[New Feature] Derive Nostr privkey / pubkey via NIP-06

l10n/messages.pot

@@ -6,9 +6,9 @@
 #, fuzzy
 msgid ""
 msgstr ""
-"Project-Id-Version: seedsigner 0.8.5-rc1\n"
+"Project-Id-Version: seedsigner 0.8.5\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2025-01-28 13:28-0600\n"
+"POT-Creation-Date: 2025-04-23 11:43-0500\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <[email protected]>\n"
@@ -50,6 +50,27 @@ msgstr ""
 msgid "SD card inserted"
 msgstr ""
 
+#: src/seedsigner/gui/screens/nostr_screens.py
+#: src/seedsigner/views/nostr_views.py src/seedsigner/views/seed_views.py
+msgid "Export Nostr Key"
+msgstr ""
+
+#. Short for "Next step"
+#: src/seedsigner/gui/screens/nostr_screens.py
+#: src/seedsigner/gui/screens/seed_screens.py
+#: src/seedsigner/views/psbt_views.py src/seedsigner/views/seed_views.py
+#: src/seedsigner/views/tools_views.py
+msgid "Next"
+msgstr ""
+
+#: src/seedsigner/gui/screens/nostr_screens.py
+msgid "Public key:"
+msgstr ""
+
+#: src/seedsigner/gui/screens/nostr_screens.py
+msgid "Private key:"
+msgstr ""
+
 #: src/seedsigner/gui/screens/psbt_screens.py
 msgid "Review PSBT"
 msgstr ""
@@ -435,13 +456,6 @@ msgstr ""
 msgid "Review Message"
 msgstr ""
 
-#. Short for "Next step"
-#: src/seedsigner/gui/screens/seed_screens.py
-#: src/seedsigner/views/psbt_views.py src/seedsigner/views/seed_views.py
-#: src/seedsigner/views/tools_views.py
-msgid "Next"
-msgstr ""
-
 #: src/seedsigner/gui/screens/seed_screens.py
 msgid "Confirm Address"
 msgstr ""
@@ -762,6 +776,14 @@ msgstr ""
 msgid "BIP-85 child seeds"
 msgstr ""
 
+#: src/seedsigner/models/settings_definition.py
+msgid "Nostr NIP-06 keys"
+msgstr ""
+
+#: src/seedsigner/models/settings_definition.py
+msgid "Derive Nostr key from BIP-39 mnemonic"
+msgstr ""
+
 #: src/seedsigner/models/settings_definition.py
 msgid "Electrum seeds"
 msgstr ""
@@ -794,6 +816,46 @@ msgstr ""
 msgid "QR background color"
 msgstr ""
 
+#: src/seedsigner/views/nostr_views.py
+msgid "Keep keys separate!"
+msgstr ""
+
+#: src/seedsigner/views/nostr_views.py
+msgid "If this key already secures bitcoin, do not use it as your nostr key!"
+msgstr ""
+
+#. Option to export a nostr public key; do not translate "npub".
+#: src/seedsigner/views/nostr_views.py
+msgid "Public key: npub"
+msgstr ""
+
+#. Option to export a nostr public key; "hex" == hexadecimal format.
+#: src/seedsigner/views/nostr_views.py
+msgid "Public key: hex"
+msgstr ""
+
+#. Option to export a nostr private key; do not translate "nsec".
+#: src/seedsigner/views/nostr_views.py
+msgid "Private key: nsec"
+msgstr ""
+
+#. Option to export a nostr private key; "hex" == hexadecimal format.
+#: src/seedsigner/views/nostr_views.py
+msgid "Private key: hex"
+msgstr ""
+
+#: src/seedsigner/views/nostr_views.py
+msgid "Nostr Private Key"
+msgstr ""
+
+#: src/seedsigner/views/nostr_views.py
+msgid "Protect your key!"
+msgstr ""
+
+#: src/seedsigner/views/nostr_views.py
+msgid "Anyone with your private key has full control of your nostr identity."
+msgstr ""
+
 #: src/seedsigner/views/psbt_views.py src/seedsigner/views/seed_views.py
 #: src/seedsigner/views/tools_views.py
 msgid "Scan a seed"
@@ -1254,11 +1316,11 @@ msgid "Review SeedQR"
 msgstr ""
 
 #: src/seedsigner/views/seed_views.py
-msgid "Your transcribed SeedQR successfully scanned and yielded the same seed."
+msgid "Your transcribed SeedQR could not be read!"
 msgstr ""
 
 #: src/seedsigner/views/seed_views.py
-msgid "Your transcribed SeedQR could not be read!"
+msgid "Your transcribed SeedQR successfully scanned and yielded the same seed."
 msgstr ""
 
 #: src/seedsigner/views/seed_views.py

src/seedsigner/gui/components.py

@@ -39,6 +39,7 @@ class GUIConstants:
     TESTNET_COLOR = "#00F100"
     REGTEST_COLOR = "#00CAF1"
     GREEN_INDICATOR_COLOR = "#00FF00"
+    NOSTR_ACCENT_COLOR = "#dd23ef"
 
     ICON_FONT_NAME__FONT_AWESOME = "Font_Awesome_6_Free-Solid-900"
     ICON_FONT_NAME__SEEDSIGNER = "seedsigner-icons"

src/seedsigner/gui/screens/nostr_screens.py

@@ -0,0 +1,60 @@
+from gettext import gettext as _
+
+from dataclasses import dataclass
+from seedsigner.gui.components import GUIConstants, TextArea
+
+from seedsigner.gui.screens.screen import ButtonListScreen, ButtonOption, WarningEdgesMixin
+
+
+
+"""****************************************************************************
+    Nostr Key Export
+****************************************************************************"""
+@dataclass
+class BaseNostrKeyDisplayScreen(ButtonListScreen):
+    """
+    Base Screen class for either Nostr pubkey or privkey display.
+    """
+    key: str = None
+    is_pubkey: bool = True
+
+    def __post_init__(self):
+        # Customize defaults
+        self.title = _("Export Nostr Key")
+        self.button_data = [ButtonOption("Next")]
+        self.is_bottom_list = True
+
+        super().__post_init__()
+
+        keytype = TextArea(
+            text=_("Public key:") if self.is_pubkey else _("Private key:"),
+            is_text_centered=True,
+            screen_y=self.top_nav.height + GUIConstants.COMPONENT_PADDING
+        )
+        self.components.append(keytype)
+
+        # npub and nsec are 63 chars; hex format is 64 chars. Break into 4 lines.
+        chars_per_line = 16
+        key_str = "\n".join([s for s in [self.key[i:i+chars_per_line] for i in range(0, len(self.key), chars_per_line)]])
+
+        key_display = TextArea(
+            text=key_str,
+            font_name=GUIConstants.FIXED_WIDTH_FONT_NAME,
+            font_color=GUIConstants.NOSTR_ACCENT_COLOR,
+            font_size=GUIConstants.get_button_font_size(),  # Intentionally using a bigger font size
+            is_text_centered=True,
+        )
+        key_display.screen_y = keytype.screen_y + keytype.height + 2*GUIConstants.COMPONENT_PADDING
+        self.components.append(key_display)
+
+
+
+class NostrPublicKeyDisplayScreen(BaseNostrKeyDisplayScreen):
+    pass
+
+
+
+@dataclass
+class NostrPrivateKeyDisplayScreen(WarningEdgesMixin, BaseNostrKeyDisplayScreen):
+    status_color: str = GUIConstants.DIRE_WARNING_COLOR
+    is_pubkey: bool = False

src/seedsigner/helpers/nostr.py

@@ -0,0 +1,64 @@
+from binascii import hexlify
+from embit import bip32, bech32
+from embit import ec
+from seedsigner.models.seed import Seed
+
+
+NOSTR__PUBKEY_NPUB = "npub"
+NOSTR__PUBKEY_HEX = "pubhex"
+NOSTR__PRIVKEY_NSEC = "nsec"
+NOSTR__PRIVKEY_HEX = "privhex"
+
+
+def derive_nostr_key(seed: Seed) -> bip32.HDKey:
+    """ Derive the NIP-06 Nostr key at m/44'/1237'/0'/0/0
+
+        Note: NIP-06 mentions the possibility of deriving sibling seeds by incrementing
+        `account` (i.e. m/44'/1237'/<account>'/0/0) from the same root Seed, but for now
+        we only support the simplest (`account == 0`) use case.
+    """
+    root = bip32.HDKey.from_seed(seed.seed_bytes)
+    return root.derive("m/44h/1237h/0h/0/0")
+
+
+
+def get_nsec(seed: Seed) -> str:
+    nostr_root = derive_nostr_key(seed=seed)
+    converted_bits = bech32.convertbits(nostr_root.secret, 8, 5)
+    return bech32.bech32_encode(encoding=bech32.Encoding.BECH32, hrp=NOSTR__PRIVKEY_NSEC, data=converted_bits)
+
+
+
+def get_npub(seed: Seed) -> str:
+    nostr_root = derive_nostr_key(seed=seed)
+    privkey = ec.PrivateKey(secret=nostr_root.secret)
+    pubkey = privkey.get_public_key().xonly()
+    converted_bits = bech32.convertbits(pubkey, 8, 5)
+    return bech32.bech32_encode(encoding=bech32.Encoding.BECH32, hrp=NOSTR__PUBKEY_NPUB, data=converted_bits)
+
+
+
+def get_pubkey_hex(seed: Seed) -> str:
+    nostr_root = derive_nostr_key(seed=seed)
+    privkey = ec.PrivateKey(secret=nostr_root.secret)
+    return hexlify(privkey.get_public_key().xonly()).decode()
+
+
+
+def get_privkey_hex(seed: Seed) -> str:
+    nostr_root = derive_nostr_key(seed=seed)
+    return hexlify(nostr_root.secret).decode()
+
+
+
+def get_nostr_key(seed: Seed, format: str = NOSTR__PUBKEY_NPUB) -> str:
+    if format == NOSTR__PUBKEY_NPUB:
+        return get_npub(seed)
+    elif format == NOSTR__PUBKEY_HEX:
+        return get_pubkey_hex(seed)
+    elif format == NOSTR__PRIVKEY_NSEC:
+        return get_nsec(seed)
+    elif format == NOSTR__PRIVKEY_HEX:
+        return get_privkey_hex(seed)
+    else:
+        raise ValueError(f"Invalid format: {format}")

src/seedsigner/models/settings_definition.py

@@ -330,6 +330,7 @@ def map_network_to_embit(cls, network) -> str:
     SETTING__CAMERA_ROTATION = "camera_rotation"
     SETTING__COMPACT_SEEDQR = "compact_seedqr"
     SETTING__BIP85_CHILD_SEEDS = "bip85_child_seeds"
+    SETTING__NOSTR_NIP06_EXPORT = "nostr_nip06_export"
     SETTING__ELECTRUM_SEEDS = "electrum_seeds"
     SETTING__MESSAGE_SIGNING = "message_signing"
     SETTING__PRIVACY_WARNINGS = "privacy_warnings"
@@ -640,6 +641,14 @@ class SettingsDefinition:
                       visibility=SettingsConstants.VISIBILITY__ADVANCED,
                       default_value=SettingsConstants.OPTION__DISABLED),
 
+        SettingsEntry(category=SettingsConstants.CATEGORY__FEATURES,
+                      attr_name=SettingsConstants.SETTING__NOSTR_NIP06_EXPORT,
+                      abbreviated_name="nip06",
+                      display_name=_mft("Nostr NIP-06 keys"),
+                      help_text=_mft("Derive Nostr key from BIP-39 mnemonic"),
+                      visibility=SettingsConstants.VISIBILITY__ADVANCED,
+                      default_value=SettingsConstants.OPTION__DISABLED),
+
         SettingsEntry(category=SettingsConstants.CATEGORY__FEATURES,
                       attr_name=SettingsConstants.SETTING__ELECTRUM_SEEDS,
                       abbreviated_name="electrum",