How to sign a transaction in Rust SDK?

mpoplavkov · December 13, 2023, 6:40pm

Related to How to build a transaction without signatures in Rust SDK?.

Given an instance of Transaction, how to sign it with a private key?

FuelLabs/fuel-vm/blob/master/fuel-tx/src/transaction.rs#L87-L91


      
          pub enum Transaction {
              Script(Script),
              Create(Create),
              Mint(Mint),
          }

I only see the way of signing a transaction using transaction builder, but I cannot use the builder, since I already have a built transaction.

github.com

FuelLabs/fuels-rs/blob/d809a24597af277de503abbc1afc7ca25ce31c95/packages/fuels-accounts/src/wallet.rs#L258-L260


      
          fn add_witnessses<Tb: TransactionBuilder>(&self, tb: &mut Tb) {
              self.sign_transaction(tb);
          }

calldelegation · December 23, 2023, 5:33pm

Hey @mpoplavkov build_without_signatures in the transaction builder is introduced in the PR here.

github.com/FuelLabs/fuels-rs

feat: add `build_without_signatures` to `TransactionBuilder`

FuelLabs:master ← FuelLabs:hal3e/build-without-signatures

opened 01:05PM - 18 Dec 23 UTC

hal3e

+277 -64

This PR adds the ability to build transaction without signatures. This is useful… if the user wants to estimate costs or wants to simulate the TX on a node without setting the right signatures. Changes: - Added a new method called `build_without_signatures(provider: &impl DryRunner)` to `TransactionBuilders` - Added `sign_built_transaction(...)` to wallet - `fee_checked_from_tx` now builds without signatures which means we can use `adjust_for_fee` without signing first cc @MujkicA - Added documentation NOTE: If the user builds without signatures, it is their responsibility to sign the transaction in the right order. For example, if we have `CoinSignedA` then `CoinSignedB`, we need to sign with `WalletA` and then with `WalletB`. This comes from the fact that we need to set the witness indexes while building the transaction. ### - [x] I have updated the documentation. - [x] I have added tests that prove my fix is effective or that my feature works. - [x] I have added necessary labels. - [x] I have done my best to ensure that my PR adheres to [the Fuel Labs Code Review Standards](https://github.com/FuelLabs/rfcs/blob/master/text/code-standards/external-contributors.md). - [x] I have requested a review from the relevant team or maintainers.

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How to sign a transaction in Rust SDK?

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