I need to perform ECDH.
The data I am given to initialize things are in ASN1 as (I added some
comments to it for help):
SEQUENCE {
OBJECT IDENTIFIER ecPublicKey (1 2 840 10045 2 1)
SEQUENCE
{
INTEGER 1 -----> Version=1
SEQUENCE
{
OBJECT IDENTIFIER prime-field (1 2 840 10045 1 1)
INTEGER -----> prime 'p'
00 D7 C1 34 AA 26 43 66 86 2A 18 30 25 75 D1 D7
87 B0 9F 07 57 97 DA 89 F5 7E C8 C0 FF
}
SEQUENCE ------> curve equation
{
OCTET STRING -------> parameter 'a'
68 A5 E6 2C A9 CE 6C 1C 29 98 03 A6 C1 53 0B 51
4E 18 2A D8 B0 04 2A 59 CA D2 9F 43
OCTET STRING -------> parameter 'b'
25 80 F6 3C CF E4 41 38 87 07 13 B1 A9 23 69 E3
3E 21 35 D2 66 DB B3 72 38 6C 40 0B
}
OCTET STRING -------> encoded group generator 'G'
04 0D 90 29 AD 2C 7E 5C F4 34 08 23 B2 A8 7D C6
8C 9E 4C E3 17 4C 1E 6E FD EE 12 C0 7D 58 AA 56
F7 72 C0 72 6F 24 C6 B8 9E 4E CD AC 24 35 4B 9E
99 CA A3 F6 D3 76 14 02 CD
INTEGER -------> group order 'n'
00 D7 C1 34 AA 26 43 66 86 2A 18 30 25 75 D0 FB
98 D1 16 BC 4B 6D DE BC A3 A5 A7 93 9F
INTEGER 1 -------> cofactor 'f'
}
}
Once I parse these parameters and put them into "Integer", etc, how do
I pass them into crypto++ to the ECDH object?
Is there any way to do this by passing the entire data above without
passing each individual piece?
I have started using:
DL_GroupParameters_EC<ECP> gp;
ECDH<ECP>::Domain m_ecdh(gp);
but need to call Initialize or similar like (I'm showing the
declaration below):
gp.Initialize(const EllipticCurve &ec,
const Point &G,
const Integer &n,
const Integer &k = Integer::Zero())
What is 'k'? don't I need to pass 'p', 'a', 'b'? otherwise why would
they be given to me?
Maybe 'p', 'a' and 'b' are part of the first parameter "EllipticCurve
&ec"?
Any sample code would be really appretiated! Thank you!
Christian
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