AuroraRuntime/Source/Crypto/RSA/RSA.hpp

/***
    Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: RSA.hpp
    Date: 2021-7-1
    Author: Reece
***/
#pragma once
#include "../Crypto.hpp"

namespace Aurora::Crypto::RSA
{
    static bool ExportRSAKey(const rsa_key &key, EKeyType side, ERSAKeyType type, Memory::ByteBuffer &out)
    {
        int flags = 0;

        if (type == ERSAKeyType::eRsaKey)
        {
            flags |= kRsaFlagPKCS1;
        }

        if (side == EKeyType::eKeyPublic)
        {
            flags |= kRsaFlagPublic;
        }

        if (!AuTryResize(out, 4096))
        {
            return false;
        }

        unsigned long actualSize = out.size();
        auto ret = rsa_pkcs8_export(out.writePtr, &actualSize, &key, flags);

        if (ret != CRYPT_OK)
        {
            SysPushErrorCrypt("{}", ret);
            return false;
        }

        out.writePtr += actualSize;
        return true;
    }
    
    static bool ImportRSAKey(rsa_key &in, const RSAKey &rsakey)
    {
        int flags{};
    
        if (rsakey.meta.encoding == ERSAKeyType::eCert)
        {
            if (rsakey.meta.type == EKeyType::eKeyPrivate)
            {
                SysPushErrorArg("Attempted to import a certificate as a private key.");
                return false;
            }

            auto ret = rsa_import_x509(rsakey.blob.data(), rsakey.blob.size(), &in);
            if (ret != CRYPT_OK)
            {
                SysPushErrorCrypt("{}", ret);
                return false;
            }

            return true;
        }

        if (rsakey.meta.encoding == ERSAKeyType::eRsaKey)
        {
            flags |= kRsaFlagPKCS1;
        }

        if (rsakey.meta.type == EKeyType::eKeyPublic)
        {
            flags |= kRsaFlagPublic;
        }

        auto ret = rsa_import_ex(rsakey.blob.data(), rsakey.blob.size(), &in, flags);
        if (ret != CRYPT_OK)
        {
            SysPushErrorCrypt("{}", ret);
            return false;
        }

        return true;
    }
}