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 <linux/kernel.h>
13 #include <linux/crypto.h>
14 #include <linux/errno.h>
15 #include <linux/slab.h>
16 #include <linux/string.h>
17 #include "internal.h"
18
setkey_unaligned(struct crypto_cipher *tfm, const u8 *key, unsigned int keylen)19 static int setkey_unaligned(struct crypto_cipher *tfm, const u8 *key,
20 unsigned int keylen)
21 {
22 struct cipher_alg *cia = crypto_cipher_alg(tfm);
23 unsigned long alignmask = crypto_cipher_alignmask(tfm);
24 int ret;
25 u8 *buffer, *alignbuffer;
26 unsigned long absize;
27
28 absize = keylen + alignmask;
29 buffer = kmalloc(absize, GFP_ATOMIC);
30 if (!buffer)
31 return -ENOMEM;
32
33 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
34 memcpy(alignbuffer, key, keylen);
35 ret = cia->cia_setkey(crypto_cipher_tfm(tfm), alignbuffer, keylen);
36 kfree_sensitive(buffer);
37 return ret;
38
39 }
40
crypto_cipher_setkey(struct crypto_cipher *tfm, const u8 *key, unsigned int keylen)41 int crypto_cipher_setkey(struct crypto_cipher *tfm,
42 const u8 *key, unsigned int keylen)
43 {
44 struct cipher_alg *cia = crypto_cipher_alg(tfm);
45 unsigned long alignmask = crypto_cipher_alignmask(tfm);
46
47 if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize)
48 return -EINVAL;
49
50 if ((unsigned long)key & alignmask)
51 return setkey_unaligned(tfm, key, keylen);
52
53 return cia->cia_setkey(crypto_cipher_tfm(tfm), key, keylen);
54 }
55 EXPORT_SYMBOL_GPL(crypto_cipher_setkey);
56
cipher_crypt_one(struct crypto_cipher *tfm, u8 *dst, const u8 *src, bool enc)57 static inline void cipher_crypt_one(struct crypto_cipher *tfm,
58 u8 *dst, const u8 *src, bool enc)
59 {
60 unsigned long alignmask = crypto_cipher_alignmask(tfm);
61 struct cipher_alg *cia = crypto_cipher_alg(tfm);
62 void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
63 enc ? cia->cia_encrypt : cia->cia_decrypt;
64
65 if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) {
66 unsigned int bs = crypto_cipher_blocksize(tfm);
67 u8 buffer[MAX_CIPHER_BLOCKSIZE + MAX_CIPHER_ALIGNMASK];
68 u8 *tmp = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
69
70 memcpy(tmp, src, bs);
71 fn(crypto_cipher_tfm(tfm), tmp, tmp);
72 memcpy(dst, tmp, bs);
73 } else {
74 fn(crypto_cipher_tfm(tfm), dst, src);
75 }
76 }
77
crypto_cipher_encrypt_one(struct crypto_cipher *tfm, u8 *dst, const u8 *src)78 void crypto_cipher_encrypt_one(struct crypto_cipher *tfm,
79 u8 *dst, const u8 *src)
80 {
81 cipher_crypt_one(tfm, dst, src, true);
82 }
83 EXPORT_SYMBOL_GPL(crypto_cipher_encrypt_one);
84
crypto_cipher_decrypt_one(struct crypto_cipher *tfm, u8 *dst, const u8 *src)85 void crypto_cipher_decrypt_one(struct crypto_cipher *tfm,
86 u8 *dst, const u8 *src)
87 {
88 cipher_crypt_one(tfm, dst, src, false);
89 }
90 EXPORT_SYMBOL_GPL(crypto_cipher_decrypt_one);
91