BLSCT

An implementation of BLSCT in Swift. BLSCT is a privacy protocol developed by Navcoin, which merges Boneh-Lynn-Shacham (BLS) Signatures and Confidential Transactions (CT). BLSCT transactions are currently not supported, but will be added in a future release.

Platforms

• macOS 11+
• iOS 14+

Installation

Swift Package Manager

Add the following line to your Package.swift file:

.package(url: "https://github.com/anquii/BLSCT.git", from: "1.0.0")

...or integrate with Xcode via File -> Swift Packages -> Add Package Dependency... using the URL of the repository.

Usage

import BLSCT

// Private BLS keys
let mclPreparator: MCLPreparing = MCLPreparator()
let privateBLSKeyDerivator: PrivateBLSKeyDerivating = PrivateBLSKeyDerivator()
let privateBLSMasterKeyDerivator: PrivateBLSMasterKeyDerivating = PrivateBLSMasterKeyDerivator(privateBLSKeyDerivator: privateBLSKeyDerivator)
let privateBLSChildKeyDerivator: PrivateBLSChildKeyDerivating = try PrivateBLSChildKeyDerivator(privateBLSKeyDerivator: privateBLSKeyDerivator, mclPreparator: mclPreparator)
let privateBLSKeysDerivator: PrivateBLSKeysDerivating = PrivateBLSKeysDerivator(privateBLSMasterKeyDerivator: privateBLSMasterKeyDerivator, privateBLSChildKeyDerivator: privateBLSChildKeyDerivator)
let privateBLSKeys = try privateBLSKeysDerivator.privateKeys(base58CheckEncodedPrivateMasterKey: "xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jPPqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi") // (privateBLSViewKey, privateBLSSpendKey, privateBLSBlindingKey)

// Public BLS keys
let publicBLSKeysDerivator: PublicBLSKeysDerivating = try PublicBLSKeysDerivator(privateBLSViewKey: privateBLSKeys.privateBLSViewKey, privateBLSSpendKey: privateBLSKeys.privateBLSSpendKey, mclPreparator: mclPreparator)
let publicBLSKeys = try publicBLSKeysDerivator.publicKeys(accountIndex: 0, subAddressIndex: 0) // (publicBLSViewKey, publicBLSSpendKey)

// Address
let addressCoder: AddressCoding = AddressCoder()
let address = addressCoder.address(publicBLSViewKey: publicBLSKeys.publicBLSViewKey, publicBLSSpendKey: publicBLSKeys.publicBLSSpendKey)
// e.g. xNVM1yykP9cSc737VCMzP8kWR77gPn1iujPitHRm6urfrVRDLbNinxsRTZb3CCsYCD3Uqj3RCQubEYaHj3XKmGMbFTDctT2JVJ6CCazXomPmoiPGB3qf8rfKp7NEyzKupjeSD4CfkKS

Find out more by exploring the public API, and by looking through the tests. If you're creating a wallet, make sure to store the publicBLSSpendKey alongside the integer pair (accountIndex, subAddressIndex) used as part of its derivation (as documented here).

License

BLSCT is licensed under the terms of the MIT license. See the LICENSE file for more information.