GivingThanks

First Flight #28
Beginner FriendlyFoundry
100 EXP
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Submission Details
Severity: high
Invalid

abi.encodePacked() should not be used with dynamic types when passing the result to a hash function such as keccak256()

Summary

Use abi.encode() instead which will pad items to 32 bytes, which will prevent hash collisions => 0x123456 => abi.encodePacked(0x1,0x23456), but abi.encode(0x123,0x456) => 0x0...1230...456). Unless there is a compelling reason, abi.encode should be preferred. If there is only one argument to abi.encodePacked() it can often be cast to bytes() or bytes32() If all arguments are strings and or bytes, bytes.concat()` should be used instead.

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Lead Judging Commences

n0kto Lead Judge 7 months ago
Submission Judgement Published
Invalidated
Reason: Too generic

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