| // Copyright 2017 Google Inc. |
| // |
| // 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. |
| // |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #include "tink/subtle/random.h" |
| |
| #include <cstring> |
| #include <string> |
| |
| #include "openssl/rand.h" |
| |
| namespace crypto { |
| namespace tink { |
| namespace subtle { |
| |
| // static |
| std::string Random::GetRandomBytes(size_t length) { |
| std::unique_ptr<uint8_t[]> buf(new uint8_t[length]); |
| // BoringSSL documentation says that it always returns 1; while |
| // OpenSSL documentation says that it returns 1 on success, 0 otherwise. We |
| // use BoringSSL, so we don't check the return value. |
| RAND_bytes(buf.get(), length); |
| return std::string(reinterpret_cast<const char *>(buf.get()), length); |
| } |
| |
| uint32_t Random::GetRandomUInt32() { |
| uint8_t buf[sizeof(uint32_t)]; |
| RAND_bytes(buf, sizeof(uint32_t)); |
| uint32_t result; |
| std::memcpy(&result, buf, sizeof(uint32_t)); |
| return result; |
| } |
| |
| uint16_t Random::GetRandomUInt16() { |
| uint8_t buf[sizeof(uint16_t)]; |
| RAND_bytes(buf, sizeof(uint16_t)); |
| uint16_t result; |
| std::memcpy(&result, buf, sizeof(uint16_t)); |
| return result; |
| } |
| |
| uint8_t Random::GetRandomUInt8() { |
| uint8_t result; |
| RAND_bytes(&result, 1); |
| return result; |
| } |
| |
| util::SecretData Random::GetRandomKeyBytes(size_t length) { |
| util::SecretData buf(length, 0); |
| // BoringSSL documentation says that it always returns 1; while |
| // OpenSSL documentation says that it returns 1 on success, 0 otherwise. We |
| // use BoringSSL, so we don't check the return value. |
| RAND_bytes(buf.data(), buf.size()); |
| return buf; |
| } |
| |
| } // namespace subtle |
| } // namespace tink |
| } // namespace crypto |