常用 openssl 命令

The Most Common OpenSSL Commands

One of the most versatile SSL tools is OpenSSL which is an open source implementation of the SSL protocol. There are versions of OpenSSL for nearly every platform, including Windows, Linux, and Mac OS X. OpenSSL is commonly used to create the CSR and private key for many different platforms, including Apache. However, it also has hundreds of different functions that allow you to view the details of a CSR or certificate, compare an MD5 hash of the certificate and private key (to make sure they match), verify that a certificate is installed properly on any website, and convert the certificate to a different format. A compiled version of OpenSSL for Windows can be found here.

If you don’t want to bother with OpenSSL, you can do many of the same things with our SSL Certificate Tools. Below, we have listed the most common OpenSSL commands and their usage:

General OpenSSL Commands

These commands allow you to generate CSRs, Certificates, Private Keys and do other miscellaneous tasks.

  • Generate a new private key and Certificate Signing Request
  • Generate a self-signed certificate (see How to Create and Install an Apache Self Signed Certificate for more info)
  • Generate a 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

If you need to check the information within a Certificate, CSR or Private Key, use these commands. You can also check CSRs and check certificates using our online tools.

  • Check a Certificate Signing Request (CSR)
  • Check a private key
  • Check a certificate
  • Check a PKCS#12 file (.pfx or .p12)

Debugging Using OpenSSL

If you are receiving an error that the private doesn’t match the certificate or that a certificate that you installed to a site is not trusted, try one of these commands. If you are trying to verify that an SSL certificate is installed correctly, be sure to check out the SSL Checker.

  • 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

Converting Using OpenSSL

These commands allow you to convert certificates and keys to different formats to make them compatible with specific types of servers or software. For example, you can convert a normal PEM file that would work with Apache to a PFX (PKCS#12) file and use it with Tomcat or IIS. Use our SSL Converter to convert certificates without messing with 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

    You can add -nocerts to only output the private key or add -nokeys to only output the certificates.
  • Convert a PEM certificate file and a private key to PKCS#12 (.pfx .p12)

Originally posted on Sun Jan 13, 2008

https://www.sslshopper.com/article-most-common-openssl-commands.html

CC BY-NC-SA 4.0 常用 openssl 命令 by 桔子小窝 is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

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