Calculate MD5 on iPhone

There's a function CC_MD5, which is used in the WiTap example.

I posted code using openssl over here to do this:

http://discussions.apple.com/message.jspa?messageID=7025577#7025840

rjf&

No, that's not what it means. It means that the iPhone has a convenient uniqueID, whereas they use a a hash of the MAC when running on a Mac. I just dropped some of that code from WiTap into my program and compiles and works fine on the iPhone.

One of my iPhone apps uses the <CommonCrypto/CommonDigest.h> framework for calculating hashes. There is plenty of documentation in the XCode doc sets on the subject. Do a full text search in All Doc Sets for 'CommonDigest'. You will find the CC_MD5 man pages. (For new applications it is preferred to use SHA-256.)

In the iPhone Simulator it all works fine. I can not test it on the iPhone itself

btw. You can put the hash bytes in a NSData object using the dataWithBytes message.

The CommonCrypto framework is not on the iPhone. Unfortunately, the iPhone Simulator compiles against Mac OS X frameworks so it'll work on the Simulator...but you won't get it to compile for the device.

it seems to compile for the device for me in beta 6.

are you using the latest beta?

i should say that it compiles for me... i have not tried it on the device cause the code i'm using used NSXMLDocument, which does not compile on the iphone, yet.

Compiles or runs?

I dunno what headers you're compiling for if it does compile, though, because +there are no CommonCrypto headers for the iPhone+. You can check for yourself.

/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS2.0.sdk/System/Lib rary/PrivateFrameworks/

Message was edited by: Sbrocket52

i'm wondering if i'm including them from the wrong place, but they are all right here:

/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS2.0.sdk/usr/includ e/CommonCrypto/

i include it and use it like this:

#import <CommonCrypto/CommonDigest.h>
....
 unsigned char digest[16];
 char finaldigest[32];
 int i;
 
 CC_MD5([self bytes],[self length],digest);

Heh, nevermind - my programming fu must be off today.

Why was I looking for a C library in the frameworks folder... sigh

I just tried this and it works fine on the device. The header is here:

/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS2.0.sdk/usr/includ e/CommonCrypto/CommonDigest.h

I guess that is because it's not part of a framework but of the C library? No idea. In any case, it pays to try things out ...

EDIT: looks like you found it while I was compiling ...

<pre class="jive-pre">
// Import library
#import <CommonCrypto/CommonDigest.h>
...
// Function definition
NSString * md5( NSString *str )
{
const char *cStr = [str UTF8String];
unsigned char result[CC MD5_DIGESTLENGTH];
CC_MD5( cStr, strlen(cStr), result );
return [NSString
stringWithFormat: @"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",
result[0], result[1],
result[2], result[3],
result[4], result[5],
result[6], result[7],
result[8], result[9],
result[10], result[11],
result[12], result[13],
result[14], result[15]
];
}
...
// Implementation
NSString *digest = md5(@"test");
NSLog(@"MD5 TEST %@", digest);
</pre>

The answer you should get is: 098F6BCD4621D373CADE4E832627B4F6
You can check your results on this page http://www.adamek.biz/md5-generator.php