libsignal/swift/Sources/LibSignalClient/zkgroup/ClientZkAuthOperations.swift

//
// Copyright 2020-2022 Signal Messenger, LLC.
// SPDX-License-Identifier: AGPL-3.0-only
//

import Foundation
import SignalFfi

public class ClientZkAuthOperations {
    let serverPublicParams: ServerPublicParams

    public init(serverPublicParams: ServerPublicParams) {
        self.serverPublicParams = serverPublicParams
    }

    /// Produces the `AuthCredentialWithPni` from a server-generated `AuthCredentialWithPniResponse`.
    ///
    /// - parameter redemptionTime: This is provided by the server as an integer, and should be passed through directly.
    public func receiveAuthCredentialWithPniAsServiceId(aci: Aci, pni: Pni, redemptionTime: UInt64, authCredentialResponse: AuthCredentialWithPniResponse) throws -> AuthCredentialWithPni {
        return try self.serverPublicParams.withNativeHandle { serverPublicParams in
            try aci.withPointerToFixedWidthBinary { aci in
                try pni.withPointerToFixedWidthBinary { pni in
                    try authCredentialResponse.withUnsafeBorrowedBuffer { authCredentialResponse in
                        try invokeFnReturningVariableLengthSerialized {
                            signal_server_public_params_receive_auth_credential_with_pni_as_service_id($0, serverPublicParams, aci, pni, redemptionTime, authCredentialResponse)
                        }
                    }
                }
            }
        }
    }

    public func createAuthCredentialPresentation(groupSecretParams: GroupSecretParams, authCredential: AuthCredentialWithPni) throws -> AuthCredentialPresentation {
        return try self.createAuthCredentialPresentation(randomness: Randomness.generate(), groupSecretParams: groupSecretParams, authCredential: authCredential)
    }

    public func createAuthCredentialPresentation(randomness: Randomness, groupSecretParams: GroupSecretParams, authCredential: AuthCredentialWithPni) throws -> AuthCredentialPresentation {
        return try self.serverPublicParams.withNativeHandle { contents in
            try randomness.withUnsafePointerToBytes { randomness in
                try groupSecretParams.withUnsafePointerToSerialized { groupSecretParams in
                    try authCredential.withUnsafeBorrowedBuffer { authCredential in
                        try invokeFnReturningVariableLengthSerialized {
                            signal_server_public_params_create_auth_credential_with_pni_presentation_deterministic($0, contents, randomness, groupSecretParams, authCredential)
                        }
                    }
                }
            }
        }
    }
}