IOS uses MD5-string encryption to MD5 & get file MD5

IOS string encryption to MD5

 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 % 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 }

The iPhone processes large files and detects MD5 Code

 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 % 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 }