| /* SPDX-License-Identifier: BSD-2-Clause */ |
| /* |
| * Copyright (c) 2014-2019, Linaro Limited |
| */ |
| |
| static inline void get_des2_key(const uint8_t **key, size_t *key_len, |
| uint8_t *tmp) |
| { |
| if (*key_len == 16) { |
| /* |
| * This corresponds to a 2DES key. The 2DES encryption |
| * algorithm is similar to 3DES. Both perform and |
| * encryption step, then a decryption step, followed |
| * by another encryption step (EDE). However 2DES uses |
| * the same key for both of the encryption (E) steps. |
| */ |
| memcpy(tmp, *key, 16); |
| memcpy(tmp + 16, *key, 8); |
| *key = tmp; |
| *key_len = 24; |
| } |
| } |
