How to extract the public key from an RSA key file using OpenSSL "pkey" command?

If you want to extract the public key out from an RSA 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_rsa.key -pubout -out my_rsa_pub.key
OpenSSL> exit

C:\Users\fyicenter>type my_rsa_pub.key
-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDAExMAY742YWBAnv+3NTAI+cUR
lQQsszJtWO+tz2wryoe0XbD3x0tm5tByOjcZ7Hbp7QlaURf2Xmk3aN02UCOQGPG8
G4uIcK+2vCcIdiTCwL2DujkxYg5u5gAtgQCTrNBqJiGnGDEoNJaxAvR/PkqFM8D2
vvoat6ixisha/631UQIDAQAB
-----END PUBLIC KEY-----

Options used in this command are:

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

⇒ OpenSSL "pkey -pubin" - View RSA Public Key

⇐ OpenSSL "pkey -text" - Print RSA Key in Text

⇑ OpenSSL "genpkey" Command for RSA Keys

⇑⇑ OpenSSL Tutorials