On Tue, Nov 09, 2010 at 09:34:42PM +0100, Stef Hoeben wrote:
> Hi,
>
> using the openssl tool, we generated an Elliptic Curve key pair
> and put it into a pkcs8 file:
>
> 0 48: SEQUENCE {
> 3 2: INTEGER 0
> 6 48: SEQUENCE {
> 8 6: OBJECT IDENTIFIER ecPublicKey (1 2 840 10045 2 1)
> 17 6: OBJECT IDENTIFIER '1 2 840 10045 3 1 7'
> : }
> 27 4: OCTET STRING, encapsulates {
> ...
>
> However, instead of the 2nd object identifier (that tells which
> EC it is), we'd need the domain parameters of the EC themselves.
>
> It this possible with the openssl tool -- or with openssl itself?
Have you looked at the ecparam(1) manpage?
...
-param_enc arg
This specifies how the elliptic curve parameters are encoded.
Possible value are: named_curve, i.e. the ec parameters are speci-
fied by a OID, or explicit where the ec parameters are explicitly
given (see RFC 3279 for the definition of the EC parameters struc-
tures). The default value is named_curve. Note the implicitlyCA
alternative ,as specified in RFC 3279, is currently not imple-
mented in OpenSSL.
Example (1.0.0a):
$ openssl ecparam -genkey -name prime256v1 -text -param_enc explicit
Field Type: prime-field
Prime:
00:ff:ff:ff:ff:00:00:00:01:00:00:00:00:00:00:
00:00:00:00:00:00:ff:ff:ff:ff:ff:ff:ff:ff:ff:
ff:ff:ff
A:
00:ff:ff:ff:ff:00:00:00:01:00:00:00:00:00:00:
00:00:00:00:00:00:ff:ff:ff:ff:ff:ff:ff:ff:ff:
ff:ff:fc
B:
5a:c6:35:d8:aa:3a:93:e7:b3:eb:bd:55:76:98:86:
bc:65:1d:06:b0:cc:53:b0:f6:3b:ce:3c:3e:27:d2:
60:4b
Generator (uncompressed):
04:6b:17:d1:f2:e1:2c:42:47:f8:bc:e6:e5:63:a4:
40:f2:77:03:7d:81:2d:eb:33:a0:f4:a1:39:45:d8:
98:c2:96:4f:e3:42:e2:fe:1a:7f:9b:8e:e7:eb:4a:
7c:0f:9e:16:2b:ce:33:57:6b:31:5e:ce:cb:b6:40:
68:37:bf:51:f5
Order:
00:ff:ff:ff:ff:00:00:00:00:ff:ff:ff:ff:ff:ff:
ff:ff:bc:e6:fa:ad:a7:17:9e:84:f3:b9:ca:c2:fc:
63:25:51
Cofactor: 1 (0x1)
Seed:
c4:9d:36:08:86:e7:04:93:6a:66:78:e1:13:9d:26:
b7:81:9f:7e:90
-----BEGIN EC PARAMETERS-----
MIH3AgEBMCwGByqGSM49AQECIQD/////AAAAAQAAAAAAAAAAAAAAAP//////////
/////zBbBCD/////AAAAAQAAAAAAAAAAAAAAAP///////////////AQgWsY12Ko6
k+ez671VdpiGvGUdBrDMU7D2O848PifSYEsDFQDEnTYIhucEk2pmeOETnSa3gZ9+
kARBBGsX0fLhLEJH+Lzm5WOkQPJ3A32BLeszoPShOUXYmMKWT+NC4v4af5uO5+tK
fA+eFivOM1drMV7Oy7ZAaDe/UfUCIQD/////AAAAAP//////////vOb6racXnoTz
ucrC/GMlUQIBAQ==
-----END EC PARAMETERS-----
-----BEGIN EC PRIVATE KEY-----
MIIBaAIBAQQgHqdKw3PmrxxFzUr4JFjFetuHhG2kT/nnkFyqVBFKSn2ggfowgfcC
AQEwLAYHKoZIzj0BAQIhAP////8AAAABAAAAAAAAAAAAAAAA////////////////
MFsEIP////8AAAABAAAAAAAAAAAAAAAA///////////////8BCBaxjXYqjqT57Pr
vVV2mIa8ZR0GsMxTsPY7zjw+J9JgSwMVAMSdNgiG5wSTamZ44ROdJreBn36QBEEE
axfR8uEsQkf4vOblY6RA8ncDfYEt6zOg9KE5RdiYwpZP40Li/hp/m47n60p8D54W
K84zV2sxXs7LtkBoN79R9QIhAP////8AAAAA//////////+85vqtpxeehPO5ysL8
YyVRAgEBoUQDQgAEXPmUSlKlJY/uhPRoOeeTloBgJsB3hlcHCNPU03tlMeoESWeM
MG4FoMedrrlTtt+oSJZ8uLt96gSZEUM380rXrg==
-----END EC PRIVATE KEY-----
--
Viktor.
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