1 /*
2  * Symmetric key ciphers.
3  *
4  * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of the GNU General Public License as published by the Free
8  * Software Foundation; either version 2 of the License, or (at your option)
9  * any later version.
10  *
11  */
12 
13 #ifndef _CRYPTO_INTERNAL_SKCIPHER_H
14 #define _CRYPTO_INTERNAL_SKCIPHER_H
15 
16 #include <crypto/algapi.h>
17 #include <crypto/skcipher.h>
18 #include <linux/list.h>
19 #include <linux/types.h>
20 
21 struct aead_request;
22 struct rtattr;
23 
24 struct skcipher_instance {
25 	void (*free)(struct skcipher_instance *inst);
26 	union {
27 		struct {
28 			char head[offsetof(struct skcipher_alg, base)];
29 			struct crypto_instance base;
30 		} s;
31 		struct skcipher_alg alg;
32 	};
33 };
34 
35 struct crypto_skcipher_spawn {
36 	struct crypto_spawn base;
37 };
38 
39 struct skcipher_walk {
40 	union {
41 		struct {
42 			struct page *page;
43 			unsigned long offset;
44 		} phys;
45 
46 		struct {
47 			u8 *page;
48 			void *addr;
49 		} virt;
50 	} src, dst;
51 
52 	struct scatter_walk in;
53 	unsigned int nbytes;
54 
55 	struct scatter_walk out;
56 	unsigned int total;
57 
58 	struct list_head buffers;
59 
60 	u8 *page;
61 	u8 *buffer;
62 	u8 *oiv;
63 	void *iv;
64 
65 	unsigned int ivsize;
66 
67 	int flags;
68 	unsigned int blocksize;
69 	unsigned int stride;
70 	unsigned int alignmask;
71 };
72 
73 extern const struct crypto_type crypto_givcipher_type;
74 
75 static inline struct crypto_instance *skcipher_crypto_instance(
76 	struct skcipher_instance *inst)
77 {
78 	return &inst->s.base;
79 }
80 
81 static inline struct skcipher_instance *skcipher_alg_instance(
82 	struct crypto_skcipher *skcipher)
83 {
84 	return container_of(crypto_skcipher_alg(skcipher),
85 			    struct skcipher_instance, alg);
86 }
87 
88 static inline void *skcipher_instance_ctx(struct skcipher_instance *inst)
89 {
90 	return crypto_instance_ctx(skcipher_crypto_instance(inst));
91 }
92 
93 static inline void skcipher_request_complete(struct skcipher_request *req, int err)
94 {
95 	req->base.complete(&req->base, err);
96 }
97 
98 static inline void crypto_set_skcipher_spawn(
99 	struct crypto_skcipher_spawn *spawn, struct crypto_instance *inst)
100 {
101 	crypto_set_spawn(&spawn->base, inst);
102 }
103 
104 int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
105 			 u32 type, u32 mask);
106 
107 static inline void crypto_drop_skcipher(struct crypto_skcipher_spawn *spawn)
108 {
109 	crypto_drop_spawn(&spawn->base);
110 }
111 
112 static inline struct skcipher_alg *crypto_skcipher_spawn_alg(
113 	struct crypto_skcipher_spawn *spawn)
114 {
115 	return container_of(spawn->base.alg, struct skcipher_alg, base);
116 }
117 
118 static inline struct skcipher_alg *crypto_spawn_skcipher_alg(
119 	struct crypto_skcipher_spawn *spawn)
120 {
121 	return crypto_skcipher_spawn_alg(spawn);
122 }
123 
124 static inline struct crypto_skcipher *crypto_spawn_skcipher(
125 	struct crypto_skcipher_spawn *spawn)
126 {
127 	return crypto_spawn_tfm2(&spawn->base);
128 }
129 
130 static inline void crypto_skcipher_set_reqsize(
131 	struct crypto_skcipher *skcipher, unsigned int reqsize)
132 {
133 	skcipher->reqsize = reqsize;
134 }
135 
136 int crypto_register_skcipher(struct skcipher_alg *alg);
137 void crypto_unregister_skcipher(struct skcipher_alg *alg);
138 int crypto_register_skciphers(struct skcipher_alg *algs, int count);
139 void crypto_unregister_skciphers(struct skcipher_alg *algs, int count);
140 int skcipher_register_instance(struct crypto_template *tmpl,
141 			       struct skcipher_instance *inst);
142 
143 int skcipher_walk_done(struct skcipher_walk *walk, int err);
144 int skcipher_walk_virt(struct skcipher_walk *walk,
145 		       struct skcipher_request *req,
146 		       bool atomic);
147 void skcipher_walk_atomise(struct skcipher_walk *walk);
148 int skcipher_walk_async(struct skcipher_walk *walk,
149 			struct skcipher_request *req);
150 int skcipher_walk_aead(struct skcipher_walk *walk, struct aead_request *req,
151 		       bool atomic);
152 int skcipher_walk_aead_encrypt(struct skcipher_walk *walk,
153 			       struct aead_request *req, bool atomic);
154 int skcipher_walk_aead_decrypt(struct skcipher_walk *walk,
155 			       struct aead_request *req, bool atomic);
156 void skcipher_walk_complete(struct skcipher_walk *walk, int err);
157 
158 static inline void ablkcipher_request_complete(struct ablkcipher_request *req,
159 					       int err)
160 {
161 	req->base.complete(&req->base, err);
162 }
163 
164 static inline u32 ablkcipher_request_flags(struct ablkcipher_request *req)
165 {
166 	return req->base.flags;
167 }
168 
169 static inline void *crypto_skcipher_ctx(struct crypto_skcipher *tfm)
170 {
171 	return crypto_tfm_ctx(&tfm->base);
172 }
173 
174 static inline void *skcipher_request_ctx(struct skcipher_request *req)
175 {
176 	return req->__ctx;
177 }
178 
179 static inline u32 skcipher_request_flags(struct skcipher_request *req)
180 {
181 	return req->base.flags;
182 }
183 
184 static inline unsigned int crypto_skcipher_alg_min_keysize(
185 	struct skcipher_alg *alg)
186 {
187 	if ((alg->base.cra_flags & CRYPTO_ALG_TYPE_MASK) ==
188 	    CRYPTO_ALG_TYPE_BLKCIPHER)
189 		return alg->base.cra_blkcipher.min_keysize;
190 
191 	if (alg->base.cra_ablkcipher.encrypt)
192 		return alg->base.cra_ablkcipher.min_keysize;
193 
194 	return alg->min_keysize;
195 }
196 
197 static inline unsigned int crypto_skcipher_alg_max_keysize(
198 	struct skcipher_alg *alg)
199 {
200 	if ((alg->base.cra_flags & CRYPTO_ALG_TYPE_MASK) ==
201 	    CRYPTO_ALG_TYPE_BLKCIPHER)
202 		return alg->base.cra_blkcipher.max_keysize;
203 
204 	if (alg->base.cra_ablkcipher.encrypt)
205 		return alg->base.cra_ablkcipher.max_keysize;
206 
207 	return alg->max_keysize;
208 }
209 
210 #endif	/* _CRYPTO_INTERNAL_SKCIPHER_H */
211 
212