Using 64 bit OpenSSL Kit on Windows.

[A Z <poweruserm@xxxxxxxxxxx>]

Dear SSL,

Your encryption kit is supreme.  I have been using it to build self-signed web certificates

and email certificates.  I have also been using it to encrypt and decrypt messages,

all via RSA.  I am running OpenSSL using 64 bit Windows 10, which is different

to Linux, a little bit.

-I can do error checks on rsa private keys.

openssl rsa -check -in private.key -noout

1. How can I do something parallel to this, to do an error check on a public key, so
   that it also replies with a command line message saying whether a public
   key is alright, or not?

2. If I have an rsa private/public key pair, in two different files, what openssl
   command can I run to verify if these two keys match one another, accurately?

3. If I have a private key and a .crt web certificate, what openssl command
   can I run to verify if these two files continue to match?

4. If I have a Thunderbird Email certificate, in pkcs12 format, can I run openssl
   to verify that with the .crt certificate that came before it? 
   
5. 
   
6. And how can I verify between the pkcs12 email certificate and the original private key?

Yours Sincerely,

poweruserm.