On Tue, Jun 18, 2013, Aleix Ventayol wrote:
> Hi everyone,
>
> I'm using a Diffie Hellman Agreemant on one app. I've been able to generate
> the DH without any problems, but now I should send the DH information to
> the server.
>
> We've an example of the same process written in Java, what this app
> generates to send to the client is:
>
> SEQUENCE {
> SEQUENCE {
> OBJECTIDENTIFIER 1.2.840.113549.1.3.1
> SEQUENCE {
> INTEGER
> 0x00ffffffffffffffffc90fdaa22168c234c4c6628b80dc1cd129024e088a67cc74020bbea63b139b22514a08798e3404ddef9519b3cd3a431b302b0a6df25f14374fe1356d6d51c245e485b576625e7ec6f44c42e9a637ed6b0bff5cb6f406b7edee386bfb5a899fa5ae9f24117c4b1fe649286651ece45b3dc2007cb8a163bf0598da48361c55d39a69163fa8fd24cf5f83655d23dca3ad961c62f356208552bb9ed529077096966d670c354e4abc9804f1746c08ca18217c32905e462e36ce3be39e772c180e86039b2783a2ec07a28fb5c55df06f4c52c9de2bcbf6955817183995497cea956ae515d2261898fa051015728e5a8aacaa68ffffffffffffffff
> INTEGER 0x02 (2 decimal)
> }
> }
> BITSTRING
> 0x0282010100b9c13521bc982e69de3e139d2521f32187ca932fdb579344c37cf2a8effb1c589ac27446656c911aefb84c961be5c389cabae7012b9edbec439ce5b57df4ad427e8baaa334c18c8bbf0fc3b19b197d484ae174f3fb538183368cdb11ecc228fc3fbb0029ff9aa0c06ccebbba47c1d1208410e9506cc08ae3bdc71924e95ae74994268822637ad628af95cf8b09cba0e070c7a8126921f6a700792ef45d844b8812f4d67f19bbc809ad33ac1ea59f4e3a9542e26b3a5f1738de6b9f8092c5a323747a716f39a17f879b87981c00944c8e5fb8f1e4d5ace6c81c182f80711bc55865c8562688b7084ae42f706fb80081f9e97982ef0242df221b202cee9b9ffcaf
> : 0 unused bit(s)}
>
> >From my c++ app I try to get the same information using
> PEM_write_bio_DHparams. I get almost the same but without the BITSTRING
> and the OBJECTIDENTIFIER.
>
> SEQUENCE {
> INTEGER
> 0x00ffffffffffffffffc90fdaa22168c234c4c6628b80dc1cd129024e088a67cc74020bbea63b139b22514a08798e3404ddef9519b3cd3a431b302b0a6df25f14374fe1356d6d51c245e485b576625e7ec6f44c42e9a637ed6b0bff5cb6f406b7edee386bfb5a899fa5ae9f24117c4b1fe649286651ece45b3dc2007cb8a163bf0598da48361c55d39a69163fa8fd24cf5f83655d23dca3ad961c62f356208552bb9ed529077096966d670c354e4abc9804f1746c08ca18217c32905e462e36ce3be39e772c180e86039b2783a2ec07a28fb5c55df06f4c52c9de2bcbf6955817183995497cea956ae515d2261898fa051015728e5a8aacaa68ffffffffffffffff
> INTEGER 0x02 (2 decimal)}
>
> Any clue about where's the problem?
>
> I've seen that Java version generates a X.509 certificate to send the data,
> maybe I should generate a X509 certificate from the DH on my c++ version?
>
>
The DH_* functions don't support encoding of public and private keys,
PEM_write_bio_DHparams just writes DH parameters instead.
If you use the higher level EVP_PKEY API and something like i2d_PUBKEY it
should produce that format.
Steve.
--
Dr Stephen N. Henson. OpenSSL project core developer.
Commercial tech support now available see: http://www.openssl.org
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