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

@interface NSString (MD5)
+ (NSString *)md5To32bit:(NSString *)str;
@end

#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:@"x", digest[i]];
  return result;
}

#import "ViewController.h"
#import "NSString+MD5.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
  [super viewDidLoad];
 
  NSString *name = @"Kuture";
  
  //加密字符串
  NSString *encypt = [NSString md5To32bit:name];
  NSLog(@"\n name: %@\n encypt: %@",name,encypt);
  
}

@end