Re: DEREncode issue when upgrading from 5.6.3 to 8.2.0.

On Wed, Feb 24, 2021 at 4:16 PM Bart Vandewoestyne
<[email protected]> wrote:
>
> Hello list,
>
> I am currently upgrading our Crypto++ from 5.6.3 to 8.2.0.  We have some code that compiled fine under 5.6.3, but breaks under 8.2.0.  To me, it looks like code that creates a Base64 encoded private/public keypair or something:
>
>         CryptoPP::RSAES_OAEP_SHA_Decryptor Decryptor(rng, nrOfBits /*, e */);
>         CryptoPP::Base64Encoder priv(new
>             CryptoPP::StringSink(privateKey)); // Base64 Encoder
>         Decryptor.DEREncode(priv);
>         priv.MessageEnd();
>
>         CryptoPP::RSAES_OAEP_SHA_Encryptor Encryptor(Decryptor);
>         CryptoPP::Base64Encoder pub(new
>             CryptoPP::StringSink(publicKey)); // Base64 Encoder
>         Encryptor.DEREncode(pub);
>         pub.MessageEnd();
>
> The problem is the calls to DEREncode that worked with 5.6.3 but with 8.2.0 give the error:
>
> 1>... blabla.../PPKStringEncryption.cpp(32,13): error C2039: 'DEREncode': is not a member of 'CryptoPP::PK_FinalTemplate<CryptoPP::TF_DecryptorImpl<CryptoPP::TF_CryptoSchemeOptions<ALG_INFO,KEYS,CryptoPP::OAEP<CryptoPP::SHA1,CryptoPP::P1363_MGF1>>>>'
> 1>        with
> 1>        [
> 1>            ALG_INFO=CryptoPP::TF_ES<CryptoPP::RSA,CryptoPP::OAEP<CryptoPP::SHA1,CryptoPP::P1363_MGF1>,int>,
> 1>            KEYS=CryptoPP::RSA
> 1>        ]
> 1>...blabla...\ThirdParty\CryptoPP\CryptoPP-custom\pubkey.h(2238): message : see declaration of 'CryptoPP::PK_FinalTemplate<CryptoPP::TF_DecryptorImpl<CryptoPP::TF_CryptoSchemeOptions<ALG_INFO,KEYS,CryptoPP::OAEP<CryptoPP::SHA1,CryptoPP::P1363_MGF1>>>>'
> 1>        with
> 1>        [
> 1>            ALG_INFO=CryptoPP::TF_ES<CryptoPP::RSA,CryptoPP::OAEP<CryptoPP::SHA1,CryptoPP::P1363_MGF1>,int>,
> 1>            KEYS=CryptoPP::RSA
> 1>        ]
>
> I think it has to do with this GitHub issue about removing AsymmetricAlgorithm::BERDecode:
>
> https://github.com/weidai11/cryptopp/issues/569
>
> but since the code is heavily templatized and I do not consider myself a template expert, I don't know with what to replace the DEREncode calls...  Any help on that would be appreciated!

I vaguely remember that change. According to the change in
https://github.com/weidai11/cryptopp/commit/9b174e84de7a, you should
be able to:

    AccessMaterial().Load(bt)
or
    AccessMaterial().Save(bt)

In you case, use the Encryptor object:

    Encryptor.AccessMaterial().Save(pub);

Jeff

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