My code is like this:

        StringSource privateKey( defaultPrivateKey, defaultPrivateKeyLength,
true);

        CryptoPP::RSA::PrivateKey rsapk;
        rsapk.Load(privateKey);
        LC_RNG rng( 0 ); // ignored for RSA -- but not for others if you ever
use another signer
        CryptoPP::RSASSA_PKCS1v15_SHA_Signer signer( rsapk );
        std::string signature;
        StringSource m(buf, fsize, true,
                new SignerFilter(rng, signer,
                new StringSink( signature)
                )//SignerFilter
                );//StringSource

but it throws a BERDecodeErr when it gets to the line rsapk.Load
(privateKey);  at which point privateKey.m_store has a first byte of
0, just as BERDecode expects, but inside the Load function the
BufferedTransformation& bt parameter of the Load function has an
invalid m_buf ... so the real error here seems to be how to get the
StringSource to a BufferedTransformation correctly, right?

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