| // Copyright 2019 Google Inc. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #include "tink/signature/ed25519_sign_key_manager.h" |
| |
| #include "absl/memory/memory.h" |
| #include "absl/status/status.h" |
| #include "absl/strings/str_cat.h" |
| #include "absl/strings/string_view.h" |
| #include "tink/internal/ec_util.h" |
| #include "tink/public_key_sign.h" |
| #include "tink/signature/ed25519_verify_key_manager.h" |
| #include "tink/subtle/ed25519_sign_boringssl.h" |
| #include "tink/util/enums.h" |
| #include "tink/util/errors.h" |
| #include "tink/util/input_stream_util.h" |
| #include "tink/util/protobuf_helper.h" |
| #include "tink/util/secret_data.h" |
| #include "tink/util/status.h" |
| #include "tink/util/statusor.h" |
| #include "tink/util/validation.h" |
| #include "proto/ed25519.pb.h" |
| |
| namespace crypto { |
| namespace tink { |
| |
| using ::crypto::tink::util::Status; |
| using ::crypto::tink::util::StatusOr; |
| using ::google::crypto::tink::Ed25519KeyFormat; |
| using ::google::crypto::tink::Ed25519PrivateKey; |
| |
| StatusOr<Ed25519PrivateKey> Ed25519SignKeyManager::CreateKey( |
| const Ed25519KeyFormat& key_format) const { |
| util::StatusOr<std::unique_ptr<internal::Ed25519Key>> key = |
| internal::NewEd25519Key(); |
| if (!key.ok()) { |
| return key.status(); |
| } |
| |
| Ed25519PrivateKey ed25519_private_key; |
| ed25519_private_key.set_version(get_version()); |
| ed25519_private_key.set_key_value((*key)->private_key); |
| |
| // Build Ed25519PublicKey. |
| auto ed25519_public_key = ed25519_private_key.mutable_public_key(); |
| ed25519_public_key->set_version(get_version()); |
| ed25519_public_key->set_key_value((*key)->public_key); |
| |
| return ed25519_private_key; |
| } |
| |
| StatusOr<std::unique_ptr<PublicKeySign>> |
| Ed25519SignKeyManager::PublicKeySignFactory::Create( |
| const Ed25519PrivateKey& private_key) const { |
| // BoringSSL expects a 64-byte private key which contains the public key as a |
| // suffix. |
| util::SecretData sk = util::SecretDataFromStringView(absl::StrCat( |
| private_key.key_value(), private_key.public_key().key_value())); |
| |
| return subtle::Ed25519SignBoringSsl::New(sk); |
| } |
| |
| Status Ed25519SignKeyManager::ValidateKey(const Ed25519PrivateKey& key) const { |
| Status status = ValidateVersion(key.version(), get_version()); |
| if (!status.ok()) return status; |
| if (key.key_value().length() != 32) { |
| return Status(absl::StatusCode::kInvalidArgument, |
| "The ED25519 private key must be 32-bytes long."); |
| } |
| return Ed25519VerifyKeyManager().ValidateKey(key.public_key()); |
| } |
| |
| StatusOr<Ed25519PrivateKey> Ed25519SignKeyManager::DeriveKey( |
| const Ed25519KeyFormat& key_format, InputStream* input_stream) const { |
| util::Status status = ValidateVersion(key_format.version(), get_version()); |
| if (!status.ok()) return status; |
| |
| util::StatusOr<util::SecretData> randomness = |
| ReadSecretBytesFromStream(kEd25519SecretSeedSize, input_stream); |
| if (!randomness.ok()) { |
| if (randomness.status().code() == absl::StatusCode::kOutOfRange) { |
| return util::Status( |
| absl::StatusCode::kInvalidArgument, |
| "Could not get enough pseudorandomness from input stream"); |
| } |
| return randomness.status(); |
| } |
| util::StatusOr<std::unique_ptr<internal::Ed25519Key>> key = |
| internal::NewEd25519Key(*randomness); |
| |
| Ed25519PrivateKey ed25519_private_key; |
| ed25519_private_key.set_version(get_version()); |
| ed25519_private_key.set_key_value((*key)->private_key); |
| |
| // Build Ed25519PublicKey. |
| auto ed25519_public_key = ed25519_private_key.mutable_public_key(); |
| ed25519_public_key->set_version(get_version()); |
| ed25519_public_key->set_key_value((*key)->public_key); |
| |
| return ed25519_private_key; |
| } |
| |
| Status Ed25519SignKeyManager::ValidateKeyFormat( |
| const Ed25519KeyFormat& key_format) const { |
| return util::OkStatus(); |
| } |
| |
| } // namespace tink |
| } // namespace crypto |