Question

我正在使用Windows CNG API编写自定义OpenSSL引擎。在实现nlp = spacy.load('en') text_data = u'This is a text document that speaks about entities like Sweden and Nokia' document = nlp(text_data) text_no_namedentities = [] for word in document: if word not in document.ents: text_no_namedentities.append(word) return " ".join(text_no_namedentities)以生成和使用ECDH密钥时，我遇到了将密钥从OpenSSL EVP_PKEY_meths转换为CNG EVP_PKEY的问题，反之亦然。在实现Keygen和Derive功能时，我面临着这种情况。有没有简单的方法可以执行这些转换？

Answer 1

我只使用RSA私钥来做到这一点，但是我假设其他类型（例如ECC）将遵循导出密钥参数并将其导入的相同原理。

我使用BCryptExportKey导出私钥数据，并使用BCryptImportKeyPair在win32端导入数据。在openssl方面，我使用“ set”类型调用来设置密钥数据（例如“ RSA_set0_crt_params”）以设置RSA密钥。

这是我将RSA私钥的BCRYPT_KEY_HANDLE转换为EVP_PKEY的示例。反之类似。它不能满足您的特定ECDH要求，但我认为与您处理ECC私钥/公钥详细信息而不是RSA密钥详细信息大致相同。

EVP_PKEY* extract_private_key(const BCRYPT_KEY_HANDLE key_handle)
{
    EVP_PKEY* pkey = nullptr;
    DWORD length = 0;
    if(SUCCEEDED(BCryptExportKey(key_handle, NULL, BCRYPT_RSAFULLPRIVATE_BLOB, nullptr, 0, &length, 0)))
    {
        auto data = std::make_unique<BYTE[]>(length);

        if(SUCCEEDED(BCryptExportKey(key_handle, NULL, BCRYPT_RSAFULLPRIVATE_BLOB, data.get(), length, &length, 0)))
        {
            // https://docs.microsoft.com/en-us/windows/desktop/api/bcrypt/ns-bcrypt-_bcrypt_rsakey_blob
            auto const blob = reinterpret_cast<BCRYPT_RSAKEY_BLOB*>(data.get());

            if(blob->Magic == BCRYPT_RSAFULLPRIVATE_MAGIC)
            {
                auto rsa = RSA_new();

                // n is the modulus common to both public and private key
                auto const n = BN_bin2bn(data.get() + sizeof(BCRYPT_RSAKEY_BLOB) + blob->cbPublicExp, blob->cbModulus, nullptr);
                // e is the public exponent
                auto const e = BN_bin2bn(data.get() + sizeof(BCRYPT_RSAKEY_BLOB), blob->cbPublicExp, nullptr);
                // d is the private exponent
                auto const d = BN_bin2bn(data.get() + sizeof(BCRYPT_RSAKEY_BLOB) + blob->cbPublicExp + blob->cbModulus + blob->cbPrime1 + blob->cbPrime2 + blob->cbPrime1 + blob->cbPrime2 + blob->cbPrime1, blob->cbModulus, nullptr);

                RSA_set0_key(rsa, n, e, d);

                // p and q are the first and second factor of n
                auto const p = BN_bin2bn(data.get() + sizeof(BCRYPT_RSAKEY_BLOB) + blob->cbPublicExp + blob->cbModulus, blob->cbPrime1, nullptr); 
                auto const q = BN_bin2bn(data.get() + sizeof(BCRYPT_RSAKEY_BLOB) + blob->cbPublicExp + blob->cbModulus + blob->cbPrime1, blob->cbPrime2, nullptr); 

                RSA_set0_factors(rsa, p, q);

                // dmp1, dmq1 and iqmp are the exponents and coefficient for CRT calculations
                auto const dmp1 = BN_bin2bn(data.get() + sizeof(BCRYPT_RSAKEY_BLOB) + blob->cbPublicExp + blob->cbModulus + blob->cbPrime1 + blob->cbPrime2, blob->cbPrime1, nullptr); 
                auto const dmq1 = BN_bin2bn(data.get() + sizeof(BCRYPT_RSAKEY_BLOB) + blob->cbPublicExp + blob->cbModulus + blob->cbPrime1 + blob->cbPrime2 + blob->cbPrime1, blob->cbPrime2, nullptr); 
                auto const iqmp = BN_bin2bn(data.get() + sizeof(BCRYPT_RSAKEY_BLOB) + blob->cbPublicExp + blob->cbModulus + blob->cbPrime1 + blob->cbPrime2 + blob->cbPrime1 + blob->cbPrime2, blob->cbPrime1, nullptr); 

                RSA_set0_crt_params(rsa, dmp1, dmq1, iqmp);

                pkey = EVP_PKEY_new();

                // ownership of rsa transferred to pkey
                EVP_PKEY_assign_RSA(pkey, rsa);
            }
        }
    }

    return pkey;
}

如何将CNG密钥转换为OpenSSL EVP_PKEY（反之亦然）？

1 个答案: