1 /* 2 * Cryptographic API for algorithms (i.e., low-level API). 3 * 4 * Copyright (c) 2006 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 #ifndef _CRYPTO_ALGAPI_H 13 #define _CRYPTO_ALGAPI_H 14 15 #include <linux/crypto.h> 16 #include <linux/list.h> 17 #include <linux/kernel.h> 18 19 struct module; 20 struct rtattr; 21 struct seq_file; 22 23 struct crypto_type { 24 unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask); 25 int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask); 26 void (*exit)(struct crypto_tfm *tfm); 27 void (*show)(struct seq_file *m, struct crypto_alg *alg); 28 }; 29 30 struct crypto_instance { 31 struct crypto_alg alg; 32 33 struct crypto_template *tmpl; 34 struct hlist_node list; 35 36 void *__ctx[] CRYPTO_MINALIGN_ATTR; 37 }; 38 39 struct crypto_template { 40 struct list_head list; 41 struct hlist_head instances; 42 struct module *module; 43 44 struct crypto_instance *(*alloc)(struct rtattr **tb); 45 void (*free)(struct crypto_instance *inst); 46 47 char name[CRYPTO_MAX_ALG_NAME]; 48 }; 49 50 struct crypto_spawn { 51 struct list_head list; 52 struct crypto_alg *alg; 53 struct crypto_instance *inst; 54 u32 mask; 55 }; 56 57 struct crypto_queue { 58 struct list_head list; 59 struct list_head *backlog; 60 61 unsigned int qlen; 62 unsigned int max_qlen; 63 }; 64 65 struct scatter_walk { 66 struct scatterlist *sg; 67 unsigned int offset; 68 }; 69 70 struct blkcipher_walk { 71 union { 72 struct { 73 struct page *page; 74 unsigned long offset; 75 } phys; 76 77 struct { 78 u8 *page; 79 u8 *addr; 80 } virt; 81 } src, dst; 82 83 struct scatter_walk in; 84 unsigned int nbytes; 85 86 struct scatter_walk out; 87 unsigned int total; 88 89 void *page; 90 u8 *buffer; 91 u8 *iv; 92 93 int flags; 94 }; 95 96 extern const struct crypto_type crypto_ablkcipher_type; 97 extern const struct crypto_type crypto_blkcipher_type; 98 extern const struct crypto_type crypto_hash_type; 99 100 void crypto_mod_put(struct crypto_alg *alg); 101 102 int crypto_register_template(struct crypto_template *tmpl); 103 void crypto_unregister_template(struct crypto_template *tmpl); 104 struct crypto_template *crypto_lookup_template(const char *name); 105 106 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, 107 struct crypto_instance *inst, u32 mask); 108 void crypto_drop_spawn(struct crypto_spawn *spawn); 109 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, 110 u32 mask); 111 112 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb); 113 int crypto_check_attr_type(struct rtattr **tb, u32 type); 114 struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb, u32 type, u32 mask); 115 struct crypto_instance *crypto_alloc_instance(const char *name, 116 struct crypto_alg *alg); 117 118 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen); 119 int crypto_enqueue_request(struct crypto_queue *queue, 120 struct crypto_async_request *request); 121 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue); 122 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm); 123 124 int blkcipher_walk_done(struct blkcipher_desc *desc, 125 struct blkcipher_walk *walk, int err); 126 int blkcipher_walk_virt(struct blkcipher_desc *desc, 127 struct blkcipher_walk *walk); 128 int blkcipher_walk_phys(struct blkcipher_desc *desc, 129 struct blkcipher_walk *walk); 130 131 static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm) 132 { 133 unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm); 134 unsigned long align = crypto_tfm_alg_alignmask(tfm); 135 136 if (align <= crypto_tfm_ctx_alignment()) 137 align = 1; 138 return (void *)ALIGN(addr, align); 139 } 140 141 static inline struct crypto_instance *crypto_tfm_alg_instance( 142 struct crypto_tfm *tfm) 143 { 144 return container_of(tfm->__crt_alg, struct crypto_instance, alg); 145 } 146 147 static inline void *crypto_instance_ctx(struct crypto_instance *inst) 148 { 149 return inst->__ctx; 150 } 151 152 static inline struct ablkcipher_alg *crypto_ablkcipher_alg( 153 struct crypto_ablkcipher *tfm) 154 { 155 return &crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_ablkcipher; 156 } 157 158 static inline void *crypto_ablkcipher_ctx(struct crypto_ablkcipher *tfm) 159 { 160 return crypto_tfm_ctx(&tfm->base); 161 } 162 163 static inline struct crypto_blkcipher *crypto_spawn_blkcipher( 164 struct crypto_spawn *spawn) 165 { 166 u32 type = CRYPTO_ALG_TYPE_BLKCIPHER; 167 u32 mask = CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC; 168 169 return __crypto_blkcipher_cast(crypto_spawn_tfm(spawn, type, mask)); 170 } 171 172 static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm) 173 { 174 return crypto_tfm_ctx(&tfm->base); 175 } 176 177 static inline void *crypto_blkcipher_ctx_aligned(struct crypto_blkcipher *tfm) 178 { 179 return crypto_tfm_ctx_aligned(&tfm->base); 180 } 181 182 static inline struct crypto_cipher *crypto_spawn_cipher( 183 struct crypto_spawn *spawn) 184 { 185 u32 type = CRYPTO_ALG_TYPE_CIPHER; 186 u32 mask = CRYPTO_ALG_TYPE_MASK; 187 188 return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask)); 189 } 190 191 static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm) 192 { 193 return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher; 194 } 195 196 static inline struct crypto_hash *crypto_spawn_hash(struct crypto_spawn *spawn) 197 { 198 u32 type = CRYPTO_ALG_TYPE_HASH; 199 u32 mask = CRYPTO_ALG_TYPE_HASH_MASK; 200 201 return __crypto_hash_cast(crypto_spawn_tfm(spawn, type, mask)); 202 } 203 204 static inline void *crypto_hash_ctx_aligned(struct crypto_hash *tfm) 205 { 206 return crypto_tfm_ctx_aligned(&tfm->base); 207 } 208 209 static inline void blkcipher_walk_init(struct blkcipher_walk *walk, 210 struct scatterlist *dst, 211 struct scatterlist *src, 212 unsigned int nbytes) 213 { 214 walk->in.sg = src; 215 walk->out.sg = dst; 216 walk->total = nbytes; 217 } 218 219 static inline struct crypto_async_request *crypto_get_backlog( 220 struct crypto_queue *queue) 221 { 222 return queue->backlog == &queue->list ? NULL : 223 container_of(queue->backlog, struct crypto_async_request, list); 224 } 225 226 static inline int ablkcipher_enqueue_request(struct ablkcipher_alg *alg, 227 struct ablkcipher_request *request) 228 { 229 return crypto_enqueue_request(alg->queue, &request->base); 230 } 231 232 static inline struct ablkcipher_request *ablkcipher_dequeue_request( 233 struct ablkcipher_alg *alg) 234 { 235 return ablkcipher_request_cast(crypto_dequeue_request(alg->queue)); 236 } 237 238 static inline void *ablkcipher_request_ctx(struct ablkcipher_request *req) 239 { 240 return req->__ctx; 241 } 242 243 static inline int ablkcipher_tfm_in_queue(struct crypto_ablkcipher *tfm) 244 { 245 return crypto_tfm_in_queue(crypto_ablkcipher_alg(tfm)->queue, 246 crypto_ablkcipher_tfm(tfm)); 247 } 248 249 #endif /* _CRYPTO_ALGAPI_H */ 250 251