1 #import <CommonCrypto/CommonDigest.h>
 2 
 3 + (NSString *) md5:(NSString *)str 
 4 {
 5     const char *cStr = [str UTF8String];
 6     unsigned char result[16];
 7     CC_MD5( cStr, strlen(cStr), result );
 8     return [NSString stringWithFormat:@"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",
 9                            result[0], result[1], result[2], result[3], 
10                            result[4], result[5], result[6], result[7],
11                            result[8], result[9], result[10], result[11],
12                            result[12], result[13], result[14], result[15]
13   ];
14 }

 1 +(NSString*)fileMD5:(NSString*)path
 2 {
 3     NSFileHandle *handle = [NSFileHandle fileHandleForReadingAtPath:path];
 4     if( handle== nil ) return @"ERROR GETTING FILE MD5"; // file didnt exist
 5  
 6     CC_MD5_CTX md5;
 7  
 8     CC_MD5_Init(&md5);
 9  
10     BOOL done = NO;
11     while(!done)
12     {
13         NSData* fileData = [handle readDataOfLength: CHUNK_SIZE ];
14         CC_MD5_Update(&md5, [fileData bytes], [fileData length]);
15         if( [fileData length] == 0 ) done = YES;
16     }
17     unsigned char digest[CC_MD5_DIGEST_LENGTH];
18     CC_MD5_Final(digest, &md5);
19     NSString* s = [NSString stringWithFormat: @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
20                    digest[0], digest[1], 
21                    digest[2], digest[3],
22                    digest[4], digest[5],
23                    digest[6], digest[7],
24                    digest[8], digest[9],
25                    digest[10], digest[11],
26                    digest[12], digest[13],
27                    digest[14], digest[15]];
28     return s;
29 }