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A C socket wrapper (with SSL) written in Objective-C
Latest commit adf0d0d May 5, 2011 @unixpickle Updated readme
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SSLClient Removed unused framework May 5, 2011
SocketKit Added proper Xcode projects May 5, 2011
README.md Updated readme May 5, 2011
mycert.pem Added SocketKit and SSLClient May 5, 2011

README.md

SocketKit

SocketKit allows the programmer to use an assortment of TCP-based Objective-C classes to connect to TCP servers, and host a TCP server. The SKSocket and SKSocketServer class are used only as abstractions for other socket classes such as SKTCPSocket and SKTCPSocketServer. To use OpenSSL with sockets, there is a simple SKSocket subclass called SKTCPSSLSocket that wraps a TCPSocket for SSL encrypted data communication.

Using SocketKit

To use SocketKit with your Objective-C (iOS or Mac OS X) application, you simply need to copy the SK group (with source code) into your project. Since SocketKit uses OpenSSL, you have to set a few compiler flags through Xcode. To do this, go into Target Info > Build Settings > Other Linker Flags. Add the following flags to this list (exactly as follows.)

-lssl
-lcrypto

Testing

Step 1: Run SocketKit. Once run, you will need to press the 1 key, and hit enter. If Mac OS X asks if you would like SocketKit to be able to accept incoming network connections, click Allow.

Step 2: Run SSLClient in another Xcode client. If SSLClient and SocketKit both print out a string saying "Message: [anything]" then the two clients managed to communicate.

Using Different OpenSSL Keys and Certificates.

To generate a new OpenSSL key and certificate file, run this command in Terminal:

openssl req -x509 -nodes -days 365 -newkey rsa:1024 -keyout mycert.pem -out mycert.pem

To use the generated certificate, use this code to create a TCP SSL Socket:

NSString * pemFile = @"/path/to/mycert.pem";
SKTCPSSLSocket * sslSocket = [[[SKTCPSSLSocket alloc] initWithServerTCPSocket:aSocket publicKey:pemFile privateKey:pemFile] autorelease];

In the SocketKit Xcode project included with this repository, SSLServerTest has code similar to this in SSLServerTest.m.

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