On May 13, 2014, at 22:20, Devarshi Kulshreshtha <devarshi.bluec...@gmail.com> 
wrote:

> In CyrptoExercise sample provided by apple, we have a wrapper class: 
> SecKeyWrapper.

First, I think CryptoExercise is out of date. It’s not included in Xcode 5.1’s 
doc set. I found it on Apple’s website, but it looks like it was last updated 
for iOS 3, and it has a bunch of obsolete workarounds for running in the 
simulator (a long time ago the Keychain APIs were different in the device and 
simulator environments.)

> Shall I use below code to create and send an encoded string to server:

> 1. SecKeyWrapper *keyWrapper = [SecKeyWrapper sharedWrapper];
> 2. NSData *publicKeyData = [keyWrapper getPublicKeyBits];

It’s sample code, not a black box, so you can look at what it does yourself. 
The two lines you gave aren’t going to do anything by themselves — 
getPublicKeyBits just reads an already-existing public key out of the Keychain 
and encodes it. You have to generate the key first.

—Jens

PS: This discussion really belongs on the apple_cdsa list, which is for 
crypto/security discussions. Unfortunately Apple’s engineers never help out on 
that list (unlike on xcode-users or macnetworkprog), but there are some other 
fairly knowledgeable people there.
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