Encrypt a message using a public key in a file using openssl (virtualbox)

Question

I have a question regarding the public key encryption. I have the public key of X and want to encrypt the message in the file message.txt using the public key of X stored in the file X.pub using openssl. I'm currently using virtualbox. I'm not sure how to import the public key of X. Any help is much appreciated.

Thanks.

just copy / paste the key into the virtualbox or copy the message from the virtualbox. Where exactly do you have the problem? — gusto2, May 19 '18 at 12:03
Well I tried that but I cannot copy or paste the key. I tried the code below: openssl rsault -in message.txt -out encmessage.enc -pubin -inkey X.pub -encrypt — user9815591, May 19 '18 at 12:06
What does `file X.pub` get you? `.pub` is not a file format identifier... — Maarten Bodewes, May 19 '18 at 20:54

score 0 · Answer 1 · answered May 25 '18 at 12:40

I guess you have messed with your ssh public key. If I am not wrong, regenerates it as PEM :

 openssl rsa -in <your ssh private key> -pubout -out X.pub.pem

and then encode your message with this public key :

openssl rsautl -in message.txt -out encmessage.txt -pubin -inkey X.pub.pem -encrypt

Encrypt a message using a public key in a file using openssl (virtualbox)

1 Answers1