SHA1_Final() places the message digest in B<md>, which must have space
for SHA_DIGEST_LENGTH == 20 bytes of output, and erases the B<SHA_CTX>.
-When the entire message is available at one time, L<SHA1(3)|SHA(3)>
+When the entire message is available at one time, L<SHA1(3)|SHA1(3)>
can be used.
=head1 RETURN VALUES