Nov 10, 2017 · In 2012, Keccak team won the competition. From then on, developers implemented lots of “sha3” solution based on Keccak. However, in 2014, NIST modified Keccak solution and released FIPS 202, and this updated proposal becomes official SHA-3 standard on Aug 2015. Many “old” program still use Keccak, and do not upgrade to official SHA-3 ...

Keccak is nice that it has arbitrary inputs and an infinite input space. This enables one to "make a hash" of a super large file where each input causes the internal state to scramble up some more. The hash should entirely change if a single bit of data in the source is different - unlike say a CRC32, or a checksum.

Apr 13, 2017 · Ethash is the proof-of-work algorithm. Keccak-256 is the most commonly-used hash function. Keccak-256 is used internally in places like when making hashes for block headers, but the place you're most likely to run into it, and the place discussed in the post you link, is when making hashes of things in your own Solidity contract.

Feb 24, 2023 · I was using the Keccak function provided by the Keccak Project library, but I was not getting identical results with what the Ethereum project produces, for the life of me I couldn't figure out why my code wasn't working, and after days of debugging and head scratching I finally discovered that the keccak256 function used in the Ethereum ...

Feb 13, 2019 · keccak; Share. Improve this question. Follow asked Feb 13, 2019 at 22:19. 0TTT0 0TTT0. 672 2 2 gold badges ...

Dec 8, 2022 · In Solidity, let's say there are two contracts A and B with the same code as in the following example. By the way, do they return the same bytes32 value when retrieving ROLE?

But vice versa, I couldn't find anyways to detect Event's name from event_signature_hash. This is not possible, (good) hashing algorithms are intentionally one way.

Feb 29, 2020 · I want to run Soliditykeccak256(abi.encodePacked(challenge_number, msg.sender, nonce)) where nonce is uint256, challenge_digest is bytes32, challenge_number bytes32, testTarget is uint.

This was different from the padding proposed by the Keccak team in The Keccak SHA-3 submission version 3 (final, winning version). The difference is the additional '01' bits appended to the message. People are now calling the "submitted version 3" SHA-3 Keccak hashing "Keccak" and the finalized NIST SHA-3 standard "SHA-3".

May 18, 2018 · I want to pass a Keccak-256 hashed value from the front-end, say a string "experiment". I store the value in Solidity, and, when passing the same value for the second time, a Solidity function needs to compare the values, and give true, if those values are identical. I have been unsuccessful of comparing the values so far.