#import "NSString+MD5HexDigest.h"

@implementation NSString (md5)

-(NSString *) md5HexDigest
{
   const char *original_str = [self UTF8String];
   unsigned char result[CC_MD5_DIGEST_LENGTH];
   CC_MD5(original_str, strlen(original_str), result);
   NSMutableString *hash = [NSMutableString string];
   for (int i = 0; i < 16; i++)
        [hash appendFormat:@"%02X", result[i]];
   return [hash lowercaseString];
}

@end