c++ - 如何创建用户密码哈希

Question

我们正在转换代码以使用 Crypto++ 库。为我们的用户创建一个散列密码是必要的吗？只是想确保我们没有遗漏一些重要的部分。谢谢你

void test_create_hash(void)
{
   using namespace CryptoPP;
   std::string password = "this is a users password";
   unsigned int iterations = 1000000;

   AutoSeededRandomPool rng;

   SecByteBlock pwsalt(AES::DEFAULT_KEYLENGTH);
   rng.GenerateBlock(pwsalt,pwsalt.size());

   SecByteBlock derivedkey(AES::DEFAULT_KEYLENGTH);

   PKCS5_PBKDF2_HMAC<SHA256> pbkdf;

   pbkdf.DeriveKey(
      derivedkey, derivedkey.size(),
      0x00,
      (byte *) password.data(), password.size(),
      pwsalt, pwsalt.size(),
      iterations
   );
   std::string salthex;
   StringSource ss1(pwsalt,pwsalt.size(),true,
          new HexEncoder(
             new StringSink(salthex)
          )
        );
   std::string derivedhex;
   StringSource ss2(derivedkey,derivedkey.size(),true,
          new HexEncoder(
             new StringSink(derivedhex)
          )
        );

   cout << "salt stored to database:" << salthex << std::endl;
   cout << "password stored to database:" << derivedhex << std::endl;
}

Answer 1

一些评论...

SecByteBlock pwsalt(AES::DEFAULT_KEYLENGTH);
SecByteBlock derivedkey(AES::DEFAULT_KEYLENGTH);

AES 怎么了？也许:

SecByteBlock pwsalt(SHA256::DIGEST_SIZE);
SecByteBlock derivedkey(SHA256::DIGEST_SIZE);

如果您想继续使用 AES，CMAC 可以正常工作。

---

std::string salthex;
StringSource ss(pwsalt,pwsalt.size(),true,
    new HexEncoder(
        new StringSink(salthex)
    )
);

您不应使用匿名声明。它会给某些 GCC 版本带来麻烦。也就是说，命名您的 StringSource。

std::string salthex;
StringSource ss(pwsalt,pwsalt.size(),true,
    new HexEncoder(
        new StringSink(salthex)
    )
);