| 5 | #include <vector> |
| 6 | |
| 7 | double calculateEntropy(const std::vector<Byte>& data) { |
| 8 | std::vector<double> freq(256, 0.0); |
| 9 | for (Byte b : data) { |
| 10 | freq[b]++; |
| 11 | } |
| 12 | double entropy = 0.0; |
| 13 | for (double count : freq) { |
| 14 | if (count > 0) { |
| 15 | double p = count / static_cast<double>(data.size()); |
| 16 | entropy -= p * log2(p); |
| 17 | } |
| 18 | } |
| 19 | return entropy; |
| 20 | } |
| 21 | |
| 22 | bool IsFileEncrypted(const std::vector<Byte>& data) { |
| 23 | double entropy = calculateEntropy(data); |