1006 lines
34 KiB
C
1006 lines
34 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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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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#ifndef _CRYPTO_HASH_H
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#define _CRYPTO_HASH_H
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#include <linux/crypto.h>
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#include <linux/string.h>
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struct crypto_ahash;
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/**
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* DOC: Message Digest Algorithm Definitions
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*
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* These data structures define modular message digest algorithm
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* implementations, managed via crypto_register_ahash(),
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* crypto_register_shash(), crypto_unregister_ahash() and
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* crypto_unregister_shash().
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*/
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/**
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* struct hash_alg_common - define properties of message digest
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* @digestsize: Size of the result of the transformation. A buffer of this size
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* must be available to the @final and @finup calls, so they can
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* store the resulting hash into it. For various predefined sizes,
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* search include/crypto/ using
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* git grep _DIGEST_SIZE include/crypto.
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* @statesize: Size of the block for partial state of the transformation. A
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* buffer of this size must be passed to the @export function as it
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* will save the partial state of the transformation into it. On the
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* other side, the @import function will load the state from a
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* buffer of this size as well.
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* @base: Start of data structure of cipher algorithm. The common data
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* structure of crypto_alg contains information common to all ciphers.
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* The hash_alg_common data structure now adds the hash-specific
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* information.
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*/
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struct hash_alg_common {
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unsigned int digestsize;
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unsigned int statesize;
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struct crypto_alg base;
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};
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struct ahash_request {
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struct crypto_async_request base;
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unsigned int nbytes;
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struct scatterlist *src;
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u8 *result;
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/* This field may only be used by the ahash API code. */
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void *priv;
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void *__ctx[] CRYPTO_MINALIGN_ATTR;
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};
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/**
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* struct ahash_alg - asynchronous message digest definition
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* @init: **[mandatory]** Initialize the transformation context. Intended only to initialize the
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* state of the HASH transformation at the beginning. This shall fill in
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* the internal structures used during the entire duration of the whole
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* transformation. No data processing happens at this point. Driver code
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* implementation must not use req->result.
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* @update: **[mandatory]** Push a chunk of data into the driver for transformation. This
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* function actually pushes blocks of data from upper layers into the
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* driver, which then passes those to the hardware as seen fit. This
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* function must not finalize the HASH transformation by calculating the
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* final message digest as this only adds more data into the
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* transformation. This function shall not modify the transformation
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* context, as this function may be called in parallel with the same
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* transformation object. Data processing can happen synchronously
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* [SHASH] or asynchronously [AHASH] at this point. Driver must not use
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* req->result.
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* @final: **[mandatory]** Retrieve result from the driver. This function finalizes the
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* transformation and retrieves the resulting hash from the driver and
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* pushes it back to upper layers. No data processing happens at this
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* point unless hardware requires it to finish the transformation
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* (then the data buffered by the device driver is processed).
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* @finup: **[optional]** Combination of @update and @final. This function is effectively a
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* combination of @update and @final calls issued in sequence. As some
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* hardware cannot do @update and @final separately, this callback was
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* added to allow such hardware to be used at least by IPsec. Data
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* processing can happen synchronously [SHASH] or asynchronously [AHASH]
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* at this point.
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* @digest: Combination of @init and @update and @final. This function
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* effectively behaves as the entire chain of operations, @init,
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* @update and @final issued in sequence. Just like @finup, this was
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* added for hardware which cannot do even the @finup, but can only do
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* the whole transformation in one run. Data processing can happen
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* synchronously [SHASH] or asynchronously [AHASH] at this point.
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* @setkey: Set optional key used by the hashing algorithm. Intended to push
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* optional key used by the hashing algorithm from upper layers into
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* the driver. This function can store the key in the transformation
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* context or can outright program it into the hardware. In the former
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* case, one must be careful to program the key into the hardware at
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* appropriate time and one must be careful that .setkey() can be
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* called multiple times during the existence of the transformation
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* object. Not all hashing algorithms do implement this function as it
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* is only needed for keyed message digests. SHAx/MDx/CRCx do NOT
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* implement this function. HMAC(MDx)/HMAC(SHAx)/CMAC(AES) do implement
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* this function. This function must be called before any other of the
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* @init, @update, @final, @finup, @digest is called. No data
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* processing happens at this point.
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* @export: Export partial state of the transformation. This function dumps the
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* entire state of the ongoing transformation into a provided block of
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* data so it can be @import 'ed back later on. This is useful in case
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* you want to save partial result of the transformation after
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* processing certain amount of data and reload this partial result
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* multiple times later on for multiple re-use. No data processing
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* happens at this point. Driver must not use req->result.
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* @import: Import partial state of the transformation. This function loads the
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* entire state of the ongoing transformation from a provided block of
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* data so the transformation can continue from this point onward. No
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* data processing happens at this point. Driver must not use
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* req->result.
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* @init_tfm: Initialize the cryptographic transformation object.
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* This function is called only once at the instantiation
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* time, right after the transformation context was
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* allocated. In case the cryptographic hardware has
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* some special requirements which need to be handled
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* by software, this function shall check for the precise
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* requirement of the transformation and put any software
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* fallbacks in place.
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* @exit_tfm: Deinitialize the cryptographic transformation object.
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* This is a counterpart to @init_tfm, used to remove
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* various changes set in @init_tfm.
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* @halg: see struct hash_alg_common
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*/
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struct ahash_alg {
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int (*init)(struct ahash_request *req);
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int (*update)(struct ahash_request *req);
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int (*final)(struct ahash_request *req);
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int (*finup)(struct ahash_request *req);
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int (*digest)(struct ahash_request *req);
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int (*export)(struct ahash_request *req, void *out);
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int (*import)(struct ahash_request *req, const void *in);
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int (*setkey)(struct crypto_ahash *tfm, const u8 *key,
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unsigned int keylen);
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int (*init_tfm)(struct crypto_ahash *tfm);
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void (*exit_tfm)(struct crypto_ahash *tfm);
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struct hash_alg_common halg;
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};
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struct shash_desc {
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struct crypto_shash *tfm;
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void *__ctx[] __aligned(ARCH_SLAB_MINALIGN);
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};
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#define HASH_MAX_DIGESTSIZE 64
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/*
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* Worst case is hmac(sha3-224-generic). Its context is a nested 'shash_desc'
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* containing a 'struct sha3_state'.
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*/
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#define HASH_MAX_DESCSIZE (sizeof(struct shash_desc) + 360)
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#define HASH_MAX_STATESIZE 512
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#define SHASH_DESC_ON_STACK(shash, ctx) \
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char __##shash##_desc[sizeof(struct shash_desc) + HASH_MAX_DESCSIZE] \
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__aligned(__alignof__(struct shash_desc)); \
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struct shash_desc *shash = (struct shash_desc *)__##shash##_desc
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/**
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* struct shash_alg - synchronous message digest definition
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* @init: see struct ahash_alg
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* @update: see struct ahash_alg
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* @final: see struct ahash_alg
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* @finup: see struct ahash_alg
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* @digest: see struct ahash_alg
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* @export: see struct ahash_alg
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* @import: see struct ahash_alg
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* @setkey: see struct ahash_alg
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* @init_tfm: Initialize the cryptographic transformation object.
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* This function is called only once at the instantiation
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* time, right after the transformation context was
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* allocated. In case the cryptographic hardware has
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* some special requirements which need to be handled
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* by software, this function shall check for the precise
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* requirement of the transformation and put any software
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* fallbacks in place.
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* @exit_tfm: Deinitialize the cryptographic transformation object.
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* This is a counterpart to @init_tfm, used to remove
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* various changes set in @init_tfm.
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* @digestsize: see struct ahash_alg
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* @statesize: see struct ahash_alg
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* @descsize: Size of the operational state for the message digest. This state
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* size is the memory size that needs to be allocated for
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* shash_desc.__ctx
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* @base: internally used
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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 (*export)(struct shash_desc *desc, void *out);
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int (*import)(struct shash_desc *desc, const void *in);
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int (*setkey)(struct crypto_shash *tfm, const u8 *key,
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unsigned int keylen);
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int (*init_tfm)(struct crypto_shash *tfm);
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void (*exit_tfm)(struct crypto_shash *tfm);
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unsigned int descsize;
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/* These fields must match hash_alg_common. */
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unsigned int digestsize
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__attribute__ ((aligned(__alignof__(struct hash_alg_common))));
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unsigned int statesize;
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struct crypto_alg base;
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};
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struct crypto_ahash {
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int (*init)(struct ahash_request *req);
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int (*update)(struct ahash_request *req);
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int (*final)(struct ahash_request *req);
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int (*finup)(struct ahash_request *req);
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int (*digest)(struct ahash_request *req);
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int (*export)(struct ahash_request *req, void *out);
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int (*import)(struct ahash_request *req, const void *in);
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int (*setkey)(struct crypto_ahash *tfm, const u8 *key,
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unsigned int keylen);
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unsigned int reqsize;
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struct crypto_tfm base;
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};
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struct crypto_shash {
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unsigned int descsize;
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struct crypto_tfm base;
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};
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/**
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* DOC: Asynchronous Message Digest API
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*
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* The asynchronous message digest API is used with the ciphers of type
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* CRYPTO_ALG_TYPE_AHASH (listed as type "ahash" in /proc/crypto)
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*
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* The asynchronous cipher operation discussion provided for the
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* CRYPTO_ALG_TYPE_SKCIPHER API applies here as well.
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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 container_of(tfm, struct crypto_ahash, base);
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}
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/**
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* crypto_alloc_ahash() - allocate ahash cipher handle
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* @alg_name: is the cra_name / name or cra_driver_name / driver name of the
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* ahash cipher
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* @type: specifies the type of the cipher
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* @mask: specifies the mask for the cipher
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*
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* Allocate a cipher handle for an ahash. The returned struct
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* crypto_ahash is the cipher handle that is required for any subsequent
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* API invocation for that ahash.
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*
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* Return: allocated cipher handle in case of success; IS_ERR() is true in case
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* of an error, PTR_ERR() returns the error code.
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*/
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struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
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u32 mask);
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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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/**
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* crypto_free_ahash() - zeroize and free the ahash handle
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* @tfm: cipher handle to be freed
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*
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* If @tfm is a NULL or error pointer, this function does nothing.
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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_destroy_tfm(tfm, crypto_ahash_tfm(tfm));
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}
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/**
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* crypto_has_ahash() - Search for the availability of an ahash.
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* @alg_name: is the cra_name / name or cra_driver_name / driver name of the
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* ahash
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* @type: specifies the type of the ahash
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* @mask: specifies the mask for the ahash
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*
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* Return: true when the ahash is known to the kernel crypto API; false
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* otherwise
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*/
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int crypto_has_ahash(const char *alg_name, u32 type, u32 mask);
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static inline const char *crypto_ahash_alg_name(struct crypto_ahash *tfm)
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{
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return crypto_tfm_alg_name(crypto_ahash_tfm(tfm));
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}
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static inline const char *crypto_ahash_driver_name(struct crypto_ahash *tfm)
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{
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return crypto_tfm_alg_driver_name(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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/**
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* crypto_ahash_blocksize() - obtain block size for cipher
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* @tfm: cipher handle
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*
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* The block size for the message digest cipher referenced with the cipher
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* handle is returned.
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*
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* Return: block size of cipher
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*/
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static inline unsigned int crypto_ahash_blocksize(struct crypto_ahash *tfm)
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{
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return crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
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}
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static inline struct hash_alg_common *__crypto_hash_alg_common(
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struct crypto_alg *alg)
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{
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return container_of(alg, struct hash_alg_common, base);
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}
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static inline struct hash_alg_common *crypto_hash_alg_common(
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struct crypto_ahash *tfm)
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{
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return __crypto_hash_alg_common(crypto_ahash_tfm(tfm)->__crt_alg);
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}
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/**
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* crypto_ahash_digestsize() - obtain message digest size
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* @tfm: cipher handle
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*
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* The size for the message digest created by the message digest cipher
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* referenced with the cipher handle is returned.
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*
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*
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* Return: message digest size of cipher
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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_hash_alg_common(tfm)->digestsize;
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}
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/**
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* crypto_ahash_statesize() - obtain size of the ahash state
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* @tfm: cipher handle
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*
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* Return the size of the ahash state. With the crypto_ahash_export()
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* function, the caller can export the state into a buffer whose size is
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* defined with this function.
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*
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* Return: size of the ahash state
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*/
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static inline unsigned int crypto_ahash_statesize(struct crypto_ahash *tfm)
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{
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return crypto_hash_alg_common(tfm)->statesize;
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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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/**
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* crypto_ahash_reqtfm() - obtain cipher handle from request
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* @req: asynchronous request handle that contains the reference to the ahash
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* cipher handle
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*
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* Return the ahash cipher handle that is registered with the asynchronous
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* request handle ahash_request.
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*
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* Return: ahash cipher handle
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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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/**
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* crypto_ahash_reqsize() - obtain size of the request data structure
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* @tfm: cipher handle
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*
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* Return: size of the request data
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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 tfm->reqsize;
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}
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static inline void *ahash_request_ctx(struct ahash_request *req)
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{
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return req->__ctx;
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}
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/**
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* crypto_ahash_setkey - set key for cipher handle
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* @tfm: cipher handle
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* @key: buffer holding the key
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* @keylen: length of the key in bytes
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*
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* The caller provided key is set for the ahash cipher. The cipher
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* handle must point to a keyed hash in order for this function to succeed.
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*
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* Return: 0 if the setting of the key was successful; < 0 if an error occurred
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*/
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int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
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unsigned int keylen);
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/**
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* crypto_ahash_finup() - update and finalize message digest
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* @req: reference to the ahash_request handle that holds all information
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* needed to perform the cipher operation
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*
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* This function is a "short-hand" for the function calls of
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* crypto_ahash_update and crypto_ahash_final. The parameters have the same
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* meaning as discussed for those separate functions.
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*
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* Return: see crypto_ahash_final()
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*/
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int crypto_ahash_finup(struct ahash_request *req);
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/**
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* crypto_ahash_final() - calculate message digest
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* @req: reference to the ahash_request handle that holds all information
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* needed to perform the cipher operation
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*
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* Finalize the message digest operation and create the message digest
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* based on all data added to the cipher handle. The message digest is placed
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* into the output buffer registered with the ahash_request handle.
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*
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* Return:
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* 0 if the message digest was successfully calculated;
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* -EINPROGRESS if data is fed into hardware (DMA) or queued for later;
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* -EBUSY if queue is full and request should be resubmitted later;
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* other < 0 if an error occurred
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*/
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int crypto_ahash_final(struct ahash_request *req);
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/**
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* crypto_ahash_digest() - calculate message digest for a buffer
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* @req: reference to the ahash_request handle that holds all information
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* needed to perform the cipher operation
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*
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* This function is a "short-hand" for the function calls of crypto_ahash_init,
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* crypto_ahash_update and crypto_ahash_final. The parameters have the same
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* meaning as discussed for those separate three functions.
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*
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* Return: see crypto_ahash_final()
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*/
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int crypto_ahash_digest(struct ahash_request *req);
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/**
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* crypto_ahash_export() - extract current message digest state
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* @req: reference to the ahash_request handle whose state is exported
|
|
* @out: output buffer of sufficient size that can hold the hash state
|
|
*
|
|
* This function exports the hash state of the ahash_request handle into the
|
|
* caller-allocated output buffer out which must have sufficient size (e.g. by
|
|
* calling crypto_ahash_statesize()).
|
|
*
|
|
* Return: 0 if the export was successful; < 0 if an error occurred
|
|
*/
|
|
static inline int crypto_ahash_export(struct ahash_request *req, void *out)
|
|
{
|
|
return crypto_ahash_reqtfm(req)->export(req, out);
|
|
}
|
|
|
|
/**
|
|
* crypto_ahash_import() - import message digest state
|
|
* @req: reference to ahash_request handle the state is imported into
|
|
* @in: buffer holding the state
|
|
*
|
|
* This function imports the hash state into the ahash_request handle from the
|
|
* input buffer. That buffer should have been generated with the
|
|
* crypto_ahash_export function.
|
|
*
|
|
* Return: 0 if the import was successful; < 0 if an error occurred
|
|
*/
|
|
static inline int crypto_ahash_import(struct ahash_request *req, const void *in)
|
|
{
|
|
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
|
|
|
|
if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
|
|
return -ENOKEY;
|
|
|
|
return tfm->import(req, in);
|
|
}
|
|
|
|
/**
|
|
* crypto_ahash_init() - (re)initialize message digest handle
|
|
* @req: ahash_request handle that already is initialized with all necessary
|
|
* data using the ahash_request_* API functions
|
|
*
|
|
* The call (re-)initializes the message digest referenced by the ahash_request
|
|
* handle. Any potentially existing state created by previous operations is
|
|
* discarded.
|
|
*
|
|
* Return: see crypto_ahash_final()
|
|
*/
|
|
static inline int crypto_ahash_init(struct ahash_request *req)
|
|
{
|
|
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
|
|
|
|
if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
|
|
return -ENOKEY;
|
|
|
|
return tfm->init(req);
|
|
}
|
|
|
|
/**
|
|
* crypto_ahash_update() - add data to message digest for processing
|
|
* @req: ahash_request handle that was previously initialized with the
|
|
* crypto_ahash_init call.
|
|
*
|
|
* Updates the message digest state of the &ahash_request handle. The input data
|
|
* is pointed to by the scatter/gather list registered in the &ahash_request
|
|
* handle
|
|
*
|
|
* Return: see crypto_ahash_final()
|
|
*/
|
|
static inline int crypto_ahash_update(struct ahash_request *req)
|
|
{
|
|
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
|
|
struct crypto_alg *alg = tfm->base.__crt_alg;
|
|
unsigned int nbytes = req->nbytes;
|
|
int ret;
|
|
|
|
crypto_stats_get(alg);
|
|
ret = crypto_ahash_reqtfm(req)->update(req);
|
|
crypto_stats_ahash_update(nbytes, ret, alg);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* DOC: Asynchronous Hash Request Handle
|
|
*
|
|
* The &ahash_request data structure contains all pointers to data
|
|
* required for the asynchronous cipher operation. This includes the cipher
|
|
* handle (which can be used by multiple &ahash_request instances), pointer
|
|
* to plaintext and the message digest output buffer, asynchronous callback
|
|
* function, etc. It acts as a handle to the ahash_request_* API calls in a
|
|
* similar way as ahash handle to the crypto_ahash_* API calls.
|
|
*/
|
|
|
|
/**
|
|
* ahash_request_set_tfm() - update cipher handle reference in request
|
|
* @req: request handle to be modified
|
|
* @tfm: cipher handle that shall be added to the request handle
|
|
*
|
|
* Allow the caller to replace the existing ahash handle in the request
|
|
* data structure with a different one.
|
|
*/
|
|
static inline void ahash_request_set_tfm(struct ahash_request *req,
|
|
struct crypto_ahash *tfm)
|
|
{
|
|
req->base.tfm = crypto_ahash_tfm(tfm);
|
|
}
|
|
|
|
/**
|
|
* ahash_request_alloc() - allocate request data structure
|
|
* @tfm: cipher handle to be registered with the request
|
|
* @gfp: memory allocation flag that is handed to kmalloc by the API call.
|
|
*
|
|
* Allocate the request data structure that must be used with the ahash
|
|
* message digest API calls. During
|
|
* the allocation, the provided ahash handle
|
|
* is registered in the request data structure.
|
|
*
|
|
* Return: allocated request handle in case of success, or NULL if out of memory
|
|
*/
|
|
static inline struct ahash_request *ahash_request_alloc(
|
|
struct crypto_ahash *tfm, gfp_t gfp)
|
|
{
|
|
struct ahash_request *req;
|
|
|
|
req = kmalloc(sizeof(struct ahash_request) +
|
|
crypto_ahash_reqsize(tfm), gfp);
|
|
|
|
if (likely(req))
|
|
ahash_request_set_tfm(req, tfm);
|
|
|
|
return req;
|
|
}
|
|
|
|
/**
|
|
* ahash_request_free() - zeroize and free the request data structure
|
|
* @req: request data structure cipher handle to be freed
|
|
*/
|
|
static inline void ahash_request_free(struct ahash_request *req)
|
|
{
|
|
kfree_sensitive(req);
|
|
}
|
|
|
|
static inline void ahash_request_zero(struct ahash_request *req)
|
|
{
|
|
memzero_explicit(req, sizeof(*req) +
|
|
crypto_ahash_reqsize(crypto_ahash_reqtfm(req)));
|
|
}
|
|
|
|
static inline struct ahash_request *ahash_request_cast(
|
|
struct crypto_async_request *req)
|
|
{
|
|
return container_of(req, struct ahash_request, base);
|
|
}
|
|
|
|
/**
|
|
* ahash_request_set_callback() - set asynchronous callback function
|
|
* @req: request handle
|
|
* @flags: specify zero or an ORing of the flags
|
|
* CRYPTO_TFM_REQ_MAY_BACKLOG the request queue may back log and
|
|
* increase the wait queue beyond the initial maximum size;
|
|
* CRYPTO_TFM_REQ_MAY_SLEEP the request processing may sleep
|
|
* @compl: callback function pointer to be registered with the request handle
|
|
* @data: The data pointer refers to memory that is not used by the kernel
|
|
* crypto API, but provided to the callback function for it to use. Here,
|
|
* the caller can provide a reference to memory the callback function can
|
|
* operate on. As the callback function is invoked asynchronously to the
|
|
* related functionality, it may need to access data structures of the
|
|
* related functionality which can be referenced using this pointer. The
|
|
* callback function can access the memory via the "data" field in the
|
|
* &crypto_async_request data structure provided to the callback function.
|
|
*
|
|
* This function allows setting the callback function that is triggered once
|
|
* the cipher operation completes.
|
|
*
|
|
* The callback function is registered with the &ahash_request handle and
|
|
* must comply with the following template::
|
|
*
|
|
* void callback_function(struct crypto_async_request *req, int error)
|
|
*/
|
|
static inline void ahash_request_set_callback(struct ahash_request *req,
|
|
u32 flags,
|
|
crypto_completion_t compl,
|
|
void *data)
|
|
{
|
|
req->base.complete = compl;
|
|
req->base.data = data;
|
|
req->base.flags = flags;
|
|
}
|
|
|
|
/**
|
|
* ahash_request_set_crypt() - set data buffers
|
|
* @req: ahash_request handle to be updated
|
|
* @src: source scatter/gather list
|
|
* @result: buffer that is filled with the message digest -- the caller must
|
|
* ensure that the buffer has sufficient space by, for example, calling
|
|
* crypto_ahash_digestsize()
|
|
* @nbytes: number of bytes to process from the source scatter/gather list
|
|
*
|
|
* By using this call, the caller references the source scatter/gather list.
|
|
* The source scatter/gather list points to the data the message digest is to
|
|
* be calculated for.
|
|
*/
|
|
static inline void ahash_request_set_crypt(struct ahash_request *req,
|
|
struct scatterlist *src, u8 *result,
|
|
unsigned int nbytes)
|
|
{
|
|
req->src = src;
|
|
req->nbytes = nbytes;
|
|
req->result = result;
|
|
}
|
|
|
|
/**
|
|
* DOC: Synchronous Message Digest API
|
|
*
|
|
* The synchronous message digest API is used with the ciphers of type
|
|
* CRYPTO_ALG_TYPE_SHASH (listed as type "shash" in /proc/crypto)
|
|
*
|
|
* The message digest API is able to maintain state information for the
|
|
* caller.
|
|
*
|
|
* The synchronous message digest API can store user-related context in its
|
|
* shash_desc request data structure.
|
|
*/
|
|
|
|
/**
|
|
* crypto_alloc_shash() - allocate message digest handle
|
|
* @alg_name: is the cra_name / name or cra_driver_name / driver name of the
|
|
* message digest cipher
|
|
* @type: specifies the type of the cipher
|
|
* @mask: specifies the mask for the cipher
|
|
*
|
|
* Allocate a cipher handle for a message digest. The returned &struct
|
|
* crypto_shash is the cipher handle that is required for any subsequent
|
|
* API invocation for that message digest.
|
|
*
|
|
* Return: allocated cipher handle in case of success; IS_ERR() is true in case
|
|
* of an error, PTR_ERR() returns the error code.
|
|
*/
|
|
struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
|
|
u32 mask);
|
|
|
|
static inline struct crypto_tfm *crypto_shash_tfm(struct crypto_shash *tfm)
|
|
{
|
|
return &tfm->base;
|
|
}
|
|
|
|
/**
|
|
* crypto_free_shash() - zeroize and free the message digest handle
|
|
* @tfm: cipher handle to be freed
|
|
*
|
|
* If @tfm is a NULL or error pointer, this function does nothing.
|
|
*/
|
|
static inline void crypto_free_shash(struct crypto_shash *tfm)
|
|
{
|
|
crypto_destroy_tfm(tfm, crypto_shash_tfm(tfm));
|
|
}
|
|
|
|
static inline const char *crypto_shash_alg_name(struct crypto_shash *tfm)
|
|
{
|
|
return crypto_tfm_alg_name(crypto_shash_tfm(tfm));
|
|
}
|
|
|
|
static inline const char *crypto_shash_driver_name(struct crypto_shash *tfm)
|
|
{
|
|
return crypto_tfm_alg_driver_name(crypto_shash_tfm(tfm));
|
|
}
|
|
|
|
static inline unsigned int crypto_shash_alignmask(
|
|
struct crypto_shash *tfm)
|
|
{
|
|
return crypto_tfm_alg_alignmask(crypto_shash_tfm(tfm));
|
|
}
|
|
|
|
/**
|
|
* crypto_shash_blocksize() - obtain block size for cipher
|
|
* @tfm: cipher handle
|
|
*
|
|
* The block size for the message digest cipher referenced with the cipher
|
|
* handle is returned.
|
|
*
|
|
* Return: block size of cipher
|
|
*/
|
|
static inline unsigned int crypto_shash_blocksize(struct crypto_shash *tfm)
|
|
{
|
|
return crypto_tfm_alg_blocksize(crypto_shash_tfm(tfm));
|
|
}
|
|
|
|
static inline struct shash_alg *__crypto_shash_alg(struct crypto_alg *alg)
|
|
{
|
|
return container_of(alg, struct shash_alg, base);
|
|
}
|
|
|
|
static inline struct shash_alg *crypto_shash_alg(struct crypto_shash *tfm)
|
|
{
|
|
return __crypto_shash_alg(crypto_shash_tfm(tfm)->__crt_alg);
|
|
}
|
|
|
|
/**
|
|
* crypto_shash_digestsize() - obtain message digest size
|
|
* @tfm: cipher handle
|
|
*
|
|
* The size for the message digest created by the message digest cipher
|
|
* referenced with the cipher handle is returned.
|
|
*
|
|
* Return: digest size of cipher
|
|
*/
|
|
static inline unsigned int crypto_shash_digestsize(struct crypto_shash *tfm)
|
|
{
|
|
return crypto_shash_alg(tfm)->digestsize;
|
|
}
|
|
|
|
static inline unsigned int crypto_shash_statesize(struct crypto_shash *tfm)
|
|
{
|
|
return crypto_shash_alg(tfm)->statesize;
|
|
}
|
|
|
|
static inline u32 crypto_shash_get_flags(struct crypto_shash *tfm)
|
|
{
|
|
return crypto_tfm_get_flags(crypto_shash_tfm(tfm));
|
|
}
|
|
|
|
static inline void crypto_shash_set_flags(struct crypto_shash *tfm, u32 flags)
|
|
{
|
|
crypto_tfm_set_flags(crypto_shash_tfm(tfm), flags);
|
|
}
|
|
|
|
static inline void crypto_shash_clear_flags(struct crypto_shash *tfm, u32 flags)
|
|
{
|
|
crypto_tfm_clear_flags(crypto_shash_tfm(tfm), flags);
|
|
}
|
|
|
|
/**
|
|
* crypto_shash_descsize() - obtain the operational state size
|
|
* @tfm: cipher handle
|
|
*
|
|
* The size of the operational state the cipher needs during operation is
|
|
* returned for the hash referenced with the cipher handle. This size is
|
|
* required to calculate the memory requirements to allow the caller allocating
|
|
* sufficient memory for operational state.
|
|
*
|
|
* The operational state is defined with struct shash_desc where the size of
|
|
* that data structure is to be calculated as
|
|
* sizeof(struct shash_desc) + crypto_shash_descsize(alg)
|
|
*
|
|
* Return: size of the operational state
|
|
*/
|
|
static inline unsigned int crypto_shash_descsize(struct crypto_shash *tfm)
|
|
{
|
|
return tfm->descsize;
|
|
}
|
|
|
|
static inline void *shash_desc_ctx(struct shash_desc *desc)
|
|
{
|
|
return desc->__ctx;
|
|
}
|
|
|
|
/**
|
|
* crypto_shash_setkey() - set key for message digest
|
|
* @tfm: cipher handle
|
|
* @key: buffer holding the key
|
|
* @keylen: length of the key in bytes
|
|
*
|
|
* The caller provided key is set for the keyed message digest cipher. The
|
|
* cipher handle must point to a keyed message digest cipher in order for this
|
|
* function to succeed.
|
|
*
|
|
* Context: Any context.
|
|
* Return: 0 if the setting of the key was successful; < 0 if an error occurred
|
|
*/
|
|
int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
|
|
unsigned int keylen);
|
|
|
|
/**
|
|
* crypto_shash_digest() - calculate message digest for buffer
|
|
* @desc: see crypto_shash_final()
|
|
* @data: see crypto_shash_update()
|
|
* @len: see crypto_shash_update()
|
|
* @out: see crypto_shash_final()
|
|
*
|
|
* This function is a "short-hand" for the function calls of crypto_shash_init,
|
|
* crypto_shash_update and crypto_shash_final. The parameters have the same
|
|
* meaning as discussed for those separate three functions.
|
|
*
|
|
* Context: Any context.
|
|
* Return: 0 if the message digest creation was successful; < 0 if an error
|
|
* occurred
|
|
*/
|
|
int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
|
|
unsigned int len, u8 *out);
|
|
|
|
/**
|
|
* crypto_shash_tfm_digest() - calculate message digest for buffer
|
|
* @tfm: hash transformation object
|
|
* @data: see crypto_shash_update()
|
|
* @len: see crypto_shash_update()
|
|
* @out: see crypto_shash_final()
|
|
*
|
|
* This is a simplified version of crypto_shash_digest() for users who don't
|
|
* want to allocate their own hash descriptor (shash_desc). Instead,
|
|
* crypto_shash_tfm_digest() takes a hash transformation object (crypto_shash)
|
|
* directly, and it allocates a hash descriptor on the stack internally.
|
|
* Note that this stack allocation may be fairly large.
|
|
*
|
|
* Context: Any context.
|
|
* Return: 0 on success; < 0 if an error occurred.
|
|
*/
|
|
int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data,
|
|
unsigned int len, u8 *out);
|
|
|
|
/**
|
|
* crypto_shash_export() - extract operational state for message digest
|
|
* @desc: reference to the operational state handle whose state is exported
|
|
* @out: output buffer of sufficient size that can hold the hash state
|
|
*
|
|
* This function exports the hash state of the operational state handle into the
|
|
* caller-allocated output buffer out which must have sufficient size (e.g. by
|
|
* calling crypto_shash_descsize).
|
|
*
|
|
* Context: Any context.
|
|
* Return: 0 if the export creation was successful; < 0 if an error occurred
|
|
*/
|
|
static inline int crypto_shash_export(struct shash_desc *desc, void *out)
|
|
{
|
|
return crypto_shash_alg(desc->tfm)->export(desc, out);
|
|
}
|
|
|
|
/**
|
|
* crypto_shash_import() - import operational state
|
|
* @desc: reference to the operational state handle the state imported into
|
|
* @in: buffer holding the state
|
|
*
|
|
* This function imports the hash state into the operational state handle from
|
|
* the input buffer. That buffer should have been generated with the
|
|
* crypto_ahash_export function.
|
|
*
|
|
* Context: Any context.
|
|
* Return: 0 if the import was successful; < 0 if an error occurred
|
|
*/
|
|
static inline int crypto_shash_import(struct shash_desc *desc, const void *in)
|
|
{
|
|
struct crypto_shash *tfm = desc->tfm;
|
|
|
|
if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
|
|
return -ENOKEY;
|
|
|
|
return crypto_shash_alg(tfm)->import(desc, in);
|
|
}
|
|
|
|
/**
|
|
* crypto_shash_init() - (re)initialize message digest
|
|
* @desc: operational state handle that is already filled
|
|
*
|
|
* The call (re-)initializes the message digest referenced by the
|
|
* operational state handle. Any potentially existing state created by
|
|
* previous operations is discarded.
|
|
*
|
|
* Context: Any context.
|
|
* Return: 0 if the message digest initialization was successful; < 0 if an
|
|
* error occurred
|
|
*/
|
|
static inline int crypto_shash_init(struct shash_desc *desc)
|
|
{
|
|
struct crypto_shash *tfm = desc->tfm;
|
|
|
|
if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
|
|
return -ENOKEY;
|
|
|
|
return crypto_shash_alg(tfm)->init(desc);
|
|
}
|
|
|
|
/**
|
|
* crypto_shash_update() - add data to message digest for processing
|
|
* @desc: operational state handle that is already initialized
|
|
* @data: input data to be added to the message digest
|
|
* @len: length of the input data
|
|
*
|
|
* Updates the message digest state of the operational state handle.
|
|
*
|
|
* Context: Any context.
|
|
* Return: 0 if the message digest update was successful; < 0 if an error
|
|
* occurred
|
|
*/
|
|
int crypto_shash_update(struct shash_desc *desc, const u8 *data,
|
|
unsigned int len);
|
|
|
|
/**
|
|
* crypto_shash_final() - calculate message digest
|
|
* @desc: operational state handle that is already filled with data
|
|
* @out: output buffer filled with the message digest
|
|
*
|
|
* Finalize the message digest operation and create the message digest
|
|
* based on all data added to the cipher handle. The message digest is placed
|
|
* into the output buffer. The caller must ensure that the output buffer is
|
|
* large enough by using crypto_shash_digestsize.
|
|
*
|
|
* Context: Any context.
|
|
* Return: 0 if the message digest creation was successful; < 0 if an error
|
|
* occurred
|
|
*/
|
|
int crypto_shash_final(struct shash_desc *desc, u8 *out);
|
|
|
|
/**
|
|
* crypto_shash_finup() - calculate message digest of buffer
|
|
* @desc: see crypto_shash_final()
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* @data: see crypto_shash_update()
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* @len: see crypto_shash_update()
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* @out: see crypto_shash_final()
|
|
*
|
|
* This function is a "short-hand" for the function calls of
|
|
* crypto_shash_update and crypto_shash_final. The parameters have the same
|
|
* meaning as discussed for those separate functions.
|
|
*
|
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* Context: Any context.
|
|
* Return: 0 if the message digest creation was successful; < 0 if an error
|
|
* occurred
|
|
*/
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|
int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
|
|
unsigned int len, u8 *out);
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|
|
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static inline void shash_desc_zero(struct shash_desc *desc)
|
|
{
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|
memzero_explicit(desc,
|
|
sizeof(*desc) + crypto_shash_descsize(desc->tfm));
|
|
}
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#endif /* _CRYPTO_HASH_H */
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