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Secure Remote Password (SRP) for Swift
.package(url: "https://github.com/Bouke/SRP.git", from: "3.2.1")

Secure Remote Password (SRP) for Swift

Secure Remote Password is a authentication protocol to prove your identity to another party, using a password, but without ever revealing that password to other parties. Not even the party you are proving your identity. See Secure Remote Password protocol for more information on this protocol.

CI status

Example usage

// This is a database of users, along with their salted verification keys
let userStore: [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.
let client = Client(username: "alice", password: "password123")
let (username, clientPublicKey) = client.startAuthentication()

let server = 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.
let clientKeyProof = try client.processChallenge(salt: salt, publicKey: serverPublicKey)

// The server verifies Alices' proof and generates their proof.
let serverKeyProof = 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.

// 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)

More information can be found in the documentation.

Swift Compatibility

Swift 4 is required with version 3 of this package. Use version 2 if you need Swift 3 compatibility.

Compatibility with other implementations

I like to believe this implementation correctly implements the RFC. However not all implementations do and might result in not being able to authenticate accross implementations. And subtle differences might result in low failure rates due to the randomness this protocol includes.

  • Python: ❌ srp is not compatible; it doesn't correctly calculate k.
  • Python: ✅ srptools is compatible.



This project includes unit tests. A few compiler flags are required to run the tests swiftly:

swift test -c release -Xswiftc -enable-testing



This library was written by Bouke Haarsma.


Stars: 38
Last commit: 2 weeks ago

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iOS Software Engineer @ Perry Street Software
Perry Street Software is Jack’d and SCRUFF. We are two of the world’s largest gay, bi, trans and queer social dating apps on iOS and Android. Our brands reach more than 20 million members worldwide so members can connect, meet and express themselves on a platform that prioritizes privacy and security. We invest heavily into SwiftUI and using Swift Packages to modularize the codebase.

Release Notes

Additional platforms
2 weeks ago

Swiftpack is being maintained by Petr Pavlik | @ptrpavlik | @swiftpackco | API