https://github.com/tdrerup/elliptic-curve-solidity

A pure solidity implementation of elliptic curve math, parameterised for curve secp256r1 / prime256v1 / p256.
https://github.com/tdrerup/elliptic-curve-solidity

ecdsa ecdsa-signature elliptic-curves ethereum p256 secp256r1 solidity

Last synced: 4 months ago
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A pure solidity implementation of elliptic curve math, parameterised for curve secp256r1 / prime256v1 / p256.

• Host: GitHub
• URL: https://github.com/tdrerup/elliptic-curve-solidity
• Owner: tdrerup
• License: mit
• Created: 2019-02-06T23:28:05.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2024-03-25T19:39:25.000Z (over 1 year ago)
• Last Synced: 2025-05-25T23:36:23.139Z (4 months ago)
• Topics: ecdsa, ecdsa-signature, elliptic-curves, ethereum, p256, secp256r1, solidity
• Language: JavaScript
• Size: 11.7 KB
• Stars: 103
• Watchers: 4
• Forks: 21
• Open Issues: 6
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# elliptic-curve-solidity

A pure Solidity implementation of elliptic curve secp256r1 / prime256v1 / p256.

#### Signature verification

The main purpose of this contract is verification of ECDSA signatures based on curve secp256r1 / prime256v1 / p256. To verify a signature, use the function

    function validateSignature(bytes32 message, uint[2] memory rs, uint[2] memory Q) public pure

        returns (bool)

where

* `bytes32 message` is the hash of the signed message

* `uint[2] rs` contains the signature

* `uint[2] Q` contains the coordinates of the public key

The function returns `true` for valid signatures, `false` otherwise.

Notes:

* To disambiguate public keys when verifying signatures, activate condition `rs[1] > lowSmax` in `validateSignature()`.

* To run the tests, first install the node packages (`npm install`) and then run `truffle test`.

* Verifying signatures is costly (!) in terms of gas.

#### Miscellanea

* Tested with Solidity 0.5.0 and Truffle v5.0.1.

* Some newer versions of web3.js cause issues due to improper handling of bigNumber objects.

* Some components of the contract are based on code written by Andreas Olofsson, Alexander Vlasov (https://github.com/BANKEX/CurveArithmetics), and Avi Asayag (https://github.com/orbs-network/elliptic-curve-solidity).

* Versions of the contract have been deployed on the main Ethereum network (https://etherscan.io/address/0xf471789937856d80e589f5996cf8b0511ddd9de4) as well as the Ropsten test network (https://ropsten.etherscan.io/address/0x8025532f39e089d8bb3ed783ccdd974ee8c3948f).