This ActiveX OCX can compute very fast the checksum of strings or files using Adler32 , CRC32 , MD5 , SHA-1 and SHA-256 , the code is optimized for new AMD and Intel processors running very fast in the win32 environment. RSP Checksum OCX is licensed as shareware, the cost of the registered version is $50 and full size of the download is 0.37 MB. You may download a free version of RSP Checksum OCX by following download link at Free Download section of this page. RSP Checksum OCX is developed or distributed by RSP Software and is listed under activex ocx visual basic.