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 // 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 ANONYMOUS_TOKENS_CPP_CRYPTO_BLINDER_H_ 16 #define ANONYMOUS_TOKENS_CPP_CRYPTO_BLINDER_H_ 17 18 #include <string> 19 20 #include "absl/status/statusor.h" 21 22 23 namespace anonymous_tokens { 24 25 class Blinder { 26 public: 27 enum class BlinderState { kCreated = 0, kBlinded, kUnblinded }; 28 virtual absl::StatusOr<std::string> Blind(absl::string_view message) = 0; 29 30 virtual absl::StatusOr<std::string> Unblind( 31 absl::string_view blind_signature) = 0; 32 33 virtual ~Blinder() = default; 34 }; 35 36 } // namespace anonymous_tokens 37 38 #endif // ANONYMOUS_TOKENS_CPP_CRYPTO_BLINDER_H_ 39