Questions tagged [hash]
A hash function is an algorithm that transfers data input of any size into a fixed size data which acts as a kind of "signature" for the data provided.
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Getting the transaction hash on function call
I am new to Solidity, Web3, and Ethereum.
I am trying to build a web application through which users can upload a file to IPFS, then store the IPFS hash in the blockchain. I am using the React truffle ...
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Parity synced at not existing block 4839212
I have problem with parity, cant get synchronization in archive mode to end,
anything, changing arguments, max-, min-, snapshot-peers, parity verisions do not help.
I have blockchain in archive mode ...
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1answer
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Hash bytes32 and uint32 in Soldiity 0.5.8
How can we efficiently calculate a hash value for a combination of bytes32 and integer value?
Like in JavaScript "someString" + someInt.
I tried:
function fx(bytes32 _left, uint32 _right) public ...
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1answer
11 views
How to retrieve transaction hash value from the Promise object using web3js?
I'm trying to retrieve the transaction hash value after I call my smart contract method.
My Promise object looks like below.
returnPromise:
Promise { "pending" }
<state>: "...
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1answer
27 views
How to encode function call in C
I understand web3 can be basically used for every existing task, however, is there anything we can use for C? My C program is communicating with the RPC server using the curl library, by posting JSON ...
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1answer
35 views
Costs/efficiency of locating stored data on Ethereum
Based on the answer to this question, storing IPFS hashes on Ethereum could be done in 3 ways:
Store it as a string
Store it as a struct
Store it in event log
Ordered from most expensive to least ...
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1answer
82 views
Ideal way to store hash on the ethereum blockchain
I would like to store a certificate on the blockchain. I only need to store its hash and if its been verified by both parties or not.
Should I create a struct that is made up of bytes32 for the hash, ...
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55 views
How does a message signed in Remix IDE?
What is signing method that is used in remix IDE and how is the hash value calculated from the message that is being signed?
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1answer
127 views
Block header hash calculation [duplicate]
What inputs go into the RLP and Keccak function to calculate the block header hash?
I looked up the header struct. Which of those values are fed into the RLP, Keccak? Were nonce and mixed hash left ...
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1answer
67 views
block hash from block-header rlp [duplicate]
Given the RLP of a block header, how do i get the block hash?
https://github.com/ethereum/go-ethereum/blob/master/core/types/block.go#L99
The above link says: Hash returns the block hash of the ...
5
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1answer
154 views
block-header hash verification
As part of a validation service I am working on, I need to be able to verify that the blockHeader hash was created correctly. Based on my understanding following are the steps to regenerate the header ...
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1answer
35 views
How to create and compare a 32 byte hash of a string in solidity 0.5
I simply want to create a 32 byte hash of a string and compare equality to another one, but this is proving almost impossible for some reason. E.g:
hash("a") == hash("b")
My compiler throws errors ...
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1answer
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How network hashrate is being calculated? [duplicate]
Hashrate
The number of attempts that miner makes per second is known as the hash rate or hash power.
Network's hashrate
It is the most important data point in blockchain tech. ... Essentially, the ...
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1answer
32 views
i want to get data from the transaction hash i tried many codes at last i am getting boxes in the output
1) First, I got the input
console.log(web3.eth.getTransaction('0x725fc75264726f409793164e336e7d5ed35df8d2be469a0cc1a3a8cc4756b9b9').then((i) => console.log(i) ));
2) I manually pasted the input ...
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1answer
46 views
Match web3py hashing function to solidity hashing function
If I am using web3py to hash some data, like so,
msgHash = w3.soliditySha3(['bytes32','bytes32'], [dataBytes, saltBytes]);
What would be the correct way to hash inside of a Solidity contract and ...
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1answer
32 views
For Recipient how do I store Sender's account address and Password of Recipient's own account in hashed from?
How to check following things using Solidity:
Password matching (hash formed)
if password matches then transfer take place
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47 views
Can I use an address value in such a hash function
I have a method which updates 3 mappings in my contract.
To save data I use some items properties and message sender address, which allows easily to get users data.
mapping(bytes32 => uint256) ...
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1answer
78 views
How do I use SoliditySha3 in Nethereum?
According to this, web3 should contain the function soliditySha3. It can take an object (JSON), serialize it, and use the result as input to Keccak256. According to the documentation, the arguments ...
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1answer
76 views
Hash functions soldity to python
In Solidity, I run the following code:
function hashTest() public returns(bytes32,bytes32,bytes32) {
bytes32 _solution = 0xbc756c25d68ea2f260ea5f15e1e1c734c019cbc014270dd386eacca4699f60f6;
bytes32 v ...
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1answer
30 views
How will Proof of Stake affect blockhash generation
When (and if) Ethereum switches to proof of stake, how will the hash of blocks (most likely) be set?
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0answers
50 views
Does web3 soliditySha3 work with json object?
The above hash data is generated by web3 soliditySha3 with the objects below.
It seems the function generates hashes as I wanted; each object has different hash value. But I am not sure if it's ...
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0answers
14 views
compare signed and unsigned hash [duplicate]
with ecrecover the signer's address can be extracted from a signed hash: ecrecover(signedHash, v, r, s) == address
But I could not discover how to validate the hash.
function validateHash(...
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0answers
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Can we use Ethereum Swarm to store normal data other than blockchain or dapp data.
I want some basic data to be stored like name and city phone no etc.So just want to ask can I use ethereum swarm just to store file and make several node to create decentralized storage.
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2answers
282 views
Encrypt data using public key
I have three data fields in a form which will return a string. I would like to hash the value of these three strings and store it in the blockchain. However the data in these three strings is ...
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1answer
82 views
get same output as solidity SHA256 in JS
Is there a js function/library which gives same output as sha256 in solidity? I am saving a hash in a mapping and can access it via cli (truffle console) and see what the hash is but I would like to ...
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1answer
86 views
Is data inputted as a parameter for a smart contract function visible?
Let's say I have something like this:
bytes32 person;
function registerPerson(address _person) public {
bytes32 x;
x = sha256(abi.encodePacked(_person));
person = x;
}
For privacy reasons, ...
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1answer
35 views
Hashing header “offline” python
I am trying to prove that the TransactionsRoot and the ReceiptsRoot do belong to a specific block. So that I can verify without web3 that all the transactions and receipts actually belong to this ...
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1answer
30 views
How to get two points (x, y) from an encoded pubkey?
this gives a valid address from two points;
address(uint256(keccak256(abi.encodePacked(point[0], point[1]))) & 0x00FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);
but does that mean that if you are ...
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1answer
220 views
Creating hash of a struct in Solidity and JavaScript
I have created a message hash in JavaScript using:
let message = {
'message': 'Receiver closing signature',
'sender': sender,
'balance': value
};
message = web3.utils.toHex(...
0
votes
1answer
27 views
Creating an Ethereum id Hash
I'm trying to understand how to convert my transaction data into the id hash before signing the transaction.
Let's say I have this data:
transaction = {
'to': to_address,
'from': ...
0
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1answer
37 views
Checksum vs. Hash: Differences and Similarities ? [closed]
What are similarities and differences between a "checksum" algorithm and a "hash" function?
Can they be used instead of each other? Or their usage are different?
For example, for verifying the ...
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2answers
35 views
retrieving an original data from a hash: is it reliable?
Normally, one of the purposes of hashing a string (such as a transaction) is summarizing the data to save the size because of the space limitation.
If this proposition is true, now assume we need to ...
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1answer
167 views
messageHash hash function
In this example, by which algorithm is messageHash hashed by?
web3.eth.accounts.sign("Hello, world!", '0x0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef')
{ message: 'Hello, world!',
...
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votes
2answers
238 views
How is the keccak256(a, b) function implemented?
I need to understand how keccak256(a, b) is implemented and how it differs from keccak256(a || b).
Is the content padded?
I need this because I do not want to allow for vulnerabilities where a user ...
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votes
1answer
66 views
How does knowing the root hash of a past world state help me to revert to this world state?
In section 4.1 of the Ethereum yellow-paper (http://gavwood.com/Paper.pdf) the following is written:
The world state (state), is a mapping between addresses (160-bit
identifiers) and account ...
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2answers
80 views
Common use cases for hashing functions? [closed]
I'm developing my first dapp with solidity and I was wondering in which cases should I use hashing functions like keccak. I know how they work but it is not clear to me when should I use them and to ...
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Why are Ethereum addresses hashes of public keys?
I understand how Ethereum addresses are generated. This thread has a great explanation: How are ethereum addresses generated?
However, what this explanation is missing is why a hash is used.
There ...
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0answers
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are all bits of a keccak256 'uniformly distributed'? [closed]
If I have a truly random data source, and generate keccak256 hashes of the numbers of this source:
N1 = keccak256(rnd1)
N2 = keccak256(rnd2)
N3 = keccak256(rnd3)
...
are all 256 bits of the ...
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2answers
105 views
Is data stored in string form in smart contracts publicly readable?
As a beginner, I wrote the contract below for learning purposes, aiming to create a "Safe Messaging System":
pragma solidity ^0.4.24;
contract SafeMessage {
string message;
string password;
string ...
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0answers
36 views
hash an array of structs
So what I am trying to do is create a keccak256 of an array of structs.
pragma solidity ^0.4.24;
pragma experimental ABIEncoderV2;
contract Test
{
struct test1 {
address test;
...
0
votes
1answer
29 views
Hash of address pair combination where order is irrelevant
I have a contract where I often set stuff for a combination of 2 addresses. Because the parameters addressA and addressB are interchangeable I currently save the information redundantly.
Example:
...
0
votes
1answer
144 views
Keccak256 collision in function’s prototype
I was reading the github version of the upcoming book Mastering Ethereum, where the author defines the function selector as The first 4 bytes of the Keccak256 hash of the function’s prototype. This ...
0
votes
1answer
406 views
sha256() output
I used sha256() hash of a string and I got the following result
0x0de69f56365c10550d05e65ae8229dd0686f7894a807830daec8caa879731f4d for string Hello World2. Now I want to find out leading byte from the ...
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0answers
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uncle block' hash
I want to know if the Uncle Hash hashes the entire block or just the Uncle block header. Also I want to know Structure of Ethereum's Uncle List,too.I would appreciate it if you let me know.
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1answer
1k views
Convert hash function hex to bytes32
The output of hash function SHA256 is a hex string of size 64. For example: 3ed54831f488a22b28398de0c567a3b064b937f54f81739ae9bd545967f3abab
I want to call the function of a smart contract with the ...
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1answer
236 views
Why does keccak256() return bytes32 instead of uint256 in Solidity?
A hashing function outputs an integer that is 256 bits long... so why not store it as such?
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35 views
Can one safely use a bitcoin block hash as a source of randomness in an ethereum contract?
This question here Why aren't block hashes a reliable source of randomness? explains why it is not a good idea to use an ethereum block hash as a source of randomness (SoR) for a contract C; the ...
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1answer
57 views
Is it possible to have a signature as the mapping key type?
If I have someone's signature and I want to use it in a mapping, is there a way to have it serve as the key in that mapping?
Would I need to use mapping (string => uint), or mapping (bytes32 => ...
0
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1answer
265 views
Compare byte32 Keccak256 to the same Keccak256 stored in a byte32 array
I want my function to be able to accept an array of Hashed secrets as a parameter and since solidity doesn't allow for strings, I had to use a byte32[].
The string parameter is an intake for the user'...
0
votes
1answer
193 views
Transaction Signing & Hashing
I've been looking through EthereumJ, Trying to understand how transaction hashing and signing works.
From what I can tell from the code, the signature is created by signing the hash of the RLP ...
