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README.md
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# TREZOR Core
![TREZOR Core](docs/trezor_core.png)
[![Build Status](https://travis-ci.org/trezor/trezor-core.svg?branch=master)](https://travis-ci.org/trezor/trezor-core) [![gitter](https://badges.gitter.im/trezor/community.svg)](https://gitter.im/trezor/community)
This is the core of the upcoming TREZOR v2. It consists of several parts:
This is the core of the upcoming TREZOR v2.
* patched version of [MicroPython](https://github.com/micropython/micropython) - in `vendor/micropython`
* application logic - in `src`
##Documentation
## Documentation
* [Documentation](docs/)
##Build instructions for emulator
## Build instructions for emulator
###Linux
### Linux
####Debian/Ubuntu
#### Debian/Ubuntu
```
```sh
sudo dpkg --add-architecture i386
sudo apt-get update
sudo apt-get install libsdl2-dev:i386 libsdl2-image-dev:i386
make build_unix
```
####Fedora
#### Fedora
```
```sh
sudo yum install SDL2-devel.i686 SDL2_image-devel.i686
make build_unix
```
####openSUSE
#### openSUSE
```
```sh
sudo zypper install libSDL2-devel-32bit libSDL2_image-devel-32bit
make build_unix
```
###OS X
### OS X
```
```sh
brew install --universal sdl2 sdl2_image
make build_unix
```
@ -49,20 +48,21 @@ make build_unix
Not supported yet ...
##Build instructions for ARM
## Build instructions for ARM
###Linux
### Linux
For flashing firmware to blank device (without bootloader) by `make flash`, please install [stlink](https://github.com/texane/stlink)
For flashing firmware to blank device (without bootloader) by `make flash`,
please install [stlink](https://github.com/texane/stlink).
####Debian/Ubuntu
#### Debian/Ubuntu
```
```sh
sudo apt-get install gcc-arm-none-eabi libnewlib-arm-none-eabi
make build_trezorhal
```
###OS X
### OS X
1. Download [gcc-arm-none-eabi](https://launchpad.net/gcc-arm-embedded/5.0/5-2016-q3-update/)
2. Follow the [install instructions](https://launchpadlibrarian.net/287100883/readme.txt)

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#TREZOR Core documentation
# TREZOR Core documentation
* [TREZOR Core API](api.md)
* [TREZOR Core Bootloader](bootloader.md)

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#TREZOR Core API
# TREZOR Core API
Syntax used below is a valid Python function declaration with type hints defined in [PEP 0484](https://www.python.org/dev/peps/pep-0484/).
Syntax used below is a valid Python function declaration with type hints
defined in [PEP 0484](https://www.python.org/dev/peps/pep-0484/).

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docs/bootloader.md
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#TREZOR Core Bootloader
# TREZOR Core Bootloader
Bootloader is split into two stages. See [Memory Layout](memory.md) for info about in which sectors each stage is stored.
First stage is stored in write-protected area, which means it is non-upgradable. Only second stage bootloader update is allowed.
##First Stage Bootloader
## First Stage Bootloader
First stage checks the integrity and signatures of the second stage and runs it if everything is OK.
If first stage bootloader finds a valid second stage bootloader image on the SD card (in raw format, no filesystem),
it will replace the internal second stage, allowing a second stage update via SD card.
##Second Stage Bootloader
## Second Stage Bootloader
Second stage checks the integrity and signatures of the firmware and runs it if everything is OK.
If second stage bootloader detects a pressed finger on the display or there is no firmware loaded in the device,
it will start in a firmware update mode, allowing a firmware update via USB.
##Common notes
## Common notes
* Hash function used below is SHA-256 and signature system is Ed25519 (allows combining signatures by multiple keys into one).
* All multibyte integer values are little endian.
* There is a tool called [firmwarectl](../tools/firmwarectl) which checks validity of the bootloader/firmware images including their headers.
##Bootloader Format
## Bootloader Format
TREZOR Core (second stage) bootloader consists of 2 parts:
1. bootloader header
2. bootloader code
###Bootloader Header
### Bootloader Header
Total length of bootloader header is always 256 bytes.
@ -50,7 +49,7 @@ Total length of bootloader header is always 256 bytes.
| 0x00BF | 1 | sigidx | SatoshiLabs signature indexes (bitmap) |
| 0x00C0 | 64 | sig | SatoshiLabs signature |
##Firmware Format
## Firmware Format
TREZOR Core firmware consists of 3 parts:
@ -58,7 +57,7 @@ TREZOR Core firmware consists of 3 parts:
2. firmware header
3. firmware code
###Vendor Header
### Vendor Header
Total length of vendor header is 84 + 32 * (number of pubkeys) + (length of vendor string) + (length of vendor image) bytes rounded up to the closest multiply of 256 bytes.
@ -81,7 +80,7 @@ Total length of vendor header is 84 + 32 * (number of pubkeys) + (length of vend
| ? | 1 | sigidx | SatoshiLabs signature indexes (bitmap) |
| ? | 64 | sig | SatoshiLabs signature |
###Firmware Header
### Firmware Header
Total length of firmware header is always 256 bytes.
@ -99,7 +98,7 @@ Total length of firmware header is always 256 bytes.
| 0x00BF | 1 | sigidx | vendor signature indexes (bitmap) |
| 0x00C0 | 64 | sig | vendor signature |
##Various ideas
## Various ideas
* Bootloader should be able to read vendor+firmware header and send info about FW to client in features message.
* Bootloader should not try to run firmware if there is not any.

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#Memory Layout
# Memory Layout
##Flash
## Flash
| sector | range | size | function
|-----------|-------------------------|--------:|----------------------
@ -17,7 +17,7 @@
| Sector 10 | 0x080C0000 - 0x080DFFFF | 128 KiB | firmware
| Sector 11 | 0x080E0000 - 0x080FFFFF | 128 KiB | firmware
##RAM
## RAM
| region | range | size | function
|---------|-------------------------|--------:|----------------------

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#TREZOR Optimized Image Format
# TREZOR Optimized Image Format
All multibyte integer values are little endian!
##Header
## Header
| offset | length | name | description |
|-------:|-------:|------|-------------|
@ -13,14 +13,14 @@ All multibyte integer values are little endian!
| 0x0008 | 4 | datasize | length of the compressed data |
| 0x000A | ? | data | compressed data (see below) |
##Format
## Format
TOI currently supports 2 variants:
* `f`: full-color, file extension `.toif`
* `g`: gray-scale, file extension `.toig`
###Full-color
### Full-color
For each pixel a 16-bit value is used. First 5 bits are used for red component, next 6 bits are green, final 5 bits are blue, so it looks like this:
@ -28,7 +28,7 @@ For each pixel a 16-bit value is used. First 5 bits are used for red component,
|----|----|----|----|----|----|---|---|---|---|---|---|---|---|---|---|
| R | R | R | R | R | G | G | G | G | G | G | B | B | B | B | B |
###Gray-scale
### Gray-scale
Each pixel is encoded using a 4-bit value. Each byte contains color of two pixels, so it looks like this:
@ -38,17 +38,17 @@ Each pixel is encoded using a 4-bit value. Each byte contains color of two pixel
Where Po is odd pixel and Pe is even pixel.
##Compression
## Compression
Pixel data is compressed using DEFLATE algorithm with 10-bit sliding window and no header. This can be achieved with ZLIB library by using the following:
``` python
```python
import zlib
z = zlib.compressobj(level=9, wbits=10)
zdata = z.compress(pixeldata) + z.flush()
zdata = zdata[2:-4] # strip header and checksum
```
##Tools
## Tools
* [png2toi](../tools/png2toi) - tool for converting PNG into TOI format