Generate Rsa Public Key From Certificate
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  1. Rsa Public Key Encryption
  2. Generate Rsa Public Key From Certificate Pdf
  3. Generate Rsa Public Key
OpenSSL Generate 4096-bit Certificate (Public/Private Key Encryption) with SHA256 Fingerprint
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.

I have the requirement to extract the public key (RSA) from a.cer file. Generated text for key events 2017. I wish to extract the key and store it in a.pem file so I can use its value to encrypt values using jsencrypt. Public key is embedded in the SSL certificate and private key is stored on the server and kept secret. When a site visitor fills out a form with personal information and submits it to the server, the information gets encrypted with the public key to protect if from eavesdropping.

commented Nov 7, 2019

Here's a couple useful links related to this:

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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)

Generate a Certificate Signing Request (CSR)

Rsa

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

Convert private key to PEM format

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

View details of a RSA private key

Rsa Public Key Encryption

View details of a CSR

View details of a Certificate

View details of a Certificate in DER format

Generate Rsa Public Key From Certificate Pdf

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

Generate Rsa Public Key

Convert a PEM file to DER