Keysmith.Net.Secp256k1 1.2.1

Keysmith.Net

Modern .NET9 library implementing common cryptographic standards used by various cryptocurrencies like BIP32/SLIP10, BIP39 and BIP44.

The intention of this library is to provide minimal no boilerplate implemenations of these cryptographic primitives while maintaining the best possible performance using the latest language features.

Installation

Base Package: Keysmith.Net

The base package is always required.

Optional curve packages:

Installing a curve package will provide a singleton instance of that specific curve to be used in SLIP10 derivations.

Keysmith.Net.Secp256k1

Requires the secp256k1 c library in the same directory as your binary to work. Consider building it from source or installing the Secp256k1.Native package which bundles it for you.

Keysmith.Net.ED25519

Uses NSec behind the scenes for curve math which is also MIT licensed.

Features

BIP39

Converts mnemonic words to the seed used for deriving private keys.

[!NOTE]
Only supports the english wordlist.

Usage

byte[] seed = BIP39.MnemonicToSeed("[mnemonics]");
//Or using spans
Span<byte> seed = stackalloc byte[256];
BIP39.TryMnemonicToSeed(seed, "[mnemonics]")

Performance

<img src="./img/bip39_bench.png" />

BIP32/SLIP10

Takes the seed calculated using BIP39 and derives the master private key and child keys using BIP44 derivation paths.

Usage

(byte[] key, byte[] chainCode) = Slip10.DerivePath(
    Secp256k1.Instance,
    seed,
    "m/44'/60'/0'/0/0"
);
//Or using spans
Span<byte> key = stackalloc byte[32];
Span<byte> chainCode = stackalloc byte[32];
Span<uint> path = stackalloc uint[5];
BIP44.Ethereum(path);
Slip10.TryDerivePath(
    Secp256k1.Instance,
    seed,
    key,
    chainCode,
    path
);

Performance

<img src="./img/slip10_bench.png" />

BIP44

Defines the format for derivation paths used for Bitcoin and a lot of other chains following the same spec.

This library defines helper methods to construct these paths to be used for BIP32 derivation.

Usage

string path = BIP44.Ethereum(5);
//     ^ "m/44'/60'/0'/0/5"
// Or using spans
Span<uint> path = stackalloc uint[5];
BIP44.Ethereum(path, 5);