1 /* 2 * Copyright 2020 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 * http://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 #include "fcp/secagg/server/ssl_bit_gen.h" 18 19 #include <type_traits> 20 21 // Thread-safety guarantees only apply in BoringSSL. 22 #include "fcp/base/monitoring.h" 23 #include "openssl/is_boringssl.h" 24 #include "openssl/rand.h" 25 26 namespace fcp { 27 namespace secagg { 28 operator ()()29SslBitGen::result_type SslBitGen::operator()() { 30 static_assert(std::is_same<uint8_t, unsigned char>::value, 31 "uint8_t being other than unsigned char isn't supported by " 32 "BoringSSL"); 33 SslBitGen::result_type random_integer; 34 int success = RAND_bytes(reinterpret_cast<unsigned char*>(&random_integer), 35 sizeof(random_integer)); 36 // RAND_bytes always returns 1 in BoringSSL 37 FCP_CHECK(success == 1); 38 39 return random_integer; 40 } 41 42 } // namespace secagg 43 } // namespace fcp 44