c++ - ECDSA 未正确签名/验证

Question

我目前在使用 Crypto++ 签署/验证字符串时遇到问题。我已经尝试了这个网站上列出的方法几个月，但没有成功。我之前尝试过这里发布的 C 风格解决方案:http://www.cryptopp.com/wiki/Elliptic_Curve_Digital_Signature_Algorithm ，但目前正在使用过滤器进行实现。

我下面的尝试是对此处发布的解决方案的修改:Get ECDSA signature with Crypto++ .

以下代码输出错误: 错误:VerifierFilter:数字签名无效

ECDSA<ECP, SHA256>::PrivateKey privateKey;
ECDSA<ECP, SHA256>::PublicKey publicKey;

AutoSeededRandomPool prng, rrng;

privateKey.Initialize(prng, CryptoPP::ASN1::secp256k1());

privateKey.MakePublicKey(publicKey);

string signature;

signature.erase();

string message = "Do or do not. There is no try.";

StringSource(message, true,
     new SignerFilter(rrng,
     ECDSA<ECP, SHA256>::Signer(privateKey),
     new StringSink(signature)));

 try
 {
     StringSource(signature + message, true,
         new SignatureVerificationFilter(
         ECDSA<ECP, SHA256>::Verifier(publicKey), NULL,
         SignatureVerificationFilter::THROW_EXCEPTION
         ) // SignatureVerificationFilter   
         ); // StringSource 
 }
 catch (CryptoPP::Exception& e)
 {
     std::cerr << "\n\nERROR: " << e.what() << std::endl;
 }

感谢任何帮助，谢谢。

Answer 1

在长时间浏览 Wiki 之后，我想我可能偶然发现了解决方案。

http://www.cryptopp.com/wiki/SignatureVerificationFilter#Signature_Generation_and_Verification

In the example above, the filter receives a concatenation of message+signature. When SIGNATURE_AT_BEGIN is not specified in the constructor, SIGNATURE_AT_END is implied and the signature to be verified must be presented after the message. If the signature is inserted first, SIGNATURE_AT_BEGIN must be be specified as an additional flags value as shown below.

因为使用了THROW_EXCEPTION，所以signature和message必须互换，或者必须添加SIGNATURE_AT_BEGIN。在这种情况下，以下代码不会抛出异常。

StringSource ss(signature + message, true,
    new SignatureVerificationFilter(
    verifier, NULL,
    THROW_EXCEPTION | SIGNATURE_AT_BEGIN
        ) // SignatureVerificationFilter   
        ); // StringSource