Forum Discussion
IheartF5_45022
Nacreous
NacreousAES::encrypt - can decrypt function be carried out elsewhere?
If the F5 has used AES ecryption to encrypt a string via AES::encrypt, can the key be exported and used on another downstream device to decrypt? This downstream device could be
a) another F5
b) not an F5
I'm putting those 2 options there in case the answer is different for each.
The last devcentral posts I saw on this indicated that the encryption/decryption was intended to be carried out on the same device but that new information may be released soon. This was a year ago. Are there any updates?
Rgds
Jo
HamishCirrocumulus
Another F5 device, yes certainly (You can prove that with an HA pair and a hard-coded or shared key. When an HA failover occurs, the backup device can now decrypt the content that the primary device encrypted)...
A non-F5 device, SHOULD be possible, but I've never tried it...
I suspect what you're trying to do though is to tunnel traffic across a network from one F5 to another? If so, why not simply use an SSL/TLS tunnel or connection?
H
DeVon_JarvisNimbostratus
As Hamish said, this is possible, as long as you use a hardcoded key. Do not use [AES::key] command, as this generates a random key and the same key must be used to encrypt or decrypt. This is due to AES being a symmetric key encryption algorithm, meaning both sides need to use a shared key.
DeVon
patonbikeCirrus
Does anyone know the syntax to decrypt data on say, a linux machine with openssl command? I am trying to do this as a proof of concept. Obviously we are using a pre shared key.
What cipher is it?
This does NOT work:
openssl aes-256-ecb -d -K MY_AES_256_KEY_HERE base64 -in MY_F5_Base64_encoded_aes256_string_here.txt -debug