Ok, i've managed to convert the bytes to Integers and use function 
DEREncode with BufferedTransformation (FileSink). But when I try to load 
the keys with BERDecode... this happens: 
terminate called after throwing an instance of 'CryptoPP::BERDecodeErr'
  what():  BER decode error

I've tried this:
    string filename5 = "ecc-pubkeyA.der";
    string filename6 = "ecc-pubkeyB.der";
    FileSource fs5(filename5.c_str(), true);
    FileSource fs6(filename6.c_str(), true);
    Integer pubkey_A(fs5);
    Integer pubkey_B(fs6);

and this:
    Integer pubkey_A(pubA, dhA.PublicKeyLength());
    Integer pubkey_B(pubB, dhB.PublicKeyLength());
    string filename5 = "ecc-pubkeyA.der";
    string filename6 = "ecc-pubkeyB.der";
    FileSource fs5(filename5.c_str(), true);
    FileSource fs6(filename6.c_str(), true);
    pubkey_A.BERDecode(fs5);
    pubkey_B.BERDecode(fs6);

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