Solidity smart contract project to allow the verification of ECDSA signatures.

Verification of a signature costs approx. 1 million gas.

• secp256r1/prime256v1/P-256

The contract aims to allow on-chain verification of ECDSA signatures. Thus the contract takes the signature, split into r and s, the signed data and the public key that purports to have produced the signature.

 function Verify(uint X, uint Y, uint r, uint s, bytes memory input) public pure returns (bool) 

• uint X, Y EC coordinates of the public key
• uint r, s signature parts
• bytes memory input the signed data/message

If the signature is valid then true is returned else false.

To run the tests, first clone and enter the repo:

git clone https://github.com/maxrobot/elliptic-solidity.git cd elliptic-solidity 

Then,

npm install npm run testrpc 

open a new terminal and in the same directory run,

npm run test 

hyperelliptic.org

jbaylina/ecsol

rynobey/multiexponent

SEC 2: Recommended Elliptic Curve Domain Parameters