Calculating Checksums for Oracle Downloads

It took me
quite a while to figure out which check sum algorithm Oracle is using on some
of its download pages. E.g. on the OSB download page, we find the comment “Oracle
Service Bus Size: 1.06 GB, Check Sum:1490338751”

This check
sum is generated by the old unix tool cksum, which protects for accidental
corruption during transport, however is not cryptographically secure. See http://en.wikipedia.org/wiki/Cksum
for more details.

On Windows
we can use cksum.exe which is included in win32 tools from the project win-bash
(http://win-bash.sourceforge.net/).  Calculating the check sum for the OSB
download on my machine yields:

The first
number is the CRC value which matches the value from the oracle website and the
second value is the size in bytes.