smime encryption

bayanaa · 05-25-2012, 01:27 PM

First, I create a private/public key

openssl genrsa -out c.key 2048

Then, I extracted the public key because I want to encrypt a file using smime and this public key

openssl rsa -in c.key -pubout -out publickey.pem

But, this command doesn't produce file.enc

openssl smime -encrypt -in file.txt -out file.enc publickey.pem

plz, can anyone tell me what's the matter?

Noway2 · 05-25-2012, 03:27 PM

There are two links that I suggest you look at:
1 - The OpenSSL How To Document here: http://www.madboa.com/geek/openssl/
It has many examples of using OpenSSL to encryt and decrypt a document.
2 - the smime man page here: http://www.openssl.org/docs/apps/smime.html

You will notice that the smime uses a PKCS12 format (PEM) for the key. Your RSA key is not in this format.

bayanaa · 05-25-2012, 03:57 PM

Quote:

Originally Posted by Noway2

You will notice that the smime uses a PKCS12 format (PEM) for the key. Your RSA key is not in this format.

Thank you

But, I extracted the public key in pem format from RSA key, and I use this public one in smime command .