https://github.com/miguelmota/sol-ecverify

A solidity library for verifying elliptic curve signatures in Ethereum (ecrecover)
https://github.com/miguelmota/sol-ecverify

cryptography ecdsa ecrecover ecverify ethereum signature smart-contracts solidity truffle verification web3

Last synced: about 1 month ago
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A solidity library for verifying elliptic curve signatures in Ethereum (ecrecover)

• Host: GitHub
• URL: https://github.com/miguelmota/sol-ecverify
• Owner: miguelmota
• License: mit
• Archived: true
• Created: 2017-11-08T23:57:07.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2019-01-20T05:17:52.000Z (over 5 years ago)
• Last Synced: 2024-07-05T13:54:50.281Z (2 months ago)
• Topics: cryptography, ecdsa, ecrecover, ecverify, ethereum, signature, smart-contracts, solidity, truffle, verification, web3
• Language: JavaScript
• Homepage: https://github.com/miguelmota/sol-ecverify
• Size: 8.79 KB
• Stars: 7
• Watchers: 3
• Forks: 4
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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# sol-ecverify

>  A [solidity](https://github.com/ethereum/solidity) library for verifying elliptic curve signatures in Ethereum (wrapper around `ecrecover`).

## API

- **ecrecovery**(hash, sig) -> `address`

  - {bytes32} hash - 32 byte sha3 (keccak256) hash of original message data

  - {bytes} sig - 65 byte signature string

- **ecverify**(hash, sig, account) -> `bool`

  - {bytes32} hash - 32 byte sha3 (keccak256) hash of original message data

  - {bytes} sig - 65 byte signature string

  - {address} signer - 20 byte address of proposed signer

## Getting started

```javascript

const {sha3} = require('ethereumjs-util')

const account = '0xa462d983B4b8C855e1876e8c24889CBa466A67EB'

const msg = Buffer.from('some data')

const sig = web3.eth.sign(account, `0x${msg.toString('hex')}`)

// https://github.com/ethereum/go-ethereum/issues/3731

const prefix = Buffer.from('\x19Ethereum Signed Message:\n');

const pmsg = `0x${sha3(Buffer.concat([prefix, Buffer.from(String(msg.length)), msg])).toString('hex')}`

var signer = await ECVerify.ecrecovery(pmsg, sig)

console.log(signer) // "0xa462d983B4b8C855e1876e8c24889CBa466A67EB"

var verified = await ECVerify.ecverify(pmsg, sig, account)

console.log(verified) // true

```

## Test

```bash

truffle test

```

## Credit

Thanks to [@axic](https://github.com/axic) for providing this [gist](https://gist.github.com/axic/5b33912c6f61ae6fd96d6c4a47afde6d) ([#79](https://github.com/ethereum/EIPs/issues/79#issuecomment-205051630))

## License

[MIT](LICENSE)