Use MD5 to encrypt strings in IOS _ios

1, new nsstring category, remember to add the header file required for encryption #import <CommonCrypto/CommonDigest.h>, Nsstring+md5.h:

#import <Foundation/Foundation.h>
#import <CommonCrypto/CommonDigest.h>

@interface nsstring ( MD5)
+ (NSString *) Md5to32bit: (NSString *) str;
@end

2, write the encryption method:

#import "Nsstring+md5.h"

@implementation nsstring (MD5)

+ (NSString *) Md5to32bit: (NSString *) str {
  
  const char *cstr = [str utf8string];
  unsigned char digest[cc_md5_digest_length];
  CC_MD5 (CStr, strlen (CStr), digest);
  nsmutablestring *result = [nsmutablestring stringwithcapacity:cc_md5_digest_length * 2];
  for (int i = 0; i < cc_md5_digest_length i++)
    [result appendformat:@ "%02x", Digest[i]];
  return result;
}

3, import the header file into the current controller of the string character that needs to be encrypted, and reference the method:

#import "ViewController.h"
#import "nsstring+md5.h"

@interface viewcontroller ()

@end

@ Implementation Viewcontroller

-(void) viewdidload {
  [super viewdidload];
 
  NSString *name = @ "Kuture";
  
  Encrypted string
  nsstring *encypt = [NSString md5to32bit:name];
  NSLog (@ \ Name:%@\n encypt:%@ ", name,encypt);
  
}

@end

The results of the operation are:

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