Openssl Generate Public Key From Cert
Openssl Generate Public Key From Cert 3,5/5 1776 reviews
  1. Openssl Generate Private Key From Certificate
  2. Secret Key
  3. Symmetric Key
  4. Openssl Generate Key And Cert
  5. What Is Public Key
Verify downloaded file

$ openssl genrsa -out /path/to/wwwservercom.key 2048 This will invoke OpenSSL, instruct it to generate an RSA private key using the DES3 cipher, and send it as an output to a file in the same directory where you ran the command. Hit Enter  to generate your private key. Linux servers use OpenSSL libraries when encrypting and working with keys. In those libraries you can create the CSR request for your certificate that is used by an Apache or nginx server. After successfully logging on to the server, you will create the CSR request (the public key). The certificate authority must be provided with this request.

RSA Public Key pad and encrypt
Read ciphertext as Hex chars
Decrypt with RSA Private Key, from binary ciphertext
Decrypt with DES
Convert from ciphertext from hex to ciphertext
Base64 operations

Key Pairs

Convert private key file to PEM file
Print EC private key & extract public key
Read EC public key
Print RSA private key & extract public key
Print the entire certificate

Certificates

Downloaded the leaf certificate from Stackoverflow.com.

Print the entire certificate
Create own cert from Private key

Use own private key to generate a self-signed certificate with it. This command creates a self-signed certificate (domain.crt) from an existing private key (domain.key):

Extract Public Key from Cert as PEM file
Print public key only
Strip the Generic Header and Footer
Extract Public Key from Cert in Hex format

Nginx Self-Signed Cert

Nginx needed the Leaf's Private Key the Leaf's Certificate or a certificate chain.

Whichever choice, I always found PEM files worked better with OpenSSL.

If you hit Expecting: TRUSTED CERTIFICATE error, check you actually chained the Certificates and NOT the Public Keys.

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Apply the new Leaf Private Key and Certificate Chain:

This all worked fine with Firefox and Safari on macOS. But Chrome gave: Error: 'Subject Alternative Name Missing'. Despite having a trusted Cert Chain (Root CA, Int CA), Chrome stopped the page loading.

To re-generate the files required by Nginx, I used the same Root CA, Int CA and focused on a new leaf that had a Subject Alternative Name. I used Keychain. See the picture below.

Reference

Common OpenSSL Commands with Keys and Certificates

Generate RSA private key with certificate in a single command

Generate Certificate Signing Request (CSR) from private key with passphrase

Generate RSA private key (2048 bit)

Openssl Generate Private Key From Certificate

Generate a Certificate Signing Request (CSR)

Generate RSA private key (2048 bit) and a Certificate Signing Request (CSR) with a single command

Convert private key to PEM format

Openssl Generate Public Key From Cert

Secret Key

Generate a self-signed certificate that is valid for a year with sha256 hash

View details of a RSA private key

View details of a CSR

View details of a Certificate

Symmetric Key

View details of a Certificate in DER format

Openssl Generate Key And Cert

Convert a DER file (.crt .cer .der) to PEM

What Is Public Key

Convert a PEM file to DER