Crate khodpay_signing 

Khodpay Signing

EVM transaction signing library for BSC (BNB Smart Chain) and other EVM-compatible chains.

This crate provides EIP-1559 (Type 2) transaction signing, integrating with khodpay-bip44 for HD wallet key derivation.

Features

• EIP-1559 Transactions: Modern fee market transactions
• BSC Support: Native support for BNB Smart Chain (mainnet/testnet)
• BIP-44 Integration: Seamless key derivation from HD wallets
• BEP-20 Helpers: Token transfer encoding utilities

Quick Start

use khodpay_signing::{Eip1559Transaction, ChainId, Wei, Bip44Signer};
use khodpay_bip44::{Wallet, Purpose, CoinType, Language};
use khodpay_bip32::Network;

// Create wallet and get account
let mnemonic = "your twelve word mnemonic phrase here";
let mut wallet = Wallet::from_mnemonic(mnemonic, "", Language::English, Network::BitcoinMainnet)?;
let account = wallet.get_account(Purpose::BIP44, CoinType::Ethereum, 0)?;

// Create signer
let signer = Bip44Signer::new(account, 0)?;

// Build transaction
let tx = Eip1559Transaction::builder()
    .chain_id(ChainId::BscMainnet)
    .nonce(0)
    .to("0x...".parse()?)
    .value(Wei::from_ether(1))
    .gas_limit(21000)
    .max_fee_per_gas(Wei::from_gwei(5))
    .max_priority_fee_per_gas(Wei::from_gwei(1))
    .build()?;

// Sign and get raw transaction
let signed = signer.sign_transaction(&tx)?;
let raw_tx = signed.to_raw_transaction();

Structs

AccessListItem

An access list item specifying an address and its storage keys.

Address

A 20-byte EVM address.

Bip44Signer

A transaction signer using BIP-44 derived keys.

Eip1559Transaction

EIP-1559 (Type 2) transaction.

Eip1559TransactionBuilder

Builder for constructing EIP-1559 transactions.

Signature

An ECDSA signature with recovery ID.

SignedTransaction

A signed EIP-1559 transaction ready for broadcast.

Wei

A value in wei (smallest EVM currency unit).

Enums

ChainId

EVM chain identifier for transaction replay protection.

Error

Errors that can occur during transaction signing operations.

Constants

ETHER

The number of wei in one ether/BNB (10^18).

GWEI

The number of wei in one gwei (10^9).

TOKEN_TRANSFER_GAS

Typical gas limit for a BEP-20/ERC-20 token transfer.

TRANSFER_GAS

Gas limit for a standard ETH/BNB transfer.

Functions

recover_signer

Recovers the signer’s address from a signature and message hash.

Type Aliases

AccessList

A list of access list items.

Result

Result type alias for signing operations.