An API / abstraction for managing libp2p public/private key pairs and identities
Libp2p uses cryptographic key pairs to sign & verify messages and derive unique peer identities (Peer ID's). This library wraps a public / private key pair in a PeerID object that exposes certain functionality for use with Libp2p nodes.
A Peer ID is the SHA-256 multihash of a public key.
The public key is a base64 encoded string of a protobuf containing an RSA DER buffer.
Include the following dependency in your Package.swift file
let package = Package( ... dependencies: [ ... .package(url: "https://github.com/swift-libp2p/swift-peer-id.git", .upToNextMajor(from: "0.0.1")) ], ... .target( ... dependencies: [ ... .product(name: "PeerID", package: "swift-peer-id"), ]), ... )
check out the tests for more examples
import PeerID /// Generate a new PeerID let peerID = try PeerID(.Ed25519) peerID.b58String // -> QmVJHUwJBshjMa7Ctngt34MXgXMTDeM5RjvgQNGqsiPLzB (libp2p PeerID standard) peerID.keyPair // Access to the underlying key pair peerID.keyPair?.keyType == .ed25519 // The type of Key peerID.keyPair?.privateKey // Access to the private key (for signing) peerID.keyPair?.publicKey // Access to the public key (for verifying signatures)
/// Initializers /// Generate a new PeerID with an underlying Key Pair (defaults to 2048 bit RSA) PeerID.init(_ keyType:LibP2PCrypto.Keys.KeyPairType = .RSA(bits: .B2048)) throws /// Use an existing Key Pair to instantiate a PeerID PeerID.init(keyPair:LibP2PCrypto.Keys.KeyPair) throws /// Inits a `PeerID` based solely on an ID value with no underlying `KeyPair` PeerID.init(fromHexID hex:String) throws /// Inits a `PeerID` based solely on an ID value with no underlying `KeyPair` PeerID.init(fromBytesID bytes:[UInt8]) throws /// Inits a `PeerID` from a v0 dag-pb or v1 libp2p-key CID complient string PeerID.init(cid:String) throws /// Inits a `PeerID` from a v0 dag-pb or v1 libp2p-key CID PeerID.init(cid:CID) throws /// Inits a `PeerID` from a marshaled `PeerID` string PeerID.init(marshaledPeerID:String, base: BaseEncoding? = nil) throws /// Inits a `PeerID` from a marshaled `PeerID` PeerID.init(marshaledPeerID data:Data) throws /// Inits a `PeerID` from a marshaled public key string PeerID.init(marshaledPublicKey str:String, base:BaseEncoding) throws /// Inits a `PeerID` from a marshaled public key PeerID.init(marshaledPublicKey key:Data) throws /// Inits a `PeerID` from a marshaled private key string PeerID.init(marshaledPrivateKey str:String, base:BaseEncoding) throws /// Inits a `PeerID` from a marshaled private key PeerID.init(marshaledPrivateKey data:Data) throws /// Properties /// Returns the PeerID's id as a base58 string (multihash/CIDv0). PeerID.b58String:String /// Returns the PeerID's id as a hex string. PeerID.hexString:String /// A base32 encoded, version 1 CID, representing this PeerID PeerID.cidString:String /// A simple way of checking a PeerID's type (id only, public key & id, or private key, public key and id) PeerID.type:PeerType /// Returns the id of this PeerID as bytes PeerID.bytes:[UInt8] /// Methods /// Returns a protocol-buffers encoded version of the id, public key and, if `includingPrivateKey` is set to `true`, the private key. PeerID.marshal(includingPrivateKey:Bool = false) throws -> [UInt8] /// Exports our PeerID as a JSON object PeerID.toJSON(includingPrivateKey:Bool = false) throws -> Data /// Exports our PeerID as a JSON string PeerID.toJSONString(includingPrivateKey:Bool = false) throws -> String? /// Signing and Verifying // Signs data using this PeerID's private key. This signature can then be verified by a remote peer using this PeerID's public key PeerID.signature(for msg:Data) throws -> Data // Using this PeerID's public key, this method checks to see if the signature data was in fact signed by this peer and is a valid signature for the expected data PeerID.isValidSignature(_ signature:Data, for expectedData:Data) throws -> Bool
Contributions are welcomed! This code is very much a proof of concept. I can guarantee you there's a better / safer way to accomplish the same results. Any suggestions, improvements, or even just critques, are welcome!
Let's make this code better together! 🤝
MIT © 2022 Breth Inc.