Extract public/private key from PKCS12 file for la

Question

I want to extract the public and private key from my PKCS#12 file for later use in SSH-Public-Key-Authentication.

Right now, I'm generating keys via ssh-keygen which I put into .ssh/authorized_key, respective somewhere on the client-side.

In future, I want to use the keys from a PKCS#12 container, so I've to extract the public-key first from PKCS#12 and then put them into the .ssh/authorized_keys-file. Is there any chance to get this working via openssl? Are the keys in PKCS#12 compatible for ssh-public-key authentication?

Answer 1

You can use following commands to extract public/private key from a PKCS#12 container:

• PKCS#1 Private key

  openssl pkcs12 -in yourP12File.pfx -nocerts -out privateKey.pem
  

• Certificates:

  openssl pkcs12 -in yourP12File.pfx -clcerts -nokeys -out publicCert.pem
  

Answer 2

As far as I know PKCS#12 is just a certificate/public/private key store. If you extracted a public key from PKCS#12 file, OpenSSH should be able to use it as long as it was extracted in PEM format. You probably already know that you also need a corresponding private key (also in PEM) in order to use it for ssh-public-key authentication.

Answer 3

Solution 1:

Extract P12 from jks

keytool -importkeystore -srckeystore MyRootCA.jks -destkeystore MyRootCA.p12 -deststoretype PKCS12

Extract PEM from P12 and Edit file and pem from crt file

openssl pkcs12 -in MyRootCA.p12 -clcerts -nokeys -out MyRootCA.crt

Extract key from jks

openssl pkcs12 -in MyRootCA.p12 -nocerts -out encryptedPrivateKey.pem
openssl rsa -in encryptedPrivateKey.pem -out decryptedPrivateKey.key

Solution 2:

Extract PEM and encryptedPrivateKey to txt file```

openssl pkcs12 -in MyRootCA.p12 -out keys_out.txt

Decrypt privateKey

openssl rsa -in encryptedPrivateKey.key [-outform PEM] -out decryptedPrivateKey.key

Answer 4

This is possible with a bit of format conversion.

To extract the private key in a format openssh can use:

openssl pkcs12 -in pkcs12.pfx -nocerts -nodes | openssl rsa > id_rsa

To convert the private key to a public key:

openssl rsa -in id_rsa -pubout | ssh-keygen -f /dev/stdin -i -m PKCS8

To extract the public key in a format openssh can use:

openssl pkcs12 -in pkcs12.pfx -clcerts -nokeys | openssl x509 -pubkey -noout | ssh-keygen -f /dev/stdin -i -m PKCS8

Answer 5

Update: I noticed that my answer was just a poor duplicate of a well explained question on https://unix.stackexchange.com/... by BryKKan

Here is an extract from it:

openssl pkcs12 -in <filename.pfx> -nocerts -nodes | sed -ne '/-BEGIN PRIVATE KEY-/,/-END PRIVATE KEY-/p' > <clientcert.key>

openssl pkcs12 -in <filename.pfx> -clcerts -nokeys | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > <clientcert.cer>

openssl pkcs12 -in <filename.pfx> -cacerts -nokeys -chain | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > <cacerts.cer>

Answer 6

OpenSSH cannot use PKCS#12 files out of the box. As others suggested, you must extract the private key in PEM format which gets you from the land of OpenSSL to OpenSSH. Other solutions mentioned here don’t work for me. I use OS X 10.9 Mavericks (10.9.3 at the moment) with “prepackaged” utilities (OpenSSL 0.9.8y, OpenSSH 6.2p2).

First, extract a private key in PEM format which will be used directly by OpenSSH:

openssl pkcs12 -in filename.p12 -clcerts -nodes -nocerts | openssl rsa > ~/.ssh/id_rsa

I strongly suggest to encrypt the private key with password:

openssl pkcs12 -in filename.p12 -clcerts -nodes -nocerts | openssl rsa -passout 'pass:Passw0rd!' > ~/.ssh/id_rsa

Obviously, writing a plain-text password on command-line is not safe either, so you should delete the last command from history or just make sure it doesn’t get there. Different shells have different ways. You can prefix your command with space to prevent it from being saved to history in Bash and many other shells. Here is also how to delete the command from history in Bash:

history -d $(history | tail -n 2 | awk 'NR == 1 { print $1 }')

Alternatively, you can use different way to pass a private key password to OpenSSL - consult OpenSSL documentation for pass phrase arguments.

Then, create an OpenSSH public key which can be added to authorized_keys file:

ssh-keygen -y -f ~/.ssh/id_rsa > ~/.ssh/id_rsa.pub