Example usage

// This is a database of users, along with their salted verification keysletuserStore:[String:(salt:Data, verificationKey:Data)]=["alice":createSaltedVerificationKey(username:"alice", password:"password123"),"bob":createSaltedVerificationKey(username:"bob", password:"qwerty12345"),]// Alice wants to authenticate, she sends her username to the server.letclient=Client(username:"alice", password:"password123")let(username, clientPublicKey)= client.startAuthentication()letserver=Server(    username: username,    salt:userStore[username]!.salt,    verificationKey:userStore[username]!.verificationKey)// The server shares Alice's salt and its public key (the challenge).let(salt, serverPublicKey)= server.getChallenge()// Alice generates a sessionKey and proofs she generated the correct// session key based on her password and the challenge.letclientKeyProof=try client.processChallenge(salt: salt, publicKey: serverPublicKey)// The server verifies Alices' proof and generates their proof.letserverKeyProof=try server.verifySession(publicKey: clientPublicKey, keyProof: clientKeyProof)// The client verifies the server's proof.try client.verifySession(keyProof: serverKeyProof)// At this point, authentication has completed.assert(server.isAuthenticated)assert(client.isAuthenticated)// Both now have the same session key. This key can be used to encrypt// further communication between client and server.assert(server.sessionKey== client.sessionKey)

Swift Compatibility

Compatibility with other implementations

Development

Testing

swift test -c release -Xswiftc -enable-testing

References

Credits