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Diffstat (limited to 'cc/hybrid/hybrid_private_key.h')
-rw-r--r-- | cc/hybrid/hybrid_private_key.h | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/cc/hybrid/hybrid_private_key.h b/cc/hybrid/hybrid_private_key.h new file mode 100644 index 000000000..caade1157 --- /dev/null +++ b/cc/hybrid/hybrid_private_key.h @@ -0,0 +1,61 @@ +// Copyright 2023 Google LLC +// +// 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. +// +//////////////////////////////////////////////////////////////////////////////// + +#ifndef TINK_HYBRID_HYBRID_PRIVATE_KEY_H_ +#define TINK_HYBRID_HYBRID_PRIVATE_KEY_H_ + +#include "absl/strings/string_view.h" +#include "tink/hybrid/hybrid_parameters.h" +#include "tink/hybrid/hybrid_public_key.h" +#include "tink/key.h" +#include "tink/private_key.h" + +namespace crypto { +namespace tink { + +// Represents the decryption function for a hybrid encryption primitive. +class HybridPrivateKey : public PrivateKey { + public: + const HybridPublicKey& GetPublicKey() const override = 0; + + // Returns the bytes prefixed to every ciphertext generated by the + // corresponding public key. + // + // In order to make key rotation more efficient, Tink allows every hybrid + // private key to have an associated ciphertext output prefix. When decrypting + // a ciphertext, only keys with a matching prefix have to be tried. + // + // See https://developers.google.com/tink/wire-format#tink_output_prefix for + // more background information on Tink output prefixes. + absl::string_view GetOutputPrefix() const { + return GetPublicKey().GetOutputPrefix(); + } + + absl::optional<int> GetIdRequirement() const override { + return GetPublicKey().GetIdRequirement(); + } + + const HybridParameters& GetParameters() const override { + return GetPublicKey().GetParameters(); + } + + bool operator==(const Key& other) const override = 0; +}; + +} // namespace tink +} // namespace crypto + +#endif // TINK_HYBRID_HYBRID_PRIVATE_KEY_H_ |