1 // Copyright 2023 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 // http://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 //////////////////////////////////////////////////////////////////////////////// 16 17 #ifndef TINK_SIGNATURE_ED25519_PUBLIC_KEY_H_ 18 #define TINK_SIGNATURE_ED25519_PUBLIC_KEY_H_ 19 20 #include <string> 21 22 #include "absl/types/optional.h" 23 #include "tink/partial_key_access_token.h" 24 #include "tink/signature/ed25519_parameters.h" 25 #include "tink/signature/signature_public_key.h" 26 #include "tink/util/statusor.h" 27 28 namespace crypto { 29 namespace tink { 30 31 class Ed25519PublicKey : public SignaturePublicKey { 32 public: 33 // Copyable and movable. 34 Ed25519PublicKey(const Ed25519PublicKey& other) = default; 35 Ed25519PublicKey& operator=(const Ed25519PublicKey& other) = default; 36 Ed25519PublicKey(Ed25519PublicKey&& other) = default; 37 Ed25519PublicKey& operator=(Ed25519PublicKey&& other) = default; 38 39 // Creates a new Ed25519 public key from `public_key_bytes`. If `parameters` 40 // specify a variant that uses a prefix, then `id_requirement` is used to 41 // compute this prefix. 42 static util::StatusOr<Ed25519PublicKey> Create( 43 const Ed25519Parameters& parameters, absl::string_view public_key_bytes, 44 absl::optional<int> id_requirement, PartialKeyAccessToken token); 45 GetPublicKeyBytes(PartialKeyAccessToken token)46 absl::string_view GetPublicKeyBytes(PartialKeyAccessToken token) const { 47 return public_key_bytes_; 48 } 49 GetOutputPrefix()50 absl::string_view GetOutputPrefix() const override { return output_prefix_; } 51 GetParameters()52 const Ed25519Parameters& GetParameters() const override { 53 return parameters_; 54 } 55 GetIdRequirement()56 absl::optional<int> GetIdRequirement() const override { 57 return id_requirement_; 58 } 59 60 bool operator==(const Key& other) const override; 61 62 private: Ed25519PublicKey(const Ed25519Parameters & parameters,absl::string_view public_key_bytes,absl::optional<int> id_requirement,absl::string_view output_prefix)63 explicit Ed25519PublicKey(const Ed25519Parameters& parameters, 64 absl::string_view public_key_bytes, 65 absl::optional<int> id_requirement, 66 absl::string_view output_prefix) 67 : parameters_(parameters), 68 public_key_bytes_(public_key_bytes), 69 id_requirement_(id_requirement), 70 output_prefix_(output_prefix) {} 71 72 Ed25519Parameters parameters_; 73 std::string public_key_bytes_; 74 absl::optional<int> id_requirement_; 75 std::string output_prefix_; 76 }; 77 78 } // namespace tink 79 } // namespace crypto 80 81 #endif // TINK_SIGNATURE_ED25519_PUBLIC_KEY_H_ 82