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.
files intergrity checker for Windows
Checksum calculation and verification tool.
Calculate and verify file checksum md5, sha1, etc
The program is the whole complement.