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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Hash: Hash algorithms under the crypto API
*
* Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
*/
#ifndef _CRYPTO_HASH_H
#define _CRYPTO_HASH_H
#include <linux/crypto.h>
#include <linux/string.h>
struct crypto_ahash;
/**
* DOC: Message Digest Algorithm Definitions
*
* These data structures define modular message digest algorithm
* implementations, managed via crypto_register_ahash(),
* crypto_register_shash(), crypto_unregister_ahash() and
* crypto_unregister_shash().
*/
/**
* struct hash_alg_common - define properties of message digest
* @digestsize: Size of the result of the transformation. A buffer of this size
* must be available to the @final and @finup calls, so they can
* store the resulting hash into it. For various predefined sizes,
* search include/crypto/ using
* git grep _DIGEST_SIZE include/crypto.
* @statesize: Size of the block for partial state of the transformation. A
* buffer of this size must be passed to the @export function as it
* will save the partial state of the transformation into it. On the
* other side, the @import function will load the state from a
* buffer of this size as well.
* @base: Start of data structure of cipher algorithm. The common data
* structure of crypto_alg contains information common to all ciphers.
* The hash_alg_common data structure now adds the hash-specific
* information.
*/
struct hash_alg_common {
unsigned int digestsize;
unsigned int statesize;
struct crypto_alg base;
};
struct ahash_request {
struct crypto_async_request base;
unsigned int nbytes;
struct scatterlist *src;
u8 *result;
/* This field may only be used by the ahash API code. */
void *priv;
void *__ctx[] CRYPTO_MINALIGN_ATTR;
};
#define AHASH_REQUEST_ON_STACK(name, ahash) \
char __##name##_desc[sizeof(struct ahash_request) + \
crypto_ahash_reqsize(ahash)] CRYPTO_MINALIGN_ATTR; \
struct ahash_request *name = (void *)__##name##_desc
/**
* struct ahash_alg - asynchronous message digest definition
* @init: **[mandatory]** Initialize the transformation context. Intended only to initialize the
* state of the HASH transformation at the beginning. This shall fill in
* the internal structures used during the entire duration of the whole
* transformation. No data processing happens at this point. Driver code
* implementation must not use req->result.
* @update: **[mandatory]** Push a chunk of data into the driver for transformation. This
* function actually pushes blocks of data from upper layers into the
* driver, which then passes those to the hardware as seen fit. This
* function must not finalize the HASH transformation by calculating the
* final message digest as this only adds more data into the
* transformation. This function shall not modify the transformation
* context, as this function may be called in parallel with the same
* transformation object. Data processing can happen synchronously
* [SHASH] or asynchronously [AHASH] at this point. Driver must not use
* req->result.
* @final: **[mandatory]** Retrieve result from the driver. This function finalizes the
* transformation and retrieves the resulting hash from the driver and
* pushes it back to upper layers. No data processing happens at this
* point unless hardware requires it to finish the transformation
* (then the data buffered by the device driver is processed).
* @finup: **[optional]** Combination of @update and @final. This function is effectively a
* combination of @update and @final calls issued in sequence. As some
* hardware cannot do @update and @final separately, this callback was
* added to allow such hardware to be used at least by IPsec. Data
* processing can happen synchronously [SHASH] or asynchronously [AHASH]
* at this point.
* @digest: Combination of @init and @update and @final. This function
* effectively behaves as the entire chain of operations, @init,
* @update and @final issued in sequence. Just like @finup, this was
* added for hardware which cannot do even the @finup, but can only do
* the whole transformation in one run. Data processing can happen
* synchronously [SHASH] or asynchronously [AHASH] at this point.
* @setkey: Set optional key used by the hashing algorithm. Intended to push
* optional key used by the hashing algorithm from upper layers into
* the driver. This function can store the key in the transformation
* context or can outright program it into the hardware. In the former
* case, one must be careful to program the key into the hardware at
* appropriate time and one must be careful that .setkey() can be
* called multiple times during the existence of the transformation
* object. Not all hashing algorithms do implement this function as it
* is only needed for keyed message digests. SHAx/MDx/CRCx do NOT
* implement this function. HMAC(MDx)/HMAC(SHAx)/CMAC(AES) do implement
* this function. This function must be called before any other of the
* @init, @update, @final, @finup, @digest is called. No data
* processing happens at this point.
* @export: Export partial state of the transformation. This function dumps the
* entire state of the ongoing transformation into a provided block of
* data so it can be @import 'ed back later on. This is useful in case
* you want to save partial result of the transformation after
* processing certain amount of data and reload this partial result
* multiple times later on for multiple re-use. No data processing
* happens at this point. Driver must not use req->result.
* @import: Import partial state of the transformation. This function loads the
* entire state of the ongoing transformation from a provided block of
* data so the transformation can continue from this point onward. No
* data processing happens at this point. Driver must not use
* req->result.
* @halg: see struct hash_alg_common
*/
struct ahash_alg {
int (*init)(struct ahash_request *req);
int (*update)(struct ahash_request *req);
int (*final)(struct ahash_request *req);
int (*finup)(struct ahash_request *req);
int (*digest)(struct ahash_request *req);
int (*export)(struct ahash_request *req, void *out);
int (*import)(struct ahash_request *req, const void *in);
int (*setkey)(struct crypto_ahash *tfm, const u8 *key,
unsigned int keylen);
struct hash_alg_common halg;
};
struct shash_desc {
struct crypto_shash *tfm;
void *__ctx[] CRYPTO_MINALIGN_ATTR;
};
#define HASH_MAX_DIGESTSIZE 64
/*
* Worst case is hmac(sha3-224-generic). Its context is a nested 'shash_desc'
* containing a 'struct sha3_state'.
*/
#define HASH_MAX_DESCSIZE (sizeof(struct shash_desc) + 360)
#define HASH_MAX_STATESIZE 512
#define SHASH_DESC_ON_STACK(shash, ctx) \
char __##shash##_desc[sizeof(struct shash_desc) + \
HASH_MAX_DESCSIZE] CRYPTO_MINALIGN_ATTR; \
struct shash_desc *shash = (struct shash_desc *)__##shash##_desc
/**
* struct shash_alg - synchronous message digest definition
* @init: see struct ahash_alg
* @update: see struct ahash_alg
* @final: see struct ahash_alg
* @finup: see struct ahash_alg
* @digest: see struct ahash_alg
* @export: see struct ahash_alg
* @import: see struct ahash_alg
* @setkey: see struct ahash_alg
* @init_tfm: Initialize the cryptographic transformation object.
* This function is called only once at the instantiation
* time, right after the transformation context was
* allocated. In case the cryptographic hardware has
* some special requirements which need to be handled
* by software, this function shall check for the precise
* requirement of the transformation and put any software
* fallbacks in place.
* @exit_tfm: Deinitialize the cryptographic transformation object.
* This is a counterpart to @init_tfm, used to remove
* various changes set in @init_tfm.
* @digestsize: see struct ahash_alg
* @statesize: see struct ahash_alg
* @descsize: Size of the operational state for the message digest. This state
* size is the memory size that needs to be allocated for
* shash_desc.__ctx
* @base: internally used
*/
struct shash_alg {
int (*init)(struct shash_desc *desc);
int (*update)(struct shash_desc *desc, const u8 *data,
unsigned int len);
int (*final)(struct shash_desc *desc, u8 *out);
int (*finup)(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out);
int (*digest)(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out);
int (*export)(struct shash_desc *desc, void *out);
int (*import)(struct shash_desc *desc, const void *in);
int (*setkey)(struct crypto_shash *tfm, const u8 *key,
unsigned int keylen);
int (*init_tfm)(struct crypto_shash *tfm);
void (*exit_tfm)(struct crypto_shash *
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