Apr 12, 2020 Openssl create self signed certificate with passphrase. In this section I will share the examples to openssl create self signed certificate with passphrase but we will use our encrypted file mypass.enc to create private key and other certificate files. Generate private key. Openssl req -out CSR.csr -new -newkey rsa:2048 -nodes -keyout privateKey.key will include your public key. This is mandatory as per the PKI process. The CSR, containing your entity information and the public key is sent to any Certificate Authority you like for a request of certificate (hence the CSR name). Sep 11, 2018 The first thing to do would be to generate a 2048-bit RSA key pair locally. This pair will contain both your private and public key. You can use Java key tool or some other tool, but we will be working with OpenSSL. To generate a public and private key with a certificate signing request (CSR), run the following OpenSSL command.
Verify downloaded file
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):
![Openssl Generate Public Key From Certificate Openssl Generate Public Key From Certificate](/uploads/1/2/5/8/125875496/122496839.gif)
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
.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. Java code to generate unique key example.Openssl Generate Public Key From Certificate Download
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.