Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
Evgeniy Polyakov | 16d004a | 2007-10-11 19:48:58 +0800 | [diff] [blame] | 2 | /* |
| 3 | * DES & Triple DES EDE Cipher Algorithms. |
| 4 | */ |
| 5 | |
| 6 | #ifndef __CRYPTO_DES_H |
| 7 | #define __CRYPTO_DES_H |
| 8 | |
Herbert Xu | d7198ce | 2019-04-11 16:50:56 +0800 | [diff] [blame] | 9 | #include <crypto/skcipher.h> |
| 10 | #include <linux/compiler.h> |
| 11 | #include <linux/fips.h> |
| 12 | #include <linux/string.h> |
| 13 | |
Evgeniy Polyakov | 16d004a | 2007-10-11 19:48:58 +0800 | [diff] [blame] | 14 | #define DES_KEY_SIZE 8 |
| 15 | #define DES_EXPKEY_WORDS 32 |
| 16 | #define DES_BLOCK_SIZE 8 |
| 17 | |
| 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 |
| 21 | |
Herbert Xu | d7198ce | 2019-04-11 16:50:56 +0800 | [diff] [blame] | 22 | static inline int __des3_verify_key(u32 *flags, const u8 *key) |
| 23 | { |
| 24 | int err = -EINVAL; |
| 25 | u32 K[6]; |
| 26 | |
| 27 | memcpy(K, key, DES3_EDE_KEY_SIZE); |
| 28 | |
| 29 | if (unlikely(!((K[0] ^ K[2]) | (K[1] ^ K[3])) || |
| 30 | !((K[2] ^ K[4]) | (K[3] ^ K[5]))) && |
| 31 | (fips_enabled || |
| 32 | (*flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS))) |
| 33 | goto bad; |
| 34 | |
| 35 | if (unlikely(!((K[0] ^ K[4]) | (K[1] ^ K[5]))) && fips_enabled) |
| 36 | goto bad; |
| 37 | |
| 38 | err = 0; |
| 39 | |
| 40 | out: |
| 41 | memzero_explicit(K, DES3_EDE_KEY_SIZE); |
| 42 | |
| 43 | return err; |
| 44 | |
| 45 | bad: |
| 46 | *flags |= CRYPTO_TFM_RES_WEAK_KEY; |
| 47 | goto out; |
| 48 | } |
| 49 | |
| 50 | static inline int des3_verify_key(struct crypto_skcipher *tfm, const u8 *key) |
| 51 | { |
| 52 | u32 flags; |
| 53 | int err; |
| 54 | |
| 55 | flags = crypto_skcipher_get_flags(tfm); |
| 56 | err = __des3_verify_key(&flags, key); |
| 57 | crypto_skcipher_set_flags(tfm, flags); |
| 58 | return err; |
| 59 | } |
Evgeniy Polyakov | 16d004a | 2007-10-11 19:48:58 +0800 | [diff] [blame] | 60 | |
| 61 | extern unsigned long des_ekey(u32 *pe, const u8 *k); |
| 62 | |
Jussi Kivilinna | 6574e6c | 2014-06-09 20:59:54 +0300 | [diff] [blame] | 63 | extern int __des3_ede_setkey(u32 *expkey, u32 *flags, const u8 *key, |
| 64 | unsigned int keylen); |
| 65 | |
Evgeniy Polyakov | 16d004a | 2007-10-11 19:48:58 +0800 | [diff] [blame] | 66 | #endif /* __CRYPTO_DES_H */ |