Questions tagged [signature]

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40
votes
6answers
20k views

Create and sign OFFLINE raw transactions?

I'm looking to create a raw transaction, sign it, and broadcast it using the eth.sendRawTransaction RPC method. I would like to do this offline using code or an open-source library OR online but ...
38
votes
4answers
17k views

Get public key of any ethereum account

Can I somehow get the public key of an ethereum account knowing just the corresponding ethereum address (e.g. 0x54dbb737eac5007103e729e9ab7ce64a6850a310)?
33
votes
1answer
4k views

Where is the private key for a contract stored?

This is a question that I am asked often by developers who assume that a contract has a private key of its own to sign any transactions that it makes.
28
votes
5answers
9k views

How can I sign a piece of data with the private key of an Ethereum address?

I would like to use the key pair of one of my Ethereum accounts to sign a piece of data. How can this be done?
27
votes
1answer
12k views

What does v, r, s in eth_getTransactionByHash mean?

In Ethereum JSON-RPC I found the return is: Returns Object - A transaction object, or null when no transaction was found: hash: DATA, 32 Bytes - hash of the transaction. nonce: QUANTITY - the number ...
26
votes
3answers
3k views

Is Ethereum secure against an attack by quantum computers?

Does Ethereum implement Post-quantum cryptography? Or will the network break once a malicious actor gains control of an effective quantum computer?
25
votes
1answer
12k views

Ethereum ecrecover signature verification and encryption

The question of signing and verifying signatures with Solidity has been asked in these questions, both of which I have tried to study: How can I sign a piece of data with the private key of an ...
19
votes
4answers
13k views

workflow on signing a string with private key, followed by signature verification with public key

I know this question has been asked and answered, but while trying to get everything to work, I've come across some problems. This is what I'm trying to do: 1. take a target string 'Schoolbus' 2. ...
16
votes
2answers
5k views

Is it safe to reuse Ether addresses?

I believe it's viewed as unsafe in Bitcoin because of the way transactions are signed. Is this also true for Ether addresses?
15
votes
1answer
2k views

Getting the wrong address back from ecrecover

When I sign a string using the following code I get back a different address to the one I signed with. The address returned is different for different strings. const util = require('ethereumjs-util') ...
14
votes
5answers
8k views

How do you sign an verify a message in javascript proving you own an Ethereum address?

Is there a js library or even just pure js where I can sign and verify I own an Ethereum address?
12
votes
1answer
760 views

Ethereum signature verification not matching

What I want to achieve is sign a message and then verify the signature whether verified by same address or not. Contract to Invoke ecrecover method to verify the address contract MyAuth { ...
11
votes
2answers
8k views

Invalid sender error on private chain

I created a transaction in Go, signed it with a EIP155Signer signer, but when I try to publish the transaction through the Go client to the private blockchain, I get the error Invalid sender. Any idea ...
11
votes
1answer
6k views

How can I verify a signature with the web3 javascript API?

Using the javascript web3 API I can create a signature like this: > web3.eth.sign(eth.coinbase, "0xdeadbeef") "...
10
votes
3answers
17k views

How to properly create a raw transaction and sign it using web3 in browser

I want to create and sign a transaction in browser using web3. In order to create a raw transaction, I think I have to do something like this (hopefully you can fill the gaps of my knowledge) var pk =...
9
votes
2answers
5k views

How does one properly use ecrecover to verify Ethereum signatures?

I've been searching to figure out what I'm doing wrong here, but I've had no luck yet. As far as I can tell, I'm using ecrecover correctly, but I can't seem to get back the signing Ethereum address. ...
8
votes
2answers
649 views

What if two ether functions have the same signature?

It should not be hard to find collision. There is only 4 294 967 296 possible signatures.
8
votes
1answer
5k views

Getting an address from ethereumjs-utils ecrecover

I am trying to sign a string using web3.eth.sign() and then get the public key I signed with from the signature. To do this I am using ecrecover() from ethereumjs-utils, which returns a buffer. When I ...
8
votes
4answers
1k views

How can I verify a secp256r1 signature using solidity

Sorry if you find these questions are basic, but I am new to encryption. As far as I know, Solidity have ecrecover function for this purpose, but it use secp256k1 signature. which I am intend to use ...
7
votes
2answers
4k views

Do I have to unlock my account in geth to call a web3.eth.sign() in JavaScript?

I have: A geth account Access to web3 API I want to: Invoke the function, web3.eth.sign(coinbase, sha) If I put this in a javascript file sign.js, and I call node.js, will it sign my message? Or ...
7
votes
1answer
1k views

Demystify Transaction signing process

Can someone explain in layman term, why the transaction needs to be signed and the role of public key, private key in transaction signing process. From what I have read so far: When user creates a ...
7
votes
1answer
802 views

Is it possible to sign transactions offline in Mist?

is this planned to be implemented? Would be great to be able to sign transactions securely on an air-gapped machine. I understand that IceBox has offline signing, but they don't support contracts/...
7
votes
1answer
354 views

Can I compress a raw, signed transaction into 140 characters

I would like to basically Make SMS payments of Ether (or bitcoin). The basic Idea I'm thinking about is: 1) Private key signs a transaction on a mobile phone. 2) Raw transaction is 'compressed' ...
6
votes
3answers
4k views

Signing a raw transaction in Go

I need to sign an offline transaction in golang. I have the following, which is a slight modification of this answer to a similar question: import "github.com/ethereum/go-ethereum/core/types" import "...
6
votes
2answers
514 views

Issue while trying to verify signature

I am using the following to sign a message var str="Trial with signature"; text=web3.sha3(str); var sig=web3.eth.sign(eth.accounts[0],text); Now after obtaining the hash value from the text and ...
6
votes
1answer
737 views

How to sign a message using secp256k1 in Ruby?

I'm trying to write a sign function in Ruby for Ethereum using secp256k1. I have access to this sign_compact function which seems to be for Bitcoin: https://github.com/lian/bitcoin-ruby/blob/master/...
5
votes
1answer
3k views

What are the IDs for the various Ethereum chains? [duplicate]

I'm looking to find the chain ID's for each network (homestead, etc.). I believe the v-value of signatures is associated with these to some extent. I'm also under the impression that the ropsten ID ...
5
votes
2answers
2k views

smart contract transaction signature

I have a thought about the smart contract. I would like to know when the smart contract sends a transaction (send ether to someone) did it sign the transaction if yes how it does? does it have a ...
5
votes
1answer
4k views

Can I web3.eth.sign with private key

I want to use web3.eth.sign to create a signature that will be stored in blockchain and verified later by a contract (with ecrecover). I'd like to use as few libraries as possible. Web3 docs specify ...
5
votes
1answer
421 views

How are tuples handled for the function selector?

How are tuple types encoded into the function signature to generate the 4 byte function selector? The official specification doesn't state anything for tuple types.
5
votes
1answer
672 views

web3.eth.sign not returning a valid signature - Or how else does this work?

EDIT: Problem Solved; working example of login below I use the sha3 of a message I want to sign with eth.sign m = web3.sha3("Please work.") I then runeth.sign(eth.coinbase, m) And it returns me: ...
5
votes
1answer
1k views

How to get signature parameters from a transaction?

In my application I have to manually verify certain transaction signatures on the ethereum blockchain. Atm I am running geth and parity nodes and query transaction information via the rpc interface ...
5
votes
1answer
430 views

Signatures differ in web3js and web3j

I'm using web3J version 3.0.0-alpha4 and hit following problem. When I sign the same raw message (it's simply string like "TEST" for now) I get different signatures using web3js i web3j. The signature ...
4
votes
4answers
381 views

Get rid of Metamask sign confirmation dialog

I am using web3 for users to sign some random string from web application. I give user string, he/she signs it after Metamask dialog's "Sign" button. but there is a problem when i want user to sign ...
4
votes
3answers
1k views

Retrieve the signature of a transaction on the blockchain

How can you find the signature of a transaction? web3.eth.getTransaction() doesn't appear to make that available.
4
votes
1answer
403 views

Can a message hash be recovered from a signature?

A message can be signed and its signing public key recovered given the signature and message hash... signature = web3.personal.sign(<account>,<message hash>) pubKey = web3.personal....
4
votes
1answer
2k views

Verifying personal.sign signature with pyethereum

I'm trying to verify a signed message from Metamask with pyethereum. I can not seem to recover the correct address from the signature. Lack of documentation isn't helping matters. On the client ...
4
votes
1answer
1k views

Mobile app to sign tx of another app (similar to Metamask in browser)?

I am looking at an architecture of a native (this is given!) iOS app which I want to integrate with an external wallet. For web apps we have the beloved Metamask which takes care of signing txs. Since ...
4
votes
1answer
465 views

Verification of externally-created ECDSA signatures in Solidity

I have ECDSA signatures created using Golang without using web3 or anything related to Ethereum, and I want to verify these in Solidity. Step 1: Signing the message in Golang My Go code to create ...
4
votes
1answer
455 views

Why does a multisignature wallet in mist only require one signature?

I've created one new contract wallet from an account in mist and this account is supposed to required two signatures. When I test it to send some coins, it asks me to enter one password from one ...
4
votes
1answer
334 views

Verifying Bicoin signed message in Ethereum smart contract

I'd like to explore the option to verify the messages that have been signed in Bitcoin wallets in Ethereum smart contracts. Ethereum smart contract is given a list of Bitcoin addresses Ethereum smart ...
4
votes
1answer
406 views

Why is s in transaction signature limited to n/2+1

In the Yellow paper, appendix F "Signing Transactions", it says a valid signature must satisfy: (281) 0 < s < secp256k1n ÷ 2 + 1 However, in both the cited paper here (ECDSA SIGNATURE ...
4
votes
1answer
569 views

How can we verify BGLS aggregate signatures in Solidity?

BGLS [1] is an aggregate signature scheme by Boneh et al., that allows aggregation of signatures on n different messages from n different signers. What I want to achieve is to verify such signatures ...
4
votes
2answers
535 views

Sign transaction on ARM microcontroller

Is it possible to sign transaction on ARM Microcontroller and then somehow broadcast it? I have read about ethereumjs-tx, but how to implement it without any OS on board? UDPADE: I have found how to ...
4
votes
3answers
198 views

how do you sign transactions programatically?

imagine there's a dapp you're building and on your website users type the receiver address, the value and what you do is send from that user's address to the receiver's address the value ether. My ...
4
votes
0answers
280 views

Why are there discrepancies between client message signatures?

I have been investigating message signing using an Ethereum account, and have become somewhat bemused by the different signatures that I receive from different clients and different libraries. I have ...
4
votes
0answers
139 views

how to sign with the Ethereum private key and derive the the r, v, s it needs for verification [duplicate]

I know this kind of questions has been asked before, I want to know the detailed procedure to sign on msgs and derive the r, v, s(the command line), and the client and environment it needs to do the ...
4
votes
0answers
66 views

Possible to sign offline transactions with Geth? [duplicate]

I'd like to set up a cold storage wallet that has the ability to create and sign transactions offline. It seems both Icebox and ethkey has this functionality, but I'd prefer to have the option to ...
3
votes
4answers
887 views

Should UIs handle 4Byte signature collisions

With 4 bytes collissions are possible. But they are not very likely. Currently in the 6,846 signatures in the 4Byte.direcory there are no collisions. Still they are possible. Now I wonder if UIs ...
3
votes
2answers
2k views

Is it possible to sign a message in Solidity?

I am trying to sign and verify a signature in Solidity. I understood that it is possible to verify a signature using ecrecover. However, I am not able to find any useful information on signing.