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* Cryptographic API for algorithms (i.e., low-level API).
* Copyright (c) 2006 Herbert Xu <>
* 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.
#include <linux/crypto.h>
struct module;
struct seq_file;
struct crypto_type {
unsigned int (*ctxsize)(struct crypto_alg *alg);
int (*init)(struct crypto_tfm *tfm);
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;
struct crypto_template {
struct list_head list;
struct hlist_head instances;
struct module *module;
struct crypto_instance *(*alloc)(void *param, unsigned int len);
void (*free)(struct crypto_instance *inst);
struct crypto_spawn {
struct list_head list;
struct crypto_alg *alg;
struct crypto_instance *inst;
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;
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);
void crypto_drop_spawn(struct crypto_spawn *spawn);
struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn);
struct crypto_alg *crypto_get_attr_alg(void *param, unsigned int len,
u32 type, u32 mask);
struct crypto_instance *crypto_alloc_instance(const char *name,
struct crypto_alg *alg);
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);
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 void *crypto_instance_ctx(struct crypto_instance *inst)
return inst->__ctx;
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 cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
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-> = src;
walk-> = dst;
walk->total = nbytes;
#endif /* _CRYPTO_ALGAPI_H */