Hello,
> My question is: how many bytes does public key(EC or RSA) takes in X509
> certificate ? 64B for EC and 162B for RSA. Does X509 contain whole RSA
> public key structure(162) in itself or only 1024bit modulus and 4 bytes for
> exponent ? Does
Public key for RSA in X509 contains ASN.1 SEQUENCE of INTEGER modulus
and INTEGER public_exponent. Look at RFC2459 7.3.1
For EC you may simply check:
$ openssl ec -in ec-key.pem -text -noout
Private-Key: (224 bit)
priv:
47:ed:fe:43:2b:1a:7f:27:ed:e3:99:0a:5b:af:e7:
33:03:cc:5a:2f:da:b9:a3:06:e8:3f:d6:7d
pub:
04:ca:77:df:dc:af:86:a7:e0:a0:4f:c2:29:5d:fc:
be:0b:75:60:ca:7c:a2:f8:bf:0d:4e:53:f2:cf:1e:
5a:98:02:a7:72:e0:3e:34:9c:04:fe:fa:1c:f4:1a:
c9:26:1b:0a:8f:5d:a2:fb:73:32:0c:a4
ASN1 OID: secp224r1
$ openssl req -new -key ec-key.pem -out req.pem
$ openssl asn1parse -in req.pem -dump
....
80:d=2 hl=2 l= 78 cons: SEQUENCE
82:d=3 hl=2 l= 16 cons: SEQUENCE
84:d=4 hl=2 l= 7 prim: OBJECT :id-ecPublicKey
93:d=4 hl=2 l= 5 prim: OBJECT :secp224r1
100:d=3 hl=2 l= 58 prim: BIT STRING
0000 - 00 04 ca 77 df dc af 86-a7 e0 a0 4f c2 29 5d
fc ...w.......O.)].
0010 - be 0b 75 60 ca 7c a2 f8-bf 0d 4e 53 f2 cf 1e
5a ..u`.|....NS...Z
0020 - 98 02 a7 72 e0 3e 34 9c-04 fe fa 1c f4 1a c9
26 ...r.>4........&
0030 - 1b 0a 8f 5d a2 fb 73 32-0c
a4 ...]..s2..
160:d=2 hl=2 l= 0 cons: cont [ 0 ]
....
Best regards,
--
Marek Marcola <[EMAIL PROTECTED]>
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