iOS 字符串加密至MD5

//创建MD5字符串

+(NSString *)createdMD5:(NSString *)signString

{

    constchar*cStr =[signString UTF8String];

    unsignedchar result[16];

    CC_MD5(cStr, strlen(cStr), result);

    return[NSStringstringWithFormat:

           @"%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]

           ]; 

}