BIP66

A simple Bitcoin BIP66 Implementation in C++ for the ARK Ecosystem.

ANS.1 DER Encoder/Decoder based on Bitcoin BIP66.

• Supported Platforms
• Installation
  • Arduino IDE
  • PlatformIO
  • CMake
• Usage
  • Encoding a Signature
  • Decoding a Signature
  • Checking an Encoded Signature
• License

Supported Platforms

OS:	Supported:
Linux	✅
macOS	✅
Windows	✅

Environment:	Supported:
Arduino IDE	✅
PlatformIO	✅

Board:	Supported:
ESP8266	✅
ESP32	✅
ESP32-S2	✅

Installation

Arduino IDE

Download BIP66 from the Arduino IDE Library manager.
You can also copy this repo to the Arduino Libraries directory.
(e.g. ~/Documents/Arduino/libraries)

1. Open the BIP66.ino sketch in the examples/BIP66 folder.
2. Select your board from the Arduino IDE
3. Upload the sketch.

---

PlatformIO

Building BIP66 with PIO

pio run

Building BIP66 and Tests with PIO

pio run -t test/

Flashing and Running Tests with PIO

pio run -t test/ -e esp32 -t upload

---

CMake

Operating System builds like Linux, macOS, and Windows use CMake.
This build should be done out of source.

Building BIP66 with CMake

1. mkdir build && cd build
2. cmake ..
3. cmake --build .

Building BIP66 and Tests with CMake

1. mkdir build && cd build
2. cmake -DUNIT_TEST=ON ..
3. cmake --build .

Running BIP66 Tests with CMake

./test/bip66_tests

---

Usage

Encoding a Signature

From the raw R & S elements:

uint8_t r[32] = {
    33, 112, 79, 42, 219, 46, 74, 16, 163, 221, 193, 215, 214, 69, 82, 184, 6, 28, 5, 246, 209, 42, 22, 140, 105, 9, 28, 117, 88, 29, 97, 20
};

uint8_t s[32] = {
    14, 223, 55, 104, 157, 39, 134, 252, 105, 10, 249, 240, 246, 250, 31, 98, 156, 149, 105, 80, 57, 246, 72, 166, 212, 85, 72, 67, 2, 64, 46, 147
};

uint8_t signature[72];

const bool success = bip66::encode(r, 32, s, 32, signature);

---

Decoding a Signature

From a DER-encoded signature to raw R & S elements:

uint8_t derEncodedSignature[70] = {
    48, 68, 2, 32, 33, 112, 79, 42, 219, 46, 74, 16, 163, 221, 193, 215, 214, 69, 82, 184, 6, 28, 5, 246, 209, 42, 22, 140, 105, 9, 28, 117, 88, 29, 97, 20, 2, 32, 14, 223, 55, 104, 157, 39, 134, 252, 105, 10, 249, 240, 246, 250, 31, 98, 156, 149, 105, 80, 57, 246, 72, 166, 212, 85, 72, 67, 2, 64, 46, 147
};

uint8_t r[32];
uint8_t s[32];

const bool success = bip66::decode(derEncodedSignature, 70, r, s);

---

Checking an Encoded Signature

From a DER-encoded signature:

const uint8_t derEncodedSignature[70] = {
    48, 68, 2, 32, 33, 112, 79, 42, 219, 46, 74, 16, 163, 221, 193, 215, 214, 69, 82, 184, 6, 28, 5, 246, 209, 42, 22, 140, 105, 9, 28, 117, 88, 29, 97, 20, 2, 32, 14, 223, 55, 104, 157, 39, 134, 252, 105, 10, 249, 240, 246, 250, 31, 98, 156, 149, 105, 80, 57, 246, 72, 166, 212, 85, 72, 67, 2, 64, 46, 147
};

const bool success = bip66::check(derEncodedSignature, 70);

---

License

MIT © Simon Downey