Questions tagged [keccak]
keccak is a cryptographic family which is used in ethereum and nowerdays provides the standards for sha-3
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questions
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Passing a hash value to function
I'm trying to authenticate users by comparing the hashes created by backend server and contract. Seems like "byte32" values cannot be coerced into strings. So, instead I'm converting it into ...
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1answer
26 views
How to Keccak 256 hash in front end JavaScript before passing it to my smart contract
I would like to build a simple JavaScript (JS) front end that checks if a field submitted is the pre-image of a keccak256 hash I already know in my smart contract. I currently use the following:
...
2
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1answer
74 views
Why is there a SHA256 pre-compiled contract when SHA256 is also an opcode?
The question is in the title :). Trying to understand why there is both an opcode and pre-compiled contract for SHA256. To execute the computation, would people canonically "CALL" into the pre-...
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1answer
36 views
keccak256 output is different on ruby vs javascript…?
Ruby ethereum libraries use:
https://github.com/phusion/digest-sha3-ruby
require 'digest/sha3'
'0x' + Digest::SHA3.new(256).hexdigest('0x0')
=> "...
1
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1answer
29 views
Is it cheaper overall to store a keccak hash or to store a ripemd(keccak) hash?
As titled. I'm learning to build a DApp and I'm wondering if it's worth it to add the extra RIPEMD layer over keccak for a shorter hash to reduce storage costs.
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1answer
64 views
converting keccak from old version: pragma solidity 0.4.19; [duplicate]
I am trying to compile following code:
pragma solidity 0.5.9;
contract test{
//https://github.com/ethereum/solidity/issues/3469
address payable owner;
mapping (address => bool) pd;
uint public sS;...
1
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1answer
46 views
Running Solidity's keccak256 in python
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.
What's the ...
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1answer
41 views
Solidity keccak behavior
I have a weird issue. I'm trying to keccak256 packed encoded arguments in Rust [which should mimic Soldity's behavior to be checked on chain later]. I've failed for now. To figure out the issue I've ...
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1answer
44 views
Unable to store hash in blockchain [closed]
I have a major problem/ I've got a simple smart contract that stores data (a text in blockchain and it works well, but when I pass keccak256, it stores only the string passed in as an argument but not ...
2
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1answer
125 views
Is any 40 character hex string a valid ethereum address?
I know an ethereum address is generated by getting the last 20 bytes of the keccak-256 hash of the public key, which is 40 hex digits. I also know, an address does not need to have transactions ...
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1answer
105 views
Solidity. Concatenate and hash two strings
Hi all I need tho sha256 two strings. I am new to solidity. This is what I've got:
function addressToString(address _addr) public pure returns(string memory)
{
bytes32 value = bytes32(uint256(...
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1answer
47 views
Generating an address from a public key in C++
Example:
Input key = 0x025f37d20e5b18909361e0ead7ed17c69b417bee70746c9e9c2bcb1394d921d4ae
Output address = 0xd09D3103CcABfb769eDc3e9B01500Ca7241D470A
I have been using an algorithm from keccak-tiny....
1
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1answer
68 views
How can i `ecrecover` in solidity to verify the digest produced by `web3.utils.soliditySha3` in JS side?
Javascript side:
id = 128
uri = "xxx://xxx"
hash = web3.utils.soliditySha3(id,uri)
sign = web3.eth.accounts.sign(hash1, privateKey)
Solidity side:
function(uint256 id, string memory uri,bytes v, ...
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1answer
159 views
Different outputs for Keccak256(), which one is right?
To get a value from contract storage I used this geth code succesfully:
var contractAddress = '0x88e726de6cbadc47159c6ccd4f7868ae7a037730'
var index = '...
asked Aug 22 '19 at 10:24
Juan Ignacio Pérez Sacristán
2,7633 gold badges27 silver badges60 bronze badges
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Cross-posted from Stack-Overflow: Using Google Cloud Key Management Service to sign an Ethereum transaction
Cross-posted from question
I've been working on writing a signer service for an Ethereum transaction manager and I need to sign Ethereum transactions using Google KMS Golang APIs. I'll try and ...
2
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1answer
54 views
How are we able to send 512 bit hash as a bytes32 variable?
I have a code that is working:
solidity
function checkSignature(bytes32 h, uint8 v, bytes32 r, bytes32 s) public pure returns (address signer) {
bytes memory prefix = "\x19Ethereum Signed ...
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3answers
296 views
How to generate the full list of function selectors for a contract?
A contract has many functions and how to automatically generate the full selector list, including inherited functions, for the whole contract?
Preferred solution shouldn’t require more than a web ...
3
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1answer
54 views
Why solidity's keccak returns different value from online generators?
I try to implement my own little modifited commit&reveal voting. I have problem with revael phase. Reveal metod signature look like:
function reveal(bytes32[] memory _reveals, bytes32[] memory ...
0
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1answer
65 views
What is the best way to store a hexadecimal value in an array in Solidity?
I am attempting to store a hash (web3.sha3) into an array in a smart contract.
What is the best way to do that?
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1answer
83 views
Is there a way to obtain the same Hash using Keccak256 from Web3 and ZoKrates hash function such as sha256packed?
I am trying to use the hash obtained from keccak256 (applied to a number or input) and using it into sha256packet from ZoKrates (or other function) for comparing it with the Hash obtained in Zokrates ...
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42 views
Need to help in adding bigendian support for Keccak256.cpp
Need help in making the keccakf function based on endiness in https://github.com/ethereum/solidity/blob/develop/libdevcore/Keccak256.cpp. I have gone through similar functionality at https://github....
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0answers
103 views
exploiting keccak for random number generation?
Whenever a ticket will be purchased, a random number will be generated
function _mightWin()
internal
{
address _player = msg.sender; // players address
uint256 ...
4
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1answer
119 views
Is pre 0.5.0 keccak256(a,b) equivalent to post 0.5.0 keccak256(abi.encodePacked(a,b))?
In pre 0.5.0 Solidity if you wanted to hash a some set of data you would do keccak(a, b, c). Post 0.5.0 keccak only takes 1 arg and it is suggested to use keccak(abi.encodePacked(a,b,c)) instead
But ...
3
votes
1answer
191 views
Where is string stored in solidity storage?
I'm trying to check where is stored a string in storage in Solidity.
For testing this I'm using this code:
pragma solidity 0.5.4;
contract AssemblyString {
string s; // slot 0
function set(...
1
vote
1answer
284 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 ...
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2answers
1k views
How to compare two bytes32?
I was using strings before I read that using bytes is gas cheaper. Now I changed my strings to bytes32 but I don't know how to compare them. I need to check if two bytes32 are equal in the require ...
0
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1answer
429 views
keccak256 string comparison failure
When trying to compare a string from storage to a string being passed into a function (memory), I am getting the following error when attempting to convert the memory string using keccak256(). What am ...
0
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1answer
87 views
Safe for random number?
My thought is that we come up with a random number in one block and make it private so no one can see it. The timer will allow a few blocks to be mined and then the revealNumber function allows the ...
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91 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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5answers
488 views
Can I easily generate a public address which has no private key?
I might be wrong in some of the facts that I state here, so please correct me if necessary.
My understanding:
Private key - 256 bits
Public key - 256 bits
Public address - the last 160 bits of a ...
1
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1answer
558 views
What is the gas cost of keccak256(“abc”)?
According to this answer, the gas cost of keccak256 is:
30 gas + 6 gas for each word (rounded up) for input data to a SHA3 Keccak-256 operation
I'm assuming that the size of a word is 256 bits and ...
0
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2answers
266 views
Keccak256 check Key
So I need a function that checks if a key fits the hash of that said key. This is what I have:
function checkKey(bytes32 hash, bytes32 privateKey) public returns (bool success) {
require(...
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1answer
1k views
Is it safe to use abi.encodePacked in production solidity code?
In my solidity game project, I am using this:
if (king == keccak256(abi.encodePacked(player)){
//continue as king
} else{
// not king
}
Where player data type is bytes and king is a player ...
1
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2answers
736 views
C# how to compute Keccak256 to match Solidity?
I have a simple Solidity function as below:
function testKeccak(uint8[] buffer) public pure returns (bytes32) {
return keccak256(abi.encodePacked(buffer));
}
Testing the keccak256 hash using ...
2
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1answer
44 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 ...
4
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2answers
817 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 ...
1
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2answers
162 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 ...
1
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0answers
76 views
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 ...
1
vote
1answer
280 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
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1answer
202 views
How to get EVENT name from event signature hash?
I fount that some developers can get event_signature_hash for a event's name MyEvent(uint256) by using bellow code:
event_signature_hash = w3.sha3(text='MyEvent(uint256)').hex()
But vice versa, I ...
2
votes
1answer
920 views
bytes4(keccak256(“function(uint256)”)) vs. (abi.encodeWithSignature(“buyItem(uint256)”)
What is the (a) technical difference between and (b) practical difference between these, i.e., when do you use one or the other:
bool result = address(contract).call.value(10)(bytes4(keccak256("...
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1answer
859 views
How to typecast keccak256 function with multiple arguments to uint256?
solidity ^0.4.19 (works)
uint256 randNonce++;
return uint256(keccak256(msg.sender, randNonce, now))
solidity ^0.4.24 (throws)
uint256 randNonce++;
return uint256(keccak256(abi.encodePacked(msg....
-2
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1answer
391 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?
1
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1answer
864 views
From golang sha3 to solidity sha3
Trying to match "golang.org/x/crypto/sha3" lib
with solidity sha3() is giving me a hard time.
Its been discussed in here, but I somehow cant apply it in go.
How do I handle a big.Int type s.t i get ...
2
votes
2answers
156 views
Why public keys are not used directly as account addresses? [duplicate]
I understand that addresses are hashes of the public keys. But why? What is the rationale behind this design decision?
And why 160 bits? Why not just use the hash directly? Is 160-bit guaranteed ...
0
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0answers
19 views
How to use bytes to get the same hashed output [duplicate]
I previously asked a question here: link to previous question.
Found out the answer is to use string instead of bytes here:
pragma solidity ^0.4.18;
contract C {
bytes32 public temp;
...
0
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2answers
982 views
solidity ..which hashing algorithm to use?
I have tried using many hashing algorithms but there output in solidity doesn't match with the one given in online converters.
Here is my program:-
pragma solidity ^0.4.18;
contract C {
bytes32 ...
0
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1answer
254 views
Keccak256 of msg.sender and timestamp: what's the likelihood of an output coincidence?
Let's think about this code:
function publishEtherBox (bytes32 _label, string _ownerUrl, uint _lifespan) external onlyWhenRunning() payable {
require(ownerToEtherBoxes[msg.sender].length < ...
0
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1answer
408 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'...
3
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1answer
2k views
SOLIDITY: How to get a bytes32 keccak256 hash of an address and 2 uint256 variables
I would like to know how to get a bytes32 keccak256 hash of an address and 2 uint256 variables.
I want something that will look like this. But from the remix IDE errors, I need to make the the 3 ...
