{"id":2000,"date":"2023-04-24T08:36:19","date_gmt":"2023-04-24T08:36:19","guid":{"rendered":"https:\/\/cheapsslweb.com\/resources\/?p=2000"},"modified":"2025-12-19T10:01:29","modified_gmt":"2025-12-19T10:01:29","slug":"openssl-commands-quick-guide","status":"publish","type":"post","link":"https:\/\/cheapsslweb.com\/resources\/openssl-commands-quick-guide","title":{"rendered":"Basic OpenSSL Commands to Generate Key Pair and Verify Certificate  Details"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Are you new to OpenSSL and unaware of the basic OpenSSL commands? Don&#8217;t worry; we&#8217;ve got you covered. This article will explore basic OpenSSL commands commonly used to manage internet servers and perform various other activities, such as troubleshooting.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But, before we start with the commands, it will be best to get some idea about what OpenSSL is and where to use the OpenSSL command line.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is OpenSSL?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>OpenSSL is a free and popular cryptography library that provides various tools for SSL-related tasks, such as:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Managing certificates<\/li>\n\n\n\n<li>Comparing an MD5 hash of the certificate<\/li>\n\n\n\n<li>Performing encryption and decryption<\/li>\n\n\n\n<li>Converting a certificate into a different format<\/li>\n\n\n\n<li>Verify whether the certificate is installed correctly, etc.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Even though this tool can perform various tasks, it is mainly used to create CSR and private keys. <a href=\"https:\/\/www.openssl.org\/\">OpenSSL is an open-source<\/a> implementation of the SSL protocol that can be used on both Linux and Windows servers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This means the same commands can be used on both platforms, whether Windows or Linux. You can download the latest version of OpenSSL from their <a href=\"https:\/\/www.openssl.org\/source\/\">official website<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Now, coming back to the main topic &#8211; OpenSSL commands.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">OpenSSL Commands Line<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For a better understanding, let&#8217;s divide the commands into four categories, <strong>such as:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>You use commands to create CSR, private keys, and other activities.<\/li>\n\n\n\n<li>The commands that you use to verify the information<\/li>\n\n\n\n<li>Commands that you use for troubleshooting<\/li>\n\n\n\n<li>Commands that you can use for changing certificates and keys into other formats<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Note:<\/strong> We will be referring to the Private Key as Secret Key.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Commands to Create CSR, Secret Keys, and Other Activities<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For creating a CSR and a secret key<\/strong>, use the following command given below:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl req -out CSR.csr -new -newkey rsa:2048 -nodes -keyout privateKey.key<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For creating a self-signed certificate<\/strong>, use the following command given below:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl req -x509 -sha256 -nodes -days 365 -newkey rsa:2048 -keyout privateKey.key -out certificate.crt<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For creating a CSR for a current secret key<\/strong>, use the following command given below:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl req -out CSR.csr -key privateKey.key -new<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For creating a CSR based on a current certificate<\/strong>, use the following command given below:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl x509 -x509toreq -in certificate.crt -out CSR.csr -signkey privateKey.key<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For vacating a passphrase from a secret key<\/strong>, use the following command given below:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl rsa -in privateKey.pem -out newPrivateKey.pem<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">OpenSSL x509 Commands to Verify the Information<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For checking the information within a CSR<\/strong>, use the following command given below:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl req -text -noout -verify -in CSR.csr<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For checking the information within a secret key<\/strong>, use the following command given below:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl rsa -in privateKey.key -check<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For checking the information within a certificate<\/strong>, use the following command given below:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl x509 -in certificate.crt -text -noout<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For checking the information within a PKCS#12 file<\/strong>, use the following command given below:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl pkcs12 -info -in keyStore.p12<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">OpenSSL Command to Check Certificate Details for Troubleshooting<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>If you face an issue where:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Private key and certificate are not the same, or<\/li>\n\n\n\n<li>The installed certificate is not trusted<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Verify that the MD5 hash of the private key is similar to the CSR<\/strong> or secret key, and to do this, use any one of the commands:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl x509 -noout -modulus -in certificate.crt | openssl md5<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl rsa -noout -modulus -in privateKey.key | openssl md5<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code> openssl req -noout -modulus -in CSR.csr | openssl md5<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For debugging an SSL connection<\/strong>, use the following command given below:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl s_client -connect www.paypal.com:443<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Commands for Changing Certificates and Keys into Other Formats<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For changing either one of these &#8211; .der, .crt, and .cer<\/strong> files to <a href=\"https:\/\/cheapsslweb.com\/resources\/convert-ssl-to-pem-der-crt-pfx\">PEM format<\/a>, use the following command given below:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl x509 -inform der -in certificate.cer -out certificate.pem<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For changing PEM to DER file<\/strong>, use the following command given below:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl x509 -outform der -in certificate.pem -out certificate.der<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">For changing the format of a file with .p12 or .pfx extension and incorporating certificate files and private key to the file with PEM extension, use the following command given below:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl pkcs12 -in keyStore.pfx -out keyStore.pem -nodes<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For changing the certificate file having .PEM extension and private key to the .p12 or .pfx format<\/strong>, use the following command given below:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl pkcs12 -export -out certificate.pfx -inkey privateKey.key -in certificate.crt -certfile CACert.crt<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The article delivers a thorough guide to primary OpenSSL commands classified into four types: creating CSR and secret keys, verifying information, troubleshooting, and changing certificates and keys into other formats. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">By understanding and using these commands, users can manage their internet servers and troubleshoot any issues.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Are you new to OpenSSL and unaware of the basic OpenSSL commands? Don&#8217;t worry; we&#8217;ve got you covered. This article will explore basic OpenSSL commands commonly used to manage internet servers and perform various other activities, such as troubleshooting. But, before we start with the commands, it will be best to get some idea about<span class=\"morelink d-block mt-3\"><a href=\"https:\/\/cheapsslweb.com\/resources\/openssl-commands-quick-guide\">Read More<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":4941,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25],"tags":[28,468],"class_list":["post-2000","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ssl-errors-guide","tag-openssl","tag-openssl-commands","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>List of OpenSSL Commands for SSL Certificates<\/title>\n<meta name=\"description\" content=\"An end-to-end list of basic OpenSSL commands to perform the activities such as CSR generation, private key generation, SSL validation, etc.\" \/>\n<meta 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