Fix OpenSSL DH Key Error in Perl - Quick Solution

If you are encountering an OpenSSL DH key error in your Perl script, don't worry, there is a quick solution. This error usually occurs when the DH parameters are not set correctly, causing the SSL handshake to fail.

Step 1: Check DH Parameters

Firstly, check if the DH parameters are set correctly. You can do this by running the following command:

openssl dhparam -check -text -noout -in dhparams.pem

If the DH parameters are not set correctly, generate new parameters using the following command:

openssl dhparam -out dhparams.pem 2048

Make sure to replace "2048" with the desired key size.

Step 2: Update Perl Script

Next, update your Perl script to use the new DH parameters. You can do this by adding the following lines:

use IO::Socket::SSL;
use File::Slurp;

my $dh = read_file("dhparams.pem");
my $ssl_options = {
    SSL_dh => $dh,
};

my $socket = IO::Socket::SSL->new(
    PeerAddr => 'example.com',
    PeerPort => 443,
    %$ssl_options,
) or die "SSL Socket Error: $!";

Make sure to replace "example.com" and "443" with the appropriate values for your use case.

Conclusion

By following these two simple steps, you should be able to fix the OpenSSL DH key error in your Perl script. Remember to always check your DH parameters and update your script accordingly to ensure secure SSL connections.