Sep 15, 2019  Read RSA Private Key RSA is popular format use to create asymmetric key pairs those named public and private key. We can use rsa verb to read RSA private key with the following command. Openssl rsa -in myprivate.pem -check Read X509 Certificate Another case reading certificate with OpenSSL is reading and printing X509 certificates to the terminal. That generates a 2048-bit RSA key pair, encrypts them with a password you provide and writes them to a file. You need to next extract the public key file. You will use this, for instance, on your web server to encrypt content so that it can only be read with the private key.

1. Openssl Generate Certificate Key Pair
2. Openssl Generate Key Pair Pkcs12 Tool
3. Openssl Generate Csr
4. Openssl Generate Certificate

OpenSSL is a robust, commercial-grade, and full-featured toolkit for the Transport Layer Security (TLS) and Secure Sockets Layer (SSL) protocols. It’s useful but hard to remember so many commands, so I have listed some common usages below.

General OpenSSL Commands

Openssl Generate Certificate Key Pair

• Generate a new RSA private key

• Generate a new ECC private key

• Generate a new private key and Certificate Signing Request

• Generate a self-signed certificate

• Generate a certificate signing request (CSR) for an existing private key

• Generate a multi-domain SSL certificate signing request (CSR) for an existing private key

• Generate a certificate signing request based on an existing certificate

• Remove a passphrase from a private key

Checking Using OpenSSL

• Check a Certificate Signing Request (CSR)

• Check a private key

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• Check a certificate

• Check a PKCS#12 file (.pfx or .p12)

• Check the chained certificates

Debugging Using OpenSSL

• Check an MD5 hash of the public key to ensure that it matches with what is in a CSR or private key

• Check an SSL connection. All the certificates (including Intermediates) should be displayed

• Check an SSL connection using specified CA

Converting Using OpenSSL

• Convert a DER file (.crt .cer .der) to PEM

• Convert a PEM file to DER

• Convert a PKCS#12 file (.pfx .p12) containing a private key and certificates to PEM Generate rsa keys in packet tracer 2017.

• Convert a PEM certificate file and a private key to PKCS#12 (.pfx .p12)

You have a private key file in an openssl format and have received your SSL certificate. You'd like now to create a PKCS12 (or .pfx) to import your certificate in an other software?

Here is the procedure!

• Find the private key file (xxx.key) (previously generated along with the CSR).
• Download the .p7b file on your certificate status page ('See the certificate' button then 'See the format in PKCS7 format' and click the link next to the diskette).
• a) Convert this file into a text one (PEM):

  On Windows, the OpenSSL command must contain the complete path, for example:
  c:openssl-win32binopenssl.exe ..)

• b) Now create the pkcs12 file that will contain your private key and the certification chain:
  

  You will be asked to define an encryption password for the archive (it is mandatory to be able to import the file in IIS). You may also be asked for the private key password if there is one!

You can now use the file file final_result.p12 in any software that accepts pkcs12! For IIS, rename the file in .pfx, it will be easier.

Openssl Generate Key Pair Pkcs12 Tool

Alternatively, if you want to generate a PKCS12 from a certificate file (cer/pem), a certificate chain (generally pem or txt), and your private key, you need to use the following command:

Linked Documentation:

Openssl Generate Csr

Openssl Generate Certificate