1 /* 2 * Copyright 2018 Google LLC 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * https://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef FCP_SECAGG_SHARED_CRYPTO_RAND_PRNG_H_ 18 #define FCP_SECAGG_SHARED_CRYPTO_RAND_PRNG_H_ 19 20 #include <cstdint> 21 22 #include "fcp/secagg/shared/prng.h" 23 24 namespace fcp { 25 namespace secagg { 26 27 // A cryptographically strong Pseudorandom Number Generator based on OpenSSL, 28 // which seeds using /dev/urandom on UNIX-like operating systems, and other 29 // sources of randomness on Windows. 30 // 31 // This class is thread-safe. 32 33 class CryptoRandPrng : public SecurePrng { 34 public: 35 CryptoRandPrng() = default; 36 37 uint8_t Rand8() override; 38 uint64_t Rand64() override; 39 }; 40 41 } // namespace secagg 42 } // namespace fcp 43 #endif // FCP_SECAGG_SHARED_CRYPTO_RAND_PRNG_H_ 44