Abi.encode VS abi.encodePacked

abcoathup · June 2, 2020, 3:06am

To see ECDSA being used, have a look at the GSN Strategy:

OpenZeppelin/openzeppelin-contracts/blob/v3.0.1/contracts/GSN/GSNRecipientSignature.sol

pragma solidity ^0.6.0;

import "./GSNRecipient.sol";
import "../cryptography/ECDSA.sol";

/**
 * @dev A xref:ROOT:gsn-strategies.adoc#gsn-strategies[GSN strategy] that allows relayed transactions through when they are
 * accompanied by the signature of a trusted signer. The intent is for this signature to be generated by a server that
 * performs validations off-chain. Note that nothing is charged to the user in this scheme. Thus, the server should make
 * sure to account for this in their economic and threat model.
 */
contract GSNRecipientSignature is GSNRecipient {
    using ECDSA for bytes32;

    address private _trustedSigner;

    enum GSNRecipientSignatureErrorCodes {
        INVALID_SIGNER
    }

This file has been truncated. show original

There is also a tutorial: Advanced GSN: GSNRecipientSignature.sol

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Abi.encode VS abi.encodePacked

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