| 43 | } |
| 44 | |
| 45 | bool RandomBytes::GetRandomBytes(unsigned char *buf, DWORD len) |
| 46 | { |
| 47 | if (len > RANDOM_POOL_SIZE) { |
| 48 | return get_sys_random_bytes(buf, len); |
| 49 | } |
| 50 | |
| 51 | bool bret = true; |
| 52 | |
| 53 | lock(); |
| 54 | |
| 55 | if (m_bufpos + len < RANDOM_POOL_SIZE) { |
| 56 | memcpy(buf, m_randbuf + m_bufpos, len); |
| 57 | m_bufpos += len; |
| 58 | } else { |
| 59 | DWORD bytes_copied = 0; |
| 60 | if (m_bufpos < RANDOM_POOL_SIZE) { |
| 61 | memcpy(buf, m_randbuf + m_bufpos, RANDOM_POOL_SIZE - m_bufpos); |
| 62 | bytes_copied += RANDOM_POOL_SIZE - m_bufpos; |
| 63 | m_bufpos += bytes_copied; |
| 64 | } |
| 65 | if (get_sys_random_bytes(m_randbuf, RANDOM_POOL_SIZE)) { |
| 66 | m_bufpos = 0; |
| 67 | memcpy(buf + bytes_copied, m_randbuf, len - bytes_copied); |
| 68 | m_bufpos += len - bytes_copied; |
| 69 | } else { |
| 70 | bret = false; |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | unlock(); |
| 75 | |
| 76 | return bret; |
| 77 | } |
no test coverage detected