NSString(md5)

NSString(md5).m

#import <CommonCrypto/CommonCrypto.h>
@interface NSString (md5)

- (NSString *)md5;

@end

@implementation NSString (md5)

- (NSString *)md5
{
    unsigned char result[CC_MD5_DIGEST_LENGTH];
    CC_MD5(self.UTF8String, (unsigned int)strlen(self.UTF8String), result);
    NSMutableString *resultStr = [NSMutableString string];
    for (int i = 0; i < CC_MD5_DIGEST_LENGTH; i ++) {
        [resultStr appendFormat:@"%02x",result[i]];
    }
    return resultStr;
}

@end