openssl

To generate random bytes with openssl, use the openssl rand utility which is the openssl random number generator. This utility utilizes a CSPRNG, a cryptographically secure pseudo-random number generator. As of v1.1.1, openssl will use a trusted entropy source provided by the operating system to … [Read more...] about openssl rand – Generate random numbers and passwords

The openssl crl command and utility will process CRL (Certificate Revocation List) files in both DER and PEM format. CRL locations can be found on the X.509 certificate itself, under the "CRL Endpoints" section. Here is a screenshot from the Mozilla Firefox certificate viewer of the SSL … [Read more...] about openssl crl

Use the openssl verify function to verify a certificate chain. openssl verify certificate chain To verify a certificate and its chain for a given website, run the following command: openssl verify -CAfile chain.pem www.example.org.pem Where -CAfile chain.pem is the downloaded … [Read more...] about openssl verify – Verify a certificate and certificate chain

The openssl passwd command can be used to compute password hashes. openssl passwd examples To compute the password hash without a salt, run the following command: openssl passwd -crypt password To compute a salted password hash, run the following command using the crypt algorithm (which … [Read more...] about openssl passwd

The openssl ca command and utility is a lightweight piece of software that can be used to perform minimal CA (Certification Authority) functions. The command can sign and issue new certificates including self-signed Root CA certificates, generate CRLs (Certificate Revocation Lists), and other CA … [Read more...] about openssl ca

The openssl list command and utility is used to show supported algorithms and features as well as algorithms and features that have been disabled. openssl list may be used across various operating systems and versions to display supported features as well as disabled features. To display a list … [Read more...] about openssl list

The openssl ec command and utility can be used to process your EC (Elliptic Curve) keys. This article will walk you through examples on processing EC keys with the openssl ec utility as well as the openssl ecparam utility. An EC private key header and footer is formatted as follows: This … [Read more...] about openssl ec

What is DSA? DSA is short for Digital Signature Algorithm, an asymmetric digital signature algorithm used primarily for digital signatures and this article will use the openssl dsa utility to demonstrate its use. DSA like RSA can be used for both digital signatures and encryption, but is primarily … [Read more...] about openssl dsa