Generating random IP, String, Hash key, Array Element in perl

Getting a random key from hash:

my $hash = {
           key1 => 'val1',
           key2 => 'val2',
           key3 => 'val3'
        };

print "\n Random key from hash : " . randomKey($hash);

sub randomKey
{
    my $hashRef = shift;
    my @keyArray = keys %$hashRef;
    my $randVal = $keyArray[rand @keyArray];
    return $randVal;
}



Getting a random element from array:

my @array = qw(element1 element2 element3);
print "\n Random element from array : " .randomElement(\@array);

sub randomElement
{
    my $keyArray = shift;
    my $arrLen = scalar @$keyArray -1;
    my $randNum = int(rand($arrLen));
    return $keyArray->[$randNum];
}


Generating a random IP address:

print "\n Random IP address: " . getRandomIP();

sub getRandomIP
{
    return join ".", map int rand 256, 1 .. 4;
}



Generating a random Session ID:

print "\n Random Session ID : " . getRandomSessionID();

sub getRandomSessionID
{
    return sprintf("%0.8x",rand()*0xffffffff);
}


Generating a random string

print "\n Random string of 15 chars : " . getRandomString(15);

sub getRandomString
{
    my $len = shift;
    my @chars=('a'..'z','A'..'Z','0'..'9');
    my $random_string;
    foreach (1..$len) {
    $random_string.=$chars[rand @chars];
    }
    return $random_string;
}