ui_nano.c
@@ -35,13 +35,13 @@ const char* number_of_bip39_words_getter(unsigned int idx) {
 void number_of_bip39_words_selector(unsigned int idx) {
     switch (idx) {
         case 0:
-            G_bolos_ux_context.onboarding_kind = MNEMONIC_SIZE_12;
+            G_bolos_ux_context.onboarding_kind = BIP39_MNEMONIC_SIZE_12;
             goto word_init;
         case 1:
-            G_bolos_ux_context.onboarding_kind = MNEMONIC_SIZE_18;
+            G_bolos_ux_context.onboarding_kind = BIP39_MNEMONIC_SIZE_18;
             goto word_init;
         case 2:
-            G_bolos_ux_context.onboarding_kind = MNEMONIC_SIZE_24;
+            G_bolos_ux_context.onboarding_kind = BIP39_MNEMONIC_SIZE_24;
             goto word_init;
         word_init:
             screen_onboarding_bip39_restore_init();

diff --git a/src/stax/mnemonic.c → src/stax/bip39_mnemonic.c b/src/stax/mnemonic.c → src/stax/bip39_mnemonic.c
@@ -2,24 +2,24 @@
 #include <string.h>
 
 #include "../ux_common/common_bip39.h"
-#include "./mnemonic.h"
+#include "./bip39_mnemonic.h"
 
 #if defined(TARGET_STAX)
 
-typedef struct buffer {
+typedef struct bip39_buffer_struct {
     // the mnemonic passphrase, built over time
-    char buffer[MAX_MNEMONIC_LENGTH];
+    char buffer[BIP39_MNEMONIC_MAX_LENGTH];
     // current length of the mnemonic passphrase
     size_t length;
     // index of the current word ((size_t)-1 mean there is no word currently)
     size_t current_word_index;
     // array of every stored word lengths (used for removing them if needed)
-    size_t word_lengths[MNEMONIC_SIZE_24];
+    size_t word_lengths[BIP39_MNEMONIC_SIZE_24];
     // expected number of word in the final mnemonic (12 or 18 or 24)
     size_t final_size;
-} buffer_t;
+} bip39_buffer_t;
 
-static buffer_t mnemonic = {0};
+static bip39_buffer_t mnemonic = {0};
 
 size_t mnemonic_shrink(const size_t size) {
     if (size == 0 || size > mnemonic.length) {
@@ -28,41 +28,41 @@ size_t mnemonic_shrink(const size_t size) {
     } else {
         mnemonic.length -= size;
     }
-    memzero(&mnemonic.buffer[mnemonic.length], MAX_MNEMONIC_LENGTH - mnemonic.length);
+    memzero(&mnemonic.buffer[mnemonic.length], BIP39_MNEMONIC_MAX_LENGTH - mnemonic.length);
     return mnemonic.length;
 }
 
-void set_mnemonic_final_size(const size_t size) {
+void bip39_mnemonic_final_size_set(const size_t size) {
     mnemonic.final_size = size;
 }
 
-size_t get_mnemonic_final_size() {
+size_t bip39_mnemonic_final_size_get(void) {
     return mnemonic.final_size;
 }
 
-size_t get_current_word_number() {
+size_t bip39_mnemonic_current_word_number_get(void) {
     return mnemonic.current_word_index + 1;
 }
 
-void reset_mnemonic() {
+void bip39_mnemonic_reset(void) {
     memzero(&mnemonic, sizeof(mnemonic));
     mnemonic.current_word_index = (size_t) -1;
 }
 
-bool remove_word_from_mnemonic() {
-    PRINTF("Removing a word, currently there is '%ld' of them\n", mnemonic.current_word_index + 1);
+bool bip39_mnemonic_word_remove(void) {
+    PRINTF("Removing a word, currently there is '%d' of them\n", mnemonic.current_word_index + 1);
     if (mnemonic.current_word_index == (size_t) -1) {
         return false;
     }
     const size_t current_length = mnemonic.word_lengths[mnemonic.current_word_index];
     mnemonic.current_word_index--;
     // removing previous word from mnemonic buffer (+ 1 blank space)
     mnemonic_shrink(current_length + 1);
-    PRINTF("Number of remaining words in the mnemonic: '%ld'\n", mnemonic.current_word_index + 1);
+    PRINTF("Number of remaining words in the mnemonic: '%d'\n", mnemonic.current_word_index + 1);
     return true;
 }
 
-size_t add_word_in_mnemonic(const char* const buffer, const size_t size) {
+size_t bip39_mnemonic_word_add(const char* const buffer, const size_t size) {
     if (mnemonic.current_word_index != (size_t) -1) {
         // adding an extra white space ' ' between words
         mnemonic.buffer[mnemonic.length++] = ' ';
@@ -72,35 +72,38 @@ size_t add_word_in_mnemonic(const char* const buffer, const size_t size) {
     mnemonic.length += size;
     mnemonic.current_word_index++;
     mnemonic.word_lengths[mnemonic.current_word_index] = size;
-    PRINTF("Number of words in the mnemonic: '%ld'\n", get_current_word_number());
+    PRINTF("Number of words in the mnemonic: '%d'\n", bip39_mnemonic_current_word_number_get());
     PRINTF("Current mnemonic: '%s'\n", &mnemonic.buffer[0]);
-    return get_current_word_number();
+    return bip39_mnemonic_current_word_number_get();
 }
 
-bool is_mnemonic_complete() {
+bool bip39_mnemonic_complete_check(void) {
     return (mnemonic.final_size == 0
                 ? false
-                : (mnemonic.current_word_index + 1) >= get_mnemonic_final_size());
+                : (mnemonic.current_word_index + 1) >= bip39_mnemonic_final_size_get());
 }
 
-bool check_mnemonic() {
-    if (!is_mnemonic_complete()) {
+bool bip39_mnemonic_check(void) {
+    if (!bip39_mnemonic_complete_check()) {
         return false;
     }
-    PRINTF("Checking the following mnemonic: '%s' (size %ld)\n",
+    PRINTF("Checking the following mnemonic: '%s' (size %d)\n",
            &mnemonic.buffer[0],
            mnemonic.length);
     const bool result =
         bolos_ux_bip39_mnemonic_check((unsigned char*) &mnemonic.buffer[0], mnemonic.length);
     // Don;t clear the mneminic just yet as we may need it to generate SSKR shares
-    //    reset_mnemonic();
+    //    bip39_mnemonic_reset();
     return result;
 }
 
-#if defined(TEST)
-char* get_mnemonic() {
+// Used for BIP39 <-> SSKR roundtrip
+char* bip39_mnemonic_get(void) {
     return mnemonic.buffer;
 }
-#endif
+
+size_t bip39_mnemonic_length_get(void) {
+    return mnemonic.length;
+}
 
 #endif
diff --git a/src/stax/mnemonic.h → src/stax/bip39_mnemonic.h b/src/stax/mnemonic.h → src/stax/bip39_mnemonic.h
@@ -21,52 +21,58 @@
 
 #if defined(TARGET_STAX)
 
-#define memzero(...)        explicit_bzero(__VA_ARGS__)
-#define MAX_MNEMONIC_LENGTH (MNEMONIC_SIZE_24 * (MAX_WORD_LENGTH + 1))
+#define memzero(...)              explicit_bzero(__VA_ARGS__)
+#define BIP39_MNEMONIC_MAX_LENGTH (BIP39_MNEMONIC_SIZE_24 * (BIP39_MAX_WORD_LENGTH + 1))
 
 /*
  * Sets how many words are expected in the mnemonic passphrase
  */
-void set_mnemonic_final_size(const size_t size);
+void bip39_mnemonic_final_size_set(const size_t size);
 
 /*
  * Returns how many words are expected in the mnemonic passphrase
  */
-size_t get_mnemonic_final_size(void);
+size_t bip39_mnemonic_final_size_get(void);
 
 /*
  * Returns how many words are currently stored in the mnemonic
  */
-size_t get_current_word_number(void);
+size_t bip39_mnemonic_current_word_number_get(void);
 
 /*
  * Check if the current number of words in the mnemonic fits the expected number of words
  */
-bool is_mnemonic_complete(void);
+bool bip39_mnemonic_complete_check(void);
 
 /*
  * Check if the currently stored mnemonic generates the same seed as the current device's one
  */
-bool check_mnemonic(void);
+bool bip39_mnemonic_check(void);
 
 /*
  * Erase all information and reset the indexes
  */
-void reset_mnemonic(void);
+void bip39_mnemonic_reset(void);
 
 /*
  * Remove the latest word from the passphrase, returns true if there was at least one to remove,
  * else false (there was no word)
  */
-bool remove_word_from_mnemonic(void);
+bool bip39_mnemonic_word_remove(void);
 
 /*
  * Adds a word in the passphrase, returns how many words are stored in the mnemonic
  */
-size_t add_word_in_mnemonic(const char* const buffer, const size_t size);
+size_t bip39_mnemonic_word_add(const char* const buffer, const size_t size);
 
-#if defined(TEST)
-char* get_mnemonic();
-#endif
+/*
+ * Returns the mnemonic passphrase
+ */
+char* bip39_mnemonic_get(void);
+
+/*
+ * Returns length of the mnemonic passphrase
+ */
+size_t bip39_mnemonic_length_get(void);
 
-#endif  // TARGET_NANOS
+#endif  // TARGET_STAX
diff --git a/src/stax/layout_generic_screen.c b/src/stax/layout_generic_screen.c
@@ -68,7 +68,7 @@ nbgl_button_t *generic_screen_set_back_button() {
     button->obj.area.height = BUTTON_DIAMETER;
     button->radius = BUTTON_RADIUS;
     button->text = NULL;
-    button->icon = &C_leftArrow32px;
+    button->icon = &C_Back_32px;
     button->obj.alignmentMarginX = 0;
     button->obj.alignmentMarginY = UPPER_MARGIN;
     button->obj.alignment = TOP_LEFT;

diff --git a/src/stax/sskr_shares.c b/src/stax/sskr_shares.c
@@ -0,0 +1,75 @@
+#include <os.h>
+#include <string.h>
+
+#include "../ux_common/common_sskr.h"
+#include "./sskr_shares.h"
+#include "./bip39_mnemonic.h"
+
+#if defined(TARGET_STAX)
+
+typedef struct sskr_buffer_struct {
+    // The SSKR shares, built over time
+    char buffer[SSKR_SHARES_MAX_LENGTH];
+    // current length of the shares buffer
+    unsigned int length;
+    unsigned int group_descriptor[1][2];
+    uint8_t count;
+} sskr_buffer_t;
+
+static sskr_buffer_t shares = {0};
+
+void sskr_sharenum_set(const uint8_t sharenum) {
+    shares.group_descriptor[0][1] = sharenum;
+}
+
+uint8_t sskr_sharenum_get(void) {
+    return shares.group_descriptor[0][1];
+}
+
+void sskr_threshold_set(const uint8_t threshold) {
+    shares.group_descriptor[0][0] = threshold;
+}
+
+uint8_t sskr_threshold_get(void) {
+    return shares.group_descriptor[0][0];
+}
+
+uint8_t sskr_sharecount_get(void) {
+    return shares.count;
+}
+
+void sskr_shares_reset(void) {
+    memzero(&shares, sizeof(shares));
+}
+
+void sskr_shares_from_bip39_mnemonic(void) {
+    shares.length = 0;
+
+    bolos_ux_bip39_to_sskr_convert((unsigned char*) bip39_mnemonic_get(),
+                                   bip39_mnemonic_length_get(),
+                                   bip39_mnemonic_final_size_get(),
+                                   shares.group_descriptor[0],
+                                   &shares.count,
+                                   (unsigned char*) shares.buffer,
+                                   &shares.length);
+
+    if (shares.count > 0) {
+        PRINTF("SSKR share count is %d\n", shares.count);
+        PRINTF("SSKR share buffer length is %d\n", shares.length);
+        for (uint8_t share = 0; share < shares.count; share++) {
+            PRINTF("SSKR share %d:\n", share + 1);
+            PRINTF("%.*s\n",
+                   shares.length / shares.count,
+                   shares.buffer + share * shares.length / shares.count);
+        }
+    }
+}
+
+char* sskr_shares_get(void) {
+    return shares.buffer;
+}
+
+size_t sskr_shares_length_get(void) {
+    return shares.length;
+}
+#endif