1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 216d004a2SEvgeniy Polyakov /* 316d004a2SEvgeniy Polyakov * DES & Triple DES EDE Cipher Algorithms. 416d004a2SEvgeniy Polyakov */ 516d004a2SEvgeniy Polyakov 616d004a2SEvgeniy Polyakov #ifndef __CRYPTO_DES_H 716d004a2SEvgeniy Polyakov #define __CRYPTO_DES_H 816d004a2SEvgeniy Polyakov 9d7198ce4SHerbert Xu #include <crypto/skcipher.h> 10d7198ce4SHerbert Xu #include <linux/compiler.h> 11d7198ce4SHerbert Xu #include <linux/fips.h> 12d7198ce4SHerbert Xu #include <linux/string.h> 13d7198ce4SHerbert Xu 1416d004a2SEvgeniy Polyakov #define DES_KEY_SIZE 8 1516d004a2SEvgeniy Polyakov #define DES_EXPKEY_WORDS 32 1616d004a2SEvgeniy Polyakov #define DES_BLOCK_SIZE 8 1716d004a2SEvgeniy Polyakov 1816d004a2SEvgeniy Polyakov #define DES3_EDE_KEY_SIZE (3 * DES_KEY_SIZE) 1916d004a2SEvgeniy Polyakov #define DES3_EDE_EXPKEY_WORDS (3 * DES_EXPKEY_WORDS) 2016d004a2SEvgeniy Polyakov #define DES3_EDE_BLOCK_SIZE DES_BLOCK_SIZE 2116d004a2SEvgeniy Polyakov 22d7198ce4SHerbert Xu static inline int __des3_verify_key(u32 *flags, const u8 *key) 23d7198ce4SHerbert Xu { 24d7198ce4SHerbert Xu int err = -EINVAL; 25d7198ce4SHerbert Xu u32 K[6]; 26d7198ce4SHerbert Xu 27d7198ce4SHerbert Xu memcpy(K, key, DES3_EDE_KEY_SIZE); 28d7198ce4SHerbert Xu 29d7198ce4SHerbert Xu if (unlikely(!((K[0] ^ K[2]) | (K[1] ^ K[3])) || 30d7198ce4SHerbert Xu !((K[2] ^ K[4]) | (K[3] ^ K[5]))) && 31d7198ce4SHerbert Xu (fips_enabled || 32d7198ce4SHerbert Xu (*flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS))) 33d7198ce4SHerbert Xu goto bad; 34d7198ce4SHerbert Xu 35d7198ce4SHerbert Xu if (unlikely(!((K[0] ^ K[4]) | (K[1] ^ K[5]))) && fips_enabled) 36d7198ce4SHerbert Xu goto bad; 37d7198ce4SHerbert Xu 38d7198ce4SHerbert Xu err = 0; 39d7198ce4SHerbert Xu 40d7198ce4SHerbert Xu out: 41d7198ce4SHerbert Xu memzero_explicit(K, DES3_EDE_KEY_SIZE); 42d7198ce4SHerbert Xu 43d7198ce4SHerbert Xu return err; 44d7198ce4SHerbert Xu 45d7198ce4SHerbert Xu bad: 46d7198ce4SHerbert Xu *flags |= CRYPTO_TFM_RES_WEAK_KEY; 47d7198ce4SHerbert Xu goto out; 48d7198ce4SHerbert Xu } 49d7198ce4SHerbert Xu 50d7198ce4SHerbert Xu static inline int des3_verify_key(struct crypto_skcipher *tfm, const u8 *key) 51d7198ce4SHerbert Xu { 52d7198ce4SHerbert Xu u32 flags; 53d7198ce4SHerbert Xu int err; 54d7198ce4SHerbert Xu 55d7198ce4SHerbert Xu flags = crypto_skcipher_get_flags(tfm); 56d7198ce4SHerbert Xu err = __des3_verify_key(&flags, key); 57d7198ce4SHerbert Xu crypto_skcipher_set_flags(tfm, flags); 58d7198ce4SHerbert Xu return err; 59d7198ce4SHerbert Xu } 6016d004a2SEvgeniy Polyakov 6116d004a2SEvgeniy Polyakov extern unsigned long des_ekey(u32 *pe, const u8 *k); 6216d004a2SEvgeniy Polyakov 636574e6c6SJussi Kivilinna extern int __des3_ede_setkey(u32 *expkey, u32 *flags, const u8 *key, 646574e6c6SJussi Kivilinna unsigned int keylen); 656574e6c6SJussi Kivilinna 6616d004a2SEvgeniy Polyakov #endif /* __CRYPTO_DES_H */ 67