Tutorial: iPhone App With Compiled OpenSSL Library

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This is a tutorial for using self-compiled builds of  the OpenSSL-library on the iPhone. You can build apps with XCode and the official SDK from Apple with this. I also made a small example-app for using the libraries with XCode and the iPhone/iPhone-Simulator. You can also download the precompiled OpenSSL-library (1.0.0a).

This tutorial works with OpenSSL 0.9.8o and Xcode 3.2 with iPhoneOS 3.1.3. An updated version of this tutorial for OpenSSL 1.0 and Xcode 3.2.3 with iOS 4 is here: http://www.x2on.de/2010/07/13/tutorial-iphone-app-with-compiled-openssl-1-0-0a-library/

UPDATE 2010-07-13: New tutorial for OpenSSL 1.0.0a and iOS4 UPDATE 2010-06-30: I have updated OpenSSL to 1.0.0a with iOS 4.0 as base SDK UPDATE 2010-06-10: I have updated OpenSSL to 0.9.8o + iPad Version UPDATE 2010-03-31: I have updated OpenSSL to 0.9.8n UPDATE 2010-02-26: I have updated OpenSSL to 0.9.8m

You can get the Source of the example app with compiled OpenSSL at http://github.com/x2on/OpenSSL-for-iPhone

Create OpenSSL Libary:

  • Download OpenSSL Sourcecode
  • Build OpenSSL for i368 iPhoneSimulator:
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cd openssl-0.9.8o
mkdir openssl_arm
mkdir openssl_i386
./config --openssldir=/Users//openssl-0.9.8o/openssl_i386
  • Edit Makefile:
  • Change CC = cc to:
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CC= /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.0
  • Add as first item to CFLAG:
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-isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.1.2.sdk

* Change in crypto/ui/ui_openssl.c


static volatile sig_atomic_t intr_signal;

to

static volatile int intr_signal;

for preventing building error

* Build it:


make
make install





* Your libcrypto.a and libssl.a are in the folder openssl_i368/lib


* Rename the two files to libcrypto_i386.a and libssl_i386.a

  • Build OpenSSL for arm iPhoneOS:

    mv openssl_i386 openssl_i386_lib make clean

    • Edit Makefile:

      • Search and replace openssl_i386 with openssl_arm

      • Change -arch i386 in CFLAG to: -arch armv6

        • Change

      CC= /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.0

to

CC=  /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.0





  * Change


-isysroot  /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.1.2.sdk

to

-isysroot  /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.1.2.sdk








* Build it:


make
make install





* Your libcrypto.a and libssl.a are in the folder openssl_arm/lib


* Rename the two files to libcrypto_arm.a and libssl_arm.a

Edit your iPhone-XCode project:

  • Copy the “include” folder from OpenSSL into your project-folder

  • Copy the libcrypto*.a and libss*.a files into your project-folder

  • Drag the libcrypto*.a and libss*.a files into your XCode Framework Folder-Tree

  • Open the Build-Info from your “Target” (Righclick on Target - Get Info)

  • Change Library Search Paths to

    $(inherited) “$(SRCROOT)”

  • Change User Header Search Paths to include

  • Activate Always Search User Paths

Enjoy OpenSSL on the iPhone!

I have made an iPhone OS 3.1.2 XCode Project with OpenSSL 0.9.8o libaries. The examples uses the MD5-algorithm to calculate an md5 hash from an UITextfield.

Download: http://github.com/x2on/OpenSSL-for-iPhone

Disclaimer: Use this at your own risk.

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