- Openssl Create Self Signed Certificate Keystore
- Generate Certificate Request Openssl
- Openssl Apache Self Signed Certificate
One main source of problems working with encryption is the creation of your private key and your certificate. You must create the key pair correctly, have it imported at the right place and if you just miss one important option, you can go on an endless hunt for the problem – one exception at the time.
Attention: use self-signed certificates only for testing proposes. For production, make a certificate request and get a properly signed certificate from a CA.
Jun 01, 2018 -newkey rsa:4096: Create a 4096 bit RSA key for use with the certificate. RSA 2048 is the default on more recent versions of OpenSSL but to be sure of the key size, you should specify it during creation.-x509: Create a self-signed certificate.-sha256: Generate the certificate request using 265-bit SHA (Secure Hash Algorithm). Use openssl to create self-signed certificates and CSRs Self-signed certificates offer the same level of encryption as commercial certificates, but you can generate them yourself and for longer durations of validity. University IT often uses self-signed certificates on development and test servers. Oct 19, 2011 This short video shows how to create a self-signed certificate using the openssl command tools. How to create a self-signed certificate using openssl. Keyout localhost.key -out localhost. The first OpenSSL command generates a 2048-bit (recommended) RSA private key. The second command generates a Certificate Signing Request, which you could instead use to generate a CA-signed certificate. This step will ask you questions; be as accurate as you like since you probably aren’t getting this signed by a CA.
Openssl Create Self Signed Certificate Keystore
The certificate snap-in in
mmc
can create public/private key pairs. 2010 microsoft office key generator. However, creating it this way means an endless list of dialog windows where you most likely miss an important setting. I tried it a few times, but whenever I needed a new certificate, I had a slightly different dialogue to work with. In my opinion, OpenSSL is a much better approach for reliable creation of certificates. The many options you have are well described in the the OpenSSL Cookbook.Download and installation
The official site for OpenSSL lists various binary versions for Windows. The first project listed there is slproweb.com where you find the
Win64 OpenSSL v1.1.1a
package in the download section. The page looks old and outdated, but the binaries are frequently updated. When the download is complete, execute the *.exe file and go through the wizard with Next.
Create your own certificate…
Generate Certificate Request Openssl
To create a self-signed certificate using an RSA 4096 key and the SHA256 hashing algorithm, you can run the following two commands. Be aware, you need the password you set later to import your certificate.
opensslreq -x509 -newkeyrsa:4096 -sha256 -keyoutmy.key -outmy.crt -subj'/CN=test.com' -days600 |
2 4 6 8 10 12 14 16 18 20 22 24 26 | { varstore=newX509Store(StoreName.My,StoreLocation.LocalMachine); varcollection=store.Certificates.Find(X509FindType.FindBySubjectName, { Console.WriteLine($'Certificate '{myCert.FriendlyName}' is found'); Console.WriteLine($'Has private key? {myCert.HasPrivateKey}'); Console.WriteLine($'Private key: {myCert.PrivateKey.ToXmlString(true)}'); else Console.WriteLine('Certificate {0} is not found!!',name); Console.ReadKey(); |
If all works, you should get an output like this one:
If you get a CryptographicException with the message “Keyset does not exist” instead, check the permissions of the private key first. It may just need a simple fix as described here.
Conclusion
If you know those two OpenSSL commands, you can create as many certificates as you like. The export to pfx step is a tricky one, but as soon as you know that command as well, it is much simpler than the mmc alternative.