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| 1 | +// Copyright 2026 Google LLC |
| 2 | +// |
| 3 | +// Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | +// you may not use this file except in compliance with the License. |
| 5 | +// You may obtain a copy of the License at |
| 6 | +// |
| 7 | +// https://www.apache.org/licenses/LICENSE-2.0 |
| 8 | +// |
| 9 | +// Unless required by applicable law or agreed to in writing, software |
| 10 | +// distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | +// See the License for the specific language governing permissions and |
| 13 | +// limitations under the License. |
| 14 | + |
| 15 | +#ifndef _WIN32 |
| 16 | +#include "google/cloud/internal/ssl_ec_curves.h" |
| 17 | +#include <openssl/ec.h> |
| 18 | +#include <openssl/ssl.h> |
| 19 | +#include <array> |
| 20 | + |
| 21 | +namespace google { |
| 22 | +namespace cloud { |
| 23 | +namespace rest_internal { |
| 24 | +GOOGLE_CLOUD_CPP_INLINE_NAMESPACE_BEGIN |
| 25 | + |
| 26 | +std::vector<std::string> AvailableCryptoGroups() { |
| 27 | + std::vector<std::string> groups; |
| 28 | +#if OPENSSL_VERSION_NUMBER >= 0x30500000L |
| 29 | + SSL_CTX* ctx = SSL_CTX_new(TLS_method()); |
| 30 | + if (!ctx) return groups; |
| 31 | + STACK_OF(OPENSSL_CSTRING)* names = sk_OPENSSL_CSTRING_new_null(); |
| 32 | + if (SSL_CTX_get0_implemented_groups(ctx, 1, names) > 0) { |
| 33 | + int const num_names = sk_OPENSSL_CSTRING_num(names); |
| 34 | + for (int i = 0; i < num_names; ++i) { |
| 35 | + char const* name = sk_OPENSSL_CSTRING_value(names, i); |
| 36 | + if (name != nullptr) groups.emplace_back(name); |
| 37 | + } |
| 38 | + } |
| 39 | + sk_OPENSSL_CSTRING_free(names); |
| 40 | + SSL_CTX_free(ctx); |
| 41 | +#else // OPENSSL_VERSION_NUMBER >= 0x30500000L |
| 42 | + size_t const num_curves = EC_get_builtin_curves(nullptr, 0); |
| 43 | + std::vector<EC_builtin_curve> builtin(num_curves); |
| 44 | + EC_get_builtin_curves(builtin.data(), num_curves); |
| 45 | + for (auto const& c : builtin) { |
| 46 | + char const* name = OBJ_nid2sn(c.nid); |
| 47 | + if (name != nullptr) groups.emplace_back(name); |
| 48 | + } |
| 49 | +#ifdef OPENSSL_IS_BORINGSSL |
| 50 | + // boringssl reports these curves as available, but then errors when trying to |
| 51 | + // use them. Remove them from the list. |
| 52 | + std::array<std::string_view, 1> constexpr kFiltered{"secp224r1"}; |
| 53 | + auto const it = std::remove_if(groups.begin(), groups.end(), [&](auto name) { |
| 54 | + return std::find(kFiltered.begin(), kFiltered.end(), name) != |
| 55 | + kFiltered.end(); |
| 56 | + }); |
| 57 | + groups.erase(it, groups.end()); |
| 58 | + |
| 59 | + groups.emplace_back("X25519"); |
| 60 | + groups.emplace_back("X25519MLKEM768"); |
| 61 | + groups.emplace_back("X25519Kyber768Draft00"); |
| 62 | +#endif // OPENSSL_IS_BORINGSSL |
| 63 | +#endif // OPENSSL_VERSION_NUMBER >= 0x30500000L |
| 64 | + return groups; |
| 65 | +} |
| 66 | + |
| 67 | +GOOGLE_CLOUD_CPP_INLINE_NAMESPACE_END |
| 68 | +} // namespace rest_internal |
| 69 | +} // namespace cloud |
| 70 | +} // namespace google |
| 71 | +#endif // _WIN32 |
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