1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Cryptographic API.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Single-block cipher operations.
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
8*4882a593Smuzhiyun * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <crypto/algapi.h>
12*4882a593Smuzhiyun #include <crypto/internal/cipher.h>
13*4882a593Smuzhiyun #include <linux/kernel.h>
14*4882a593Smuzhiyun #include <linux/crypto.h>
15*4882a593Smuzhiyun #include <linux/errno.h>
16*4882a593Smuzhiyun #include <linux/slab.h>
17*4882a593Smuzhiyun #include <linux/string.h>
18*4882a593Smuzhiyun #include "internal.h"
19*4882a593Smuzhiyun
setkey_unaligned(struct crypto_cipher * tfm,const u8 * key,unsigned int keylen)20*4882a593Smuzhiyun static int setkey_unaligned(struct crypto_cipher *tfm, const u8 *key,
21*4882a593Smuzhiyun unsigned int keylen)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun struct cipher_alg *cia = crypto_cipher_alg(tfm);
24*4882a593Smuzhiyun unsigned long alignmask = crypto_cipher_alignmask(tfm);
25*4882a593Smuzhiyun int ret;
26*4882a593Smuzhiyun u8 *buffer, *alignbuffer;
27*4882a593Smuzhiyun unsigned long absize;
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun absize = keylen + alignmask;
30*4882a593Smuzhiyun buffer = kmalloc(absize, GFP_ATOMIC);
31*4882a593Smuzhiyun if (!buffer)
32*4882a593Smuzhiyun return -ENOMEM;
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
35*4882a593Smuzhiyun memcpy(alignbuffer, key, keylen);
36*4882a593Smuzhiyun ret = cia->cia_setkey(crypto_cipher_tfm(tfm), alignbuffer, keylen);
37*4882a593Smuzhiyun memset(alignbuffer, 0, keylen);
38*4882a593Smuzhiyun kfree(buffer);
39*4882a593Smuzhiyun return ret;
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun }
42*4882a593Smuzhiyun
crypto_cipher_setkey(struct crypto_cipher * tfm,const u8 * key,unsigned int keylen)43*4882a593Smuzhiyun int crypto_cipher_setkey(struct crypto_cipher *tfm,
44*4882a593Smuzhiyun const u8 *key, unsigned int keylen)
45*4882a593Smuzhiyun {
46*4882a593Smuzhiyun struct cipher_alg *cia = crypto_cipher_alg(tfm);
47*4882a593Smuzhiyun unsigned long alignmask = crypto_cipher_alignmask(tfm);
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize)
50*4882a593Smuzhiyun return -EINVAL;
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun if ((unsigned long)key & alignmask)
53*4882a593Smuzhiyun return setkey_unaligned(tfm, key, keylen);
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun return cia->cia_setkey(crypto_cipher_tfm(tfm), key, keylen);
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun EXPORT_SYMBOL_NS_GPL(crypto_cipher_setkey, CRYPTO_INTERNAL);
58*4882a593Smuzhiyun
cipher_crypt_one(struct crypto_cipher * tfm,u8 * dst,const u8 * src,bool enc)59*4882a593Smuzhiyun static inline void cipher_crypt_one(struct crypto_cipher *tfm,
60*4882a593Smuzhiyun u8 *dst, const u8 *src, bool enc)
61*4882a593Smuzhiyun {
62*4882a593Smuzhiyun unsigned long alignmask = crypto_cipher_alignmask(tfm);
63*4882a593Smuzhiyun struct cipher_alg *cia = crypto_cipher_alg(tfm);
64*4882a593Smuzhiyun void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
65*4882a593Smuzhiyun enc ? cia->cia_encrypt : cia->cia_decrypt;
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) {
68*4882a593Smuzhiyun unsigned int bs = crypto_cipher_blocksize(tfm);
69*4882a593Smuzhiyun u8 buffer[MAX_CIPHER_BLOCKSIZE + MAX_CIPHER_ALIGNMASK];
70*4882a593Smuzhiyun u8 *tmp = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun memcpy(tmp, src, bs);
73*4882a593Smuzhiyun fn(crypto_cipher_tfm(tfm), tmp, tmp);
74*4882a593Smuzhiyun memcpy(dst, tmp, bs);
75*4882a593Smuzhiyun } else {
76*4882a593Smuzhiyun fn(crypto_cipher_tfm(tfm), dst, src);
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun }
79*4882a593Smuzhiyun
crypto_cipher_encrypt_one(struct crypto_cipher * tfm,u8 * dst,const u8 * src)80*4882a593Smuzhiyun void crypto_cipher_encrypt_one(struct crypto_cipher *tfm,
81*4882a593Smuzhiyun u8 *dst, const u8 *src)
82*4882a593Smuzhiyun {
83*4882a593Smuzhiyun cipher_crypt_one(tfm, dst, src, true);
84*4882a593Smuzhiyun }
85*4882a593Smuzhiyun EXPORT_SYMBOL_NS_GPL(crypto_cipher_encrypt_one, CRYPTO_INTERNAL);
86*4882a593Smuzhiyun
crypto_cipher_decrypt_one(struct crypto_cipher * tfm,u8 * dst,const u8 * src)87*4882a593Smuzhiyun void crypto_cipher_decrypt_one(struct crypto_cipher *tfm,
88*4882a593Smuzhiyun u8 *dst, const u8 *src)
89*4882a593Smuzhiyun {
90*4882a593Smuzhiyun cipher_crypt_one(tfm, dst, src, false);
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun EXPORT_SYMBOL_NS_GPL(crypto_cipher_decrypt_one, CRYPTO_INTERNAL);
93