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=head1 Static Methods

=over 2

=item derive

This function returns a derived key that is supposed to be cryptographically 
strong.
The binary output key will be generated from a textual password B<$pass> using
a salt block B<$salt> (usually binary data) of length B<$salt_len>; the 
algorithm perform the number of iterations specified by B<$iter> (usually > 
1000, better if > 4000). If the salt is empty (or undef) the salt length must 
be 0. The output is binary data with length (in bytes) specified by the 
B<$key_len> parameter.
The function will not ever attempt to auto-calculate the length of the salt 
because it is not assumed to be a NULL terminated value, so its length is 
always required.
The hashing is performed using the default algorithm SHA1, but an alternate 
algortithm may be specified using the (optional) parameter B<alg>; the allowed
values are the textual names as defined in OpenSSL (a list may be obtained 
with the command: openssl dgst -list); so right now you may use: