Every cmd listed above is a (sub-)command of the openssl (1) application. It has its own detailed manual page at openssl-cmd (1). For example, to view the manual page. Openssl dgst -verify foo.pem expects that foo.pem contains the 'raw' public key in PEM format. The raw format is an encoding of a SubjectPublicKeyInfo structure, which can be found within a certificate; but openssl dgst cannot process a complete certificate in one go. You must first extract the public key from the certificate.
OpenSSL is an open-source implementation of the SSL protocol. The OpenSSL commands are supported on almost all platforms including Windows, Mac OSx, and Linux operating systems. The OpenSSL can be used for generating CSR for the certificate installation process in servers. So, today we are going to list some of the most popular and widely used OpenSSL commands. These examples will probably include those ones which you are looking for. So, have a look at these best OpenSSL Commands Examples.
Common OpenSSL Commands
There are some random Open SSL commands which allow completing various tasks such as generating CSR and private keys. Let's have a look at them.
Generate new private key and CSR (Certificate Signing Request)
Generate self-signed certificate
This will generate a self-signed SSL certificate valid for 1 year. The 2048-bit RSA alongside the sha256 will provide the maximum possible security to the certificate.
Generate a CSR for an existing private key in the server
Generate a CSR for an existing certificate
Generate an RSA key
Generate a DSA key
Remove a passphrase from private key
Connect to a web server using SNI
Base64-encode
Encrypt a file
Decrypt a file
Check Using OpenSSL
Instead of performing the operations such as generating and removing keys and certificates, you could easily check the information using the OpenSSL commands. Here are a few examples.
Check a CSR (Certificate Signing Request)
Check a private key
Check a certificate
Check a PKCS#12 file with extension .pfx or .p12
Test SSL certificate of particular URL
Check the Certificate Signer Authority
Check PEM File Certificate Expiration Date
Check OpenSSL version
Check Certificate Expiration Date of SSL URL
Check if particular cipher is accepted on URL
Debugg Using OpenSSL
Often times, you may face errors such as the private key doesn't match the certificate. In such situations, the following commands will be helpful.
Check MD5 hash of the public key to check it matches with a CSR or private key
Check an SSL connection
Benchmark using OpenSSL
The OpenSSL commands are also available for benchmarking needs. You could benchmark your server performance and connection stability using the commands.
Benchmark my system's performance
Benchmark remote connections
Convert Operations using OpenSSL
Openssl Dgst Hmac
To convert the SSL certificates or keys from one format to another, you could utilize the following commands. You can change the format from one to another to make the certificates compatible with the server.
Convert a PEM file to DER
Convert a PKCS#12 file (.pfx .p12) containing a private key and certificates to PEM
You can add -nocerts to only output the private key or add -nokeys to only output the certificates. Merge multiple excel sheets into one sheet online free printable.
Convert a PEM certificate file and a private key to PKCS#12 (.pfx .p12)
Convert a DER file (.crt .cer .der) to PEM
The list of all available OpenSSL commands
If you don't know, the command line itself can tell you the complete available OpenSSL commands. To do this, the best option is inputting an invalid command to the command line. For example, you could use this command.
Openssl Dgst -sha1 -sign
It will display the list of available commands like this
Mediban paint pro. There you can find out all the possible commands recognized by your command line. In addition, you could also find out a list of the sub-commands by using an incorrect subcommand like this.
Openssl Dgst Tutorial
Now you know a bunch of useful commands for the OpenSSL. Go and try them yourself.
