Problems with ECC ECIES

[vincent miethe]

hi,

first of all: it�s my 2. day with crypto++ ...
ok, my question. i want do generate a keypair
with ECIES. the keylength should be 228bit.
at least, i need the keys as char or unsigned char.
that for i use the following code:

   AutoSeededRandomPool *arng = new AutoSeededRandomPool;
   RandomNumberGenerator &rng = *dynamic_cast<RandomNumberGenerator 
*>(arng);
   
   // Create a random private key
   ECIES<ECP>::PrivateKey privkey;
   privkey.Initialize(rng, ASN1::secp224k1()); //or secp224r1?
   
   // Get the public key
   ECIES<ECP>::PublicKey pubkey;
   privkey.MakePublicKey(pubkey);
   
is that the right code? what happend next to
convert it into char? what about the keylength?
sizeof(privkey) = 228
sizeof(pubkey) = 292???

thanks,
vm