go-eth | ethreum client and other crypto functions | Cryptography library

by sc0Vu Go Version: Current License: MIT

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | go-eth Summary

go-eth is a Go library typically used in Security, Cryptography, Ethereum applications. go-eth has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

Test the usage of ethreum client and other crypto functions you'll need when develop dapp in go .

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Quality

Security

License

Reuse

Support

go-eth has a low active ecosystem.

It has 6 star(s) with 4 fork(s). There are 1 watchers for this library.

It had no major release in the last 6 months.

There are 1 open issues and 2 have been closed. On average issues are closed in 487 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of go-eth is current.

Quality

go-eth has no bugs reported.

Security

go-eth has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

go-eth is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

go-eth releases are not available. You will need to build from source code and install.

Top functions reviewed by kandi - BETA

kandi has reviewed go-eth and discovered the below as its top functions. This is intended to give you an instant insight into go-eth implemented functionality, and help decide if they suit your requirements.

Generate transaction
makeTxOpts returns a bind . TransactOpts object suitable for signing .
fetchBlockNumber returns the block number for the given token .
DeployContract deploys a new contract
NewMessage returns a new message .
Connect connects to a remote host
bindContract binds a contract to a bound .
NewContractTransactor returns a new instance of ContractTransactor bound to a specific deployed contract .
bindContractWithABI binds a contract to a contract .
NewContractWithABI creates a new contract with the given string representation .

Get all kandi verified functions for this library.

go-eth Key Features

No Key Features are available at this moment for go-eth.

go-eth Examples and Code Snippets

No Code Snippets are available at this moment for go-eth.

Community Discussions

Trending Discussions on go-eth

how does ethereum web3js imports "crypto-js"?

Command that works in terminal doesn't work with go exec.Command

Parse Ethereum private key in string in Go

How to generate the ECDSA public key from its private key?

What is the best local structure for Go open source repository development?

Go : 'use of internal package not allowed ' when running a Go project forked from a GitHub repository

Sending signed transactions to Ropsten

eth.estimateGas fails with contract address as second parameter

I get undefined ethclient when executing main.go

Golang Interpret gdb SIGILL, Illegal Instruction

QUESTION

how does ethereum web3js imports "crypto-js"?

Asked 2021-Apr-16 at 20:42

I am a bit confused by the syntax used in the web3.js file of the ethereum repository, although there is no file named crypto-js nor any npm or yarn, how is this import is being done? https://github.com/ethereum/go-ethereum/blob/master/internal/jsre/deps/web3.js#L1828

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ANSWER

Answered 2021-Apr-11 at 11:02

The javascript file you're looking at (web3.js) is the result of web3's build, i.e., a browserify bundle of the whole web3 project and its dependencies. The entire crypto-js library from npm is bundled in that file - that's why there's no other references to crypto-js within the go-ethereum project. Let's take a look at the object containing the code you've linked, which looks something like this:

Source https://stackoverflow.com/questions/66964892

QUESTION

Command that works in terminal doesn't work with go exec.Command

Asked 2021-Mar-05 at 13:54

I'm trying to attach to a go-ethereum node from a go script:

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ANSWER

Answered 2021-Mar-05 at 06:11

From the os/exec documentation:

Unlike the "system" library call from C and other languages, the os/exec package intentionally does not invoke the system shell and does not expand any glob patterns or handle other expansions, pipelines, or redirections typically done by shells.

Since the arg ...string parameter of exec.Command() isn't processed by a shell, each argument is handed to the command exactly as specified. In your case, the entire content of metaData is provided to geth as a single argument.

You should instead create a slice of strings, each containing a single argument. And then provide that slice as the arg parameter using the ... notation.

Here's an example demonstrating this, using the uname command:

Source https://stackoverflow.com/questions/66487213

QUESTION

Parse Ethereum private key in string in Go

Asked 2020-Dec-30 at 16:42

I am trying really hard to convert Ethereum private keys BIP44 in string format to a type that can (*ecdsa.PrivateKey) be used by rest of the code.

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ANSWER

Answered 2020-Dec-30 at 16:42

Here is how a private key can be converted to Ethereum address You need to import one additional package "crypto/ecdsa" and also remove "0x" from the private key.

Source https://stackoverflow.com/questions/65507396

QUESTION

How to generate the ECDSA public key from its private key?

Asked 2020-Feb-25 at 20:24

The following site is frequently referenced and, I assume, accurate:

https://gobittest.appspot.com/Address

I'm trying to repro these steps in Golang but failing at the first step :-(

Is someone able to provide me with a Golang snippet that, given a ECDSA private key, returns the public key? I think I may specifically mean the private key exponent and public key exponent per the above site's examples.

i.e. given e.g. a randomly-generated (hex-encoded) private key (exponent?) E83385AF76B2B1997326B567461FB73DD9C27EAB9E1E86D26779F4650C5F2B75 returns the public key 04369D83469A66920F31E4CF3BD92CB0BC20C6E88CE010DFA43E5F08BC49D11DA87970D4703B3ADBC9A140B4AD03A0797A6DE2D377C80C369FE76A0F45A7A39D3F

I've found many (relevant) results:

https://crypto.stackexchange.com/questions/5756/how-to-generate-a-public-key-from-a-private-ecdsa-key

But none that includes a definitive example.

Go's crypto/ecdsa module allows keys to generated and includes a Public function on the type but this returns the PublicKey property.

Alternative ways that start from a private key appear to require going through a PEM-encoded (including a DER-encoded ASN) form of the key which feels circuitous (and I would need to construct).

Update:

See the answers below: andrew-w-phillips@ and kelsnare@ provided the (same|correct) solution. Thanks to both of them!

For posterity, Bitcoin (and Ethereum) use an elliptic curve defined by secp256k1. The following code from andrew-w-phillips@ and kelsnare@ using Ethereum's implementation of this curve, works:

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ANSWER

Answered 2020-Feb-25 at 07:50

After reading the answer by Andrew W. Phillips and a little help from https://github.com/bitherhq/go-bither/tree/release/1.7/crypto

Source https://stackoverflow.com/questions/60385053

QUESTION

What is the best local structure for Go open source repository development?

Asked 2019-Dec-31 at 18:12

I'm trying to debug Go implementation of ethereum(link), because my core interest is in developing new consensus algorithm (i.e. modify the open source Go code from github).

However, I'm having problem with the location/path of the source code. When I put the folder(i.e. go-ethereum) outside of the $GOPATH and then try to compile&debug geth(go-ethereum/cmd/geth/main.go) it shows the following error: Use of internal package is not allowed.

From that error message, I figured out that the import github.com/ethereum/go-ethereum was not importing my source, and instead it was getting code from internet(like other libraries). Which of course is definitely what I shouldn't do when I'm trying to modify the github.com/ethereum/go-ethereum package code.

So, my workaround was to clone the source code into $GOPATH/src/github.com/ethereum/go-ethereum and followed this answer, and Goland IDE started compiling&debugging without error (wasn't able to go build ./cmd/geth/main.go though due to error undefined: configFileFlag...)

Thereby now I've got a working debugger that can debug with my source code modification, but this doesn't look like ideal source code structure.

The question is:

Is putting source code inside $GOPATH(because of internals) a proper approach? If so, what if I was using go-ethereum package from another project?(Fortunately I'm not, but I'm curious) Do I have to stash&revert changes I made to the code?

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ANSWER

Answered 2019-Jul-16 at 02:22

Yes, the folder structure you ended up with is the right one.

Code should be under $GOPATH/src as you describe.

But note that $GOPATH is not a fixed folder in your system, you can have multiple projects under different folders and change the value of $GOPATH accordingly depending what you are working on (or have multiple console terminals open, each with its own $GOPATH value).

Source https://stackoverflow.com/questions/57049048

QUESTION

Go : 'use of internal package not allowed ' when running a Go project forked from a GitHub repository

Asked 2019-Dec-03 at 08:35

I'm getting used to Go, and trying to understand how it works.

So I'm trying to run the test code from my repository zoonoo/go-ethereum, forked from the original repository ethereum/go-ethereum.

When I run go test . under the eth directory, I get the following error :

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ANSWER

Answered 2017-Oct-21 at 06:38

As illustrated in another Go project:

Cloning a fork
If you wish to work with fork of InfluxDB, your own fork for example, you must still follow the directory structure above. But instead of cloning the main repo, instead clone your fork. Follow the steps below to work with a fork:

Source https://stackoverflow.com/questions/46860546

QUESTION

Sending signed transactions to Ropsten

Asked 2019-Jul-16 at 17:53

It's easy to use web3js to call functions that don't require signing (e.g. functions that do not update the state of a contract). However, it's not clear how to call functions that require signing, other than manually unlocking my MetaMask wallet and calling functions inside Remix environment.

After deploying my dapp for the first time to Ropsten, I need to call createItem(string name, uint price) 100 times to populate the items array initially. Since I don't want to do it manually in Remix, I want to write a script that does it automatically.

It looks like I need to have ethereumjs-tx in addition to web3js to sign transactions programatically without having MetaMask. I also need to have my account and privateKey. With all this information and the official web3js doc, I come up with the following:

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ANSWER

Answered 2018-Feb-18 at 21:28

Generally looks correct. The only question I would have is how are you planning on loading the private key? You will either need to prompt for the private key, or import/read in the keystore and prompt for the password. You can use keythereum to accomplish this (See the key import section for example code).

The nonce is just an incremental number used to order transactions for an account. To get the correct value, simply use web3.eth.getTransactionCount(account)

EDIT - Example run using Ganache with locked accounts (--secure option):

SimpleContract.sol

Source https://stackoverflow.com/questions/48838899

QUESTION

eth.estimateGas fails with contract address as second parameter

Asked 2019-Jul-04 at 17:59

Newbie. There is a go-ethereum method:

eth.estimateGas({from:'firstAccount', to:'secondAccount'})

that works well, but same method with contract address like:

eth.estimateGas({from:'firstAccount', to:'contractAddr'})

fails with error

gas required exceeds allowance or always failing transaction

I have looked into go-ethereum source code and it has the line, that contains proposal to use contract address as second parameter: https://github.com/ethereum/go-ethereum/blob/master/accounts/abi/bind/base.go#L221

The question is: is there any possibily to use eth.estimateGas with contract address as second parameter and how to avoid above error? Thank you.

...

ANSWER

Answered 2018-Apr-08 at 20:48

You're not specifying what you're executing in the contract, so there's nothing to estimate. When you estimateGas for a transfer to an EOA account, there is no contract code to execute, so there is no message data to be sent as part of the transaction object. If you're estimating gas on a contract call, you need to include the data for the contract.

For example, if you want to estimate gas to setValue(2) method in this contract

Source https://stackoverflow.com/questions/49719339

QUESTION

I get undefined ethclient when executing main.go

Asked 2019-Jun-12 at 22:58

I'am writting a script to interrract with a smart contract:

...

ANSWER

Answered 2019-Jun-12 at 11:08

You're not importing packages your code is using.

Add import "github.com/ethereum/go-ethereum/ethclient"
I am not sure where common package should be, but you're missing import for it as well.

Source https://stackoverflow.com/questions/56560253

QUESTION

Golang Interpret gdb SIGILL, Illegal Instruction

Asked 2019-May-14 at 17:23

I've written a small go program to be run on a MIPS 32-bit router. I'm able to get a basic hello world program running on the router using the go build toolchain.

...

ANSWER

Answered 2019-May-14 at 17:23

I'm unsure how to interpret this

Google for "MIPS sdc1" shows that this is a floating-point "Store Doubleword from Coprocessor-1" instruction.

A guess: your embedded system doesn't have a floating-point co-processor?

You would likely need to add -msoft-float to your xgo command and rebuild.

Update:

it is crashing on the same sdc1 call, the registers are the same $f20,56(a0).

Yes, but is in the same function (__sigsetjmp_aux), or in some different one?

Here is the call I'm building with xgo: xgo --go=1.12 --targets=linux/mips --ldflags '-extldflags "-static -msoft-float"' ~/path/to/project

It looks like the routine __sigsetjmp_aux is coming from GLIBC, which is not built by xgo.

And the version of GLIBC you are using was built without -msoft-float, so you are still linking in the code that expects hardware floating point, that your system lacks.

Step 1: verify where __sigsetjmp_aux is coming from. To do so, you need to pass -y __sigsetjmp_aux to the linker. Maybe --ldflags '-extldflags "-static -msoft-float -Wl,-y,__sigsetjmp_aux"' will do that.

You should see something similar to this:

Source https://stackoverflow.com/questions/56066799

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install go-eth

You can download it from GitHub.

Support

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