MD5加密

iOS 字符串加密至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",
 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 }

  

iPhone处理大文件检测MD5的代码

 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 }