c++ - Crypto++ 验证大文件签名

Question

我使用此代码通过 crypto++ 验证消息:

CryptoPP::ECDSA<CryptoPP::ECP, CryptoPP::SHA256>::Verifier verifier(key);
bool result = verifier.VerifyMessage( (const CryptoPP::byte*)message.data(), message.length(), (const CryptoPP::byte*)signature.data(), signature.length() );

现在我想验证我之前为文件创建的签名。该文件很大 (GB)，我不想将它一次性加载到内存中(到消息变量)。

crypto++ 有没有办法验证大文件的签名？

Answer 1

这段代码可以满足我的需要:

 CryptoPP::ECDSA<CryptoPP::ECP, CryptoPP::SHA256>::PublicKey key; key.Load(queue);
 CryptoPP::ECDSA<CryptoPP::ECP, CryptoPP::SHA256>::Verifier verifier(key);

 CryptoPP::SignatureVerificationFilter verificationFilter(verifier, NULL, CryptoPP::SignatureVerificationFilter::SIGNATURE_AT_BEGIN);
 CryptoPP::FileSource fileSource( file, false, new CryptoPP::Redirector(verificationFilter));
 CryptoPP::StringSource signatureSource( (const CryptoPP::byte*)signature.data(), signature.length(), false, new CryptoPP::Redirector(verificationFilter));
 signatureSource.Pump(signature.length());
 fileSource.PumpAll();

 return verificationFilter.GetLastResult();