Hashing in solidity | Divyansh Rai
Shared on Blockchain
Hashing in solidity
A cryptographic hash function is an algorithm that takes an arbitrary amount of data as input and produces the enciphered text of fixed size. Even a slight change in the input gives a completely different output.
Ethereum uses Keccak for hashing which is similar but not the same as SHA_256. For proof of work, it uses a custom scheme called ethash which is designed to be ASIC-resistant.
Example: In the below example, a smart contract is created to take a string as input and give an 8 digit hash as an output.
// pragma versionpragma solidity ^0.6.6;// Creating a contractcontract helloGeeks{ // We want hash to be of 8 digits // hence we store 10^8 which is // used to extract first 8 digits // later by Modulus uint hashDigits = 8; // Equivalent to 10^8 = 8 uint hashModulus = 10 ** hashDigits; // Function to generate the hash value function _generateRandom(string memory _str) public view returns (uint) { // "packing" the string into bytes and // then applying the hash function. // This is then typecasted into uint. uint random = uint(keccak256(abi.encodePacked(_str))); // Returning the generated hash value return random % hashModulus; }}Hello Everyone, In recent years, Docker has revolutionized the way we develop, deploy, and manage software applications. With its lightweight and portable containerization technology, it enables developers to package their applications along with all their dependencies into a single unit, making it easier to run across different environments. This post will provide an overview of the concepts and components of Docker, helping you grasp the fundamentals of this powerful tool.
What are Webhooks? The ability of independent online systems to communicate with one another and share data is the core of what makes online services valuable today. In this post, will look at webhooks.