Jakob,
You make a good point. In fact, after some reflection, there is
probably no reason for the device to store more than the 96 bytes of
keyvalue in secure store. If some format is needed to use the key, that
can be done at that time. This is for the case where the device
supports only one algorithm.
I know that the current practice is crypto agility, but IoT,
particularly automotive IoT, will select and live with one for a
generation of product. When the next best thing is selected, then that
will be used, but not retrofitted. I hope that soon, I will be able to
push Ed25519; I am concerned about the computational cost, though (still
not clear why SHA512 and not SHAKE128). Meanwhile P256 is what is fielded.
Bob
On 08/23/2017 03:52 PM, Jakob Bohm wrote:
On 22/08/2017 22:26, Robert Moskowitz wrote:
Want to continue this thread but with new information. I built a
Fedora-arm 26 system (on a Cubieboard2) and it has openssl version
1.1.0f
I built my DER root cert (and private key) no problem.
I built my DER Intermediate cert private key and CSR no problem.
For the following command:
sn=8
format=der
dir=/root/ca3
cadir=/root/ca3
openssl x509 -req -days 3650 -extfile $cadir/openssl-root.cnf
-extensions v3_intermediate_ca\
-sha256 -set_serial 0x$(openssl rand -hex $sn)\
-inform $format -in $dir/csr/intermediate.csr.$format\
-outform $format -out $dir/certs/intermediate.cert.$format\
-CAkeyform $format -CAkey $cadir/private/ca.key.$format\
-CAform $format -CA $cadir/certs/ca.cert.$format
I built this reading:
https://www.openssl.org/docs/man1.1.0/apps/x509.html
This generates:
3069592528:error:0906D06C:PEM routines:PEM_read_bio:no start
line:crypto/pem/pem_lib.c:691:Expecting: CERTIFICATE REQUEST
The man page above has CAkeyform and CAform in the summary, but no
details below. I am ASSUMEing DER is now supported.
for -sha256, I finally figured out that -[digest] is how the the man
presents which hash to use.
Why does this command use -extfile and not -config? Is it because
ALL that is taken from config is -extensions? Confusing to the
casual user.
But why the error?
And yes, I know I can convert a PEM cert to DER, but I would also
have to convert the private key, and maintain duo structures in
places. Would RATHER have a parallel setup. Of course there is the
challenge of the cert chain that Viktor earlier explained. OCSP? :)
I don't think you have to pass all the various formats as PEM just
because you pass one of them as such. After all, there are separate
-XXXform style options for most of them.
For example, you could store the CA private key in the encryption-
supporting PEM format on the plentyful memory of the SD card, while
using the more compact DER format for certificates and CSRs stored
on embedded controllers (ECUs, dashboard displays etc.).
Where OpenSSL bugs prevent use of DER for a file, it can be converted
on the fly, storing the converted file in RAM (using tmpfs or similar).
Enjoy
Jakob
--
openssl-users mailing list
To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users
