A little knowledge of MD5 encryption

-(NSString *) Md5hash

{

const char *CSTR = [self utf8string];

unsigned char result[16];

CC_MD5 (CSTR, (unsigned int)strlen (CSTR), 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]];

}

Here the blue text on MD5 third party is not set data type, but you click Open strlen (CSTR) will find size_t. Open the size_t again.

Show:

#ifndef _size_t

#define _size_t

typedef __darwin_size_t SIZE_T;

#endif/* _size_t */

You found out that size_t was in

typedef under the __darwin_size_t, and then open.

to the Lord.

typedef __size_type__ __darwin_size_t; /* sizeof () */

It turns out to be the sizeof () type

And what type of sizeof () is, of course,

It's unsigned int type.

A little knowledge of MD5 encryption