I settled on:

use Crypt::SaltedHash;

# Individual registers as a new user, supplying a username
# and a password/passphrase in a form on a web page. 
# But, for illustration:

my $desired_password = 'Owning 2 boats is 1 boat too many!';

my $csh = Crypt::SaltedHash->new(algorithm => 'SHA-256');
$csh->add($desired_password);  
my $digest = $csh->generate;   # Some might prefer to call 'digest'
   # something like 'hash_string' instead

# Then the value of $digest is stored to a file or database
# along with the corresponding username (not shown).
#
# By the way, for the $desired_password shown, the digest that 
# was generated is this string:
#
#    {SSHA256}rn8PJZd//2EsEgHTBQ0izsN2T7AJMsLRH19oLIA5unaf8OaJ
#
# ...but it would be very different for you, because Crypt::SaltedHash
# randomizes the "salt" used in the creation of the digest. And it
# would be very different for me, if this script were to be run a
# second time, even though it would be processing the same 'Owning 2 
# boats is 1 boat too many!' desired password.
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In another program, when the individual enters a username and a password/passphrase into a login form:

use Crypt::SaltedHash;
 
my $asserted_password = ___; # Some process to retrieve the value 
   # entered on a web form by the user, not illustrated here

my $digest = ___; # Some retrieval process that looks up the earlier-s
+tored
   # digest corresponding to the username, not illustrated here

my $is_valid = Crypt::SaltedHash->validate( $digest, $asserted_passwor
+d );

grant_account_access() if ( $is_valid );
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