1 // SPDX-License-Identifier: GPL-2.0-or-later
5 * Single-block cipher operations.
7 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
8 * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
11 #include <crypto/algapi.h>
12 #include <crypto/internal/cipher.h>
13 #include <linux/kernel.h>
14 #include <linux/crypto.h>
15 #include <linux/errno.h>
16 #include <linux/slab.h>
17 #include <linux/string.h>
20 static int setkey_unaligned(struct crypto_cipher
*tfm
, const u8
*key
,
23 struct cipher_alg
*cia
= crypto_cipher_alg(tfm
);
24 unsigned long alignmask
= crypto_cipher_alignmask(tfm
);
26 u8
*buffer
, *alignbuffer
;
29 absize
= keylen
+ alignmask
;
30 buffer
= kmalloc(absize
, GFP_ATOMIC
);
34 alignbuffer
= (u8
*)ALIGN((unsigned long)buffer
, alignmask
+ 1);
35 memcpy(alignbuffer
, key
, keylen
);
36 ret
= cia
->cia_setkey(crypto_cipher_tfm(tfm
), alignbuffer
, keylen
);
37 kfree_sensitive(buffer
);
42 int crypto_cipher_setkey(struct crypto_cipher
*tfm
,
43 const u8
*key
, unsigned int keylen
)
45 struct cipher_alg
*cia
= crypto_cipher_alg(tfm
);
46 unsigned long alignmask
= crypto_cipher_alignmask(tfm
);
48 if (keylen
< cia
->cia_min_keysize
|| keylen
> cia
->cia_max_keysize
)
51 if ((unsigned long)key
& alignmask
)
52 return setkey_unaligned(tfm
, key
, keylen
);
54 return cia
->cia_setkey(crypto_cipher_tfm(tfm
), key
, keylen
);
56 EXPORT_SYMBOL_NS_GPL(crypto_cipher_setkey
, "CRYPTO_INTERNAL");
58 static inline void cipher_crypt_one(struct crypto_cipher
*tfm
,
59 u8
*dst
, const u8
*src
, bool enc
)
61 unsigned long alignmask
= crypto_cipher_alignmask(tfm
);
62 struct cipher_alg
*cia
= crypto_cipher_alg(tfm
);
63 void (*fn
)(struct crypto_tfm
*, u8
*, const u8
*) =
64 enc
? cia
->cia_encrypt
: cia
->cia_decrypt
;
66 if (unlikely(((unsigned long)dst
| (unsigned long)src
) & alignmask
)) {
67 unsigned int bs
= crypto_cipher_blocksize(tfm
);
68 u8 buffer
[MAX_CIPHER_BLOCKSIZE
+ MAX_CIPHER_ALIGNMASK
];
69 u8
*tmp
= (u8
*)ALIGN((unsigned long)buffer
, alignmask
+ 1);
72 fn(crypto_cipher_tfm(tfm
), tmp
, tmp
);
75 fn(crypto_cipher_tfm(tfm
), dst
, src
);
79 void crypto_cipher_encrypt_one(struct crypto_cipher
*tfm
,
80 u8
*dst
, const u8
*src
)
82 cipher_crypt_one(tfm
, dst
, src
, true);
84 EXPORT_SYMBOL_NS_GPL(crypto_cipher_encrypt_one
, "CRYPTO_INTERNAL");
86 void crypto_cipher_decrypt_one(struct crypto_cipher
*tfm
,
87 u8
*dst
, const u8
*src
)
89 cipher_crypt_one(tfm
, dst
, src
, false);
91 EXPORT_SYMBOL_NS_GPL(crypto_cipher_decrypt_one
, "CRYPTO_INTERNAL");
93 struct crypto_cipher
*crypto_clone_cipher(struct crypto_cipher
*cipher
)
95 struct crypto_tfm
*tfm
= crypto_cipher_tfm(cipher
);
96 struct crypto_alg
*alg
= tfm
->__crt_alg
;
97 struct crypto_cipher
*ncipher
;
98 struct crypto_tfm
*ntfm
;
101 return ERR_PTR(-ENOSYS
);
103 if (unlikely(!crypto_mod_get(alg
)))
104 return ERR_PTR(-ESTALE
);
106 ntfm
= __crypto_alloc_tfmgfp(alg
, CRYPTO_ALG_TYPE_CIPHER
,
107 CRYPTO_ALG_TYPE_MASK
, GFP_ATOMIC
);
110 return ERR_CAST(ntfm
);
113 ntfm
->crt_flags
= tfm
->crt_flags
;
115 ncipher
= __crypto_cipher_cast(ntfm
);
119 EXPORT_SYMBOL_GPL(crypto_clone_cipher
);