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Source at commit b13e7eb172b6f08e5fc22da162bdde5fcde201b5 created 11 years 11 months ago. By Maarten ter Huurne, fbcon: Add 6x10 font | |
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1 | /* |
2 | * Cryptographic API. |
3 | * |
4 | * Cipher operations. |
5 | * |
6 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> |
7 | * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au> |
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 | */ |
15 | |
16 | #include <linux/kernel.h> |
17 | #include <linux/crypto.h> |
18 | #include <linux/errno.h> |
19 | #include <linux/slab.h> |
20 | #include <linux/string.h> |
21 | #include "internal.h" |
22 | |
23 | static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key, |
24 | unsigned int keylen) |
25 | { |
26 | struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher; |
27 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); |
28 | int ret; |
29 | u8 *buffer, *alignbuffer; |
30 | unsigned long absize; |
31 | |
32 | absize = keylen + alignmask; |
33 | buffer = kmalloc(absize, GFP_ATOMIC); |
34 | if (!buffer) |
35 | return -ENOMEM; |
36 | |
37 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); |
38 | memcpy(alignbuffer, key, keylen); |
39 | ret = cia->cia_setkey(tfm, alignbuffer, keylen); |
40 | memset(alignbuffer, 0, keylen); |
41 | kfree(buffer); |
42 | return ret; |
43 | |
44 | } |
45 | |
46 | static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) |
47 | { |
48 | struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher; |
49 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); |
50 | |
51 | tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK; |
52 | if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize) { |
53 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; |
54 | return -EINVAL; |
55 | } |
56 | |
57 | if ((unsigned long)key & alignmask) |
58 | return setkey_unaligned(tfm, key, keylen); |
59 | |
60 | return cia->cia_setkey(tfm, key, keylen); |
61 | } |
62 | |
63 | static void cipher_crypt_unaligned(void (*fn)(struct crypto_tfm *, u8 *, |
64 | const u8 *), |
65 | struct crypto_tfm *tfm, |
66 | u8 *dst, const u8 *src) |
67 | { |
68 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); |
69 | unsigned int size = crypto_tfm_alg_blocksize(tfm); |
70 | u8 buffer[size + alignmask]; |
71 | u8 *tmp = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); |
72 | |
73 | memcpy(tmp, src, size); |
74 | fn(tfm, tmp, tmp); |
75 | memcpy(dst, tmp, size); |
76 | } |
77 | |
78 | static void cipher_encrypt_unaligned(struct crypto_tfm *tfm, |
79 | u8 *dst, const u8 *src) |
80 | { |
81 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); |
82 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; |
83 | |
84 | if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) { |
85 | cipher_crypt_unaligned(cipher->cia_encrypt, tfm, dst, src); |
86 | return; |
87 | } |
88 | |
89 | cipher->cia_encrypt(tfm, dst, src); |
90 | } |
91 | |
92 | static void cipher_decrypt_unaligned(struct crypto_tfm *tfm, |
93 | u8 *dst, const u8 *src) |
94 | { |
95 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); |
96 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; |
97 | |
98 | if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) { |
99 | cipher_crypt_unaligned(cipher->cia_decrypt, tfm, dst, src); |
100 | return; |
101 | } |
102 | |
103 | cipher->cia_decrypt(tfm, dst, src); |
104 | } |
105 | |
106 | int crypto_init_cipher_ops(struct crypto_tfm *tfm) |
107 | { |
108 | struct cipher_tfm *ops = &tfm->crt_cipher; |
109 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; |
110 | |
111 | ops->cit_setkey = setkey; |
112 | ops->cit_encrypt_one = crypto_tfm_alg_alignmask(tfm) ? |
113 | cipher_encrypt_unaligned : cipher->cia_encrypt; |
114 | ops->cit_decrypt_one = crypto_tfm_alg_alignmask(tfm) ? |
115 | cipher_decrypt_unaligned : cipher->cia_decrypt; |
116 | |
117 | return 0; |
118 | } |
119 | |
120 | void crypto_exit_cipher_ops(struct crypto_tfm *tfm) |
121 | { |
122 | } |
123 |
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od-2011-09-18
v2.6.34-rc5
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