| // 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_BIG_INTEGER_H_ |
| #define TINK_BIG_INTEGER_H_ |
| |
| #include <cstdint> |
| #include <string> |
| |
| #include "absl/strings/string_view.h" |
| |
| namespace crypto { |
| namespace tink { |
| |
| // Stores a BigInteger value as a big endian encoded string. Removes leading |
| // zeros prior to creation. This class is particularly useful for working with |
| // certain primitives which use big integers types for the parameters and key |
| // material. |
| class BigInteger { |
| public: |
| // Copyable and movable. |
| BigInteger(const BigInteger& other) = default; |
| BigInteger& operator=(const BigInteger& other) = default; |
| BigInteger(BigInteger&& other) = default; |
| BigInteger& operator=(BigInteger&& other) = default; |
| |
| // Creates a new BigInteger object that wraps a big endian encoded |
| // string and removes leading zeros. |
| explicit BigInteger(absl::string_view big_integer); |
| |
| // Returns the value of this BigInteger object. |
| absl::string_view GetValue() const { return value_; } |
| |
| int64_t SizeInBytes() const { return value_.size(); } |
| |
| // Constant-time comparison operators. |
| bool operator==(const BigInteger& other) const; |
| bool operator!=(const BigInteger& other) const { return !(*this == other); } |
| |
| private: |
| std::string value_; |
| }; |
| |
| } // namespace tink |
| } // namespace crypto |
| |
| #endif // TINK_BIG_INTEGER_H_ |