How to use the certificate generated in windows in linux?

Question

linux

Good afternoon. I'm trying to establish a connection to a single SOAP service using PHP on Ubuntu 14.10. What was done:
A fragment of the documentation:

Creating and configuring certificates
To create a certificate yourself, do the following:
1. Run the following command to create a certificate:
makecert.exe -n "CN=name" -ss My -r -m 120 -pe -sky exchange -a sha1
2. С Using the Certificates snap-in, export the generated certificate to a .cer file and send it to the address provided by the technical support service.
3. Using the Certificates snap-in, import the certificate file into Trusted people.

I now have this pair of *.cer certificates. My difficulty is figuring out how to use these certificates. I tried to create a standard SoapClient by specifying in the settings the certificate sent to me converted to pem-format, the connection silently falls off by timeout.
I tried to send a request using curl without a soap client, then an error was already returned about the signature and security. As far as I remember (I’ve been fighting for a long time), I took the certificate generated on our side in Windows, extracted the public and private keys from it in pem format, specified them in the curl settings using CURLOPT_SSH_PUBLIC_KEYFILE and CURLOPT_SSH_PRIVATE_KEYFILE, specified the certificate sent by the technical support of the service in pem format using CURLOPT_SSLCERT, but still the same error.
Previously, I had to work only with certificates from crypto, but there, in addition to the certificates, six more key files were sent and I had to change the library in order to use the cryptopro curl, but as I understand it, this is not the case here.
In general, as I understand it, to connect you need to use the public and private key of the machine for which the certificate was generated, after all, it confirms only a couple of this machine?
I also tried to run the script by gaining access to the Windows machine in which the certificate was generated, having previously added it to the trusted ones using the snap-in, but I got the same errors about signature and security. "An error occurred when verifying security for the message."
Please direct me to the right path.

Answer 1

And what is the second .cer file turned out to be, isn't it ca.cer, by any chance? CER converts easily to CRT: stackoverflow.com/a/5478901
Let's say that using wget with key authentication requires the following:
* CA certificate to validate the server's certificate (usually ca.crt);
* client.crt - client certificate (public key);
* client.pem (.key) - client private key

Answer 2

Download openssl for windows and convert to the required format
Or use the online converter
https://www.sslshopper.com/ssl-converter.html