LXR linux/include/crypto/des.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/* 
   3 * DES & Triple DES EDE Cipher Algorithms.
   4 */
   5
   6#ifndef __CRYPTO_DES_H
   7#define __CRYPTO_DES_H
   8
   9#include <crypto/skcipher.h>
  10#include <linux/compiler.h>
  11#include <linux/fips.h>
  12#include <linux/string.h>
  13
  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
  22static 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
  40out:
  41        memzero_explicit(K, DES3_EDE_KEY_SIZE);
  42
  43        return err;
  44
  45bad:
  46        *flags |= CRYPTO_TFM_RES_WEAK_KEY;
  47        goto out;
  48}
  49
  50static 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}
  60
  61extern unsigned long des_ekey(u32 *pe, const u8 *k);
  62
  63extern int __des3_ede_setkey(u32 *expkey, u32 *flags, const u8 *key,
  64                             unsigned int keylen);
  65
  66#endif /* __CRYPTO_DES_H */
  67