I *think* that SHA1 is used by OpenSSL.
You can find the checksum for a file by typing
openssl sha1 <file>
Where <file> is the name of the file you want to verify.
You should get the SHA1 checksum from the web page where you downloaded the file from (or better yet, a different web site altogether).
You can then copy the SHA1 checksum from the web page, and enter the following command:
openssl sha1 <file> | grep <SHA1 Checksum from the website>
If you see output, then the file is o.k. If not, then you probably want to make sure you copied/pasted the checksum into the terminal correctly, and typed the filename correctly, etc.
openssl dgst -sha256 <filename>