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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Cryptographic API. | |
4 | * | |
5 | * Cipher operations. | |
6 | * | |
7 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> | |
c774e93e | 8 | * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au> |
1da177e4 | 9 | */ |
f1ddcaf3 | 10 | |
6650c4de | 11 | #include <crypto/algapi.h> |
1da177e4 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/crypto.h> | |
14 | #include <linux/errno.h> | |
791b4d5f | 15 | #include <linux/slab.h> |
1da177e4 | 16 | #include <linux/string.h> |
1da177e4 | 17 | #include "internal.h" |
1da177e4 | 18 | |
791b4d5f HX |
19 | static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key, |
20 | unsigned int keylen) | |
ca7c3938 SS |
21 | { |
22 | struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher; | |
23 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); | |
24 | int ret; | |
25 | u8 *buffer, *alignbuffer; | |
26 | unsigned long absize; | |
27 | ||
28 | absize = keylen + alignmask; | |
29 | buffer = kmalloc(absize, GFP_ATOMIC); | |
30 | if (!buffer) | |
31 | return -ENOMEM; | |
32 | ||
33 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
34 | memcpy(alignbuffer, key, keylen); | |
35 | ret = cia->cia_setkey(tfm, alignbuffer, keylen); | |
06817176 | 36 | memset(alignbuffer, 0, keylen); |
ca7c3938 SS |
37 | kfree(buffer); |
38 | return ret; | |
39 | ||
40 | } | |
41 | ||
1da177e4 LT |
42 | static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) |
43 | { | |
44 | struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher; | |
ca7c3938 SS |
45 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); |
46 | ||
560c06ae | 47 | tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK; |
1da177e4 LT |
48 | if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize) { |
49 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
50 | return -EINVAL; | |
ca7c3938 SS |
51 | } |
52 | ||
53 | if ((unsigned long)key & alignmask) | |
54 | return setkey_unaligned(tfm, key, keylen); | |
55 | ||
56 | return cia->cia_setkey(tfm, key, keylen); | |
1da177e4 LT |
57 | } |
58 | ||
f28776a3 HX |
59 | static void cipher_crypt_unaligned(void (*fn)(struct crypto_tfm *, u8 *, |
60 | const u8 *), | |
61 | struct crypto_tfm *tfm, | |
62 | u8 *dst, const u8 *src) | |
63 | { | |
64 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); | |
65 | unsigned int size = crypto_tfm_alg_blocksize(tfm); | |
6650c4de | 66 | u8 buffer[MAX_CIPHER_BLOCKSIZE + MAX_CIPHER_ALIGNMASK]; |
f28776a3 HX |
67 | u8 *tmp = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); |
68 | ||
69 | memcpy(tmp, src, size); | |
70 | fn(tfm, tmp, tmp); | |
71 | memcpy(dst, tmp, size); | |
72 | } | |
73 | ||
74 | static void cipher_encrypt_unaligned(struct crypto_tfm *tfm, | |
75 | u8 *dst, const u8 *src) | |
76 | { | |
77 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); | |
78 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; | |
79 | ||
80 | if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) { | |
81 | cipher_crypt_unaligned(cipher->cia_encrypt, tfm, dst, src); | |
82 | return; | |
83 | } | |
84 | ||
85 | cipher->cia_encrypt(tfm, dst, src); | |
86 | } | |
87 | ||
88 | static void cipher_decrypt_unaligned(struct crypto_tfm *tfm, | |
89 | u8 *dst, const u8 *src) | |
90 | { | |
91 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); | |
92 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; | |
93 | ||
94 | if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) { | |
95 | cipher_crypt_unaligned(cipher->cia_decrypt, tfm, dst, src); | |
96 | return; | |
97 | } | |
98 | ||
99 | cipher->cia_decrypt(tfm, dst, src); | |
100 | } | |
101 | ||
1da177e4 LT |
102 | int crypto_init_cipher_ops(struct crypto_tfm *tfm) |
103 | { | |
1da177e4 | 104 | struct cipher_tfm *ops = &tfm->crt_cipher; |
f28776a3 | 105 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; |
1da177e4 LT |
106 | |
107 | ops->cit_setkey = setkey; | |
f28776a3 HX |
108 | ops->cit_encrypt_one = crypto_tfm_alg_alignmask(tfm) ? |
109 | cipher_encrypt_unaligned : cipher->cia_encrypt; | |
110 | ops->cit_decrypt_one = crypto_tfm_alg_alignmask(tfm) ? | |
111 | cipher_decrypt_unaligned : cipher->cia_decrypt; | |
1da177e4 | 112 | |
f1ddcaf3 | 113 | return 0; |
1da177e4 | 114 | } |