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 memset(alignbuffer
, 0, keylen
);
43 int crypto_cipher_setkey(struct crypto_cipher
*tfm
,
44 const u8
*key
, unsigned int keylen
)
46 struct cipher_alg
*cia
= crypto_cipher_alg(tfm
);
47 unsigned long alignmask
= crypto_cipher_alignmask(tfm
);
49 if (keylen
< cia
->cia_min_keysize
|| keylen
> cia
->cia_max_keysize
)
52 if ((unsigned long)key
& alignmask
)
53 return setkey_unaligned(tfm
, key
, keylen
);
55 return cia
->cia_setkey(crypto_cipher_tfm(tfm
), key
, keylen
);
57 EXPORT_SYMBOL_NS_GPL(crypto_cipher_setkey
, CRYPTO_INTERNAL
);
59 static inline void cipher_crypt_one(struct crypto_cipher
*tfm
,
60 u8
*dst
, const u8
*src
, bool enc
)
62 unsigned long alignmask
= crypto_cipher_alignmask(tfm
);
63 struct cipher_alg
*cia
= crypto_cipher_alg(tfm
);
64 void (*fn
)(struct crypto_tfm
*, u8
*, const u8
*) =
65 enc
? cia
->cia_encrypt
: cia
->cia_decrypt
;
67 if (unlikely(((unsigned long)dst
| (unsigned long)src
) & alignmask
)) {
68 unsigned int bs
= crypto_cipher_blocksize(tfm
);
69 u8 buffer
[MAX_CIPHER_BLOCKSIZE
+ MAX_CIPHER_ALIGNMASK
];
70 u8
*tmp
= (u8
*)ALIGN((unsigned long)buffer
, alignmask
+ 1);
73 fn(crypto_cipher_tfm(tfm
), tmp
, tmp
);
76 fn(crypto_cipher_tfm(tfm
), dst
, src
);
80 void crypto_cipher_encrypt_one(struct crypto_cipher
*tfm
,
81 u8
*dst
, const u8
*src
)
83 cipher_crypt_one(tfm
, dst
, src
, true);
85 EXPORT_SYMBOL_NS_GPL(crypto_cipher_encrypt_one
, CRYPTO_INTERNAL
);
87 void crypto_cipher_decrypt_one(struct crypto_cipher
*tfm
,
88 u8
*dst
, const u8
*src
)
90 cipher_crypt_one(tfm
, dst
, src
, false);
92 EXPORT_SYMBOL_NS_GPL(crypto_cipher_decrypt_one
, CRYPTO_INTERNAL
);