7b5a080b3c
The shash interface replaces the current synchronous hash interface. It improves over hash in two ways. Firstly shash is reentrant, meaning that the same tfm may be used by two threads simultaneously as all hashing state is stored in a local descriptor. The other enhancement is that shash no longer takes scatter list entries. This is because shash is specifically designed for synchronous algorithms and as such scatter lists are unnecessary. All existing hash users will be converted to shash once the algorithms have been completely converted. There is also a new finup function that combines update with final. This will be extended to ahash once the algorithm conversion is done. This is also the first time that an algorithm type has their own registration function. Existing algorithm types will be converted to this way in due course. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
276 lines
6.7 KiB
C
276 lines
6.7 KiB
C
/*
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* Hash: Hash algorithms under the crypto API
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*
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* Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#ifndef _CRYPTO_HASH_H
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#define _CRYPTO_HASH_H
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#include <linux/crypto.h>
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struct shash_desc {
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struct crypto_shash *tfm;
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u32 flags;
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void *__ctx[] CRYPTO_MINALIGN_ATTR;
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};
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struct shash_alg {
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int (*init)(struct shash_desc *desc);
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int (*update)(struct shash_desc *desc, const u8 *data,
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unsigned int len);
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int (*final)(struct shash_desc *desc, u8 *out);
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int (*finup)(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out);
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int (*digest)(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out);
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int (*setkey)(struct crypto_shash *tfm, const u8 *key,
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unsigned int keylen);
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unsigned int descsize;
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unsigned int digestsize;
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struct crypto_alg base;
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};
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struct crypto_ahash {
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struct crypto_tfm base;
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};
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struct crypto_shash {
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struct crypto_tfm base;
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};
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static inline struct crypto_ahash *__crypto_ahash_cast(struct crypto_tfm *tfm)
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{
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return (struct crypto_ahash *)tfm;
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}
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static inline struct crypto_ahash *crypto_alloc_ahash(const char *alg_name,
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u32 type, u32 mask)
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{
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type &= ~CRYPTO_ALG_TYPE_MASK;
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mask &= ~CRYPTO_ALG_TYPE_MASK;
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type |= CRYPTO_ALG_TYPE_AHASH;
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mask |= CRYPTO_ALG_TYPE_AHASH_MASK;
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return __crypto_ahash_cast(crypto_alloc_base(alg_name, type, mask));
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}
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static inline struct crypto_tfm *crypto_ahash_tfm(struct crypto_ahash *tfm)
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{
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return &tfm->base;
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}
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static inline void crypto_free_ahash(struct crypto_ahash *tfm)
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{
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crypto_free_tfm(crypto_ahash_tfm(tfm));
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}
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static inline unsigned int crypto_ahash_alignmask(
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struct crypto_ahash *tfm)
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{
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return crypto_tfm_alg_alignmask(crypto_ahash_tfm(tfm));
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}
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static inline struct ahash_tfm *crypto_ahash_crt(struct crypto_ahash *tfm)
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{
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return &crypto_ahash_tfm(tfm)->crt_ahash;
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}
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static inline unsigned int crypto_ahash_digestsize(struct crypto_ahash *tfm)
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{
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return crypto_ahash_crt(tfm)->digestsize;
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}
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static inline u32 crypto_ahash_get_flags(struct crypto_ahash *tfm)
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{
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return crypto_tfm_get_flags(crypto_ahash_tfm(tfm));
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}
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static inline void crypto_ahash_set_flags(struct crypto_ahash *tfm, u32 flags)
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{
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crypto_tfm_set_flags(crypto_ahash_tfm(tfm), flags);
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}
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static inline void crypto_ahash_clear_flags(struct crypto_ahash *tfm, u32 flags)
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{
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crypto_tfm_clear_flags(crypto_ahash_tfm(tfm), flags);
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}
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static inline struct crypto_ahash *crypto_ahash_reqtfm(
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struct ahash_request *req)
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{
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return __crypto_ahash_cast(req->base.tfm);
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}
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static inline unsigned int crypto_ahash_reqsize(struct crypto_ahash *tfm)
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{
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return crypto_ahash_crt(tfm)->reqsize;
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}
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static inline int crypto_ahash_setkey(struct crypto_ahash *tfm,
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const u8 *key, unsigned int keylen)
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{
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struct ahash_tfm *crt = crypto_ahash_crt(tfm);
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return crt->setkey(tfm, key, keylen);
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}
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static inline int crypto_ahash_digest(struct ahash_request *req)
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{
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struct ahash_tfm *crt = crypto_ahash_crt(crypto_ahash_reqtfm(req));
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return crt->digest(req);
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}
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static inline int crypto_ahash_init(struct ahash_request *req)
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{
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struct ahash_tfm *crt = crypto_ahash_crt(crypto_ahash_reqtfm(req));
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return crt->init(req);
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}
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static inline int crypto_ahash_update(struct ahash_request *req)
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{
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struct ahash_tfm *crt = crypto_ahash_crt(crypto_ahash_reqtfm(req));
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return crt->update(req);
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}
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static inline int crypto_ahash_final(struct ahash_request *req)
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{
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struct ahash_tfm *crt = crypto_ahash_crt(crypto_ahash_reqtfm(req));
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return crt->final(req);
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}
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static inline void ahash_request_set_tfm(struct ahash_request *req,
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struct crypto_ahash *tfm)
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{
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req->base.tfm = crypto_ahash_tfm(tfm);
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}
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static inline struct ahash_request *ahash_request_alloc(
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struct crypto_ahash *tfm, gfp_t gfp)
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{
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struct ahash_request *req;
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req = kmalloc(sizeof(struct ahash_request) +
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crypto_ahash_reqsize(tfm), gfp);
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if (likely(req))
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ahash_request_set_tfm(req, tfm);
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return req;
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}
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static inline void ahash_request_free(struct ahash_request *req)
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{
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kfree(req);
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}
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static inline struct ahash_request *ahash_request_cast(
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struct crypto_async_request *req)
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{
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return container_of(req, struct ahash_request, base);
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}
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static inline void ahash_request_set_callback(struct ahash_request *req,
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u32 flags,
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crypto_completion_t complete,
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void *data)
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{
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req->base.complete = complete;
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req->base.data = data;
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req->base.flags = flags;
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}
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static inline void ahash_request_set_crypt(struct ahash_request *req,
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struct scatterlist *src, u8 *result,
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unsigned int nbytes)
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{
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req->src = src;
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req->nbytes = nbytes;
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req->result = result;
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}
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struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
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u32 mask);
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static inline struct crypto_tfm *crypto_shash_tfm(struct crypto_shash *tfm)
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{
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return &tfm->base;
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}
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static inline void crypto_free_shash(struct crypto_shash *tfm)
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{
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crypto_free_tfm(crypto_shash_tfm(tfm));
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}
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static inline unsigned int crypto_shash_alignmask(
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struct crypto_shash *tfm)
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{
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return crypto_tfm_alg_alignmask(crypto_shash_tfm(tfm));
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}
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static inline struct shash_alg *__crypto_shash_alg(struct crypto_alg *alg)
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{
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return container_of(alg, struct shash_alg, base);
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}
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static inline struct shash_alg *crypto_shash_alg(struct crypto_shash *tfm)
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{
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return __crypto_shash_alg(crypto_shash_tfm(tfm)->__crt_alg);
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}
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static inline unsigned int crypto_shash_digestsize(struct crypto_shash *tfm)
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{
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return crypto_shash_alg(tfm)->digestsize;
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}
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static inline u32 crypto_shash_get_flags(struct crypto_shash *tfm)
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{
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return crypto_tfm_get_flags(crypto_shash_tfm(tfm));
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}
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static inline void crypto_shash_set_flags(struct crypto_shash *tfm, u32 flags)
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{
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crypto_tfm_set_flags(crypto_shash_tfm(tfm), flags);
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}
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static inline void crypto_shash_clear_flags(struct crypto_shash *tfm, u32 flags)
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{
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crypto_tfm_clear_flags(crypto_shash_tfm(tfm), flags);
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}
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static inline unsigned int crypto_shash_descsize(struct crypto_shash *tfm)
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{
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return crypto_shash_alg(tfm)->descsize;
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}
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static inline void *shash_desc_ctx(struct shash_desc *desc)
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{
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return desc->__ctx;
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}
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int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
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unsigned int keylen);
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int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out);
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static inline int crypto_shash_init(struct shash_desc *desc)
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{
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return crypto_shash_alg(desc->tfm)->init(desc);
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}
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int crypto_shash_update(struct shash_desc *desc, const u8 *data,
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unsigned int len);
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int crypto_shash_final(struct shash_desc *desc, u8 *out);
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int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out);
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#endif /* _CRYPTO_HASH_H */
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