| // Copyright 2021 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "cryptohome/util/get_random_suffix.h" |
| |
| #include <string> |
| |
| #include <openssl/rand.h> |
| |
| namespace cryptohome { |
| |
| std::string GetRandomSuffix() { |
| const int kBufferSize = 6; |
| unsigned char buffer[kBufferSize]; |
| if (RAND_bytes(buffer, kBufferSize) < 0) { |
| return ""; |
| } |
| std::string suffix; |
| for (int i = 0; i < kBufferSize; ++i) { |
| int random_value = buffer[i] % (2 * 26 + 10); |
| if (random_value < 26) { |
| suffix.push_back('a' + random_value); |
| } else if (random_value < 2 * 26) { |
| suffix.push_back('A' + random_value - 26); |
| } else { |
| suffix.push_back('0' + random_value - 2 * 26); |
| } |
| } |
| return suffix; |
| } |
| |
| } // namespace cryptohome |
