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

If you want to extract the public key out from a DSA 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_dsa.key -pubout -out my_dsa_pub.key
OpenSSL> exit

C:\Users\fyicenter>type my_dsa_pub.key
-----BEGIN PUBLIC KEY-----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-----END PUBLIC KEY-----

Options used in this command are:

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

⇒OpenSSL "genpkey" Command for DSA Keys

⇒⇒OpenSSL Tutorials