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 namespace anonymous_tokens { 23 24 class Blinder { 25 public: 26 enum class BlinderState { kCreated = 0, kBlinded, kUnblinded }; 27 virtual absl::StatusOr<std::string> Blind(absl::string_view message) = 0; 28 29 virtual absl::StatusOr<std::string> Unblind( 30 absl::string_view blind_signature) = 0; 31 32 virtual ~Blinder() = default; 33 }; 34 35 } // namespace anonymous_tokens 36 #endif // ANONYMOUS_TOKENS_CPP_CRYPTO_BLINDER_H_ 37