OpenSSL Generate 4096-bit Certificate (Public/Private Key Encryption) with SHA256 Fingerprint
E: openssl x509 -pubkey -noout -in cert.pem pubkey.pem If for some reason, you have to use the openssl command prompt, just enter everything up to the '. Then OpenSSL will print out the public key info to the screen. You can then copy this and paste it into a file called pubkey.pem. The private key however is stored on the machine that generated the CSR (presumably the server requiring the cert, but not necessarily) and is NOT included in the contents of the CSR, and may not be derived from the CSR. It is kept private. In general terms, the server generating the CSR generates a key pair (public and private). You upload the digital certificate to the custom connected app that is also required for JWT-based authorization. You can use your own private key and certificate issued by a certification authority. Alternatively, you can use OpenSSL to create a key and a self-signed digital certificate. Jun 19, 2015 The commands below demonstrate examples of how to create a.pfx/.p12 file in the command line using OpenSSL: PEM (.pem,.crt,.cer) to PFX openssl pkcs12 -export -out certificate.pfx -inkey privateKey.key -in certificate.crt -certfile more.crt.
gencert.sh
# Generate Private Key and Certificate using RSA 256 encryption (4096-bit key) |
openssl req -x509 -newkey rsa:4096 -keyout privatekey.pem -out certificate.pem -days 365 |
# Alternatively, setting the '-newkey' parameter to 'rsa:2048' will generate a 2048-bit key. |
# Generate PKCS#12 (P12) file for cert; combines both key and certificate together |
openssl pkcs12 -export -inkey privatekey.pem -in certificate.pem -out cert.pfx |
# Generate SHA256 Fingerprint for Certificate and export to a file |
openssl x509 -noout -fingerprint -sha256 -inform pem -in certificate.pem >> fingerprint.txt |
# Generate SHA1 Fingerprint for Certificate and export to a file |
#openssl x509 -noout -fingerprint -sha1 -inform pem -in certificate.pem >> fingerprint.txt |
# FYI, it's best practice to use SHA256 instead of SHA1 for better security, but this shows how to do it if you REALLY need to. |
commented Nov 7, 2019
Here's a couple useful links related to this: |
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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
Download pubg license key generator no survey. ), Chrome stopped the page loading.Public Key Definition
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
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