Method Create

src/Thunks/bcrypt.hpp:726–771

        struct BCryptAlgorithmByCryptoAPI : BCryptAlgorithm
        {
            static NTSTATUS __fastcall Create(_In_ const BCryptMapItem* _pMapItem, _In_ ULONG _fOpenAlgorithmFlags, _Outptr_ BCryptAlgorithm** _ppAlgorithm)
            {
                *_ppAlgorithm = nullptr;

                HCRYPTPROV _hProv;
                do
                {
                    if (_pMapItem->uProvType == PROV_RSA_FULL || _pMapItem->uProvType == PROV_RSA_AES)
                    {
                        // Windows XP SP3才支持 MS_ENH_RSA_AES_PROV_XP_W
                        const auto _szEnhRsaAesProvider = internal::GetSystemVersion() < internal::MakeVersion(6, 0) ? MS_ENH_RSA_AES_PROV_XP_W : MS_ENH_RSA_AES_PROV_W;
                        if (CryptAcquireContextW(&_hProv, nullptr, _szEnhRsaAesProvider, PROV_RSA_AES, CRYPT_VERIFYCONTEXT))
                        {
                            break;
                        }

                        if (CryptAcquireContextW(&_hProv, nullptr, _szEnhRsaAesProvider, PROV_RSA_AES, CRYPT_NEWKEYSET))
                        {
                            break;
                        }
                    }

                    if (CryptAcquireContextW(&_hProv, nullptr, _pMapItem->szProvider, _pMapItem->uProvType, CRYPT_VERIFYCONTEXT))
                        break;

                    if (CryptAcquireContextW(&_hProv, nullptr, _pMapItem->szProvider, _pMapItem->uProvType, CRYPT_NEWKEYSET))
                        break;
                    
                    return STATUS_INVALID_PARAMETER;
                } while (false);

                const auto _hProcessHeap = ((TEB*)NtCurrentTeb())->ProcessEnvironmentBlock->ProcessHeap;
                auto _pBCryptAlgorithm = (BCryptAlgorithmType*)HeapAlloc(_hProcessHeap, 0, sizeof(BCryptAlgorithmType));
                if (!_pBCryptAlgorithm)
                {
                    CryptReleaseContext(_hProv, 0);
                    return STATUS_NO_MEMORY;
                }

                new (_pBCryptAlgorithm) BCryptAlgorithmType();
                _pBCryptAlgorithm->pMapItem = _pMapItem;
                _pBCryptAlgorithm->hProv = _hProv;
                _pBCryptAlgorithm->fOpenAlgorithmFlags = _fOpenAlgorithmFlags;
                *_ppAlgorithm = _pBCryptAlgorithm;
                return STATUS_SUCCESS;
            }
        };

        struct BCryptHash : public BCryptObject