Keccak256PHP | returns keccak256 of a given hex encoded string

Keccak256PHP is a C library. Keccak256PHP has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

This extension enables keccak256() function which returns keccak256 of a given hex encoded string. Keccak256 is used for Ethereum message signing, obtaining the wallet address given a public key, and determining the function selector of smart contracts to be provided as data in transactions given a function prototype (and in ABI encoding). The idea of making an extension for PHP first comes from my experiences and secondly from this stackoverflow post. To install this into your php developer files installed box,. $a="cc"; // Hex encoded string. All characters are [0-9a-fA-F] $hash=keccak256($a); echo $hash;. This function returns a hex encoded value of 32 bytes as a string of 64 characters.