Understanding the Basics of SSL Certificates
Before diving into how to convert PEM to Cert using OpenSSL, it’s essential to understand the basics of SSL certificates. SSL certificates are small data files that are used to encrypt and secure communication between a server and a client. They contain information about the identity of the website owner, the website’s public key, and the digital signature of the certificate authority that issued the certificate.
SSL certificates can be of multiple types, including PEM, DER, PKCS#7, PFX, and others. PEM is one of the most common types of SSL certificates.
What is OpenSSL?
OpenSSL is a software library that provides developers with a toolkit for implementing SSL and TLS protocols. It’s an open-source implementation of SSL and TLS protocols that enables secure communication between servers and clients.
OpenSSL comes with a set of command-line tools that allow users to perform various cryptographic operations, including the conversion of SSL certificates from one format to another.
One key takeaway from this text is that OpenSSL is a software library that provides developers with a toolkit for implementing SSL and TLS protocols, and it includes a set of command-line tools that allow users to perform various cryptographic operations, including the conversion of SSL certificates from one format to another. By understanding the basics of SSL certificates, such as the different types of certificates available and the significance of their contents, users can use OpenSSL commands to convert PEM files to Cert files and customize the conversion process using command-line options.
What is PEM Format?
PEM is a widely used format for SSL certificates. It stands for Privacy-Enhanced Mail, which was its original use case. PEM files are Base64-encoded ASCII files that contain the certificate and private key in a single file. PEM files have a .pem or .crt extension.
One key takeaway is that OpenSSL is a useful tool for converting SSL certificates from one format to another, and it provides various command-line options to customize the conversion process. It’s essential to understand the basics of SSL certificates, including the PEM format, before using OpenSSL to convert them.
Converting PEM to Cert Using OpenSSL
To convert a PEM file to a Cert file using OpenSSL, you need to follow these steps:
Open a terminal window and navigate to the directory where the PEM file is located.
Run the following OpenSSL command to convert the PEM file to a Cert file:
openssl x509 -in file.pem -out file.crt -outform der
In this command, replace
file.pem with the name of your PEM file and
file.crt with the name of the Cert file you want to create.
Press Enter, and OpenSSL will convert the PEM file to a Cert file in DER format.
You can verify the conversion by opening the Cert file in a text editor and checking if it contains the certificate information.
One key takeaway is that OpenSSL is a useful software library with command-line tools that allow users to convert SSL certificates from one format to another. Understanding the basics of SSL certificates and the different formats is important for successfully using this tool.
Understanding OpenSSL Command Line Options
OpenSSL provides several command-line options that enable users to customize the conversion process. Here are some of the most commonly used options:
-in: Specifies the input file name.
-out: Specifies the output file name.
-outform: Specifies the output file format. It can be DER, PEM, PKCS#7, PFX, and others.
-inform: Specifies the input file format. It can be DER, PEM, PKCS#7, PFX, and others.
-noout: Prevents OpenSSL from printing the certificate information to the console.
-text: Prints the certificate information in human-readable format.
FAQs for openssl command to convert pem to cert
What is the openssl command to convert pem to cert?
The openssl command to convert pem to cert is:
openssl x509 -outform der -in certificate.pem -out certificate.cer
This command takes a PEM format certificate file as input (certificate.pem) and creates a DER format certificate file as output (certificate.cer). This DER format certificate file can be used in applications that require this specific format.
What is a PEM format certificate file?
PEM stands for Privacy Enhanced Mail, which is a format for secure electronic mail originally developed in the 1980s. PEM format certificate files are a common type of digital certificate, commonly used to secure online transactions and protect sensitive data. The PEM format is a base64 encoded ASCII text format that uses one or more ‘—–BEGIN’ and ‘—–END’ markers to indicate the start and end of the certificate information.
What is a DER format certificate file?
DER stands for Distinguished Encoding Rules, and is a binary format used to encode digital certificates. DER format certificate files are more compact than PEM format certificate files, making them more efficient to use and store in applications that require high levels of security.
Why do I need to convert a PEM format certificate file to a DER format certificate file?
There are many reasons why you might need to convert a PEM format certificate file to a DER format certificate file. For example, some software applications require DER format certificates to operate correctly, while others may require PEM format certificates. Converting between certificate formats is a common practice in the world of digital security, and openssl is a widely used tool for this purpose.
Are there any risks involved in using openssl to convert certificates?
As with any tool used in digital security, there is a risk involved in using openssl to convert certificates. However, openssl is a well-established and reliable tool that has been used for many years in this process. It is important to use caution when working with digital certificates, and to protect sensitive information accordingly. This includes taking appropriate measures to secure your system and using trusted sources when obtaining certificates and using openssl.