Commit | Line | Data |
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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 LT |
22 | |
23 | static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) | |
24 | { | |
25 | struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher; | |
26 | ||
560c06ae | 27 | tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK; |
1da177e4 LT |
28 | if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize) { |
29 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
30 | return -EINVAL; | |
31 | } else | |
560c06ae | 32 | return cia->cia_setkey(tfm, key, keylen); |
1da177e4 LT |
33 | } |
34 | ||
f28776a3 HX |
35 | static void cipher_crypt_unaligned(void (*fn)(struct crypto_tfm *, u8 *, |
36 | const u8 *), | |
37 | struct crypto_tfm *tfm, | |
38 | u8 *dst, const u8 *src) | |
39 | { | |
40 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); | |
41 | unsigned int size = crypto_tfm_alg_blocksize(tfm); | |
42 | u8 buffer[size + alignmask]; | |
43 | u8 *tmp = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
44 | ||
45 | memcpy(tmp, src, size); | |
46 | fn(tfm, tmp, tmp); | |
47 | memcpy(dst, tmp, size); | |
48 | } | |
49 | ||
50 | static void cipher_encrypt_unaligned(struct crypto_tfm *tfm, | |
51 | u8 *dst, const u8 *src) | |
52 | { | |
53 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); | |
54 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; | |
55 | ||
56 | if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) { | |
57 | cipher_crypt_unaligned(cipher->cia_encrypt, tfm, dst, src); | |
58 | return; | |
59 | } | |
60 | ||
61 | cipher->cia_encrypt(tfm, dst, src); | |
62 | } | |
63 | ||
64 | static void cipher_decrypt_unaligned(struct crypto_tfm *tfm, | |
65 | u8 *dst, const u8 *src) | |
66 | { | |
67 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); | |
68 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; | |
69 | ||
70 | if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) { | |
71 | cipher_crypt_unaligned(cipher->cia_decrypt, tfm, dst, src); | |
72 | return; | |
73 | } | |
74 | ||
75 | cipher->cia_decrypt(tfm, dst, src); | |
76 | } | |
77 | ||
1da177e4 LT |
78 | int crypto_init_cipher_ops(struct crypto_tfm *tfm) |
79 | { | |
1da177e4 | 80 | struct cipher_tfm *ops = &tfm->crt_cipher; |
f28776a3 | 81 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; |
1da177e4 LT |
82 | |
83 | ops->cit_setkey = setkey; | |
f28776a3 HX |
84 | ops->cit_encrypt_one = crypto_tfm_alg_alignmask(tfm) ? |
85 | cipher_encrypt_unaligned : cipher->cia_encrypt; | |
86 | ops->cit_decrypt_one = crypto_tfm_alg_alignmask(tfm) ? | |
87 | cipher_decrypt_unaligned : cipher->cia_decrypt; | |
1da177e4 | 88 | |
f1ddcaf3 | 89 | return 0; |
1da177e4 LT |
90 | } |
91 | ||
92 | void crypto_exit_cipher_ops(struct crypto_tfm *tfm) | |
93 | { | |
1da177e4 | 94 | } |