iwlwifi: tt: move ucode_loaded check under mutex
[linux-2.6-microblaze.git] / crypto / seqiv.c
1 /*
2  * seqiv: Sequence Number IV Generator
3  *
4  * This generator generates an IV based on a sequence number by xoring it
5  * with a salt.  This algorithm is mainly useful for CTR and similar modes.
6  *
7  * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
8  *
9  * This program is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU General Public License as published by the Free
11  * Software Foundation; either version 2 of the License, or (at your option)
12  * any later version.
13  *
14  */
15
16 #include <crypto/internal/geniv.h>
17 #include <crypto/scatterwalk.h>
18 #include <crypto/skcipher.h>
19 #include <linux/err.h>
20 #include <linux/init.h>
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/slab.h>
24 #include <linux/string.h>
25
26 static void seqiv_free(struct crypto_instance *inst);
27
28 static void seqiv_aead_encrypt_complete2(struct aead_request *req, int err)
29 {
30         struct aead_request *subreq = aead_request_ctx(req);
31         struct crypto_aead *geniv;
32
33         if (err == -EINPROGRESS)
34                 return;
35
36         if (err)
37                 goto out;
38
39         geniv = crypto_aead_reqtfm(req);
40         memcpy(req->iv, subreq->iv, crypto_aead_ivsize(geniv));
41
42 out:
43         kzfree(subreq->iv);
44 }
45
46 static void seqiv_aead_encrypt_complete(struct crypto_async_request *base,
47                                         int err)
48 {
49         struct aead_request *req = base->data;
50
51         seqiv_aead_encrypt_complete2(req, err);
52         aead_request_complete(req, err);
53 }
54
55 static int seqiv_aead_encrypt(struct aead_request *req)
56 {
57         struct crypto_aead *geniv = crypto_aead_reqtfm(req);
58         struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv);
59         struct aead_request *subreq = aead_request_ctx(req);
60         crypto_completion_t compl;
61         void *data;
62         u8 *info;
63         unsigned int ivsize = 8;
64         int err;
65
66         if (req->cryptlen < ivsize)
67                 return -EINVAL;
68
69         aead_request_set_tfm(subreq, ctx->child);
70
71         compl = req->base.complete;
72         data = req->base.data;
73         info = req->iv;
74
75         if (req->src != req->dst) {
76                 SKCIPHER_REQUEST_ON_STACK(nreq, ctx->sknull);
77
78                 skcipher_request_set_tfm(nreq, ctx->sknull);
79                 skcipher_request_set_callback(nreq, req->base.flags,
80                                               NULL, NULL);
81                 skcipher_request_set_crypt(nreq, req->src, req->dst,
82                                            req->assoclen + req->cryptlen,
83                                            NULL);
84
85                 err = crypto_skcipher_encrypt(nreq);
86                 if (err)
87                         return err;
88         }
89
90         if (unlikely(!IS_ALIGNED((unsigned long)info,
91                                  crypto_aead_alignmask(geniv) + 1))) {
92                 info = kmalloc(ivsize, req->base.flags &
93                                        CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL:
94                                                                   GFP_ATOMIC);
95                 if (!info)
96                         return -ENOMEM;
97
98                 memcpy(info, req->iv, ivsize);
99                 compl = seqiv_aead_encrypt_complete;
100                 data = req;
101         }
102
103         aead_request_set_callback(subreq, req->base.flags, compl, data);
104         aead_request_set_crypt(subreq, req->dst, req->dst,
105                                req->cryptlen - ivsize, info);
106         aead_request_set_ad(subreq, req->assoclen + ivsize);
107
108         crypto_xor(info, ctx->salt, ivsize);
109         scatterwalk_map_and_copy(info, req->dst, req->assoclen, ivsize, 1);
110
111         err = crypto_aead_encrypt(subreq);
112         if (unlikely(info != req->iv))
113                 seqiv_aead_encrypt_complete2(req, err);
114         return err;
115 }
116
117 static int seqiv_aead_decrypt(struct aead_request *req)
118 {
119         struct crypto_aead *geniv = crypto_aead_reqtfm(req);
120         struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv);
121         struct aead_request *subreq = aead_request_ctx(req);
122         crypto_completion_t compl;
123         void *data;
124         unsigned int ivsize = 8;
125
126         if (req->cryptlen < ivsize + crypto_aead_authsize(geniv))
127                 return -EINVAL;
128
129         aead_request_set_tfm(subreq, ctx->child);
130
131         compl = req->base.complete;
132         data = req->base.data;
133
134         aead_request_set_callback(subreq, req->base.flags, compl, data);
135         aead_request_set_crypt(subreq, req->src, req->dst,
136                                req->cryptlen - ivsize, req->iv);
137         aead_request_set_ad(subreq, req->assoclen + ivsize);
138
139         scatterwalk_map_and_copy(req->iv, req->src, req->assoclen, ivsize, 0);
140
141         return crypto_aead_decrypt(subreq);
142 }
143
144 static int seqiv_aead_create(struct crypto_template *tmpl, struct rtattr **tb)
145 {
146         struct aead_instance *inst;
147         struct crypto_aead_spawn *spawn;
148         struct aead_alg *alg;
149         int err;
150
151         inst = aead_geniv_alloc(tmpl, tb, 0, 0);
152
153         if (IS_ERR(inst))
154                 return PTR_ERR(inst);
155
156         spawn = aead_instance_ctx(inst);
157         alg = crypto_spawn_aead_alg(spawn);
158
159         err = -EINVAL;
160         if (inst->alg.ivsize != sizeof(u64))
161                 goto free_inst;
162
163         inst->alg.encrypt = seqiv_aead_encrypt;
164         inst->alg.decrypt = seqiv_aead_decrypt;
165
166         inst->alg.init = aead_init_geniv;
167         inst->alg.exit = aead_exit_geniv;
168
169         inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx);
170         inst->alg.base.cra_ctxsize += inst->alg.ivsize;
171
172         err = aead_register_instance(tmpl, inst);
173         if (err)
174                 goto free_inst;
175
176 out:
177         return err;
178
179 free_inst:
180         aead_geniv_free(inst);
181         goto out;
182 }
183
184 static int seqiv_create(struct crypto_template *tmpl, struct rtattr **tb)
185 {
186         struct crypto_attr_type *algt;
187
188         algt = crypto_get_attr_type(tb);
189         if (IS_ERR(algt))
190                 return PTR_ERR(algt);
191
192         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK)
193                 return -EINVAL;
194
195         return seqiv_aead_create(tmpl, tb);
196 }
197
198 static void seqiv_free(struct crypto_instance *inst)
199 {
200         aead_geniv_free(aead_instance(inst));
201 }
202
203 static struct crypto_template seqiv_tmpl = {
204         .name = "seqiv",
205         .create = seqiv_create,
206         .free = seqiv_free,
207         .module = THIS_MODULE,
208 };
209
210 static int __init seqiv_module_init(void)
211 {
212         return crypto_register_template(&seqiv_tmpl);
213 }
214
215 static void __exit seqiv_module_exit(void)
216 {
217         crypto_unregister_template(&seqiv_tmpl);
218 }
219
220 module_init(seqiv_module_init);
221 module_exit(seqiv_module_exit);
222
223 MODULE_LICENSE("GPL");
224 MODULE_DESCRIPTION("Sequence Number IV Generator");
225 MODULE_ALIAS_CRYPTO("seqiv");