the problem was between the keyboard and the chair :-)
I picked the worst moment to mix up Alice and Bob... the OpenSSL d2i/i2d functions provided have no problems at all.
Cheers,
Jordi
2006/11/3, Nils Larsch <[EMAIL PROTECTED]>:
Jordi Jaen Pallares wrote:
> Dear list,
>
> I used the "ecdhtest.c" file as starting point to write a small test
> application to do ECDH key exchange over a network.
>
> In order to encode the peer's public keys in a TCP message I used the
> i2d_EC_PUBKEY_bio functions to write the
> public keys to memory BIOs, and from the BIOs to the TCP messages.
>
> The received bytes were copied to another BIO, and then decoded with
> d2i_EC_PUBKEY_bio without errors.
>
> The problem is that the procedure ECDH_compute_key yields different key
> values for both peers !
>
> I have tryed to simulate this behaviour locally , this is, using a
> "unsigned char " buffer instead a TCP message and
> the results were reproduceable.
>
> Then I tried with the d2i/i2d_EC_PUBKEY_fp functions and it yielded the
> same ECDH key in both peers.
> Also, it worked :-)
>
> As said, the only relevant change in the program was exchanging the *bio
> for the *fp procedures and it worked.
>
> Am I missing something ?
don't know what you are precisely doing. Could you give us a code sample ?
Cheers,
Nils
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