1 /* SPDX-License-Identifier: GPL-2.0 */
3 * DES & Triple DES EDE Cipher Algorithms.
9 #include <crypto/skcipher.h>
10 #include <linux/compiler.h>
11 #include <linux/fips.h>
12 #include <linux/string.h>
14 #define DES_KEY_SIZE 8
15 #define DES_EXPKEY_WORDS 32
16 #define DES_BLOCK_SIZE 8
18 #define DES3_EDE_KEY_SIZE (3 * DES_KEY_SIZE)
19 #define DES3_EDE_EXPKEY_WORDS (3 * DES_EXPKEY_WORDS)
20 #define DES3_EDE_BLOCK_SIZE DES_BLOCK_SIZE
22 static inline int __des3_verify_key(u32 *flags, const u8 *key)
27 memcpy(K, key, DES3_EDE_KEY_SIZE);
29 if (unlikely(!((K[0] ^ K[2]) | (K[1] ^ K[3])) ||
30 !((K[2] ^ K[4]) | (K[3] ^ K[5]))) &&
32 (*flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)))
35 if (unlikely(!((K[0] ^ K[4]) | (K[1] ^ K[5]))) && fips_enabled)
41 memzero_explicit(K, DES3_EDE_KEY_SIZE);
46 *flags |= CRYPTO_TFM_RES_WEAK_KEY;
50 static inline int des3_verify_key(struct crypto_skcipher *tfm, const u8 *key)
55 flags = crypto_skcipher_get_flags(tfm);
56 err = __des3_verify_key(&flags, key);
57 crypto_skcipher_set_flags(tfm, flags);
61 extern unsigned long des_ekey(u32 *pe, const u8 *k);
63 extern int __des3_ede_setkey(u32 *expkey, u32 *flags, const u8 *key,
66 #endif /* __CRYPTO_DES_H */