Generate hash from UIImage

by

I wound up using the following code to accomplish the task. Note that this requires that you import <CommonCrypto/CommonDigest.h>:

unsigned char result[CC_MD5_DIGEST_LENGTH];
NSData *imageData = [NSData dataWithData:UIImagePNGRepresentation(inImage)];
CC_MD5([imageData bytes], [imageData length], result);
NSString *imageHash = [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]
                       ];

More Related Contents:

  1. How can I get a precise time, for example in milliseconds in Objective-C?
  2. When do you make an underscore in front of an instance variable? [duplicate]
  3. UIBarButtonItem with color?
  4. How do I draw a line on the iPhone?
  5. How to set Local Notification repeat interval to custom time interval?
  6. How can I ‘cut’ a transparent hole in a UIImage?
  7. UIImagePickerController camera preview is portrait in landscape app
  8. Limit the number of lines for UITextview
  9. Can I use CGAffineTransformMakeRotation to rotate a view more than 360 degrees?
  10. Is it possible to configure a UITableView to allow multiple-selection?
  11. UIScrollView. Any thoughts on implementing “infinite” scroll/zoom?
  12. iPhone – Get Position of UIView within entire UIWindow
  13. How can I pop a view from a UINavigationController and replace it with another in one operation?
  14. Quick Explanation of SUBQUERY in NSPredicate Expression
  15. iOS devices as web server [closed]
  16. Getting the bounds of an MKMapView
  17. Add UIView Above All Other Views, Including StatusBar
  18. How to give space between two cells in tableview?
  19. Can I write native iPhone apps using Python? [closed]
  20. UITextField: move view when keyboard appears
  21. How to create a UITableViewCell with a transparent background
  22. Show iPhone soft keyboard even though a hardware keyboard is connected
  23. UIActionSheet button’s color
  24. COMET (server push to client) on iPhone [closed]
  25. My custom UI elements are not being updated while UIScrollView is scrolled
  26. Create a table of contents from a pdf file
  27. UITableView with infite scrolling and lazy loading
  28. How can I detect whether the iphone has been rebooted since last time app started
  29. Non-retaining array for delegates
  30. How to add NSDebug.h and use NSZombie in iPhone SDK

Leave a Comment