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Questions tagged [signature]

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72 views

How to make ECDSA signature of (value_1, value_2) with web3 on Python?

I want to call function with four parameters. I know how to create two of them, but the last two is the r and s components of ECDSA signature of (param_1, param_2). I tried this (and a lot of ...
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1answer
40 views

Is S of the signature(R,S) invalid when it is larger than N/2 in Ethereum? [duplicate]

In ECDSA, both signature(r,s) and (r,-s) are valid. However, in Bitcoin, it seems that the signature fails to be verified when s-part in the signature is bigger than half of the group order from this ...
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1answer
168 views

How do I extract the v, r, s values from a signed transaction

If I have a signed transaction such as ...
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31 views

Why is ethereum not using threshold signatures like dfinity for randomness? What's the drawback?

So ethereum goes for RANDAO. The disadvantage with randao is that the last validator in the commit-reveal scheme is able to hold his contributed value back and thereby influence the random outcome. ...
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94 views

Use Web3 to recover address from message signed by ethers.js?

On the client we are using ethers: const signingKey = new ethers.utils.SigningKey(privateKey) const message = Date.now() const messageBytes = ethers.utils.toUtf8Bytes(String(message)) const ...
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1answer
28 views

how can a signature for a document on a blockchain be revoked?

I am trying to do document verification through blockchain. The way I'm trying to do this is by digitally signing a document, and storing its hash on the blockchain. Now I'm trying to create a feature ...
1
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1answer
108 views

web3js recover returns different address than what signed message

Web3js as of version 1.0.0 beta supports an interface for verifying signed messages: https://github.com/ethereum/web3.js/issues/404 This is documented here: https://web3js.readthedocs.io/en/1.0/web3-...
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1answer
54 views

How can Contracts sign transactions, when they dont have a private key?

When transactions are made the sender is identified by his signature. But Contracts dont have a private key to sign any transaction or message. So I have some questions: Can a Contract initiate a ...
2
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1answer
206 views

Signing meesage | hex string has length 64, want 40 for common.Address

I am using 'web3.eth.sign` to sign a message, using following code snippet: web3.eth.sign(msgHash, address, async (err, signedMsg) => { if(err) { console.log(err) resolve(false) } else ...
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0answers
895 views

The object could not be cloned. && DOMException: Failed to execute 'postMessage' on 'Window'

When I try to sign a message with this simple function const signatue = await window.web3.eth.sign(hash, userAddress) I get an error. In firefox I get Unhandled promise rejection DOMException: "The ...
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0answers
68 views

Ecrecover wrong address is returned

I'm trying to validate signed data with ecrecover. The message is signed like this on the FE: return this.web3.eth.personal.sign( `${nonce}`, publicAddress ).then( ( signature ) => { ...
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110 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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2answers
38 views

Is there any command-line tool to sign transactions offline on a Linux machine?

I have an air-gapped machine with Ubuntu Server. Is there any command line tool which I can quickly download to sign offline transactions? Something like: sign-tx private_key_file nonce=10 gasPrice=.....
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894 views

TypeError: Cannot read property 'slice' of undefined

web3.eth.accounts.signTransaction(transactionObject, process.env.WALLET_PRIVATE_KEY, function (error, signedTx) { if (error) { log(`${error}`.red); } else { web3.eth....
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49 views

Automatic sign of Transaction

Is there any secure solution(without exposing a Private key of the user) to automatically sign transactions, which are requested from a DApp, so that user doesn't have to sign each of them manually? I ...
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32 views

In ethereumj, why the signature use loop to get v?

In the java version of Ethereum, I see the signature code as follows: public ECDSASignature sign(byte[] messageHash) { ECDSASignature sig = doSign(messageHash); // Now we have to work ...
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2answers
97 views

Why does ecrecover() take signature parameters (v,r,s) instead of the full signature?

Is there any reason ecrecover() takes the (v, r, s) signature parameters instead of the full signature, given that these can be easily computed inside the function itself? I am asking because ...
2
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1answer
242 views

Recovering address (web3.eth.accounts.recover) does not return the address of message signer

I am writing a test for a function in my smart contract which attempts to verify that a message comes from the signer. I'm currently using web3.eth.accounts.sign to sign my message with the sender ...
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116 views

Ethereum Signature Information

I am currently working with Ethereum Signatures (ECDSA and r, s ,v values) and I'm looking for official information about the recovery id v. A few posts like this one explain how the calculation is ...
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0answers
26 views

How to change prefix of signature in Javascript?

Is it possible to change the signature prefix, which by default: "\x19Ethereum Signed Message:\n32" Can I change it to another prefix? I need to get a signature in solidity in this way: bytes32 ...
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0answers
65 views

Truffle test to verify events can be queried by the address of the signing user?

I'm trying to write a test which verifies I can query a given type of events by the user/address which sign them. I would like to apply TDD (relevant to say I haven't made the implementation for this ...
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1answer
42 views

What should we do if s in the ecdsa signature is greater than n/2?

What should we do if s in the ecdsa signature is greater than n/2? As we all know, in the ECDSA signature of Ethernum, the output s must be smaller than n/2, where s is the signature output and n is ...
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1answer
109 views

Signed Message Verification failing for signed messages with multiple passes

I'm using web3 to verify signed messages using the code below: web3.eth.accounts.recover(message, signature); I'm testing against the list of publicly verified signatures on EtherScan - https://...
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1answer
385 views

Retrieve public key and check the signature with web3

I create a transaction with signTransaction and I have an output like this: "signedTx": { "messageHash": "0x..", "v": "0x..", "r": "0x..", "s": "0x..", "rawTransaction": "0x....." ...
2
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1answer
734 views

Understanding Ethereum signatures

I would like to understand exactly which signatures are used in the Ethereum. Here https://bitcoin.stackexchange.com/questions/12554/why-the-signature-is-always-65-13232-bytes-long it says that there ...
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1answer
118 views

Sign message (obtain v,r,s) inside Solidity

I'm trying to call an Exchange SmartContract which is POORLY designed/implemented and forces you to sign your own parameters instead of using msg.sender (and provides no alternative). <-- I've just ...
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2answers
152 views

eth.sign() method giving error

I am using eth.sign from Ethereum wallet developer terminal and getting following error rejection Error: Returned Error: The method eth_sign does not exist/is not available Please advise whats the ...
1
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1answer
394 views

Invalid sender when sending Raw Transaction, signed w/ ethereum-tx on PHP

I am using PHP and ethereum-tx library https://github.com/web3p/ethereum-tx to sign transactions but when trying to send them to the node I got an "invalid sender" error. Besides, exactly the same ...
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2answers
397 views

Signing legal smart contracts

In "conventional", physical legal contracts, parties usually sign them with a handwritten/electronic/digital signature, depending on the form of the contract. But as legal smart contracts are ...
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2answers
43 views

Why ethereum dons't store transaction signature? [duplicate]

Ethereum doesn't store transaction signature (r,s,v) in its tries. The first answer in that it is state-based, not UTXO based: Retrieve the signature of a transaction on the blockchain But there is ...
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51 views

Controlling access to functions with VIEW visibility with signed transactions?

Controlling access to functions that require ETH is straight forward because you get an address you can trust because it has been signed and verified, and therefore upi can use for access control ...
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0answers
128 views

web3 recover address from signature signed by digital bitbox

I use digital bitbox to sign some data and would like to use web3.js to recover the account address. Following https://web3js.readthedocs.io/en/1.0/web3-eth-accounts.html#recover I couldn't ...
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0answers
35 views

Why is an ephemeral key used in creating a digital signature?

When creating the 'S' component of a digital signature, both the actual private key and an ephemeral private key are used. The reasoning I've read is to ensure that the sender’s actual private key ...
0
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2answers
167 views

avoid replay attacks on signing on smart contracts

the scenario: a user has a privatekey and wants to sign something to send to the contract ex: the user send his (message,signature,publickey) to the contract and the contract can verify it with the ...
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1answer
32 views

Power of signing transactions and what you can do with that

I have been playing around with state channels and am starting to see the power of signing information/transactions, but haven't got a completely clear idea of what I can do with them. I think I can ...
2
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1answer
2k views

How to get private keys on Truffle from Ganache accounts

Doing some ERC-735 tests on truffle+ganache I got stuck when creating claim signatures. They need to be signed from my ganache account, but I don't know its private key. The code to be used is this: ...
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1answer
492 views

Signing a transaction: What is actually signed? [noob question]

I'm trying to wrap my head around how signing transactions actually works. As I understand ECDSA signatures roughly work like this: There is a magic function, let's call it sign that takes two ...
1
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1answer
222 views

web3py: get public key from transaction

I'm trying to retrieve the public key of an address from a transaction. I'm getting the transaction via tx = web3.eth.getTransaction('xxx') According to the docs the public key should be retrievable ...
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2answers
116 views

Different Values for v, r, s? What am I doing wrong?

lets assume I have this private key (test account on ropsten, no need to worry): 785cdcd731a1b2438ec4511a25d04efbdc499ed350df612364af1aa6f4fd6abd When I use Pyethereum to run v, r, s = ecsign(tx['...
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1answer
88 views

Facing an issue in transaction signature generation using a C library

I'm trying to generate a signature for a raw transaction using an ECDSA library implemented in C. Here are the transaction parameters: const txParams = { "nonce": "0x05", "gasPrice": "...
3
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0answers
585 views

Verify Public Key from an RSA SHA256 signature

Given an RSA SHA256 signature (obtained from encrypting a hash using an RSA Private Key), I must assert whether a provided Public Key matches this signature or not. It is imperative that this ...
3
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1answer
457 views

Does Ethereum support pairing operations?

I need to build an application that uses bilinear pairing operations for generating signatures. If I send a message with its signature to Ethereum, can Ethereum verify this message? Does the EVM ...
4
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3answers
196 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 ...
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1answer
299 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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4answers
378 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 ...
0
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1answer
225 views

Can smart contracts make transactions on behalf of the caller?

I want to make a smart contract that wraps over other various smart contracts. In some of these contracts the user needs to send the transaction themselves. Is it possible to make a smart contract ...
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1answer
237 views

Why doesn't my contract call create a new transaction in my ganache transaction section?

goes easy on me because I'm quite new to all of this stuff. So I've created a function which signs my transaction using web3js library and looks like this: signTx = async () => { const { ...
2
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1answer
184 views

Invalid transaction signature on sending transaction

Hello guys I'm having a "Invalid transaction signature." error. Can't get pass this one. Am I missing something? client, err := ethclient.Dial("path/to/geth.ipc") if err != nil { return err } ks :...
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1answer
319 views

generating raw trx and sending it to the network shows “invalid sender” error

I'm trying to make an ethereum raw transaction by php and these libraries: https://github.com/simplito/elliptic-php https://github.com/kornrunner/php-keccak https://github.com/web3p/rlp this is my ...
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1answer
451 views

generate v parameter in ethereum transaction

I'm trying to generate ethereum raw transactions. this is keccak hash of my transaction: f2ad2e2b6f398f76df2f5adacc84e39e926871bd2f82a3055319f8d4f4eeb8ce after signing it with my private key I ...