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/* SPDX-License-Identifier: GPL-2.0 */
/*
* DES & Triple DES EDE Cipher Algorithms.
*/
#ifndef __CRYPTO_DES_H
#define __CRYPTO_DES_H
#include <crypto/skcipher.h>
#include <linux/compiler.h>
#include <linux/fips.h>
#include <linux/string.h>
#define DES_KEY_SIZE 8
#define DES_EXPKEY_WORDS 32
#define DES_BLOCK_SIZE 8
#define DES3_EDE_KEY_SIZE (3 * DES_KEY_SIZE)
#define DES3_EDE_EXPKEY_WORDS (3 * DES_EXPKEY_WORDS)
#define DES3_EDE_BLOCK_SIZE DES_BLOCK_SIZE
static inline int __des3_verify_key(u32 *flags, const u8 *key)
{
int err = -EINVAL;
u32 K[6];
memcpy(K, key, DES3_EDE_KEY_SIZE);
if (unlikely(!((K[0] ^ K[2]) | (K[1] ^ K[3])) ||
!((K[2] ^ K[4]) | (K[3] ^ K[5]))) &&
(fips_enabled ||
(*flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)))
goto bad;
if (unlikely(!((K[0] ^ K[4]) | (K[1] ^ K[5]))) && fips_enabled)
goto bad;
err = 0;
out:
memzero_explicit(K, DES3_EDE_KEY_SIZE);
return err;
bad:
*flags |= CRYPTO_TFM_RES_WEAK_KEY;
goto out;
}
static inline int des3_verify_key(struct crypto_skcipher *tfm, const u8 *key)
{
u32 flags;
int err;
flags = crypto_skcipher_get_flags(tfm);
err = __des3_verify_key(&flags, key);
crypto_skcipher_set_flags(tfm, flags);
return err;
}
extern unsigned long des_ekey(u32 *pe, const u8 *k);
extern int __des3_ede_setkey(u32 *expkey, u32 *flags, const u8 *key,
unsigned int keylen);
#endif /* __CRYPTO_DES_H */
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