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 static inline struct crypto_instance *skcipher_crypto_instance(
74 	struct skcipher_instance *inst)
75 {
76 	return &inst->s.base;
77 }
78 
79 static inline struct skcipher_instance *skcipher_alg_instance(
80 	struct crypto_skcipher *skcipher)
81 {
82 	return container_of(crypto_skcipher_alg(skcipher),
83 			    struct skcipher_instance, alg);
84 }
85 
86 static inline void *skcipher_instance_ctx(struct skcipher_instance *inst)
87 {
88 	return crypto_instance_ctx(skcipher_crypto_instance(inst));
89 }
90 
91 static inline void skcipher_request_complete(struct skcipher_request *req, int err)
92 {
93 	req->base.complete(&req->base, err);
94 }
95 
96 static inline void crypto_set_skcipher_spawn(
97 	struct crypto_skcipher_spawn *spawn, struct crypto_instance *inst)
98 {
99 	crypto_set_spawn(&spawn->base, inst);
100 }
101 
102 int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
103 			 u32 type, u32 mask);
104 
105 static inline void crypto_drop_skcipher(struct crypto_skcipher_spawn *spawn)
106 {
107 	crypto_drop_spawn(&spawn->base);
108 }
109 
110 static inline struct skcipher_alg *crypto_skcipher_spawn_alg(
111 	struct crypto_skcipher_spawn *spawn)
112 {
113 	return container_of(spawn->base.alg, struct skcipher_alg, base);
114 }
115 
116 static inline struct skcipher_alg *crypto_spawn_skcipher_alg(
117 	struct crypto_skcipher_spawn *spawn)
118 {
119 	return crypto_skcipher_spawn_alg(spawn);
120 }
121 
122 static inline struct crypto_skcipher *crypto_spawn_skcipher(
123 	struct crypto_skcipher_spawn *spawn)
124 {
125 	return crypto_spawn_tfm2(&spawn->base);
126 }
127 
128 static inline void crypto_skcipher_set_reqsize(
129 	struct crypto_skcipher *skcipher, unsigned int reqsize)
130 {
131 	skcipher->reqsize = reqsize;
132 }
133 
134 int crypto_register_skcipher(struct skcipher_alg *alg);
135 void crypto_unregister_skcipher(struct skcipher_alg *alg);
136 int crypto_register_skciphers(struct skcipher_alg *algs, int count);
137 void crypto_unregister_skciphers(struct skcipher_alg *algs, int count);
138 int skcipher_register_instance(struct crypto_template *tmpl,
139 			       struct skcipher_instance *inst);
140 
141 int skcipher_walk_done(struct skcipher_walk *walk, int err);
142 int skcipher_walk_virt(struct skcipher_walk *walk,
143 		       struct skcipher_request *req,
144 		       bool atomic);
145 void skcipher_walk_atomise(struct skcipher_walk *walk);
146 int skcipher_walk_async(struct skcipher_walk *walk,
147 			struct skcipher_request *req);
148 int skcipher_walk_aead(struct skcipher_walk *walk, struct aead_request *req,
149 		       bool atomic);
150 int skcipher_walk_aead_encrypt(struct skcipher_walk *walk,
151 			       struct aead_request *req, bool atomic);
152 int skcipher_walk_aead_decrypt(struct skcipher_walk *walk,
153 			       struct aead_request *req, bool atomic);
154 void skcipher_walk_complete(struct skcipher_walk *walk, int err);
155 
156 static inline void ablkcipher_request_complete(struct ablkcipher_request *req,
157 					       int err)
158 {
159 	req->base.complete(&req->base, err);
160 }
161 
162 static inline u32 ablkcipher_request_flags(struct ablkcipher_request *req)
163 {
164 	return req->base.flags;
165 }
166 
167 static inline void *crypto_skcipher_ctx(struct crypto_skcipher *tfm)
168 {
169 	return crypto_tfm_ctx(&tfm->base);
170 }
171 
172 static inline void *skcipher_request_ctx(struct skcipher_request *req)
173 {
174 	return req->__ctx;
175 }
176 
177 static inline u32 skcipher_request_flags(struct skcipher_request *req)
178 {
179 	return req->base.flags;
180 }
181 
182 static inline unsigned int crypto_skcipher_alg_min_keysize(
183 	struct skcipher_alg *alg)
184 {
185 	if ((alg->base.cra_flags & CRYPTO_ALG_TYPE_MASK) ==
186 	    CRYPTO_ALG_TYPE_BLKCIPHER)
187 		return alg->base.cra_blkcipher.min_keysize;
188 
189 	if (alg->base.cra_ablkcipher.encrypt)
190 		return alg->base.cra_ablkcipher.min_keysize;
191 
192 	return alg->min_keysize;
193 }
194 
195 static inline unsigned int crypto_skcipher_alg_max_keysize(
196 	struct skcipher_alg *alg)
197 {
198 	if ((alg->base.cra_flags & CRYPTO_ALG_TYPE_MASK) ==
199 	    CRYPTO_ALG_TYPE_BLKCIPHER)
200 		return alg->base.cra_blkcipher.max_keysize;
201 
202 	if (alg->base.cra_ablkcipher.encrypt)
203 		return alg->base.cra_ablkcipher.max_keysize;
204 
205 	return alg->max_keysize;
206 }
207 
208 /* Helpers for simple block cipher modes of operation */
209 struct skcipher_ctx_simple {
210 	struct crypto_cipher *cipher;	/* underlying block cipher */
211 };
212 static inline struct crypto_cipher *
213 skcipher_cipher_simple(struct crypto_skcipher *tfm)
214 {
215 	struct skcipher_ctx_simple *ctx = crypto_skcipher_ctx(tfm);
216 
217 	return ctx->cipher;
218 }
219 struct skcipher_instance *
220 skcipher_alloc_instance_simple(struct crypto_template *tmpl, struct rtattr **tb,
221 			       struct crypto_alg **cipher_alg_ret);
222 
223 #endif	/* _CRYPTO_INTERNAL_SKCIPHER_H */
224 
225