Convert pem key to ssh-rsa format

Question

Hi

I have a certificate in der format, from it with this command i generate a public key:

openssl x509 -inform der -in ejbcacert.cer -noout -pubkey > pub1key.pub

result is this:

-----BEGIN PUBLIC KEY----- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC7vbqajDw4o6gJy8UtmIbkcpnk O3Kwc4qsEnSZp/TR+fQi62F79RHWmwKOtFmwteURgLbj7D/WGuNLGOfa/2vse3G2 eHnHl5CB8ruRX9fBl/KgwCVr2JaEuUm66bBQeP5XeBotdR4cvX38uPYivCDdPjJ1 QWPdspTBKcxeFbccDwIDAQAB -----END PUBLIC KEY-----

How can i obtain a public key like this? Either from certificate or from this public key?

ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAAgQC7vbqajDw4o6gJy8UtmIbkcpnkO3Kwc4qsEnSZp/TR+fQi62F79RHWmwKOtFmwteURgLbj7D/WGuNLGOfa/2vse3G2eHnHl5CB8ruRX9fBl/KgwCVr2JaEuUm66bBQeP5XeBotdR4cvX38uPYivCDdPjJ1QWPdspTBKcxeFbccDw==

This was obtained with this command:

ssh-keygen -y -f private_key1.pem > public_key1.pub

Need some help please...

Thanks, Adriana

Answer 1

To answer my own question, after posting on openssl mailing list got this:

C code of a program that converts from an OpenSSL public key to an OpenSSH public key. You can grab the code from the following link and compile it yourself :

http://www.idrix.fr/Root/Samples/pubkey2ssh.c