The 0x00 byte in the BITSTRING is the number of unused bits in the last
octet of the encoded bit string.
See X.690 as a BER/DER reference. Document is free to download from ITU
website.
--
Erwann ABALEA
Le 24/01/2013 19:17, kap...@mizera.cz a écrit :
I have used header from my certificate - it does contain only ASN.1
structure data - unspecific.
The structure you can see with
openssl asn1parse -in pub-key.der -inform der
The added "header" are simply the first 22 bytes.
(not 21 (=18+3) - there is in correctly formated pub-key 1 byte 00h on
begin of BIT STRING. Don't know why.)
The BIT STRING is yours pubkey.bin.
I hope it will help :-)
--kapetr
Dne 24.1.2013 18:25, Tovey, Dwight (LaserJet R&D FW Eng.) napsal(a):
On Jan 23, 2013, at 4:18 PM, kap...@mizera.cz wrote:
I have build the whole pub-key (in DER) from yours pubkey.bin by
adding public key header - as wrote w...@omnigroup.com
If I did not make error, it could work now - try it.
It is in attachment.
openssl asn1parse -in pub-key.der -inform der -strparse 18
and you will see the same as by parsing yours pubkey.bin.
To see whole public key structure:
openssl asn1parse -in pub-key.der -inform der
--kapetr
This worked. I translated the .der key into PEM format, which I was
then able to load into my python script with
M2Crypto.RSA.load_pub_key(). I could then use the resulting RSA_pub
object to encrypt my data and send it to the device.
So, my next question is, how did you add the public key header? What
does this header look like? If I know that then I should be able to
add it within my script and handle it all directly.
Thanks
Dwight Tovey
Laserjet R&D Engineer
dwight.to...@hp.com
(208)396-4645
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