OpenSSL is a robust, commercial-grade, and full-featured toolkit for the Transport Layer Security (TLS) and Secure Sockets Layer (SSL) protocols. It’s useful but hard to remember so many commands, so I have listed some common usages below.
For more information, see man openssl in your terminal.-newkey rsa:4096: Create a 4096 bit RSA key for use with the certificate. RSA 2048 is the default on more recent versions of OpenSSL but to be sure of the key size, you should specify it during creation.-x509: Create a self-signed certificate. That generates a 2048-bit RSA key pair, encrypts them with a password you provide and writes them to a file. You need to next extract the public key file. You will use this, for instance, on your web server to encrypt content so that it can only be read with the private key.
Generate a new RSA private key
Generate a new ECC private key
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Generate a new private key and Certificate Signing Request
Generate a self-signed certificate
Generate a certificate signing request (CSR) for an existing private key
Generate a multi-domain SSL 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
Crypto key generate rsa modulus 1024 error. With the ability to recover prime factors, an attacker can compute the secret exponent d from a public key ( n, e), then decrypt c using the standard procedure. To accomplish this, an attacker factors n into p and q, and computes lcm( p − 1, q − 1) which allows the determination of d from e. Currently the most promising approach to solving the RSA problem is to factor the modulus n.
Check a Certificate Signing Request (CSR)
Check a private key
Check a certificate
Check a PKCS#12 file (.pfx or .p12)
Check the chained certificates
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
Check an SSL connection using specified CA
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
Convert a PEM certificate file and a private key to PKCS#12 (.pfx .p12)