The \libname{libcrc32.a} library provides an implementation of the
CRC-32 checksum algorithm which conforms to the interface required by
the Kerberos library.

\begin{funcdecl}{crc32_sum_func}{static krb5_error_code}{\funcin}
\funcarg{krb5_pointer}{in}
\funcarg{size_t}{in_length}
\funcarg{krb5_pointer}{seed}
\funcarg{size_t}{seed_length}
\funcout
\funcarg{krb5_checksum *}{outcksum}
\end{funcdecl}

This routine computes a CRC-32 checksum over \funcparam{in_length} bytes
at \funcparam{in}, and places the resulting value into
\funcparam{outcksum{\ptsto}contents}.  \funcparam{seed} is ignored.

\funcparam{outcksum{\ptsto}contents} must be set by the caller to point
to at least 4 bytes of storage.