c++ - 在 Crypto++ 中从内存中加载 key

Question

我正在尝试将公共(public) DLIES key 保存到内存中，然后再次读取它，但我不断收到异常 BER decode error .我用 ArraySink , ArraySource和一个 char[64]在两个 CryptoPP::DLIES<>::PublicKey 之间传输 key 的缓冲区.我什至验证公钥是好的。我错过了什么？

下面是无法正常工作的完整示例。如何修改它以便正确加载 key ？

#include <iostream>
#include <gfpcrypt.h>
#include <filters.h>
#include <osrng.h>

int main() {
    try {
        CryptoPP::DefaultAutoSeededRNG rng;

        CryptoPP::DLIES<>::PrivateKey privateKey;
        privateKey.GenerateRandomWithKeySize(rng, 10);

        CryptoPP::DLIES<>::PublicKey publicKey;
        privateKey.MakePublicKey(publicKey);

        if (!publicKey.Validate(rng, 3)) {
            std::cout << "Something wrong with public key." << std::endl;
            return 1;
        }

        byte buf[64];
        CryptoPP::ArraySink sink(buf, 64);
        publicKey.Save(sink);

        CryptoPP::ArraySource source((const char *)buf, sink.TotalPutLength());
        CryptoPP::DLIES<>::PublicKey pk;
        pk.Load(source);
    } catch (CryptoPP::Exception &ex) {
        std::cout << ex.what() << std::endl;
        return 1;
    }

    return 0;
}

Answer 1

问题在于未设置 ArraySource 构造函数的 pumpAll=true 第 3 个参数。添加后，它起作用了。另一个可行的解决方案是改用 ByteQueue。为了完整起见，我在下面粘贴了两个工作示例。

ArraySource 版本:

#include <iostream>
#include <gfpcrypt.h>
#include <filters.h>
#include <osrng.h>

int main() {
    try {
        CryptoPP::DefaultAutoSeededRNG rng;

        CryptoPP::DLIES<>::PrivateKey privateKey;
        privateKey.GenerateRandomWithKeySize(rng, 10);

        CryptoPP::DLIES<>::PublicKey publicKey;
        privateKey.MakePublicKey(publicKey);

        if (!publicKey.Validate(rng, 3)) {
            std::cout << "Something wrong with sent public key." << std::endl;
            return 1;
        }

        byte buf[64];
        CryptoPP::ArraySink sink(buf, 64);
        publicKey.Save(sink);

        CryptoPP::ArraySource source(buf, sink.TotalPutLength(), true);
        CryptoPP::DLIES<>::PublicKey pk;
        pk.Load(source);

        if (!pk.Validate(rng, 3)) {
            std::cout << "Something wrong with received public key." << std::endl;
            return 1;
        }
    } catch (CryptoPP::Exception &ex) {
        std::cout << ex.what() << std::endl;
        return 1;
    }

    return 0;
}

ByteQueue 版本(我最后发现更方便):

#include <iostream>
#include <gfpcrypt.h>
#include <filters.h>
#include <osrng.h>

int main() {
    try {
        CryptoPP::DefaultAutoSeededRNG rng;

        CryptoPP::DLIES<>::PrivateKey privateKey;
        privateKey.GenerateRandomWithKeySize(rng, 10);

        CryptoPP::DLIES<>::PublicKey publicKey;
        privateKey.MakePublicKey(publicKey);

        if (!publicKey.Validate(rng, 3)) {
            std::cout << "Something wrong with sent public key." << std::endl;
            return 1;
        }

        CryptoPP::ByteQueue queue;
        publicKey.Save(queue);
        CryptoPP::lword size = queue.TotalBytesRetrievable();

        byte buf[64];
        queue.Get(buf, size);

        CryptoPP::ByteQueue queue2;
        queue2.Put(buf, size);
        CryptoPP::DLIES<>::PublicKey pk;
        pk.Load(queue2);

        if (!pk.Validate(rng, 3)) {
            std::cout << "Something wrong with received public key." << std::endl;
            return 1;
        }
    } catch (CryptoPP::Exception &ex) {
        std::cout << ex.what() << std::endl;
        return 1;
    }

    return 0;
}