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