Encryption with RSA public key on iOS

Question

I write an iOS app to communicate with an existing server. The server generates RSA key pair(public key and private key), and sends public key to the client.

The cli

Answer 1

I will answer my qustion:

1. create SecKeyRef with public key string

I am helped by this post: http://blog.flirble.org/2011/01/05/rsa-public-key-openssl-ios/#its-all-in-the-format

It led to my code: https://github.com/ideawu/Objective-C-RSA/blob/master/RSA.m#L34

2. use the SecKeyRef to encrypt input data

Use Apple's SecKeyEncrypt(https://developer.apple.com/library/ios/documentation/Security/Reference/certifkeytrustservices/index.html)

3. the full code on github

https://github.com/ideawu/Objective-C-RSA