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