Objective-c MD5 file checksum

Can match with PHP "md5_file" function.

#import <CommonCrypto/CommonDigest.h>
@implementation NSData (MyExtensions)
- (NSString*)md5
{
    unsigned char result[16];
    CC_MD5( self.bytes, self.length, 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]
            ];  
}
@end

Reference: StackOverFlow

For large files:

+(NSString*)fileMD5:(NSString*)path
{
 NSFileHandle *handle = [NSFileHandle fileHandleForReadingAtPath:path];
 if( handle== nil ) return @"ERROR GETTING FILE MD5"; // file didnt exist
 
 CC_MD5_CTX md5;

 CC_MD5_Init(&md5);
 
 BOOL done = NO;
 while(!done)
 {
  NSData* fileData = [handle readDataOfLength: CHUNK_SIZE ];
  CC_MD5_Update(&md5, [fileData bytes], [fileData length]);
  if( [fileData length] == 0 ) done = YES;
 }
 unsigned char digest[CC_MD5_DIGEST_LENGTH];
 CC_MD5_Final(digest, &md5);
 NSString* s = [NSString stringWithFormat: @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
       digest[0], digest[1], 
       digest[2], digest[3],
       digest[4], digest[5],
       digest[6], digest[7],
       digest[8], digest[9],
       digest[10], digest[11],
       digest[12], digest[13],
       digest[14], digest[15]];
 return s;
}

Reference: iPhone Dev SDK