foreach (@srt2)
{
- my $x = $xref_tbl{$_}[2];
+ my ($p1, $p2, $x) = @{$xref_tbl{$_}};
+ # If digest or signature algorithm is "undef" then the algorithm
+ # needs special handling and is excluded from the cross reference table.
+ next if $p1 eq "undef" || $p2 eq "undef";
print "\t\&sigoid_srt\[$x\],\n";
}