Converting Objective-C code to plain C

Question

I'm using the following code to verify the application is signed. It's in Objective-C and it's based on the code found on Professional Cocoa Application Security.

OSStatus secError = noErr; // retrieve this process's code object SecCodeRef myCode; secError = SecCodeCopySelf(kSecCSDefaultFlags, &myCode); if (noErr != secError) { NSLog(@"unable to retrieve code object, security error %d", secError); return -1; } // validate the process's identity, using the internal requirements secError = SecCodeCheckValidity(myCode, kSecCSDefaultFlags, NULL); switch (secError) { case noErr: NSLog(@"this process has a valid signature"); break; case errSecCSUnsigned: NSLog(@"this process executable is unsigned"); break; case errSecCSSignatureFailed: case errSecCSGuestInvalid: NSLog(@"this process has an invalid signature"); break; default: NSLog(@"error %d validating signature", secError); break; } // get the static code object, representing the executable on disk SecStaticCodeRef fileCode; secError = SecCodeCopyStaticCode(myCode, kSecCSDefaultFlags, &fileCode); if (noErr != secError) { NSLog(@"unable to get static code object, security error %d", secError); CFRelease(myCode); return -1; } //some basic information about the code signature NSDictionary *signingInfo = nil; secError = SecCodeCopySigningInformation(fileCode, kSecCSDefaultFlags, &signingInfo); if (noErr != secError) { if(secError == errSecCSSignatureFailed) NSLog(@"invalid signature"); else NSLog(@"cannot get signing information, security error %d", secError); } else { NSLog(@"signing info: %@", signingInfo); [signingInfo release]; } CFRelease(myCode); CFRelease(fileCode);

I need to convert this to plain C so I can also use it on the apps I am writing in C. One of the problem is the NSDictionary *signingInfo = nil; which I tried to solve by using CFDictionaryRef *signingInfo = NULL; but it doesn't seem to work.

Any chance anyone could translate this code to C?

Thanks!

And here we go, mind explaining WHY the downvotes? If you have something to say PLEASE say to my face and not just downvote — Mr Aleph
– Mr Aleph, Commented Jan 20, 2012 at 14:44

Martin Hering · Accepted Answer · 2012-01-20 14:44:07Z

Have you tried using CFDictionaryRef signingInfo = NULL; without the extra *? A core foundation ref already is a pointer. CFDictionaryRef is toll-free bridged to NSDictionary*. [signingInfo release]; can then be translated to CFRelease(signingInfo). You should also replace NSLog with something else.

Great, thanks! And thanks for pointing out the CFRelease(signingInfo)

David Heffernan · Accepted Answer · 2012-01-20 14:43:27Z

3

CFDictionaryRef already is a pointer. So you should use CFDictionaryRef rather than CFDictionaryRef*.

answered Jan 20, 2012 at 14:43

David Heffernan

616k46 gold badges1.1k silver badges1.5k bronze badges

Collectives™ on Stack Overflow

Converting Objective-C code to plain C

2 Answers 2

1 Comment

Comments

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Related