Change some URLs from author dirs to dist dirs.
The example in the porter's handbook didn't have the trailing slash;
mea culpa for not having caught that when it went in.
constructs a stream cipher from a block cipher or cryptographic hash funtion
and returns it as an object. Any block cipher in the Crypt:: class can be
used, as long as it supports the blocksize and keysize methods. Any hash
function in the Digest:: class can be used, as long as it supports
the add method.
WWW: http://search.cpan.org/dist/Crypt-Ctr
PR: ports/90613
Submitted by: Gabor Kovesdan
