OpenSSL "pkey -pubout" - Extract EC Public Key

Q

How to extract the public key from a EC key file using OpenSSL "pkey" command?

✍: FYIcenter.com

A

If you want to extract the public key out from a EC key file (private key an public key), you can use the OpenSSL "pkey -pubout" command as shown below: 

C:\Users\fyicenter>\local\openssl\openssl.exe

OpenSSL> pkey -in my_ec.key -pubout -out my_ec_pub.key
OpenSSL> exit

C:\Users\fyicenter>type my_ec_pub.key
-----BEGIN PUBLIC KEY-----
MIG6MIGXBgcqhkjOPQIBMIGLAgEBMBoGByqGSM49AQECDwDbfCq/YuNeZoB2vq0g
izA3BA7bfCq/YuNeZoB2vq0giAQOZZ74ugQ5Fu7eiRFwKyIDFQAA9QsCjk1pbmdo
dWFRdSkEcng/sQQdBAlIcjmZWl7na1X5wvCYqJzlr4ckwKI+Dg/3dQACDwDbfCq/
YuNedijfrGVhxQIBAQMeAATKt2umhaULWqO58OmQMLMsCykE4cor/fRTiA2d
-----END PUBLIC KEY-----

Options used in this command are:

  • "-in my_ec.key" - Read the EC key file from: C:\Users\fyicenter\my_ec.key
  • "-pubout" - Extract the public key out of the EC key file
  • "-out my_ec_pub.key" - Save the public key in a file with no password protection.

 

⇒OpenSSL "genpkey" Command for EC Keys

⇒⇒OpenSSL Tutorials

2017-07-03, 347👍, 0💬

Firefox General Google Chrome IE (Internet Explorer) Intermediate CA Java VM JDK Keytool Microsoft CertUtil Mozilla CertUtil OpenSSL Other Portecle Public Private Key Publishers Revoked Certificates Root CA Tools Tutorial What Is Windows