Program That Scans For Unencrypted Files

I need to scan two network shares and generate a report that contains the file names of any unencrypted files. The shares contain files encrypted with the PGP, GPG, and WinZipAES256 algorithms, so the program needs to be able to recognize these formats as encrypted. Also, it needs to scan the file content rather than simply checking the file extension. Any help would be appreciated. Thanks!