mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-09 17:10:17 +00:00
82 lines
3.2 KiB
Markdown
82 lines
3.2 KiB
Markdown
# Reproducible build
|
|
|
|
We want to invite the wider community to participate in the verification of
|
|
the firmware built by SatoshiLabs. With reasonable effort you should be able to
|
|
build the firmware and verify that it's identical to the official firmware.
|
|
|
|
Trezor Firmware uses [Nix](https://nixos.org/), [Poetry](https://python-poetry.org/)
|
|
and [Cargo](https://doc.rust-lang.org/cargo/) to make the build environment
|
|
deterministic. We also provide a Docker-based script so that the build can be
|
|
performed with a single command on usual x86 Linux system.
|
|
|
|
## Building
|
|
|
|
First you need to determine which *version tag* you want to build:
|
|
* for Trezor One it is `legacy/vX.Y.Z`, e.g. `legacy/v1.10.3`,
|
|
* for Trezor Model T it is `core/vX.Y.Z`, e.g. `core/v2.4.2`.
|
|
|
|
Assuming you want to build `core/v2.4.2`:
|
|
|
|
1. install [Docker](https://www.docker.com/)
|
|
2. clone the firmware repository: `git clone https://github.com/trezor/trezor-firmware.git`
|
|
3. go into the firmware directory: `cd trezor-firmware`
|
|
4. checkout the version tag: `git checkout core/v2.4.2`
|
|
5. run: `bash build-docker.sh core/v2.4.2`
|
|
|
|
After the build finishes the firmware images are located in:
|
|
* `build/legacy/firmware/firmware.bin` and `build/legacy-bitcoinonly/firmware/firmware.bin` for Trezor One,
|
|
* `build/core/firmware/firmware.bin` and `build/core-bitcoinonly/firmware/firmware.bin` for Trezor Model T.
|
|
|
|
## Verifying
|
|
|
|
The result won't be bit-by-bit identical with the official images because the
|
|
official images are signed while local builds aren't. Official release of
|
|
Trezor One firmware also has additional 256-byte legacy header that needs to be
|
|
removed first.
|
|
|
|
### Trezor T
|
|
|
|
The [firmware header](../hardware/model-t/boot.md#firmware-header) contains 65
|
|
bytes of signature data at offset 0x15bf. After overwriting it by zeros in
|
|
official release the binaries should become identical.
|
|
|
|
```
|
|
wget https://data.trezor.io/firmware/2/trezor-2.4.2.bin
|
|
|
|
# the following line removes 65 bytes of signature data from the official firmware
|
|
dd if=/dev/zero of=trezor-2.4.2.bin bs=1 seek=5567 count=65 conv=notrunc
|
|
|
|
# the following two lines print out the hashes of the firmwares
|
|
sha256sum trezor-2.4.2.bin
|
|
sha256sum build/core/firmware/firmware.bin
|
|
```
|
|
|
|
### Trezor One
|
|
|
|
Official T1 firmware starts with [256-byte legacy header](../hardware/model-one/firmware-format.md)
|
|
used for compatibility with old bootloaders. Locally built firmware doesn't have this header.
|
|
|
|
```
|
|
wget https://data.trezor.io/firmware/1/trezor-1.10.3.bin
|
|
|
|
# strip legacy header
|
|
tail -c +257 trezor-1.10.3.bin > trezor-1.10.3-nolegacyhdr.bin
|
|
```
|
|
|
|
The [v2 header](../hardware/model-one/firmware-format.md#v2-header) has 3x65
|
|
bytes of signature data at offset 0x220. Overwrite by zeros to obtain image
|
|
identical to the one built locally.
|
|
|
|
```
|
|
dd if=/dev/zero of=trezor-1.10.3-nolegacyhdr.bin bs=1 seek=544 count=195 conv=notrunc
|
|
|
|
sha256sum trezor-1.10.3-nolegacyhdr.bin
|
|
sha256sum build/legacy/firmware/firmware.bin
|
|
```
|
|
|
|
_Note: Fingerprints displayed for T1 at the end of `build-docker.sh` do not match fingerprints of
|
|
official firmware due to the legacy header._
|
|
|
|
_Note: T1 firmware built this way won't boot because unsigned firmware needs to be built with
|
|
[`PRODUCTION=0`](../legacy/index.md#combining-bootloader-and-firmware-with-various-production-settings-signedunsigned)._
|