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150c7e85 HY |
1 | /* |
2 | * FPU: Wrapper for blkcipher touching fpu | |
3 | * | |
4 | * Copyright (c) Intel Corp. | |
5 | * Author: Huang Ying <ying.huang@intel.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the Free | |
9 | * Software Foundation; either version 2 of the License, or (at your option) | |
10 | * any later version. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <crypto/algapi.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/module.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
150c7e85 HY |
20 | #include <asm/i387.h> |
21 | ||
22 | struct crypto_fpu_ctx { | |
23 | struct crypto_blkcipher *child; | |
24 | }; | |
25 | ||
26 | static int crypto_fpu_setkey(struct crypto_tfm *parent, const u8 *key, | |
27 | unsigned int keylen) | |
28 | { | |
29 | struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(parent); | |
30 | struct crypto_blkcipher *child = ctx->child; | |
31 | int err; | |
32 | ||
33 | crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK); | |
34 | crypto_blkcipher_set_flags(child, crypto_tfm_get_flags(parent) & | |
35 | CRYPTO_TFM_REQ_MASK); | |
36 | err = crypto_blkcipher_setkey(child, key, keylen); | |
37 | crypto_tfm_set_flags(parent, crypto_blkcipher_get_flags(child) & | |
38 | CRYPTO_TFM_RES_MASK); | |
39 | return err; | |
40 | } | |
41 | ||
42 | static int crypto_fpu_encrypt(struct blkcipher_desc *desc_in, | |
43 | struct scatterlist *dst, struct scatterlist *src, | |
44 | unsigned int nbytes) | |
45 | { | |
46 | int err; | |
47 | struct crypto_fpu_ctx *ctx = crypto_blkcipher_ctx(desc_in->tfm); | |
48 | struct crypto_blkcipher *child = ctx->child; | |
49 | struct blkcipher_desc desc = { | |
50 | .tfm = child, | |
51 | .info = desc_in->info, | |
b6f34d44 | 52 | .flags = desc_in->flags & ~CRYPTO_TFM_REQ_MAY_SLEEP, |
150c7e85 HY |
53 | }; |
54 | ||
55 | kernel_fpu_begin(); | |
56 | err = crypto_blkcipher_crt(desc.tfm)->encrypt(&desc, dst, src, nbytes); | |
57 | kernel_fpu_end(); | |
58 | return err; | |
59 | } | |
60 | ||
61 | static int crypto_fpu_decrypt(struct blkcipher_desc *desc_in, | |
62 | struct scatterlist *dst, struct scatterlist *src, | |
63 | unsigned int nbytes) | |
64 | { | |
65 | int err; | |
66 | struct crypto_fpu_ctx *ctx = crypto_blkcipher_ctx(desc_in->tfm); | |
67 | struct crypto_blkcipher *child = ctx->child; | |
68 | struct blkcipher_desc desc = { | |
69 | .tfm = child, | |
70 | .info = desc_in->info, | |
b6f34d44 | 71 | .flags = desc_in->flags & ~CRYPTO_TFM_REQ_MAY_SLEEP, |
150c7e85 HY |
72 | }; |
73 | ||
74 | kernel_fpu_begin(); | |
75 | err = crypto_blkcipher_crt(desc.tfm)->decrypt(&desc, dst, src, nbytes); | |
76 | kernel_fpu_end(); | |
77 | return err; | |
78 | } | |
79 | ||
80 | static int crypto_fpu_init_tfm(struct crypto_tfm *tfm) | |
81 | { | |
82 | struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); | |
83 | struct crypto_spawn *spawn = crypto_instance_ctx(inst); | |
84 | struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(tfm); | |
85 | struct crypto_blkcipher *cipher; | |
86 | ||
87 | cipher = crypto_spawn_blkcipher(spawn); | |
88 | if (IS_ERR(cipher)) | |
89 | return PTR_ERR(cipher); | |
90 | ||
91 | ctx->child = cipher; | |
92 | return 0; | |
93 | } | |
94 | ||
95 | static void crypto_fpu_exit_tfm(struct crypto_tfm *tfm) | |
96 | { | |
97 | struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(tfm); | |
98 | crypto_free_blkcipher(ctx->child); | |
99 | } | |
100 | ||
101 | static struct crypto_instance *crypto_fpu_alloc(struct rtattr **tb) | |
102 | { | |
103 | struct crypto_instance *inst; | |
104 | struct crypto_alg *alg; | |
105 | int err; | |
106 | ||
107 | err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER); | |
108 | if (err) | |
109 | return ERR_PTR(err); | |
110 | ||
111 | alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER, | |
112 | CRYPTO_ALG_TYPE_MASK); | |
113 | if (IS_ERR(alg)) | |
114 | return ERR_CAST(alg); | |
115 | ||
116 | inst = crypto_alloc_instance("fpu", alg); | |
117 | if (IS_ERR(inst)) | |
118 | goto out_put_alg; | |
119 | ||
120 | inst->alg.cra_flags = alg->cra_flags; | |
121 | inst->alg.cra_priority = alg->cra_priority; | |
122 | inst->alg.cra_blocksize = alg->cra_blocksize; | |
123 | inst->alg.cra_alignmask = alg->cra_alignmask; | |
124 | inst->alg.cra_type = alg->cra_type; | |
125 | inst->alg.cra_blkcipher.ivsize = alg->cra_blkcipher.ivsize; | |
126 | inst->alg.cra_blkcipher.min_keysize = alg->cra_blkcipher.min_keysize; | |
127 | inst->alg.cra_blkcipher.max_keysize = alg->cra_blkcipher.max_keysize; | |
128 | inst->alg.cra_ctxsize = sizeof(struct crypto_fpu_ctx); | |
129 | inst->alg.cra_init = crypto_fpu_init_tfm; | |
130 | inst->alg.cra_exit = crypto_fpu_exit_tfm; | |
131 | inst->alg.cra_blkcipher.setkey = crypto_fpu_setkey; | |
132 | inst->alg.cra_blkcipher.encrypt = crypto_fpu_encrypt; | |
133 | inst->alg.cra_blkcipher.decrypt = crypto_fpu_decrypt; | |
134 | ||
135 | out_put_alg: | |
136 | crypto_mod_put(alg); | |
137 | return inst; | |
138 | } | |
139 | ||
140 | static void crypto_fpu_free(struct crypto_instance *inst) | |
141 | { | |
142 | crypto_drop_spawn(crypto_instance_ctx(inst)); | |
143 | kfree(inst); | |
144 | } | |
145 | ||
146 | static struct crypto_template crypto_fpu_tmpl = { | |
147 | .name = "fpu", | |
148 | .alloc = crypto_fpu_alloc, | |
149 | .free = crypto_fpu_free, | |
150 | .module = THIS_MODULE, | |
151 | }; | |
152 | ||
153 | static int __init crypto_fpu_module_init(void) | |
154 | { | |
155 | return crypto_register_template(&crypto_fpu_tmpl); | |
156 | } | |
157 | ||
158 | static void __exit crypto_fpu_module_exit(void) | |
159 | { | |
160 | crypto_unregister_template(&crypto_fpu_tmpl); | |
161 | } | |
162 | ||
163 | module_init(crypto_fpu_module_init); | |
164 | module_exit(crypto_fpu_module_exit); | |
165 | ||
166 | MODULE_LICENSE("GPL"); | |
167 | MODULE_DESCRIPTION("FPU block cipher wrapper"); |