Low 36 Bitcoin Committed Jul 27, 2026 · 17:01 UTC
feat(core): support EIP-7702 authorization/revocation

0cd72f03 View source ↗
Public commit record
What the developer wrote

Authored by Roman Zeyde
98/100 · Strong
feat(core): support EIP-7702 authorization/revocation

Figma: https://www.figma.com/design/3wF1eh3Ftj0XGX7wFmev8t/EIP-7702?node-id=6358-2421&t=vo7F599zB7Cp9K5D-0

Changelog entry has been updated in a previous commit.

[no changelog]
✓ Specific, descriptive subject✓ Names a concrete action or component✓ Uses a recognizable type or scope✓ Provides detailed explanatory context✓ Links an issue, advisory, or supporting reference✓ Names security-relevant behavior explicitly
The short version
What changed, and why it matters

This commit adds support for signing Ethereum EIP-7702 authorizations and revocations on Trezor hardware wallets. EIP-7702 lets an Ethereum account temporarily delegate control to a smart contract. The code adds a new signing workflow, user confirmation screens, and command-line support. It is a feature addition, not a fix for a known vulnerability. The main security consideration is that authorizing delegation is a powerful operation, so the code requires users to disable strict safety checks and confirm on the device, while revocation remains allowed under strict checks.
Recommended action
Review the EIP-7702 signature construction against the final EIP-7702 specification to ensure the magic byte 0x05 and RLP encoding match the standard. Verify that the delegate allowlist and strict-safety-check gating provide the intended risk mitigation. Confirm that the new message type is properly gated by experimental-features and that UI strings clearly warn users about account delegation. No immediate patch is indicated by the diff alone.
Security signals we found

New cryptographic signing path for EIP-7702 authorization tuples
Hard-coded delegate allowlist restricts authorization to known contracts
Strict safety checks block authorization but allow revocation
Nonce upper bound check (>= 0xFFFFFFFFFFFFFFFF rejected)
User must confirm delegation/revocation on-device before signing
No changelog entry in this commit; prior commit updated changelog
Technical analysis
Evidence from the diff

The commit introduces a new message handler EthereumSignAuth7702 wired to apps.ethereum.sign_auth_eip7702. It validates the BIP-32 path, rejects nonces >= 2^64-1, and distinguishes revocation (delegate == 0x00..00) from authorization. Revocation is permitted with strict safety checks; authorization requires safety_checks.is_strict() to be false and the delegate address to be in a hard-coded allowlist (Ambire, MetaMask). It then computes keccak256(0x05 || rlp([chain_id, delegate, nonce])) and signs with secp256k1 using the canonical Ethereum signature scheme. UI confirmation flows are added for four layout themes (bolt, caesar, delizia, eckhart). Python client and CLI support are added, plus test fixtures and UI test hashes. No CVE, advisory, or vendor security disclosure is present in the provided materials.
Changed components

core/src/apps/ethereum/sign_auth_eip7702.pycore/src/apps/ethereum/sc_constants.pycore/src/apps/workflow_handlers.pycore/src/trezor/ui/layouts/bolt/__init__.pycore/src/trezor/ui/layouts/caesar/__init__.pycore/src/trezor/ui/layouts/delizia/__init__.pycore/src/trezor/ui/layouts/eckhart/__init__.pypython/src/trezorlib/ethereum.pypython/src/trezorlib/cli/ethereum.py
Inspect captured patch +1130 / −0
diff --git a/common/tests/fixtures/ethereum/sign_auth_eip7702.json b/common/tests/fixtures/ethereum/sign_auth_eip7702.json
index 7852dd63..998e8df5 100644
--- a/common/tests/fixtures/ethereum/sign_auth_eip7702.json
+++ b/common/tests/fixtures/ethereum/sign_auth_eip7702.json
@@ -18,6 +18,20 @@
                 "sig_s": "2c705977a6e066f807d9c2aa1fba02a32069bd92d2edf2c440533f0e05592d46"
             }
         },
+        {
+            "name": "metamask_nonce_1_chainid_0_all_networks",
+            "parameters": {
+                "path": "m/44'/60'/0'/0/0",
+                "delegate": "0x63c0c19a282a1b52b07dd5a65b58948a07dae32b",
+                "nonce": 1,
+                "chain_id": 0
+            },
+            "result": {
+                "sig_v": 1,
+                "sig_r": "9092db9dd37e92acd62299cfe9610f911401029dbe24a7ccb4dd725790794c2e",
+                "sig_s": "265486929f9094a3fd11bd19eac17d027925632e68d1047ba8737b972da783bc"
+            }
+        },
         {
             "name": "ambire_nonce_1_chainid_1_mainnet",
             "parameters": {
@@ -32,6 +46,35 @@
                 "sig_s": "7938228fd841d148463bb080ace6a580309dbf94a165b3c885db984609123ffd"
             }
         },
+        {
+            "name": "metamask_nonce_1_chainid_1_mainnet",
+            "parameters": {
+                "path": "m/44'/60'/0'/0/0",
+                "delegate": "0x63c0c19a282a1b52b07dd5a65b58948a07dae32b",
+                "nonce": 1,
+                "chain_id": 1
+            },
+            "result": {
+                "sig_v": 0,
+                "sig_r": "c9d939488d895963635118cdb92d4956370e8ee8ce3a3180dcce66057f365dae",
+                "sig_s": "694b9ddb1caf5c2bee62fedd557a02a744da1e4cc32c0dcd3a0e7532cf5f546e"
+            }
+        },
+        {
+            "name": "metamask_nonce_1_chainid_200901_unknown",
+            "parameters": {
+                "path": "m/44'/60'/0'/0/0",
+                "delegate": "0x63c0c19a282a1b52b07dd5a65b58948a07dae32b",
+                "nonce": 1,
+                "chain_id": 200901,
+                "fake_defs": false
+            },
+            "result": {
+                "sig_v": 0,
+                "sig_r": "e225efdf988dd90234db63c653a9404b8d74e9ba79335e4d690c879f140cc81d",
+                "sig_s": "082031ed702504345e74f238e8a56d66438c911ce6e1089c6bcd87d9056c3304"
+            }
+        },
         {
             "name": "ambire_nonce_3_chainid_8453_base",
             "parameters": {
@@ -60,6 +103,20 @@
                 "sig_s": "60070f26d933a49b15db5b46d1443b92ff87916ea9eca9c9b6f36788ce181106"
             }
         },
+        {
+            "name": "ambire_nonce_2_chainid_123456789_defs",
+            "parameters": {
+                "path": "m/44'/60'/0'/0/0",
+                "delegate": "0x5A7fC11397E9A8AD41Bf10bF13f22b0A63F96f6D",
+                "nonce": 2,
+                "chain_id": 123456789
+            },
+            "result": {
+                "sig_v": 0,
+                "sig_r": "4bd2cf05222f0fdfd1db9f7b83b3dad612dd1060fd091a32b66c423952b7f8d7",
+                "sig_s": "16fd7587e55b3b1c412f74597fb4ffba4fa4dd7d877fb91407ac12749d26f16b"
+            }
+        },
         {
             "name": "revoke_nonce_123456_chainid_0_all_networks",
             "parameters": {
@@ -115,6 +172,20 @@
                 "sig_r": "092e59d6486520ea8fdcb1f4639fc8d3c02273f7f84bc83a527fbb9a95b8c70d",
                 "sig_s": "3a384fd28a3044fadf937511c795f50e1adeec94118a51dfab42b478a0bf860c"
             }
+        },
+        {
+            "name": "revoke_nonce_0_chainid_123456789_defs",
+            "parameters": {
+                "path": "m/44'/60'/0'/0/0",
+                "delegate": "0x0000000000000000000000000000000000000000",
+                "nonce": 0,
+                "chain_id": 123456789
+            },
+            "result": {
+                "sig_v": 1,
+                "sig_r": "dbfcec89e34039831441c02101e0ee217da668efb6d37ab4c35c0aa3454865a0",
+                "sig_s": "1ec4a7afcb7b36a84a4ae37d7ac2ae7e5bfd06868e04847be6f3882603dc83f7"
+            }
         }
     ]
 }
diff --git a/common/tests/fixtures/ethereum/sign_auth_eip7702_errors.json b/common/tests/fixtures/ethereum/sign_auth_eip7702_errors.json
new file mode 100644
index 00000000..4c389fad
--- /dev/null
+++ b/common/tests/fixtures/ethereum/sign_auth_eip7702_errors.json
@@ -0,0 +1,32 @@
+{
+    "setup": {
+        "mnemonic": "all all all all all all all all all all all all",
+        "passphrase": ""
+    },
+    "tests": [
+        {
+            "name": "unknown_nonce_123456_chainid_1_mainnet",
+            "parameters": {
+                "path": "m/44'/60'/0'/0/0",
+                "delegate": "0x4Cd241E8d1510e30b2076397afc7508Ae59C66c9",
+                "nonce": 123456,
+                "chain_id": 1
+            },
+            "result": {
+                "error": "DataError: Unknown EIP-7702 delegate address"
+            }
+        },
+        {
+            "name": "metamask_invalid_nonce_chainid_1_mainnet",
+            "parameters": {
+                "path": "m/44'/60'/0'/0/0",
+                "delegate": "0x63c0c19a282a1b52b07dd5a65b58948a07dae32b",
+                "nonce": 18446744073709551615,
+                "chain_id": 1
+            },
+            "result": {
+                "error": "DataError: Invalid nonce"
+            }
+        }
+    ]
+}
diff --git a/core/embed/upymod/qstrdefsport.h b/core/embed/upymod/qstrdefsport.h
index 49277342..dc6d83ea 100644
--- a/core/embed/upymod/qstrdefsport.h
+++ b/core/embed/upymod/qstrdefsport.h
@@ -553,6 +553,7 @@ Q(apps.ethereum.keychain)
 Q(apps.ethereum.layout)
 Q(apps.ethereum.networks)
 Q(apps.ethereum.sc_constants)
+Q(apps.ethereum.sign_auth_eip7702)
 Q(apps.ethereum.sign_message)
 Q(apps.ethereum.sign_tx)
 Q(apps.ethereum.sign_tx_eip1559)
@@ -769,6 +770,7 @@ Q(sc_constants)
 Q(seed)
 Q(serialize)
 Q(serialize_messages)
+Q(sign_auth_eip7702)
 Q(sign_message)
 Q(sign_tx)
 Q(sign_tx_eip1559)
diff --git a/core/src/apps/ethereum/sc_constants.py b/core/src/apps/ethereum/sc_constants.py
index 9aa49766..2923eef8 100644
--- a/core/src/apps/ethereum/sc_constants.py
+++ b/core/src/apps/ethereum/sc_constants.py
@@ -71,3 +71,11 @@ def weth_deployments() -> Iterator[tuple[int, bytes]]:
     yield (8453, b"\x42\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x06")
     yield (11155111, b"\x7b\x79\x99\x5e\x5f\x79\x3a\x07\xbc\x00\xc2\x14\x12\xe5\x0e\xca\xe0\x98\xe7\xf9")
     yield (17000, b"\x94\x37\x3a\x49\x19\xb3\x24\x0d\x86\xea\x41\x59\x3d\x5e\xba\x78\x9f\xef\x38\x48")
+
+
+def lookup_eip7702_address(address: bytes) -> str | None:
+    if address == b"\x5a\x7f\xc1\x13\x97\xe9\xa8\xad\x41\xbf\x10\xbf\x13\xf2\x2b\x0a\x63\xf9\x6f\x6d":
+        return "Ambire"
+    if address == b"\x63\xc0\xc1\x9a\x28\x2a\x1b\x52\xb0\x7d\xd5\xa6\x5b\x58\x94\x8a\x07\xda\xe3\x2b":
+        return "MetaMask"
+    return None
diff --git a/core/src/apps/ethereum/sc_constants.py.mako b/core/src/apps/ethereum/sc_constants.py.mako
index 281423fe..75839b19 100644
--- a/core/src/apps/ethereum/sc_constants.py.mako
+++ b/core/src/apps/ethereum/sc_constants.py.mako
@@ -145,3 +145,18 @@ def weth_deployments() -> Iterator[tuple[int, bytes]]:
 % for chain_id, addr in WETH_DEPLOYMENTS:
     yield (${chain_id}, ${fmt_addr(addr)})
 % endfor
+
+<%
+_EIP7702_ADDRESSES = [
+    # https://etherscan.io/address/0x5a7fc11397e9a8ad41bf10bf13f22b0a63f96f6d
+    ("5a7fc11397e9a8ad41bf10bf13f22b0a63f96f6d", "Ambire"),
+    # https://etherscan.io/address/0x63c0c19a282a1b52b07dd5a65b58948a07dae32b
+    ("63c0c19a282a1b52b07dd5a65b58948a07dae32b", "MetaMask"),
+]
+%>
+def lookup_eip7702_address(address: bytes) -> str | None:
+% for addr, name in _EIP7702_ADDRESSES:
+    if address == ${fmt_addr(addr)}:
+        return "${name}"
+% endfor
+    return None
diff --git a/core/src/apps/ethereum/sign_auth_eip7702.py b/core/src/apps/ethereum/sign_auth_eip7702.py
new file mode 100644
index 00000000..6113ab05
--- /dev/null
+++ b/core/src/apps/ethereum/sign_auth_eip7702.py
@@ -0,0 +1,118 @@
+from typing import TYPE_CHECKING
+
+from trezor import TR
+from trezor.crypto.curve import secp256k1
+from trezor.messages import EthereumAuth7702Signature
+from trezor.wire import DataError, ProcessError
+
+from .keychain import with_keychain_from_chain_id
+from .networks import UNKNOWN_NETWORK
+from .sc_constants import lookup_eip7702_address
+
+if TYPE_CHECKING:
+    from trezor.messages import EthereumSignAuth7702
+
+    from apps.common.keychain import Keychain
+
+    from .definitions import Definitions
+
+_MAGIC = b"\x05"
+
+_REVOKE_ADDRESS = b"\x00" * 20
+
+
+@with_keychain_from_chain_id
+async def sign_auth_eip7702(
+    msg: EthereumSignAuth7702,
+    keychain: Keychain,
+    defs: Definitions,
+) -> EthereumAuth7702Signature:
+
+    from trezor.crypto import rlp
+    from trezor.ui.layouts import (
+        confirm_ethereum_eip7702_auth,
+        confirm_ethereum_eip7702_revoke,
+        show_continue_in_app,
+    )
+
+    from apps.common import paths, safety_checks
+
+    from .helpers import bytes_from_address, get_account_and_path, keccak256
+
+    await paths.validate_path(keychain, msg.address_n)
+
+    chain_id = msg.chain_id
+    if chain_id == 0:
+        # special marker making signature valid for all chains
+        network_item = (TR.ethereum__network, TR.ethereum__all_evms, None)
+    else:
+        if defs.network is UNKNOWN_NETWORK:
+            network_item = (
+                TR.ethereum__approve_chain_id,
+                f"{chain_id} (0x{chain_id:x})",
+                None,
+            )
+        else:
+            network_item = (TR.ethereum__network, defs.network.name, None)
+
+    account, account_path = get_account_and_path(msg.address_n)
+    if account is None or account_path is None:
+        raise DataError("Unknown account")
+
+    if msg.nonce >= 0xFFFFFFFFFFFFFFFF:
+        raise DataError("Invalid nonce")
+
+    delegate_bytes = bytes_from_address(msg.delegate)
+    if delegate_bytes == _REVOKE_ADDRESS:
+        # revocation can be done with strict safety checks
+        await confirm_ethereum_eip7702_revoke(
+            network_item=network_item,
+            account=account,
+            account_path=account_path,
+            nonce=msg.nonce,
+        )
+        done_msg = TR.ethereum__revoke_done
+    else:
+        if safety_checks.is_strict():
+            raise ProcessError(
+                "EIP-7702 authorisation not allowed with strict safety checks"
+            )
+
+        delegate_name = lookup_eip7702_address(delegate_bytes)
+        if delegate_name is None:
+            raise DataError("Unknown EIP-7702 delegate address")
+
+        await confirm_ethereum_eip7702_auth(
+            delegate_name=delegate_name,
+            delegate_addr=msg.delegate,
+            network_item=network_item,
+            account=account,
+            account_path=account_path,
+            nonce=msg.nonce,
+        )
+        done_msg = TR.ethereum__auth_done
+
+    fields: tuple[rlp.RLPItem, ...] = (
+        msg.chain_id,
+        delegate_bytes,
+        msg.nonce,
+    )
+
+    sha = keccak256(_MAGIC)
+
+    data_length = sum(rlp.length(field) for field in fields)
+    rlp.write_header(sha, data_length, rlp.LIST_HEADER_BYTE)
+    for field in fields:
+        rlp.write(sha, field)
+
+    digest = sha.get_digest()
+    node = keychain.derive(msg.address_n)
+    signature = secp256k1.sign(
+        node.private_key(), digest, False, secp256k1.CANONICAL_SIG_ETHEREUM
+    )
+    show_continue_in_app(done_msg)
+    return EthereumAuth7702Signature(
+        signature_v=signature[0] - 27,
+        signature_r=signature[1:33],
+        signature_s=signature[33:],
+    )
diff --git a/core/src/apps/workflow_handlers.py b/core/src/apps/workflow_handlers.py
index 35a3b300..9d5ca859 100644
--- a/core/src/apps/workflow_handlers.py
+++ b/core/src/apps/workflow_handlers.py
@@ -157,6 +157,8 @@ def _find_message_handler_module(msg_type: int) -> str:
             return "apps.ethereum.get_address"
         if msg_type == MessageType.EthereumGetPublicKey:
             return "apps.ethereum.get_public_key"
+        if msg_type == MessageType.EthereumSignAuth7702:
+            return "apps.ethereum.sign_auth_eip7702"
         if msg_type == MessageType.EthereumSignTx:
             return "apps.ethereum.sign_tx"
         if msg_type == MessageType.EthereumSignTxEIP1559:
diff --git a/core/src/trezor/ui/layouts/bolt/__init__.py b/core/src/trezor/ui/layouts/bolt/__init__.py
index 4d206c8d..e47e3757 100644
--- a/core/src/trezor/ui/layouts/bolt/__init__.py
+++ b/core/src/trezor/ui/layouts/bolt/__init__.py
@@ -1498,6 +1498,88 @@ if not utils.BITCOIN_ONLY:
             br_code=br_code,
         )
 
+    async def confirm_ethereum_eip7702_auth(
+        delegate_name: str,
+        delegate_addr: str,
+        network_item: StrPropertyType,
+        account: str,
+        account_path: str,
+        nonce: int,
+    ) -> None:
+        with trezorui_api.show_warning(
+            title=TR.words__warning,
+            button=TR.buttons__confirm,
+            description=TR.ethereum__auth_warn,
+            allow_cancel=True,
+            danger=True,
+        ) as layout:
+            await raise_if_not_confirmed(layout, "ethereum/auth7702/warn")
+
+        main_ctx = trezorui_api.confirm_properties(
+            title=TR.ethereum__auth_title,
+            items=[
+                (TR.ethereum__delegating, account, False),
+                (TR.ethereum__to, delegate_name, False),
+                network_item,
+            ],
+            hold=True,
+            external_menu=True,
+        )
+        menu_ctx = trezorui_api.show_info_with_cancel(
+            title="",
+            items=[
+                (TR.words__account, account, False),
+                (TR.address_details__derivation_path, account_path, False),
+                (TR.ethereum__smart_info, delegate_addr, False),
+                # TODO: switch to non-Cardano specific string
+                (TR.cardano__nonce, str(nonce), False),
+            ],
+        )
+        with main_ctx as main, menu_ctx as menu:
+            await with_info(
+                main, menu, "ethereum/auth7702/details", ButtonRequestType.SignTx
+            )
+
+    async def confirm_ethereum_eip7702_revoke(
+        network_item: StrPropertyType,
+        account: str,
+        account_path: str,
+        nonce: int,
+    ) -> None:
+        with trezorui_api.confirm_action(
+            title=TR.ethereum__revoke_title,
+            description=None,
+            action=TR.ethereum__revoke_warn.format(account),
+            verb=TR.buttons__continue,
+        ) as layout:
+            await raise_if_not_confirmed(
+                layout, "ethereum/revoke7702/intro", ButtonRequestType.SignTx
+            )
+
+        main_ctx = trezorui_api.confirm_properties(
+            title=TR.ethereum__revoke_title,
+            items=[
+                (TR.ethereum__approve_revoke_from, account, False),
+                network_item,
+            ],
+            verb=TR.buttons__confirm,
+            hold=True,
+            external_menu=True,
+        )
+        menu_ctx = trezorui_api.show_info_with_cancel(
+            title="",
+            items=[
+                (TR.words__account, account, False),
+                (TR.address_details__derivation_path, account_path, False),
+                # TODO: switch to non-Cardano specific string
+                (TR.cardano__nonce, str(nonce), False),
+            ],
+        )
+        with main_ctx as main, menu_ctx as menu:
+            await with_info(
+                main, menu, "ethereum/revoke7702/details", ButtonRequestType.SignTx
+            )
+
     def confirm_solana_unknown_token_warning() -> Awaitable[None]:
         return show_danger(
             "unknown_token_warning", content=TR.solana__unknown_token_address
diff --git a/core/src/trezor/ui/layouts/caesar/__init__.py b/core/src/trezor/ui/layouts/caesar/__init__.py
index 80ddd528..477bbeb7 100644
--- a/core/src/trezor/ui/layouts/caesar/__init__.py
+++ b/core/src/trezor/ui/layouts/caesar/__init__.py
@@ -1481,6 +1481,103 @@ if not utils.BITCOIN_ONLY:
                 br_code=br_code,
             )
 
+    async def confirm_ethereum_eip7702_auth(
+        delegate_name: str,
+        delegate_addr: str,
+        network_item: StrPropertyType,
+        account: str,
+        account_path: str,
+        nonce: int,
+    ) -> None:
+        from trezor.ui.layouts.menu import Menu, confirm_with_menu
+
+        with trezorui_api.show_warning(
+            title=TR.words__warning,
+            button=TR.buttons__confirm,
+            description=TR.ethereum__auth_warn,
+            value=TR.words__know_what_your_doing,
+            allow_cancel=True,
+            danger=True,
+        ) as layout:
+            await raise_if_not_confirmed(layout, "ethereum/auth7702/warn")
+
+        with trezorui_api.confirm_properties(
+            title=TR.ethereum__auth_title,
+            items=[
+                (TR.ethereum__delegating, account, False),
+                (TR.ethereum__to, delegate_name, False),
+                network_item,
+            ],
+            hold=True,
+            external_menu=True,
+        ) as layout:
+            account_info = [
+                (TR.words__account, account, False),
+                (TR.address_details__derivation_path, account_path, False),
+            ]
+            more_info = [
+                (TR.ethereum__smart_info, delegate_addr, False),
+                # TODO: switch to non-Cardano specific string
+                (TR.cardano__nonce, str(nonce), False),
+            ]
+            children = [
+                create_details(TR.address_details__account_info, account_info),
+                create_details(TR.buttons__more_info, more_info),
+            ]
+            await confirm_with_menu(
+                layout,
+                Menu.root(children, cancel=TR.buttons__cancel),
+                "ethereum/auth7702/details",
+                ButtonRequestType.SignTx,
+            )
+
+    async def confirm_ethereum_eip7702_revoke(
+        network_item: StrPropertyType,
+        account: str,
+        account_path: str,
+        nonce: int,
+    ) -> None:
+        from trezor.ui.layouts.menu import Menu, confirm_with_menu
+
+        account_info = [
+            (TR.words__account, account, False),
+            (TR.address_details__derivation_path, account_path, False),
+        ]
+        menu = Menu.root(
+            children=[
+                create_details(TR.address_details__account_info, account_info),
+                # TODO: switch to non-Cardano specific string
+                create_details(TR.cardano__nonce, str(nonce)),
+            ],
+            cancel=TR.buttons__cancel,
+        )
+
+        with trezorui_api.confirm_action(
+            title=TR.words__warning,
+            description=TR.words__know_what_your_doing,
+            action=TR.ethereum__revoke_warn.format(account),
+            verb=TR.buttons__continue,
+            external_menu=True,
+            cancel=False,
+        ) as layout:
+            await confirm_with_menu(
+                layout, menu, "ethereum/revoke7702/intro", ButtonRequestType.SignTx
+            )
+
+        with trezorui_api.confirm_properties(
+            title=TR.ethereum__revoke_title,
+            items=[
+                (TR.ethereum__approve_revoke_from, account, False),
+                network_item,
+            ],
+            verb=TR.buttons__confirm,
+            hold=True,
+            external_menu=True,
+        ) as layout:
+            await confirm_with_menu(
+                layout, menu, "ethereum/revoke7702/details", ButtonRequestType.SignTx
+            )
+
     def confirm_solana_unknown_token_warning() -> Awaitable[None]:
         return show_danger(
             "unknown_token_warning",
diff --git a/core/src/trezor/ui/layouts/delizia/__init__.py b/core/src/trezor/ui/layouts/delizia/__init__.py
index 791a8fc2..78b0a3ad 100644
--- a/core/src/trezor/ui/layouts/delizia/__init__.py
+++ b/core/src/trezor/ui/layouts/delizia/__init__.py
@@ -1528,6 +1528,99 @@ if not utils.BITCOIN_ONLY:
 
         await confirm_linear_flow(_step1, _step2, _step3)
 
+    async def confirm_ethereum_eip7702_auth(
+        delegate_name: str,
+        delegate_addr: str,
+        network_item: StrPropertyType,
+        account: str,
+        account_path: str,
+        nonce: int,
+    ) -> None:
+        from trezor.ui.layouts.menu import Menu, confirm_with_menu
+
+        with trezorui_api.show_warning(
+            title=TR.words__warning,
+            button=TR.words__are_you_sure,
+            value=TR.ethereum__auth_warn,
+            allow_cancel=True,
+            danger=True,
+        ) as layout:
+            await raise_if_not_confirmed(layout, "ethereum/auth7702/warn")
+
+        with trezorui_api.confirm_properties(
+            title=TR.ethereum__auth_title,
+            items=[
+                (TR.ethereum__delegating, account, False),
+                (TR.ethereum__to, delegate_name, False),
+                network_item,
+            ],
+            hold=True,
+            external_menu=True,
+        ) as layout:
+            account_info = [
+                (TR.words__account, account, False),
+                (TR.address_details__derivation_path, account_path, False),
+            ]
+            more_info = [
+                (TR.ethereum__smart_info, delegate_addr, False),
+                (TR.cardano__nonce, str(nonce), False),
+            ]
+            children = [
+                create_details(TR.address_details__account_info, account_info),
+                create_details(TR.buttons__more_info, more_info),
+            ]
+            await confirm_with_menu(
+                layout,
+                Menu.root(children, cancel=TR.buttons__cancel),
+                "ethereum/auth7702/details",
+                ButtonRequestType.SignTx,
+            )
+
+    async def confirm_ethereum_eip7702_revoke(
+        network_item: StrPropertyType,
+        account: str,
+        account_path: str,
+        nonce: int,
+    ) -> None:
+        from trezor.ui.layouts.menu import Menu, confirm_with_menu
+
+        account_info = [
+            (TR.words__account, account, True),
+            (TR.address_details__derivation_path, account_path, True),
+        ]
+        menu = Menu.root(
+            children=[
+                create_details(TR.address_details__account_info, account_info),
+                create_details(TR.cardano__nonce, str(nonce)),
+            ],
+            cancel=TR.buttons__cancel,
+        )
+
+        with trezorui_api.confirm_action(
+            title=TR.ethereum__revoke_title,
+            description=None,
+            action=TR.ethereum__revoke_warn.format(account),
+            verb=TR.buttons__continue,
+            external_menu=True,
+            cancel=False,
+        ) as layout:
+            await confirm_with_menu(
+                layout, menu, "ethereum/revoke7702/intro", ButtonRequestType.SignTx
+            )
+
+        with trezorui_api.confirm_properties(
+            title=TR.ethereum__revoke_title,
+            items=[
+                (TR.ethereum__approve_revoke_from, account, False),
+                network_item,
+            ],
+            hold=True,
+            external_menu=True,
+        ) as layout:
+            await confirm_with_menu(
+                layout, menu, "ethereum/revoke7702/details", ButtonRequestType.SignTx
+            )
+
     def confirm_solana_unknown_token_warning() -> Awaitable[None]:
         return show_danger(
             "unknown_token_warning",
diff --git a/core/src/trezor/ui/layouts/eckhart/__init__.py b/core/src/trezor/ui/layouts/eckhart/__init__.py
index f088e267..056bff00 100644
--- a/core/src/trezor/ui/layouts/eckhart/__init__.py
+++ b/core/src/trezor/ui/layouts/eckhart/__init__.py
@@ -1520,6 +1520,102 @@ if not utils.BITCOIN_ONLY:
 
         await confirm_linear_flow(_step1, _step2, _step3)
 
+    async def confirm_ethereum_eip7702_auth(
+        delegate_name: str,
+        delegate_addr: str,
+        network_item: StrPropertyType,
+        account: str,
+        account_path: str,
+        nonce: int,
+    ) -> None:
+        from trezor.ui.layouts.menu import Menu, confirm_with_menu
+
+        with trezorui_api.show_warning(
+            title=TR.words__warning,
+            button=TR.buttons__confirm,
+            description=TR.ethereum__auth_warn,
+            value=TR.words__know_what_your_doing,
+            allow_cancel=True,
+            danger=True,
+        ) as layout:
+            await raise_if_not_confirmed(layout, "ethereum/auth7702/warn")
+
+        with trezorui_api.confirm_properties(
+            title=TR.ethereum__auth_title,
+            items=[
+                (TR.ethereum__delegating, account, False),
+                (TR.ethereum__to, delegate_name, False),
+                network_item,
+            ],
+            hold=True,
+            external_menu=True,
+        ) as layout:
+            account_info = [
+                (TR.words__account, account, False),
+                (TR.address_details__derivation_path, account_path, False),
+            ]
+            more_info = [
+                (TR.ethereum__smart_info, delegate_addr, False),
+                # TODO: switch to non-Cardano specific string
+                (TR.cardano__nonce, str(nonce), False),
+            ]
+            children = [
+                create_details(TR.address_details__account_info, account_info),
+                create_details(TR.buttons__more_info, more_info),
+            ]
+            await confirm_with_menu(
+                layout,
+                Menu.root(children, cancel=TR.buttons__cancel),
+                "ethereum/auth7702/details",
+                ButtonRequestType.SignTx,
+            )
+
+    async def confirm_ethereum_eip7702_revoke(
+        network_item: StrPropertyType,
+        account: str,
+        account_path: str,
+        nonce: int,
+    ) -> None:
+        from trezor.ui.layouts.menu import Menu, confirm_with_menu
+
+        account_info = [
+            (TR.words__account, account, False),
+            (TR.address_details__derivation_path, account_path, False),
+        ]
+        menu = Menu.root(
+            children=[
+                create_details(TR.address_details__account_info, account_info),
+                # TODO: switch to non-Cardano specific string
+                create_details(TR.cardano__nonce, str(nonce)),
+            ],
+            cancel=TR.buttons__cancel,
+        )
+
+        with trezorui_api.confirm_action(
+            title=TR.ethereum__revoke_title,
+            description=TR.words__know_what_your_doing,
+            action=TR.ethereum__revoke_warn.format(account),
+            verb=TR.buttons__continue,
+            external_menu=True,
+            cancel=False,
+        ) as layout:
+            await confirm_with_menu(
+                layout, menu, "ethereum/revoke7702/intro", ButtonRequestType.SignTx
+            )
+
+        with trezorui_api.confirm_properties(
+            title=TR.ethereum__revoke_title,
+            items=[
+                (TR.ethereum__approve_revoke_from, account, False),
+                network_item,
+            ],
+            hold=True,
+            external_menu=True,
+        ) as layout:
+            await confirm_with_menu(
+                layout, menu, "ethereum/revoke7702/details", ButtonRequestType.SignTx
+            )
+
     async def confirm_ethereum_staking_tx(
         title: str,
         intro_question: str,
diff --git a/python/src/trezorlib/cli/ethereum.py b/python/src/trezorlib/cli/ethereum.py
index 46594db3..e97c5f4c 100644
--- a/python/src/trezorlib/cli/ethereum.py
+++ b/python/src/trezorlib/cli/ethereum.py
@@ -676,3 +676,40 @@ def sign_typed_data_hash(
         "signature": f"0x{ret.signature.hex()}",
     }
     return output
+
+
+@cli.command()
+@click.option("-n", "--address", required=True, help=PATH_HELP)
+@click.option(
+    "-c", "--chain-id", type=int, default=1, help="EIP-155 chain id (replay protection)"
+)
+@click.option("-i", "--nonce", type=int, required=True, help="Transaction counter")
+@click.argument("delegate_addr")
+@with_session
+def sign_auth_eip7702(
+    session: "Session",
+    address: str,
+    chain_id: int,
+    nonce: int,
+    delegate_addr: str,
+) -> dict[str, Any]:
+    """
+    Sign EIP-7702 authorization.
+
+    If DELEGATE_ADDR is 0x0000000000000000000000000000000000000000, authorization is revoked.
+    """
+    address_n = tools.parse_path(address)
+    encoded_network = DEFINITIONS_SOURCE.get_eth_network(chain_id)
+    ret = ethereum.sign_auth_eip7702(
+        session,
+        address_n,
+        delegate=delegate_addr,
+        chain_id=chain_id,
+        nonce=nonce,
+        encoded_network=encoded_network,
+    )
+    return {
+        "v": ret.signature_v,
+        "r": f"0x{ret.signature_r.hex()}",
+        "s": f"0x{ret.signature_s.hex()}",
+    }
diff --git a/python/src/trezorlib/ethereum.py b/python/src/trezorlib/ethereum.py
index a8b017ea..0037552e 100644
--- a/python/src/trezorlib/ethereum.py
+++ b/python/src/trezorlib/ethereum.py
@@ -470,3 +470,25 @@ def sign_typed_data_hash(
         ),
         expect=messages.EthereumTypedDataSignature,
     )
+
+
+@workflow(capability=messages.Capability.Ethereum)
+def sign_auth_eip7702(
+    session: "Session",
+    n: "Address",
+    *,
+    delegate: str,
+    chain_id: int,
+    nonce: int,
+    encoded_network: Optional[bytes] = None,
+) -> messages.EthereumAuth7702Signature:
+    return session.call(
+        messages.EthereumSignAuth7702(
+            address_n=n,
+            chain_id=chain_id,
+            delegate=delegate,
+            nonce=nonce,
+            definitions=messages.EthereumDefinitions(encoded_network=encoded_network),
+        ),
+        expect=messages.EthereumAuth7702Signature,
+    )
diff --git a/tests/device_tests/ethereum/test_sign_eip7702.py b/tests/device_tests/ethereum/test_sign_eip7702.py
new file mode 100644
index 00000000..df38c3d2
--- /dev/null
+++ b/tests/device_tests/ethereum/test_sign_eip7702.py
@@ -0,0 +1,95 @@
+# This file is part of the Trezor project.
+#
+# Copyright (C) SatoshiLabs and contributors
+#
+# This library is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License version 3
+# as published by the Free Software Foundation.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the License along with this library.
+# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
+
+import pytest
+
+from trezorlib import device, ethereum
+from trezorlib.debuglink import DebugSession as Session
+from trezorlib.exceptions import TrezorFailure
+from trezorlib.messages import EthereumAuth7702Signature, SafetyCheckLevel
+from trezorlib.tools import parse_path
+
+from ...common import parametrize_using_common_fixtures
+from .test_signtx import make_defs
+
+pytestmark = [
+    pytest.mark.altcoin,
+    pytest.mark.ethereum,
+    pytest.mark.models("core", reason="T1 does not support EIP 7702"),
+]
+
+# Test vectors validated with Foundry
+# cast wallet sign-auth $ADDRESS --mnemonic $MNEMONIC --mnemonic-derivation-path "m/44'/60'/0'/0/0" --nonce $NONCE --chain $CHAINID
+# To evaluate signature parts: cast from-rlp <result_from_above>
+# format: [chain_id, address, nonce, v, r, s]
+
+
+@parametrize_using_common_fixtures("ethereum/sign_auth_eip7702.json")
+def test_sign_eip7702(session: Session, parameters, result):
+    delegate = parameters["delegate"]
+    defs = make_defs(parameters)
+
+    def _sign() -> EthereumAuth7702Signature:
+        return ethereum.sign_auth_eip7702(
+            session,
+            n=parse_path(parameters["path"]),
+            chain_id=parameters["chain_id"],
+            delegate=delegate,
+            nonce=parameters["nonce"],
+            encoded_network=defs.encoded_network,
+        )
+
+    with pytest.raises(TrezorFailure, match="Experimental features are disabled"):
+        _sign()
+
+    device.apply_settings(session, experimental_features=True)
+
+    # Revocation doesn't require disabling strict safety checks.
+    if delegate != "0x0000000000000000000000000000000000000000":
+        with pytest.raises(
+            TrezorFailure,
+            match="ProcessError: EIP-7702 authorisation not allowed with strict safety checks",
+        ):
+            _sign()
+
+        # Authorization requires disabling strict safety checks.
+        device.apply_settings(
+            session,
+            safety_checks=SafetyCheckLevel.PromptTemporarily,
+        )
+
+    res = _sign()
+    assert res.signature_v == result["sig_v"]
+    assert res.signature_r.hex() == result["sig_r"]
+    assert res.signature_s.hex() == result["sig_s"]
+
+
+@parametrize_using_common_fixtures("ethereum/sign_auth_eip7702_errors.json")
+def test_sign_eip7702_errors(session: Session, parameters, result):
+    device.apply_settings(
+        session,
+        safety_checks=SafetyCheckLevel.PromptTemporarily,
+        experimental_features=True,
+    )
+
+    with pytest.raises(TrezorFailure, match=result["error"]):
+        ethereum.sign_auth_eip7702(
+            session,
+            n=parse_path(parameters["path"]),
+            chain_id=parameters["chain_id"],
+            delegate=parameters["delegate"],
+            nonce=parameters["nonce"],
+        )
diff --git a/tests/ui_tests/fixtures.json b/tests/ui_tests/fixtures.json
index d6671428..d8dff314 100644
--- a/tests/ui_tests/fixtures.json
+++ b/tests/ui_tests/fixtures.json
@@ -2101,6 +2101,21 @@
 "T2T1_cs_ethereum-test_getpublickey.py::test_ethereum_getpublickey[parameters1-result1]": "f2b80196c81ce473b7f24f16f6192ac76d9d2ca23fb0b40053c00d02b53d5111",
 "T2T1_cs_ethereum-test_getpublickey.py::test_ethereum_getpublickey[parameters2-result2]": "f2b80196c81ce473b7f24f16f6192ac76d9d2ca23fb0b40053c00d02b53d5111",
 "T2T1_cs_ethereum-test_getpublickey.py::test_slip25_disallowed": "f2b80196c81ce473b7f24f16f6192ac76d9d2ca23fb0b40053c00d02b53d5111",
+"T2T1_cs_ethereum-test_sign_eip7702.py::test_sign_eip7702[ambire_nonce_1_chainid_0_all_networks]": "458ba1f4b96e4f622e0d489beceda38011b72faad44bd05155dc74d860faddf2",
+"T2T1_cs_ethereum-test_sign_eip7702.py::test_sign_eip7702[ambire_nonce_1_chainid_1_mainnet]": "cc39ede3aeba50f751f73f1d034b15f78a5b76327ca220fee98818e16a17cecb",
+"T2T1_cs_ethereum-test_sign_eip7702.py::test_sign_eip7702[ambire_nonce_2_chainid_123456789_defs]": "7d9cb4df914ed4c41154fc9e8a09aa9562407d49b235250529556659d2809c41",
+"T2T1_cs_ethereum-test_sign_eip7702.py::test_sign_eip7702[ambire_nonce_2_chainid_42161_arbitrum]": "801ce11b489a5b7e3c96d19c5989ab83593c142453f3ef0a4c65807666acb552",
+"T2T1_cs_ethereum-test_sign_eip7702.py::test_sign_eip7702[ambire_nonce_3_chainid_8453_base]": "0a1092e8ac484390a32232b2feb2e3f60e7c7b80100abf4450fd3d7a3901ff4c",
+"T2T1_cs_ethereum-test_sign_eip7702.py::test_sign_eip7702[metamask_nonce_1_chainid_0_all_networks]": "1437b4697226e58a6ed5c6fa957d6e99061d4321f4ff2108f741f7050e97e2d8",
+"T2T1_cs_ethereum-test_sign_eip7702.py::test_sign_eip7702[metamask_nonce_1_chainid_1_mainnet]": "bfed0f5d3708bbb739760ab2397af286c1584dafafbe6f2daf034d31e79144bc",
+"T2T1_cs_ethereum-test_sign_eip7702.py::test_sign_eip7702[metamask_nonce_1_chainid_200901_unknown]": "b99a96ad07321f804a87752b4fb260e836a216b2de21b3e15f30ed55cc1c1e8e",
+"T2T1_cs_ethereum-test_sign_eip7702.py::test_sign_eip7702[revoke_nonce_0_chainid_123456789_defs]": "8dc1f989315463b04b43a41c309b3d6aaadfd9bcb0c5795f51aadb20bb48be0d",
+"T2T1_cs_ethereum-test_sign_eip7702.py::test_sign_eip7702[revoke_nonce_123456_chainid_0_all_networks]": "bc45529ede7cf766f941a4b9cb4d52077cb5505ccc15a4da2f812ed0851f0972",
+"T2T1_cs_ethereum-test_sign_eip7702.py::test_sign_eip7702[revoke_nonce_123456_chainid_1_mainnet]": "41c63e081c0a2d5cfae1ccd33fcbab0ba01cf4cb1f809ffced3aed9c08b73629",
+"T2T1_cs_ethereum-test_sign_eip7702.py::test_sign_eip7702[revoke_nonce_123456_chainid_42161_arbitrum]": "1554edec55969bf24efa3491c8a316b245a8052b89baa0a829ad3778bb39a2e1",
+"T2T1_cs_ethereum-test_sign_eip7702.py::test_sign_eip7702[revoke_nonce_123456_chainid_8453_base]": "06f36bc3ad9ed32fb55aea6de9327fb724d4041d968102344a1540d83bd55b73",
+"T2T1_cs_ethereum-test_sign_eip7702.py::test_sign_eip7702_errors[metamask_invalid_nonce_chainid_1_mainnet]": "b4ef5fc99d433b988d8f4af980391f9f2d3a5f45a9a02662d56f9a1873796539",
+"T2T1_cs_ethereum-test_sign_eip7702.py::test_sign_eip7702_errors[unknown_nonce_123456_chainid_1_mainnet]": "b4ef5fc99d433b988d8f4af980391f9f2d3a5f45a9a02662d56f9a1873796539",
 "T2T1_cs_ethereum-test_sign_typed_data.py::test_ethereum_sign_typed_data[array_of_structs]": "58f7b6f8a490b8ed91257e81141927d12151874eb174936568e5295d1b279069",
 "T2T1_cs_ethereum-test_sign_typed_data.py::test_ethereum_sign_typed_data[bare_minimum]": "7f02d8e8494aa9b013086e8d43c41fd0d29359bc5fbae2c0fa47c64a9d4f9414",
 "T2T1_cs_ethereum-test_sign_typed_data.py::test_ethereum_sign_typed_data[basic_data]": "5f870b335fb19cfb2a7d194e98dccf9db15c551cecb42a65f1606c2177d40791",
@@ -3908,6 +3923,21 @@
 "T2T1_de_ethereum-test_getpublickey.py::test_ethereum_getpublickey[parameters1-result1]": "efeaf51fe18b983e9b1a6947a939ad305a92e57798fe07110bb61c0f65755881",
 "T2T1_de_ethereum-test_getpublickey.py::test_ethereum_getpublickey[parameters2-result2]": "efeaf51fe18b983e9b1a6947a939ad305a92e57798fe07110bb61c0f65755881",
 "T2T1_de_ethereum-test_getpublickey.py::test_slip25_disallowed": "efeaf51fe18b983e9b1a6947a939ad305a92e57798fe07110bb61c0f65755881",
+"T2T1_de_ethereum-test_sign_eip7702.py::test_sign_eip7702[ambire_nonce_1_chainid_0_all_networks]": "9b98e55bb43b52cadb33204eed1d3b029bd8a2c2c8206610ecadbb05fd1116ba",
+"T2T1_de_ethereum-test_sign_eip7702.py::test_sign_eip7702[ambire_nonce_1_chainid_1_mainnet]": "3943b5b3f15e7b20363d47838478ca5d956d56a6cc869b5b3257c680ae573757",
+"T2T1_de_ethereum-test_sign_eip7702.py::test_sign_eip7702[ambire_nonce_2_chainid_123456789_defs]": "91cb1cb3bae6ab0c95d8ccb81b62f80e84ec550dd1e277c994000c7d19d9ad2b",
+"T2T1_de_ethereum-test_sign_eip7702.py::test_sign_eip7702[ambire_nonce_2_chainid_42161_arbitrum]": "9cc2008d63122ef113f8a8cea198c444cb5712310a7fa92b00cdf8e273ff4c16",
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@@ -44505,6 +44850,21 @@
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Risk score
Why this scored 36/100

Our methodology →
Potential impact 8/30
Exploitability 6/25
Stealth signal 4/15
Affected reach 7/15
Confidence 7/10
Evidence quality 4/5
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Evidence from the diff

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Why this scored 36/100

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Related watches

fix(python/trezorlib): enable entropy check on T1 by default

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refactor(core): assorted micropython-1.28.0 fixes
