1 // SPDX-License-Identifier: GPL-2.0-or-later <<
2 /* 1 /*
3 * Cryptographic API. 2 * Cryptographic API.
4 * 3 *
5 * Single-block cipher operations. !! 4 * Cipher operations.
6 * 5 *
7 * Copyright (c) 2002 James Morris <jmorris@in 6 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
8 * Copyright (c) 2005 Herbert Xu <herbert@gond 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 *
9 */ 14 */
10 15
11 #include <crypto/algapi.h> <<
12 #include <crypto/internal/cipher.h> <<
13 #include <linux/kernel.h> 16 #include <linux/kernel.h>
14 #include <linux/crypto.h> 17 #include <linux/crypto.h>
15 #include <linux/errno.h> 18 #include <linux/errno.h>
16 #include <linux/slab.h> 19 #include <linux/slab.h>
17 #include <linux/string.h> 20 #include <linux/string.h>
18 #include "internal.h" 21 #include "internal.h"
19 22
20 static int setkey_unaligned(struct crypto_ciph !! 23 static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key,
21 unsigned int keyle 24 unsigned int keylen)
22 { 25 {
23 struct cipher_alg *cia = crypto_cipher !! 26 struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher;
24 unsigned long alignmask = crypto_ciphe !! 27 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
25 int ret; 28 int ret;
26 u8 *buffer, *alignbuffer; 29 u8 *buffer, *alignbuffer;
27 unsigned long absize; 30 unsigned long absize;
28 31
29 absize = keylen + alignmask; 32 absize = keylen + alignmask;
30 buffer = kmalloc(absize, GFP_ATOMIC); 33 buffer = kmalloc(absize, GFP_ATOMIC);
31 if (!buffer) 34 if (!buffer)
32 return -ENOMEM; 35 return -ENOMEM;
33 36
34 alignbuffer = (u8 *)ALIGN((unsigned lo 37 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
35 memcpy(alignbuffer, key, keylen); 38 memcpy(alignbuffer, key, keylen);
36 ret = cia->cia_setkey(crypto_cipher_tf !! 39 ret = cia->cia_setkey(tfm, alignbuffer, keylen);
37 kfree_sensitive(buffer); !! 40 memset(alignbuffer, 0, keylen);
>> 41 kfree(buffer);
38 return ret; 42 return ret;
39 43
40 } 44 }
41 45
42 int crypto_cipher_setkey(struct crypto_cipher !! 46 static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
43 const u8 *key, unsign <<
44 { 47 {
45 struct cipher_alg *cia = crypto_cipher !! 48 struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher;
46 unsigned long alignmask = crypto_ciphe !! 49 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
47 50
48 if (keylen < cia->cia_min_keysize || k !! 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;
49 return -EINVAL; 54 return -EINVAL;
>> 55 }
50 56
51 if ((unsigned long)key & alignmask) 57 if ((unsigned long)key & alignmask)
52 return setkey_unaligned(tfm, k 58 return setkey_unaligned(tfm, key, keylen);
53 59
54 return cia->cia_setkey(crypto_cipher_t !! 60 return cia->cia_setkey(tfm, key, keylen);
55 } 61 }
56 EXPORT_SYMBOL_NS_GPL(crypto_cipher_setkey, CRY <<
57 62
58 static inline void cipher_crypt_one(struct cry !! 63 static void cipher_crypt_unaligned(void (*fn)(struct crypto_tfm *, u8 *,
59 u8 *dst, c !! 64 const u8 *),
>> 65 struct crypto_tfm *tfm,
>> 66 u8 *dst, const u8 *src)
60 { 67 {
61 unsigned long alignmask = crypto_ciphe !! 68 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
62 struct cipher_alg *cia = crypto_cipher !! 69 unsigned int size = crypto_tfm_alg_blocksize(tfm);
63 void (*fn)(struct crypto_tfm *, u8 *, !! 70 u8 buffer[size + alignmask];
64 enc ? cia->cia_encrypt : cia-> !! 71 u8 *tmp = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
65 72
66 if (unlikely(((unsigned long)dst | (un !! 73 memcpy(tmp, src, size);
67 unsigned int bs = crypto_ciphe !! 74 fn(tfm, tmp, tmp);
68 u8 buffer[MAX_CIPHER_BLOCKSIZE !! 75 memcpy(dst, tmp, size);
69 u8 *tmp = (u8 *)ALIGN((unsigne <<
70 <<
71 memcpy(tmp, src, bs); <<
72 fn(crypto_cipher_tfm(tfm), tmp <<
73 memcpy(dst, tmp, bs); <<
74 } else { <<
75 fn(crypto_cipher_tfm(tfm), dst <<
76 } <<
77 } 76 }
78 77
79 void crypto_cipher_encrypt_one(struct crypto_c !! 78 static void cipher_encrypt_unaligned(struct crypto_tfm *tfm,
80 u8 *dst, const !! 79 u8 *dst, const u8 *src)
81 { 80 {
82 cipher_crypt_one(tfm, dst, src, true); !! 81 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
83 } !! 82 struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher;
84 EXPORT_SYMBOL_NS_GPL(crypto_cipher_encrypt_one <<
85 83
86 void crypto_cipher_decrypt_one(struct crypto_c !! 84 if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) {
87 u8 *dst, const !! 85 cipher_crypt_unaligned(cipher->cia_encrypt, tfm, dst, src);
88 { !! 86 return;
89 cipher_crypt_one(tfm, dst, src, false) !! 87 }
>> 88
>> 89 cipher->cia_encrypt(tfm, dst, src);
90 } 90 }
91 EXPORT_SYMBOL_NS_GPL(crypto_cipher_decrypt_one <<
92 91
93 struct crypto_cipher *crypto_clone_cipher(stru !! 92 static void cipher_decrypt_unaligned(struct crypto_tfm *tfm,
>> 93 u8 *dst, const u8 *src)
94 { 94 {
95 struct crypto_tfm *tfm = crypto_cipher !! 95 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
96 struct crypto_alg *alg = tfm->__crt_al !! 96 struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher;
97 struct crypto_cipher *ncipher; <<
98 struct crypto_tfm *ntfm; <<
99 <<
100 if (alg->cra_init) <<
101 return ERR_PTR(-ENOSYS); <<
102 <<
103 if (unlikely(!crypto_mod_get(alg))) <<
104 return ERR_PTR(-ESTALE); <<
105 97
106 ntfm = __crypto_alloc_tfmgfp(alg, CRYP !! 98 if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) {
107 CRYPTO_AL !! 99 cipher_crypt_unaligned(cipher->cia_decrypt, tfm, dst, src);
108 if (IS_ERR(ntfm)) { !! 100 return;
109 crypto_mod_put(alg); <<
110 return ERR_CAST(ntfm); <<
111 } 101 }
112 102
113 ntfm->crt_flags = tfm->crt_flags; !! 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;
114 110
115 ncipher = __crypto_cipher_cast(ntfm); !! 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;
116 116
117 return ncipher; !! 117 return 0;
118 } 118 }
119 EXPORT_SYMBOL_GPL(crypto_clone_cipher); <<
120 119
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