Ethereum Key Manager written in Swift
Dawn Key Management
The Dawn Wallet Key Management repo provides a new API that allows you to manage, create, encrypt wallets and sign transactions on Ethereum. This package leverages the Secure Enclave to keep your keys protected, by using a secret in the Secure Enclave to encrypt a user private key.
Installation
Swift Package Manager
To integrate this package into your Xcode project using Swift Package Manager, add it to the dependencies value of your Package.swift:
dependencies: [
.package(url: "https://github.com/dawnwallet/dawn-key-management", branch: "main")
]
Usage
Wallet
EthereumWallet object is used to describe a standard wallet.
Representation
Create a new instance by injecting the EthereumPrivateKey.
let privateKey = EthereumPrivateKey(rawBytes: [])
let standardWallet = EthereumWallet(privateKey: privateKey)
Encryption
The following method encrypts the wallet using a secret generated in the secure enclave, the resolved ciphertext is stored in the Keychain. It returns the wallet in case no error is thrown.
standardWallet.encryptWallet()
Account
The EthereumAccount object is used to perform crypto operations over the encrypted wallet. In order to have full access to its capabilities, the injected address should have been previously encrypted.
Representation
Create a new instance by injecting the EthereumAddress.
let address = EthereumAddress(hex: "0x7851b240aCE79FA6961AE36c865802D1416611e7")
let account = EthereumAccount(address: address)
Signature
It resolves a signature given the digest. You may only sign digests if the address injected has been encrypted before. If not, a notImported error will be thrown.
account.signDigest([])
Decryption
It decrypts the privateKey, and returns the closure containing its reference.
account.accessPrivateKey { privateKey in }
HD Wallet
HDEthereumWallet object is used to describe a Hierarchical deterministic Wallet.
Representation
From mnemonic
Return the HD Wallet with the given mnemonic string.
let hdWallet = HDEthereumWallet(mnemonicString: "test test test")
Generate
Generate a new HD Wallet with the desired length.
let hdWallet = HDEthereumWallet(length: .word12)
Encryption
Encrypt the mnemonic, and return the Id used as reference.
let id = hdwallet.encryptSeedPhrase()
Derivation
It decrypts the seed phrase, generates an account at the indicated index, and returns the generated private key.
HDEthereumWallet.generateExternalPrivateKey(id: "E621E1F8-C36C-495A-93FC-0C247A3E6E5F", index: UInt32(0)) { privateKey in }
Decryption
It decrypts the seed phrase, and returns the closure containing its reference.
HDEthereumWallet.accessSeedPhrase(id: "E621E1F8-C36C-495A-93FC-0C247A3E6E5F") { seedPhrase in }
Acknowledgements
In part based on the key manager written at Light Wallet (https://github.com/LightDotSo/Wallet).
License
GPL-3.0 license