dart-secp256k1

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# dart-secp256k1

> **⚠️ Security notice — please upgrade to ≥ 0.4.0 (important)**
>
> Versions **≤ 0.3.0** generated private keys and ECDSA nonces with a biased,
> low-entropy routine. Keys produced by `PrivateKey.generate()` on those
> versions are weaker than intended, and because the same routine produced the
> signing nonce, a private key can in principle be recovered from a handful of
> signatures.
>
> - If you only imported existing keys (`PrivateKey.fromHex`) and **never signed**
>   with an affected version, your keys are unchanged.
> - If you **generated** a key with this package at ≤ 0.3.0, **or signed** with
>   any key using ≤ 0.3.0, treat that key as weak: upgrade to ≥ 0.4.0 and rotate
>   to (move any funds to) a freshly generated key.
>
> 0.4.0+ samples keys uniformly from `Random.secure()` and derives nonces
> deterministically per RFC 6979 (0.4.1 also hardens signature verification).

Pure secp256k1 implement for dart language.

secp256k1 refers to the parameters of the elliptic curve used in Bitcoin's public-key cryptography, and is defined in Standards for Efficient Cryptography (SEC) (Certicom Research, http://www.secg.org/sec2-v2.pdf). Currently Bitcoin uses secp256k1 with the ECDSA algorithm, though the same curve with the same public/private keys can be used in some other algorithms such as Schnorr.

## Usage

A simple usage example:

```dart
var pk = PrivateKey.fromHex('c37c299bb7f5ffd8d9329d052983342a8c3234ff3b3fa32a292187341f7146d7');
var pub = pk.publicKey;
print(pub.toHex());
print(pub.toCompressedHex());

var messageHash = 'b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9';
var sig = pk.signature(messageHash);
print(sig.verify(pub, messageHash)); // true
```

## Features and bugs

WARN: This lib does not not provide deterministic ECDSA signature!

Please file feature requests and bugs at the [issue tracker][tracker].

[tracker]: https://github.com/c0mm4nd/dart-secp256k1/issues

dart-secp256k1

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