patched version of GNU dd with forensic features

 dc3dd is a patched version of GNU dd with added features for computer
 forensics:
 .
  * on the fly hashing (md5, sha-1, sha-256, and sha-512);
  * possibility to write errors to a file;
  * group errors in the error log;
  * pattern wiping;
  * progress report;
  * possibility to split output.