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Ethereum: What is the type of use of hash in EIP-712?
The proposal for the improvement of Ethereum (EIP) 712, also known as Keccak-512, is a cryptographic hash function designed to be used to sign messages. In solidity, one of the most popular programming languages to build decentralized applications in the Ethereum block chain, we can use this feature to create robust and insurance signature mechanisms. This article will deepen in the case of use of type of hashes in EIP-712.
What is a hash type?
A hash type, also known as Keccak-512 or simply K256, is a cryptographic hash function that takes a chain (in this case, the name of the contract) and produces a fixed size summary. It is essentially a hash Sha-3-512 with the exit of 32 bytes long.
EIP-712: A key concept
The EIP-712 proposal introduced an additional field for contracts using Keccak-512 signatures. This field is called “type” or “label”, which contains additional information about the contract. It is not related to the HASH function itself, but it serves as a way of providing context and metadata on the contract.
Use Case: Write Hashes in EIP-712
Type hashes play a crucial role in EIP-712, fulfilling several purposes:
- Contract metadata : The hash type is used to identify the contract at execution time. When an account calls for a function in this contract, you can verify that you are executing code of this specific contract using the Keccak-512 firm.
`SOLIDITY
Mycontract contract {
bytes32 private constant my_type_hash = keccak256 ("mycontract");
// Contract metadata are stored here
}
- Test of existence : The hash type can be used to demonstrate that there is a contract in the block chain in execution time, which makes it safer and less prone to be eliminated.
SOLIDITY
Mycontract contract {
bytes32 private constant my_type_hash = keccak256 ("mycontract");
// Contract metadata are stored here
}
- Audit
: The hash type can be used to audit contracts for compliance with certain standards or regulations, which facilitates the identification of possible problems.
SOLIDITY
Mycontract contract {
bytes32 private constant my_type_hash = keccak256 ("mycontract");
Audit Function () Public {
REQUIRE (bytes32 (0) == KECCAK256 ("MyContract"), "The contract is not valid");
}
}
- SECURITY : The type of hashes can be used to add an additional layer of security to the contracts by making the attackers perform reverse engineering of the contract.
SOLIDITY
Mycontract contract {
bytes32 private constant my_type_hash = keccak256 ("mycontract");
MyFunction Function () Public {
// Code here
}
}
`
In conclusion, the type hashes in EIP-712 are a powerful tool that can be used to improve the safety, hearing and management of metadata contracts. By storing additional context and information on contracts that use Keccak-512 signatures, developers can create more robust and safe decentralized applications.
However, it is essential to keep in mind that, although type Hashes provide these benefits, they also introduce complexity and additional requirements for the development and implementation of contracts. Therefore, it is crucial to carefully evaluate the case of use of EIP-712 in its specific project before implementing them.