封裝一個(gè)類

.h里

#import@interface NSString (md5string)

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

@end

.m里

#import "NSString+md5string.h"#import@implementation NSString (md5string)

+ (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;

}

@end

運(yùn)用

NSString *string = @"aaaa";

NSString *md5Str = [NSString md5String:string];