Create padding for a block of given size. plain_size = size + len(padding) + signature_size() plain_size = N * plain_block_size()
(self, size)
| 127 | return 1 |
| 128 | |
| 129 | def padding(self, size): |
| 130 | """ |
| 131 | Create padding for a block of given size. |
| 132 | plain_size = size + len(padding) + signature_size() |
| 133 | plain_size = N * plain_block_size() |
| 134 | """ |
| 135 | if not self.is_encrypted: |
| 136 | return b'' |
| 137 | block_size = self.Encryptor.plain_block_size() |
| 138 | extrapad_size = 2 if self.Encryptor.encrypted_block_size() > 256 else 1 |
| 139 | rem = (size + self.signature_size() + extrapad_size) % block_size |
| 140 | if rem != 0: |
| 141 | rem = block_size - rem |
| 142 | data = bytes(bytearray([rem%256])) * (rem + 1) |
| 143 | if self.Encryptor.encrypted_block_size() > 256: |
| 144 | data = data + bytes(bytearray([rem>>8])) |
| 145 | return data |
| 146 | |
| 147 | def min_padding_size(self): |
| 148 | if self.is_encrypted: |
no test coverage detected