To amplify on shmem's response, you can have md5 or sha digests, and they will reveal themselves by the $1 or $2 .

#!/usr/bin/perl
use Crypt::PasswdMD5;

#The secret to getting crypt to work correctly is in providing 
#a salt starting with '$1$' and having 8 characters 
#(instead of the normal 2 used for DES-crypt). 
#There are similar conventions for using other crypt variants 
#(e.g. '$2$' for SHA-crypt).

my $passwd = 'whoopdeedoo';
my $salt = '$1$qwertyuz';
print "md5crypt salt= $salt \n";
print "-------------------------------------\n";
my $crypted = unix_md5_crypt $passwd, $salt;
print "$crypted\n";

my $crypted = crypt $passwd, $salt; #crypt works as well
print "$crypted\n";
print crypt ($passwd, $salt), "\n";

######################################################################
print "#################################################\n";
print "des crypt salt= xy \n";
my $passwd = 'whoopdedoo';
my $salt = 'xy';
print "-------------------------------------\n";
my $crypted = crypt $passwd, $salt;
print "$crypted\n";
print crypt ($passwd, $salt), "\n";


#Note that the MD5-based crypt() is not the same as 
#obtaining the hash of your password with Digest::MD5 or similar. 
#The algorithm used internally by the MD5-based crypt() uses a 
#number of transformations in which the MD5 algorithm is used, 
#but is very different.

#Crypt::PasswdMD5 implements this algorithm in Perl, 
#allowing you to reproduce the result of said crypt() functions 
#in non-*nix systems or systems without a compatible crypt() 
#implementation.
[download]

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