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+From: http://www.x2on.de/2010/02/01/tutorial-iphone-app-with-compiled-openssl-library/
+
+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 (0.9.8m-beta1).
+
+Create OpenSSL Libary:
+
+    * Download OpenSSL Sourcecode
+    * Build OpenSSL for i368 iPhoneSimulator:
+          o cd openssl-0.9.8m
+            mkdir openssl_arm
+            mkdir openssl_i386
+            ./config --openssldir=/Users/
+
+          o Edit Makefile:
+                + Change CC = cc to:
+
+                  CC= /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.0
+
+                + Add as first item to CFLAG:
+
+                  -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.1.2.sdk
+
+          o Change in crypto/ui/ui_openssl.c
+
+            static volatile sig_atomic_t intr_signal;
+
+            to
+
+            static volatile int intr_signal;
+
+            for preventing building error
+          o Build it:
+
+            make
+            make install
+
+          o Your libcrypto.a and libssl.a are in the folder openssl_i368/lib
+          o Rename the two files to libcrypto_i386.a and libssl_i386.a
+    * Build OpenSSL for arm iPhoneOS:
+          o 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
+
+          o Build it:
+            make
+            make install
+
+          o Your libcrypto.a and libssl.a are in the folder openssl_arm/lib
+          o 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 0.9.8m (Beta1) Libaries. The examples uses the MD5-algorithm to calculate an md5 hash from an UITextfield.