Elliptic curve signature operations (ECDSA.sol)

View Source: openzeppelin-solidity/contracts/cryptography/ECDSA.sol

ECDSA

Based on https://gist.github.com/axic/5b33912c6f61ae6fd96d6c4a47afde6d TODO Remove this library once solidity supports passing a signature to ecrecover. See https://github.com/ethereum/solidity/issues/864

Functions

• recover(bytes32 hash, bytes signature)

• toEthSignedMessageHash(bytes32 hash)

recover

Recover signer address from a message by using their signature

function recover(bytes32 hash, bytes signature) internal pure
returns(address)

Arguments

Name	Type	Description
hash	bytes32	bytes32 message, the hash is the signed message. What is recovered is the signer address.
signature	bytes	bytes signature, the signature is generated using web3.eth.sign()

toEthSignedMessageHash

prefix a bytes32 value with "\x19Ethereum Signed Message:" and hash the result

function toEthSignedMessageHash(bytes32 hash) internal pure
returns(bytes32)

Arguments

Name	Type	Description
hash	bytes32