Understanding the Basics of Certificate Conversion
Certificates are essential components that validate the authenticity of a website or an application. The certificate conversion allows software applications to read the certificates in a variety of formats. In this article, we’ll delve into converting .cer files to .pem files using OpenSSL.
What is OpenSSL?
OpenSSL is an open-source toolkit implementing the Transport Layer Security (TLS) and Secure Sockets Layer (SSL) protocols. It is a high-level cryptographic library that provides an open-source implementation of the SSL and TLS protocols.
What are .cer and .pem files?
A .cer file is a binary certificate file that contains a public key and a digital signature. It is the certificate format used by Microsoft Windows to store X.509 certificates. On the other hand, .pem files are Base64 encoded ASCII files that contain a private key and a public certificate. They are the most common format used by Linux-based systems.
Converting .cer to .pem using OpenSSL
To convert a .cer file to a .pem file, we need to use OpenSSL. Follow the steps below:
Step 1: Install OpenSSL
To use OpenSSL on Linux, it must be installed on your system. You can install OpenSSL using the following command:
Step 2: Convert .cer to .pem
Once OpenSSL is installed, you can convert the .cer file to .pem using the following command:
Here, the “x509” command is used to work with X.509 certificates, “-inform der” specifies the input format as DER, “-in” specifies the input file name, and “-out” specifies the output file name.
Step 3: Verify the Conversion
To verify that the conversion was successful, you can view the contents of the .pem file using the following command:
If the contents of the .pem file are displayed, the conversion was successful.
OpenSSL is an open-source toolkit implementing the Transport Layer Security (TLS) and Secure Sockets Layer (SSL) protocols. It is a high-level cryptographic library that provides an open-source implementation of the SSL and TLS protocols. OpenSSL is used by many software applications to provide secure communication channels.
OpenSSL supports a wide range of cryptographic operations, including encryption, decryption, digital signatures, and certificate management. It also provides a command-line interface that allows you to perform various cryptographic operations.
A key takeaway from this article is that OpenSSL is an open-source toolkit that can be used to convert certificate files from one format to another. Converting .cer files to .pem files is useful when working with Linux-based systems. It is important to understand the basics of certificate conversion and the differences between .cer and .pem files to effectively use OpenSSL.