[转]iOS中MD5加密

origin linkage: http://stackoverflow.com/questions/1524604/md5-algorithm-in-objective-c

                     http://www.cnblogs.com/bobli/archive/2012/06/26/2563295.html

#import <CommonCrypto/CommonDigest.h> // Need to import for CC_MD5 access


- (NSString *)md5:(NSString *)str
{
    const char *cStr = [str UTF8String];
    unsigned char result[16];
    CC_MD5(cStr, strlen(cStr), result); // This is the md5 call
    return [NSString stringWithFormat:
        @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
        result[0], result[1], result[2], result[3], 
        result[4], result[5], result[6], result[7],
        result[8], result[9], result[10], result[11],
        result[12], result[13], result[14], result[15]
        ]; 
}