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1da177e4 LT |
1 | /* |
2 | * Cryptographic API. | |
3 | * | |
4 | * Cipher operations. | |
5 | * | |
6 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> | |
c774e93e | 7 | * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au> |
1da177e4 LT |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the Free | |
11 | * Software Foundation; either version 2 of the License, or (at your option) | |
12 | * any later version. | |
13 | * | |
14 | */ | |
f1ddcaf3 | 15 | |
1da177e4 LT |
16 | #include <linux/kernel.h> |
17 | #include <linux/crypto.h> | |
18 | #include <linux/errno.h> | |
f1ddcaf3 | 19 | #include <linux/scatterlist.h> |
1da177e4 | 20 | #include <linux/string.h> |
1da177e4 | 21 | #include "internal.h" |
1da177e4 | 22 | |
ca7c3938 SS |
23 | static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) |
24 | { | |
25 | struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher; | |
26 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); | |
27 | int ret; | |
28 | u8 *buffer, *alignbuffer; | |
29 | unsigned long absize; | |
30 | ||
31 | absize = keylen + alignmask; | |
32 | buffer = kmalloc(absize, GFP_ATOMIC); | |
33 | if (!buffer) | |
34 | return -ENOMEM; | |
35 | ||
36 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
37 | memcpy(alignbuffer, key, keylen); | |
38 | ret = cia->cia_setkey(tfm, alignbuffer, keylen); | |
39 | memset(alignbuffer, 0, absize); | |
40 | kfree(buffer); | |
41 | return ret; | |
42 | ||
43 | } | |
44 | ||
1da177e4 LT |
45 | static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) |
46 | { | |
47 | struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher; | |
ca7c3938 SS |
48 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); |
49 | ||
560c06ae | 50 | tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK; |
1da177e4 LT |
51 | if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize) { |
52 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
53 | return -EINVAL; | |
ca7c3938 SS |
54 | } |
55 | ||
56 | if ((unsigned long)key & alignmask) | |
57 | return setkey_unaligned(tfm, key, keylen); | |
58 | ||
59 | return cia->cia_setkey(tfm, key, keylen); | |
1da177e4 LT |
60 | } |
61 | ||
f28776a3 HX |
62 | static void cipher_crypt_unaligned(void (*fn)(struct crypto_tfm *, u8 *, |
63 | const u8 *), | |
64 | struct crypto_tfm *tfm, | |
65 | u8 *dst, const u8 *src) | |
66 | { | |
67 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); | |
68 | unsigned int size = crypto_tfm_alg_blocksize(tfm); | |
69 | u8 buffer[size + alignmask]; | |
70 | u8 *tmp = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
71 | ||
72 | memcpy(tmp, src, size); | |
73 | fn(tfm, tmp, tmp); | |
74 | memcpy(dst, tmp, size); | |
75 | } | |
76 | ||
77 | static void cipher_encrypt_unaligned(struct crypto_tfm *tfm, | |
78 | u8 *dst, const u8 *src) | |
79 | { | |
80 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); | |
81 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; | |
82 | ||
83 | if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) { | |
84 | cipher_crypt_unaligned(cipher->cia_encrypt, tfm, dst, src); | |
85 | return; | |
86 | } | |
87 | ||
88 | cipher->cia_encrypt(tfm, dst, src); | |
89 | } | |
90 | ||
91 | static void cipher_decrypt_unaligned(struct crypto_tfm *tfm, | |
92 | u8 *dst, const u8 *src) | |
93 | { | |
94 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); | |
95 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; | |
96 | ||
97 | if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) { | |
98 | cipher_crypt_unaligned(cipher->cia_decrypt, tfm, dst, src); | |
99 | return; | |
100 | } | |
101 | ||
102 | cipher->cia_decrypt(tfm, dst, src); | |
103 | } | |
104 | ||
1da177e4 LT |
105 | int crypto_init_cipher_ops(struct crypto_tfm *tfm) |
106 | { | |
1da177e4 | 107 | struct cipher_tfm *ops = &tfm->crt_cipher; |
f28776a3 | 108 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; |
1da177e4 LT |
109 | |
110 | ops->cit_setkey = setkey; | |
f28776a3 HX |
111 | ops->cit_encrypt_one = crypto_tfm_alg_alignmask(tfm) ? |
112 | cipher_encrypt_unaligned : cipher->cia_encrypt; | |
113 | ops->cit_decrypt_one = crypto_tfm_alg_alignmask(tfm) ? | |
114 | cipher_decrypt_unaligned : cipher->cia_decrypt; | |
1da177e4 | 115 | |
f1ddcaf3 | 116 | return 0; |
1da177e4 LT |
117 | } |
118 | ||
119 | void crypto_exit_cipher_ops(struct crypto_tfm *tfm) | |
120 | { | |
1da177e4 | 121 | } |