API.md

• SignatureUtils
  • recoverAddress
  • countSignatures
  • parseSignature
  • toEthPersonalSignedMessageHash
  • toEthBytes32SignedMessageHash
  • uintToString
  • recoverAddresses

SignatureUtils

Alexander Kern [email protected]

function recoverAddress

SignatureUtils.recoverAddress(_hash, _signatures, _pos) pure 1c2a15b8

Recovers an address using a message hash and a signature in a bytes array.

Inputs

type	name	description
bytes32	_hash	The signed message hash
bytes	_signatures	The signatures bytes array
uint256	_pos	The signature's position in the bytes array (0 indexed)

function countSignatures

SignatureUtils.countSignatures(_signatures) pure 33ae3ad0

Counts the number of signatures in a signatures bytes array. Returns 0 if the length is invalid.

Signatures are 65 bytes long and are densely packed.

Inputs

type	name	description
bytes	_signatures	The signatures bytes array

function parseSignature

SignatureUtils.parseSignature(_signatures, _pos) pure b31d63cc

Extracts the r, s, and v parameters to ecrecover(...) from the signature at position _pos in a densely packed signatures bytes array.

Based on OpenZeppelin's ECRecovery

Inputs

type	name	description
bytes	_signatures	The signatures bytes array
uint256	_pos	The position of the signature in the bytes array (0 indexed)

function toEthPersonalSignedMessageHash

SignatureUtils.toEthPersonalSignedMessageHash(_msg) pure d8a40f6b

Converts a byte array to a personal signed message hash (result of web3.personal.sign(...)) by concatenating its length.

Inputs

type	name	description
bytes	_msg	The bytes array to encrypt

function toEthBytes32SignedMessageHash

SignatureUtils.toEthBytes32SignedMessageHash(_msg) pure e5990d20

Converts a bytes32 to an signed message hash.

Inputs

type	name	description
bytes32	_msg	The bytes32 message (i.e. keccak256 result) to encrypt

function uintToString

SignatureUtils.uintToString(v) pure e9395679

Converts a uint to its decimal string representation.

Inputs

type	name	description
uint256	v	The uint to convert

function recoverAddresses

SignatureUtils.recoverAddresses(_hash, _signatures) pure f0c8e969

Recovers an array of addresses using a message hash and a signatures bytes array.

Inputs

type	name	description
bytes32	_hash	The signed message hash
bytes	_signatures	The signatures bytes array

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