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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> |
4943ba16 | 20 | #include <linux/crypto.h> |
df6b35f4 | 21 | #include <asm/fpu/api.h> |
150c7e85 HY |
22 | |
23 | struct crypto_fpu_ctx { | |
24 | struct crypto_blkcipher *child; | |
25 | }; | |
26 | ||
27 | static int crypto_fpu_setkey(struct crypto_tfm *parent, const u8 *key, | |
28 | unsigned int keylen) | |
29 | { | |
30 | struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(parent); | |
31 | struct crypto_blkcipher *child = ctx->child; | |
32 | int err; | |
33 | ||
34 | crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK); | |
35 | crypto_blkcipher_set_flags(child, crypto_tfm_get_flags(parent) & | |
36 | CRYPTO_TFM_REQ_MASK); | |
37 | err = crypto_blkcipher_setkey(child, key, keylen); | |
38 | crypto_tfm_set_flags(parent, crypto_blkcipher_get_flags(child) & | |
39 | CRYPTO_TFM_RES_MASK); | |
40 | return err; | |
41 | } | |
42 | ||
43 | static int crypto_fpu_encrypt(struct blkcipher_desc *desc_in, | |
44 | struct scatterlist *dst, struct scatterlist *src, | |
45 | unsigned int nbytes) | |
46 | { | |
47 | int err; | |
48 | struct crypto_fpu_ctx *ctx = crypto_blkcipher_ctx(desc_in->tfm); | |
49 | struct crypto_blkcipher *child = ctx->child; | |
50 | struct blkcipher_desc desc = { | |
51 | .tfm = child, | |
52 | .info = desc_in->info, | |
b6f34d44 | 53 | .flags = desc_in->flags & ~CRYPTO_TFM_REQ_MAY_SLEEP, |
150c7e85 HY |
54 | }; |
55 | ||
56 | kernel_fpu_begin(); | |
57 | err = crypto_blkcipher_crt(desc.tfm)->encrypt(&desc, dst, src, nbytes); | |
58 | kernel_fpu_end(); | |
59 | return err; | |
60 | } | |
61 | ||
62 | static int crypto_fpu_decrypt(struct blkcipher_desc *desc_in, | |
63 | struct scatterlist *dst, struct scatterlist *src, | |
64 | unsigned int nbytes) | |
65 | { | |
66 | int err; | |
67 | struct crypto_fpu_ctx *ctx = crypto_blkcipher_ctx(desc_in->tfm); | |
68 | struct crypto_blkcipher *child = ctx->child; | |
69 | struct blkcipher_desc desc = { | |
70 | .tfm = child, | |
71 | .info = desc_in->info, | |
b6f34d44 | 72 | .flags = desc_in->flags & ~CRYPTO_TFM_REQ_MAY_SLEEP, |
150c7e85 HY |
73 | }; |
74 | ||
75 | kernel_fpu_begin(); | |
76 | err = crypto_blkcipher_crt(desc.tfm)->decrypt(&desc, dst, src, nbytes); | |
77 | kernel_fpu_end(); | |
78 | return err; | |
79 | } | |
80 | ||
81 | static int crypto_fpu_init_tfm(struct crypto_tfm *tfm) | |
82 | { | |
83 | struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); | |
84 | struct crypto_spawn *spawn = crypto_instance_ctx(inst); | |
85 | struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(tfm); | |
86 | struct crypto_blkcipher *cipher; | |
87 | ||
88 | cipher = crypto_spawn_blkcipher(spawn); | |
89 | if (IS_ERR(cipher)) | |
90 | return PTR_ERR(cipher); | |
91 | ||
92 | ctx->child = cipher; | |
93 | return 0; | |
94 | } | |
95 | ||
96 | static void crypto_fpu_exit_tfm(struct crypto_tfm *tfm) | |
97 | { | |
98 | struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(tfm); | |
99 | crypto_free_blkcipher(ctx->child); | |
100 | } | |
101 | ||
102 | static struct crypto_instance *crypto_fpu_alloc(struct rtattr **tb) | |
103 | { | |
104 | struct crypto_instance *inst; | |
105 | struct crypto_alg *alg; | |
106 | int err; | |
107 | ||
108 | err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER); | |
109 | if (err) | |
110 | return ERR_PTR(err); | |
111 | ||
112 | alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER, | |
113 | CRYPTO_ALG_TYPE_MASK); | |
114 | if (IS_ERR(alg)) | |
115 | return ERR_CAST(alg); | |
116 | ||
117 | inst = crypto_alloc_instance("fpu", alg); | |
118 | if (IS_ERR(inst)) | |
119 | goto out_put_alg; | |
120 | ||
121 | inst->alg.cra_flags = alg->cra_flags; | |
122 | inst->alg.cra_priority = alg->cra_priority; | |
123 | inst->alg.cra_blocksize = alg->cra_blocksize; | |
124 | inst->alg.cra_alignmask = alg->cra_alignmask; | |
125 | inst->alg.cra_type = alg->cra_type; | |
126 | inst->alg.cra_blkcipher.ivsize = alg->cra_blkcipher.ivsize; | |
127 | inst->alg.cra_blkcipher.min_keysize = alg->cra_blkcipher.min_keysize; | |
128 | inst->alg.cra_blkcipher.max_keysize = alg->cra_blkcipher.max_keysize; | |
129 | inst->alg.cra_ctxsize = sizeof(struct crypto_fpu_ctx); | |
130 | inst->alg.cra_init = crypto_fpu_init_tfm; | |
131 | inst->alg.cra_exit = crypto_fpu_exit_tfm; | |
132 | inst->alg.cra_blkcipher.setkey = crypto_fpu_setkey; | |
133 | inst->alg.cra_blkcipher.encrypt = crypto_fpu_encrypt; | |
134 | inst->alg.cra_blkcipher.decrypt = crypto_fpu_decrypt; | |
135 | ||
136 | out_put_alg: | |
137 | crypto_mod_put(alg); | |
138 | return inst; | |
139 | } | |
140 | ||
141 | static void crypto_fpu_free(struct crypto_instance *inst) | |
142 | { | |
143 | crypto_drop_spawn(crypto_instance_ctx(inst)); | |
144 | kfree(inst); | |
145 | } | |
146 | ||
147 | static struct crypto_template crypto_fpu_tmpl = { | |
148 | .name = "fpu", | |
149 | .alloc = crypto_fpu_alloc, | |
150 | .free = crypto_fpu_free, | |
151 | .module = THIS_MODULE, | |
152 | }; | |
153 | ||
b23b6451 | 154 | int __init crypto_fpu_init(void) |
150c7e85 HY |
155 | { |
156 | return crypto_register_template(&crypto_fpu_tmpl); | |
157 | } | |
158 | ||
de1e0087 | 159 | void crypto_fpu_exit(void) |
150c7e85 HY |
160 | { |
161 | crypto_unregister_template(&crypto_fpu_tmpl); | |
162 | } | |
4943ba16 KC |
163 | |
164 | MODULE_ALIAS_CRYPTO("fpu"); |