How to encrypt strings in IOS/implement MD5 encryption in IOS/NSString classification in IOS, iosnsstring

How to encrypt strings in IOS/implement MD5 encryption in IOS/NSString classification in IOS, iosnsstring

After reading it, you will learn:

1. Learn the classification implementation in IOS development,

2. Writing of class methods,

3. MD5 encryption/decryption of strings.

----------------------------- Wolfhous ------------------

[1] creating a project and creating a category

[2] classification naming and class selection

[3] writing NSString classification class methods, implementation class methods, and how MD5 Encryption

[4] Test encryption results

[5] decryption: Baidu MD5 decryption directly. Click the song website and enter the decryption KEY. In my Demo,

 

Wolfhous normal encryption 44bf025d27eea66336e5c1133c3827f7

Wolfhous niuqiang encrypted 44fb461963aae22772a18557787c63b3

 

------------------------- Wolfhous -----------------------

It can be seen that normal websites cannot be decrypted. We recommend that you use this encryption when entering a password during registration during development. of course, there are more than N encrypted methods. I will list only one simple method. The source code is shown below.

# Import "NSString + md5String. h"

// Introduce necessary header files

# Import <CommonCrypto/CommonDigest. h>

@ Implementation NSString (md5String)

/** Md5 encryption */

+ (NSString *) md5String :( NSString *) str

{

Const char * myPasswd = [str UTF8String];

Unsigned char mdc [16];

CC_MD5 (myPasswd, (CC_LONG) strlen (myPasswd), mdc );

NSMutableString * md5String = [NSMutableString string];

For (int I = 0; I <16; I ++ ){

[Md5String appendFormat: @ "% 02x", mdc [I];

}

Return md5String;

}

/** Md5 NB (meaning) encryption */

+ (NSString *) md5StringNB :( NSString *) str

{

Const char * myPasswd = [str UTF8String];

Unsigned char mdc [16];

CC_MD5 (myPasswd, (CC_LONG) strlen (myPasswd), mdc );

NSMutableString * md5String = [NSMutableString string];

[Md5String appendFormat: @ "% 02x", mdc [0];

For (int I = 1; I <16; I ++ ){

[Md5String appendFormat: @ "% 02x", mdc [I] ^ mdc [0];

}

Return md5String;

}

@ End