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/*

 * Cryptographic API for algorithms (i.e., low-level API).

 *

 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License as published by the Free

 * Software Foundation; either version 2 of the License, or (at your option)

 * any later version.

 *

 */

#ifndef _CRYPTO_ALGAPI_H

#define _CRYPTO_ALGAPI_H

#include <linux/crypto.h>

#include <linux/list.h>

#include <linux/kernel.h>

struct module;

struct rtattr;

struct seq_file;

struct crypto_type {

        unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);

        int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask);

        void (*exit)(struct crypto_tfm *tfm);

        void (*show)(struct seq_file *m, struct crypto_alg *alg);

};

struct crypto_instance {

        struct crypto_alg alg;

        struct crypto_template *tmpl;

        struct hlist_node list;

        void *__ctx[] CRYPTO_MINALIGN_ATTR;

};

struct crypto_template {

        struct list_head list;

        struct hlist_head instances;

        struct module *module;

        struct crypto_instance *(*alloc)(struct rtattr **tb);

        void (*free)(struct crypto_instance *inst);

        char name[CRYPTO_MAX_ALG_NAME];

};

struct crypto_spawn {

        struct list_head list;

        struct crypto_alg *alg;

        struct crypto_instance *inst;

        u32 mask;

};

struct crypto_queue {

        struct list_head list;

        struct list_head *backlog;

        unsigned int qlen;

        unsigned int max_qlen;

};

struct scatter_walk {

        struct scatterlist *sg;

        unsigned int offset;

};

struct blkcipher_walk {

        union {

                struct {

                        struct page *page;

                        unsigned long offset;

                } phys;

                struct {

                        u8 *page;

                        u8 *addr;

                } virt;

        } src, dst;

        struct scatter_walk in;

        unsigned int nbytes;

        struct scatter_walk out;

        unsigned int total;

        void *page;

        u8 *buffer;

        u8 *iv;

        int flags;

        unsigned int blocksize;

};

extern const struct crypto_type crypto_ablkcipher_type;

extern const struct crypto_type crypto_aead_type;

extern const struct crypto_type crypto_blkcipher_type;

extern const struct crypto_type crypto_hash_type;

void crypto_mod_put(struct crypto_alg *alg);

int crypto_register_template(struct crypto_template *tmpl);

void crypto_unregister_template(struct crypto_template *tmpl);

struct crypto_template *crypto_lookup_template(const char *name);

int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,

                      struct crypto_instance *inst, u32 mask);

void crypto_drop_spawn(struct crypto_spawn *spawn);

struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,

                                    u32 mask);

struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);

int crypto_check_attr_type(struct rtattr **tb, u32 type);

struct crypto_alg *crypto_attr_alg(struct rtattr *rta, u32 type, u32 mask);

int crypto_attr_u32(struct rtattr *rta, u32 *num);

struct crypto_instance *crypto_alloc_instance(const char *name,

                                              struct crypto_alg *alg);

void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen);

int crypto_enqueue_request(struct crypto_queue *queue,

                           struct crypto_async_request *request);

struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);

int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm);

int blkcipher_walk_done(struct blkcipher_desc *desc,

                        struct blkcipher_walk *walk, int err);

int blkcipher_walk_virt(struct blkcipher_desc *desc,

                        struct blkcipher_walk *walk);

int blkcipher_walk_phys(struct blkcipher_desc *desc,

                        struct blkcipher_walk *walk);

int blkcipher_walk_virt_block(struct blkcipher_desc *desc,

                              struct blkcipher_walk *walk,

                              unsigned int blocksize);

static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)

{

        unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);

        unsigned long align = crypto_tfm_alg_alignmask(tfm);

        if (align <= crypto_tfm_ctx_alignment())

                align = 1;

        return (void *)ALIGN(addr, align);

}

static inline struct crypto_instance *crypto_tfm_alg_instance(

        struct crypto_tfm *tfm)

{

        return container_of(tfm->__crt_alg, struct crypto_instance, alg);

}

static inline void *crypto_instance_ctx(struct crypto_instance *inst)

{

        return inst->__ctx;

}

static inline struct ablkcipher_alg *crypto_ablkcipher_alg(

        struct crypto_ablkcipher *tfm)

{

        return &crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_ablkcipher;

}

static inline void *crypto_ablkcipher_ctx(struct crypto_ablkcipher *tfm)

{

        return crypto_tfm_ctx(&tfm->base);

}

static inline void *crypto_ablkcipher_ctx_aligned(struct crypto_ablkcipher *tfm)

{

        return crypto_tfm_ctx_aligned(&tfm->base);

}

static inline struct aead_alg *crypto_aead_alg(struct crypto_aead *tfm)

{

        return &crypto_aead_tfm(tfm)->__crt_alg->cra_aead;

}

static inline void *crypto_aead_ctx(struct crypto_aead *tfm)

{

        return crypto_tfm_ctx(&tfm->base);

}

static inline struct crypto_instance *crypto_aead_alg_instance(

        struct crypto_aead *aead)

{

        return crypto_tfm_alg_instance(&aead->base);

}

static inline struct crypto_ablkcipher *crypto_spawn_ablkcipher(

        struct crypto_spawn *spawn)

{

        u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;

        u32 mask = CRYPTO_ALG_TYPE_MASK;

        return __crypto_ablkcipher_cast(crypto_spawn_tfm(spawn, type, mask));

}

static inline struct crypto_blkcipher *crypto_spawn_blkcipher(

        struct crypto_spawn *spawn)

{

        u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;

        u32 mask = CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC;

        return __crypto_blkcipher_cast(crypto_spawn_tfm(spawn, type, mask));

}

static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm)

{

        return crypto_tfm_ctx(&tfm->base);

}

static inline void *crypto_blkcipher_ctx_aligned(struct crypto_blkcipher *tfm)

{

        return crypto_tfm_ctx_aligned(&tfm->base);

}

static inline struct crypto_cipher *crypto_spawn_cipher(

        struct crypto_spawn *spawn)

{

        u32 type = CRYPTO_ALG_TYPE_CIPHER;

        u32 mask = CRYPTO_ALG_TYPE_MASK;

        return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask));

}

static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)

{

        return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;

}

static inline struct crypto_hash *crypto_spawn_hash(struct crypto_spawn *spawn)

{

        u32 type = CRYPTO_ALG_TYPE_HASH;

        u32 mask = CRYPTO_ALG_TYPE_HASH_MASK;

        return __crypto_hash_cast(crypto_spawn_tfm(spawn, type, mask));

}

static inline void *crypto_hash_ctx_aligned(struct crypto_hash *tfm)

{

        return crypto_tfm_ctx_aligned(&tfm->base);

}

static inline void blkcipher_walk_init(struct blkcipher_walk *walk,

                                       struct scatterlist *dst,

                                       struct scatterlist *src,

                                       unsigned int nbytes)

{

        walk->in.sg = src;

        walk->out.sg = dst;

        walk->total = nbytes;

}

static inline struct crypto_async_request *crypto_get_backlog(

        struct crypto_queue *queue)

{

        return queue->backlog == &queue->list ? NULL :

               container_of(queue->backlog, struct crypto_async_request, list);

}

static inline int ablkcipher_enqueue_request(struct crypto_queue *queue,

                                             struct ablkcipher_request *request)

{

        return crypto_enqueue_request(queue, &request->base);

}

static inline struct ablkcipher_request *ablkcipher_dequeue_request(

        struct crypto_queue *queue)

{

        return ablkcipher_request_cast(crypto_dequeue_request(queue));

}

static inline void *ablkcipher_request_ctx(struct ablkcipher_request *req)

{

        return req->__ctx;

}

static inline int ablkcipher_tfm_in_queue(struct crypto_queue *queue,

                                          struct crypto_ablkcipher *tfm)

{

        return crypto_tfm_in_queue(queue, crypto_ablkcipher_tfm(tfm));

}

static inline void *aead_request_ctx(struct aead_request *req)

{

        return req->__ctx;

}

static inline void aead_request_complete(struct aead_request *req, int err)

{

        req->base.complete(&req->base, err);

}

static inline u32 aead_request_flags(struct aead_request *req)

{

        return req->base.flags;

}

static inline struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb,

                                                     u32 type, u32 mask)

{

        return crypto_attr_alg(tb[1], type, mask);

}

#endif  /* _CRYPTO_ALGAPI_H */