| 1 |
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| 2 | |
| 3 | * Hash: Hash algorithms under the crypto API
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| 4 | *
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| 5 | * Copyright (c) 2008 Herbert Xu <[email protected]>
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| 6 |
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| 7 |
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| 8 | #ifndef _CRYPTO_HASH_H
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| 9 | #define _CRYPTO_HASH_H
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| 10 |
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| 11 | #include <linux/crypto.h>
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| 12 | #include <linux/scatterlist.h>
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| 13 | #include <linux/slab.h>
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| 14 | #include <linux/string.h>
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| 15 |
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| 16 |
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| 17 | #define CRYPTO_AHASH_REQ_VIRT 0x00000001
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| 18 |
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| 19 | #define CRYPTO_AHASH_REQ_PRIVATE \
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| 20 | CRYPTO_AHASH_REQ_VIRT
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| 21 |
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| 22 | struct crypto_ahash;
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| 23 |
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| 24 | |
| 25 | * DOC: Message Digest Algorithm Definitions
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| 26 | *
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| 27 | * These data structures define modular message digest algorithm
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| 28 | * implementations, managed via crypto_register_ahash(),
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| 29 | * crypto_register_shash(), crypto_unregister_ahash() and
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| 30 | * crypto_unregister_shash().
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| 31 |
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| 32 |
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| 33 | |
| 34 | * struct hash_alg_common - define properties of message digest
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| 35 | * @digestsize: Size of the result of the transformation. A buffer of this size
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| 36 | * must be available to the @final and @finup calls, so they can
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| 37 | * store the resulting hash into it. For various predefined sizes,
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| 38 | * search include/crypto/ using
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| 39 | * git grep _DIGEST_SIZE include/crypto.
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| 40 | * @statesize: Size of the block for partial state of the transformation. A
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| 41 | * buffer of this size must be passed to the @export function as it
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| 42 | * will save the partial state of the transformation into it. On the
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| 43 | * other side, the @import function will load the state from a
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| 44 | * buffer of this size as well.
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| 45 | * @base: Start of data structure of cipher algorithm. The common data
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| 46 | * structure of crypto_alg contains information common to all ciphers.
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| 47 | * The hash_alg_common data structure now adds the hash-specific
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| 48 | * information.
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| 49 |
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| 50 | #define HASH_ALG_COMMON { \
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| 51 | unsigned int digestsize; \
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| 52 | unsigned int statesize; \
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| 53 | \
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| 54 | struct crypto_alg base; \
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| 55 | }
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| 56 | struct hash_alg_common HASH_ALG_COMMON;
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| 57 |
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| 58 | struct ahash_request {
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| 59 | struct crypto_async_request base;
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| 60 |
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| 61 | unsigned int nbytes;
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| 62 | union {
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| 63 | struct scatterlist *src;
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| 64 | const u8 *svirt;
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| 65 | };
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| 66 | u8 *result;
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| 67 |
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| 68 | struct scatterlist sg_head[2];
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| 69 | crypto_completion_t saved_complete;
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| 70 | void *saved_data;
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| 71 |
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| 72 | void *__ctx[] CRYPTO_MINALIGN_ATTR;
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| 73 | };
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| 74 |
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| 75 | |
| 76 | * struct ahash_alg - asynchronous message digest definition
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| 77 | * @init: **[mandatory]** Initialize the transformation context. Intended only to initialize the
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| 78 | * state of the HASH transformation at the beginning. This shall fill in
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| 79 | * the internal structures used during the entire duration of the whole
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| 80 | * transformation. No data processing happens at this point. Driver code
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| 81 | * implementation must not use req->result.
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| 82 | * @update: **[mandatory]** Push a chunk of data into the driver for transformation. This
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| 83 | * function actually pushes blocks of data from upper layers into the
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| 84 | * driver, which then passes those to the hardware as seen fit. This
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| 85 | * function must not finalize the HASH transformation by calculating the
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| 86 | * final message digest as this only adds more data into the
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| 87 | * transformation. This function shall not modify the transformation
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| 88 | * context, as this function may be called in parallel with the same
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| 89 | * transformation object. Data processing can happen synchronously
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| 90 | * [SHASH] or asynchronously [AHASH] at this point. Driver must not use
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| 91 | * req->result.
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| 92 | * For block-only algorithms, @update must return the number
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| 93 | * of bytes to store in the API partial block buffer.
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| 94 | * @final: **[mandatory]** Retrieve result from the driver. This function finalizes the
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| 95 | * transformation and retrieves the resulting hash from the driver and
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| 96 | * pushes it back to upper layers. No data processing happens at this
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| 97 | * point unless hardware requires it to finish the transformation
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| 98 | * (then the data buffered by the device driver is processed).
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| 99 | * @finup: **[optional]** Combination of @update and @final. This function is effectively a
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| 100 | * combination of @update and @final calls issued in sequence. As some
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| 101 | * hardware cannot do @update and @final separately, this callback was
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| 102 | * added to allow such hardware to be used at least by IPsec. Data
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| 103 | * processing can happen synchronously [SHASH] or asynchronously [AHASH]
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| 104 | * at this point.
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| 105 | * @digest: Combination of @init and @update and @final. This function
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| 106 | * effectively behaves as the entire chain of operations, @init,
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| 107 | * @update and @final issued in sequence. Just like @finup, this was
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| 108 | * added for hardware which cannot do even the @finup, but can only do
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| 109 | * the whole transformation in one run. Data processing can happen
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| 110 | * synchronously [SHASH] or asynchronously [AHASH] at this point.
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| 111 | * @setkey: Set optional key used by the hashing algorithm. Intended to push
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| 112 | * optional key used by the hashing algorithm from upper layers into
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| 113 | * the driver. This function can store the key in the transformation
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| 114 | * context or can outright program it into the hardware. In the former
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| 115 | * case, one must be careful to program the key into the hardware at
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| 116 | * appropriate time and one must be careful that .setkey() can be
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| 117 | * called multiple times during the existence of the transformation
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| 118 | * object. Not all hashing algorithms do implement this function as it
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| 119 | * is only needed for keyed message digests. SHAx/MDx/CRCx do NOT
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| 120 | * implement this function. HMAC(MDx)/HMAC(SHAx)/CMAC(AES) do implement
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| 121 | * this function. This function must be called before any other of the
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| 122 | * @init, @update, @final, @finup, @digest is called. No data
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| 123 | * processing happens at this point.
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| 124 | * @export: Export partial state of the transformation. This function dumps the
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| 125 | * entire state of the ongoing transformation into a provided block of
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| 126 | * data so it can be @import 'ed back later on. This is useful in case
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| 127 | * you want to save partial result of the transformation after
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| 128 | * processing certain amount of data and reload this partial result
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| 129 | * multiple times later on for multiple re-use. No data processing
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| 130 | * happens at this point. Driver must not use req->result.
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| 131 | * @import: Import partial state of the transformation. This function loads the
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| 132 | * entire state of the ongoing transformation from a provided block of
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| 133 | * data so the transformation can continue from this point onward. No
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| 134 | * data processing happens at this point. Driver must not use
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| 135 | * req->result.
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| 136 | * @export_core: Export partial state without partial block. Only defined
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| 137 | * for algorithms that are not block-only.
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| 138 | * @import_core: Import partial state without partial block. Only defined
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| 139 | * for algorithms that are not block-only.
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| 140 | * @init_tfm: Initialize the cryptographic transformation object.
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| 141 | * This function is called only once at the instantiation
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| 142 | * time, right after the transformation context was
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| 143 | * allocated. In case the cryptographic hardware has
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| 144 | * some special requirements which need to be handled
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| 145 | * by software, this function shall check for the precise
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| 146 | * requirement of the transformation and put any software
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| 147 | * fallbacks in place.
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| 148 | * @exit_tfm: Deinitialize the cryptographic transformation object.
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| 149 | * This is a counterpart to @init_tfm, used to remove
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| 150 | * various changes set in @init_tfm.
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| 151 | * @halg: see struct hash_alg_common
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| 152 |
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| 153 | struct ahash_alg {
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| 154 | int (*init)(struct ahash_request *req);
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| 155 | int (*update)(struct ahash_request *req);
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| 156 | int (*final)(struct ahash_request *req);
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| 157 | int (*finup)(struct ahash_request *req);
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| 158 | int (*digest)(struct ahash_request *req);
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| 159 | int (*export)(struct ahash_request *req, void *out);
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| 160 | int (*import)(struct ahash_request *req, const void *in);
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| 161 | int (*export_core)(struct ahash_request *req, void *out);
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| 162 | int (*import_core)(struct ahash_request *req, const void *in);
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| 163 | int (*setkey)(struct crypto_ahash *tfm, const u8 *key,
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| 164 | unsigned int keylen);
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| 165 | int (*init_tfm)(struct crypto_ahash *tfm);
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| 166 | void (*exit_tfm)(struct crypto_ahash *tfm);
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| 167 |
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| 168 | struct hash_alg_common halg;
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| 169 | };
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| 170 |
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| 171 | struct shash_desc {
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| 172 | struct crypto_shash *tfm;
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| 173 | void *__ctx[] __aligned(ARCH_SLAB_MINALIGN);
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| 174 | };
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| 175 |
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| 176 | #define HASH_MAX_DIGESTSIZE 64
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| 177 |
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| 178 | |
| 179 | * The size of a core hash state and a partial block. The final byte
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| 180 | * is the length of the partial block.
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| 181 |
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| 182 | #define HASH_STATE_AND_BLOCK(state, block) ((state) + (block) + 1)
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| 183 |
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| 184 |
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| 185 |
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| 186 | #define HASH_MAX_STATESIZE HASH_STATE_AND_BLOCK(200, 144)
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| 187 |
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| 188 |
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| 189 | #define S390_SHA_CTX_SIZE 216
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| 190 |
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| 191 | |
| 192 | * Worst case is hmac(sha3-224-s390). Its context is a nested 'shash_desc'
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| 193 | * containing a 'struct s390_sha_ctx'.
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| 194 |
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| 195 | #define SHA3_224_S390_DESCSIZE HASH_STATE_AND_BLOCK(S390_SHA_CTX_SIZE, 144)
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| 196 | #define HASH_MAX_DESCSIZE (sizeof(struct shash_desc) + \
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| 197 | SHA3_224_S390_DESCSIZE)
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| 198 | #define MAX_SYNC_HASH_REQSIZE (sizeof(struct ahash_request) + \
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| 199 | HASH_MAX_DESCSIZE)
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| 200 |
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| 201 | #define SHASH_DESC_ON_STACK(shash, ctx) \
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| 202 | char __##shash##_desc[sizeof(struct shash_desc) + HASH_MAX_DESCSIZE] \
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| 203 | __aligned(__alignof__(struct shash_desc)); \
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| 204 | struct shash_desc *shash = (struct shash_desc *)__##shash##_desc
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| 205 |
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| 206 | #define HASH_REQUEST_ON_STACK(name, _tfm) \
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| 207 | char __##name##_req[sizeof(struct ahash_request) + \
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| 208 | MAX_SYNC_HASH_REQSIZE] CRYPTO_MINALIGN_ATTR; \
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| 209 | struct ahash_request *name = \
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| 210 | ahash_request_on_stack_init(__##name##_req, (_tfm))
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| 211 |
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| 212 | #define HASH_REQUEST_CLONE(name, gfp) \
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| 213 | hash_request_clone(name, sizeof(__##name##_req), gfp)
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| 214 |
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| 215 | #define CRYPTO_HASH_STATESIZE(coresize, blocksize) (coresize + blocksize + 1)
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| 216 |
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| 217 | |
| 218 | * struct shash_alg - synchronous message digest definition
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| 219 | * @init: see struct ahash_alg
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| 220 | * @update: see struct ahash_alg
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| 221 | * @final: see struct ahash_alg
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| 222 | * @finup: see struct ahash_alg
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| 223 | * @digest: see struct ahash_alg
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| 224 | * @export: see struct ahash_alg
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| 225 | * @import: see struct ahash_alg
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| 226 | * @export_core: see struct ahash_alg
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| 227 | * @import_core: see struct ahash_alg
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| 228 | * @setkey: see struct ahash_alg
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| 229 | * @init_tfm: Initialize the cryptographic transformation object.
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| 230 | * This function is called only once at the instantiation
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| 231 | * time, right after the transformation context was
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| 232 | * allocated. In case the cryptographic hardware has
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| 233 | * some special requirements which need to be handled
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| 234 | * by software, this function shall check for the precise
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| 235 | * requirement of the transformation and put any software
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| 236 | * fallbacks in place.
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| 237 | * @exit_tfm: Deinitialize the cryptographic transformation object.
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| 238 | * This is a counterpart to @init_tfm, used to remove
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| 239 | * various changes set in @init_tfm.
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| 240 | * @descsize: Size of the operational state for the message digest. This state
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| 241 | * size is the memory size that needs to be allocated for
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| 242 | * shash_desc.__ctx
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| 243 | * @halg: see struct hash_alg_common
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| 244 | * @HASH_ALG_COMMON: see struct hash_alg_common
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| 245 |
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| 246 | struct shash_alg {
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| 247 | int (*init)(struct shash_desc *desc);
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| 248 | int (*update)(struct shash_desc *desc, const u8 *data,
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| 249 | unsigned int len);
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| 250 | int (*final)(struct shash_desc *desc, u8 *out);
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| 251 | int (*finup)(struct shash_desc *desc, const u8 *data,
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| 252 | unsigned int len, u8 *out);
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| 253 | int (*digest)(struct shash_desc *desc, const u8 *data,
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| 254 | unsigned int len, u8 *out);
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| 255 | int (*export)(struct shash_desc *desc, void *out);
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| 256 | int (*import)(struct shash_desc *desc, const void *in);
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| 257 | int (*export_core)(struct shash_desc *desc, void *out);
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| 258 | int (*import_core)(struct shash_desc *desc, const void *in);
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| 259 | int (*setkey)(struct crypto_shash *tfm, const u8 *key,
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| 260 | unsigned int keylen);
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| 261 | int (*init_tfm)(struct crypto_shash *tfm);
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| 262 | void (*exit_tfm)(struct crypto_shash *tfm);
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| 263 |
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| 264 | unsigned int descsize;
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| 265 |
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| 266 | union {
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| 267 | struct HASH_ALG_COMMON;
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| 268 | struct hash_alg_common halg;
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| 269 | };
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| 270 | };
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| 271 | #undef HASH_ALG_COMMON
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| 272 |
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| 273 | struct crypto_ahash {
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| 274 | bool using_shash;
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| 275 | unsigned int statesize;
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| 276 | unsigned int reqsize;
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| 277 | struct crypto_tfm base;
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| 278 | };
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| 279 |
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| 280 | struct crypto_shash {
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| 281 | struct crypto_tfm base;
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| 282 | };
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| 283 |
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| 284 | |
| 285 | * DOC: Asynchronous Message Digest API
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| 286 | *
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| 287 | * The asynchronous message digest API is used with the ciphers of type
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| 288 | * CRYPTO_ALG_TYPE_AHASH (listed as type "ahash" in /proc/crypto)
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| 289 | *
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| 290 | * The asynchronous cipher operation discussion provided for the
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| 291 | * CRYPTO_ALG_TYPE_SKCIPHER API applies here as well.
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| 292 |
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| 293 |
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| 294 | static inline bool ahash_req_on_stack(struct ahash_request *req)
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| 295 | {
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| 296 | return crypto_req_on_stack(&req->base);
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| 297 | }
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| 298 |
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| 299 | static inline struct crypto_ahash *__crypto_ahash_cast(struct crypto_tfm *tfm)
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| 300 | {
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| 301 | return container_of(tfm, struct crypto_ahash, base);
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| 302 | }
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| 303 |
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| 304 | |
| 305 | * crypto_alloc_ahash() - allocate ahash cipher handle
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| 306 | * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
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| 307 | * ahash cipher
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| 308 | * @type: specifies the type of the cipher
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| 309 | * @mask: specifies the mask for the cipher
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| 310 | *
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| 311 | * Allocate a cipher handle for an ahash. The returned struct
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| 312 | * crypto_ahash is the cipher handle that is required for any subsequent
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| 313 | * API invocation for that ahash.
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| 314 | *
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| 315 | * Return: allocated cipher handle in case of success; IS_ERR() is true in case
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| 316 | * of an error, PTR_ERR() returns the error code.
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| 317 |
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| 318 | struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
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| 319 | u32 mask);
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| 320 |
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| 321 | static inline struct crypto_tfm *crypto_ahash_tfm(struct crypto_ahash *tfm)
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| 322 | {
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| 323 | return &tfm->base;
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| 324 | }
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| 325 |
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| 326 | |
| 327 | * crypto_free_ahash() - zeroize and free the ahash handle
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| 328 | * @tfm: cipher handle to be freed
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| 329 | *
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| 330 | * If @tfm is a NULL or error pointer, this function does nothing.
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| 331 |
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| 332 | static inline void crypto_free_ahash(struct crypto_ahash *tfm)
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| 333 | {
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| 334 | crypto_destroy_tfm(tfm, crypto_ahash_tfm(tfm));
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| 335 | }
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| 336 |
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| 337 | |
| 338 | * crypto_has_ahash() - Search for the availability of an ahash.
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| 339 | * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
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| 340 | * ahash
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| 341 | * @type: specifies the type of the ahash
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| 342 | * @mask: specifies the mask for the ahash
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| 343 | *
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| 344 | * Return: true when the ahash is known to the kernel crypto API; false
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| 345 | * otherwise
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| 346 |
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| 347 | int crypto_has_ahash(const char *alg_name, u32 type, u32 mask);
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| 348 |
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| 349 | static inline const char *crypto_ahash_alg_name(struct crypto_ahash *tfm)
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| 350 | {
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| 351 | return crypto_tfm_alg_name(crypto_ahash_tfm(tfm));
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| 352 | }
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| 353 |
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| 354 | static inline const char *crypto_ahash_driver_name(struct crypto_ahash *tfm)
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| 355 | {
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| 356 | return crypto_tfm_alg_driver_name(crypto_ahash_tfm(tfm));
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| 357 | }
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| 358 |
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| 359 | |
| 360 | * crypto_ahash_blocksize() - obtain block size for cipher
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| 361 | * @tfm: cipher handle
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| 362 | *
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| 363 | * The block size for the message digest cipher referenced with the cipher
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| 364 | * handle is returned.
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| 365 | *
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| 366 | * Return: block size of cipher
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| 367 |
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| 368 | static inline unsigned int crypto_ahash_blocksize(struct crypto_ahash *tfm)
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| 369 | {
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| 370 | return crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
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| 371 | }
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| 372 |
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| 373 | static inline struct hash_alg_common *__crypto_hash_alg_common(
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| 374 | struct crypto_alg *alg)
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| 375 | {
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| 376 | return container_of(alg, struct hash_alg_common, base);
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| 377 | }
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| 378 |
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| 379 | static inline struct hash_alg_common *crypto_hash_alg_common(
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| 380 | struct crypto_ahash *tfm)
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| 381 | {
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| 382 | return __crypto_hash_alg_common(crypto_ahash_tfm(tfm)->__crt_alg);
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| 383 | }
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| 384 |
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| 385 | |
| 386 | * crypto_ahash_digestsize() - obtain message digest size
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| 387 | * @tfm: cipher handle
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| 388 | *
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| 389 | * The size for the message digest created by the message digest cipher
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| 390 | * referenced with the cipher handle is returned.
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| 391 | *
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| 392 | *
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| 393 | * Return: message digest size of cipher
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| 394 |
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| 395 | static inline unsigned int crypto_ahash_digestsize(struct crypto_ahash *tfm)
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| 396 | {
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| 397 | return crypto_hash_alg_common(tfm)->digestsize;
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| 398 | }
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| 399 |
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| 400 | |
| 401 | * crypto_ahash_statesize() - obtain size of the ahash state
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| 402 | * @tfm: cipher handle
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| 403 | *
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| 404 | * Return the size of the ahash state. With the crypto_ahash_export()
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| 405 | * function, the caller can export the state into a buffer whose size is
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| 406 | * defined with this function.
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| 407 | *
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| 408 | * Return: size of the ahash state
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| 409 |
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| 410 | static inline unsigned int crypto_ahash_statesize(struct crypto_ahash *tfm)
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| 411 | {
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| 412 | return tfm->statesize;
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| 413 | }
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| 414 |
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| 415 | static inline u32 crypto_ahash_get_flags(struct crypto_ahash *tfm)
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| 416 | {
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| 417 | return crypto_tfm_get_flags(crypto_ahash_tfm(tfm));
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| 418 | }
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| 419 |
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| 420 | static inline void crypto_ahash_set_flags(struct crypto_ahash *tfm, u32 flags)
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| 421 | {
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| 422 | crypto_tfm_set_flags(crypto_ahash_tfm(tfm), flags);
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| 423 | }
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| 424 |
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| 425 | static inline void crypto_ahash_clear_flags(struct crypto_ahash *tfm, u32 flags)
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| 426 | {
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| 427 | crypto_tfm_clear_flags(crypto_ahash_tfm(tfm), flags);
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| 428 | }
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| 429 |
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| 430 | |
| 431 | * crypto_ahash_reqtfm() - obtain cipher handle from request
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| 432 | * @req: asynchronous request handle that contains the reference to the ahash
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| 433 | * cipher handle
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| 434 | *
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| 435 | * Return the ahash cipher handle that is registered with the asynchronous
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| 436 | * request handle ahash_request.
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| 437 | *
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| 438 | * Return: ahash cipher handle
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| 439 |
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| 440 | static inline struct crypto_ahash *crypto_ahash_reqtfm(
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| 441 | struct ahash_request *req)
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| 442 | {
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| 443 | return __crypto_ahash_cast(req->base.tfm);
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| 444 | }
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| 445 |
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| 446 | |
| 447 | * crypto_ahash_reqsize() - obtain size of the request data structure
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| 448 | * @tfm: cipher handle
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| 449 | *
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| 450 | * Return: size of the request data
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| 451 |
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| 452 | static inline unsigned int crypto_ahash_reqsize(struct crypto_ahash *tfm)
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| 453 | {
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| 454 | return tfm->reqsize;
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| 455 | }
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| 456 |
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| 457 | static inline void *ahash_request_ctx(struct ahash_request *req)
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| 458 | {
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| 459 | return req->__ctx;
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| 460 | }
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| 461 |
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| 462 | |
| 463 | * crypto_ahash_setkey - set key for cipher handle
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| 464 | * @tfm: cipher handle
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| 465 | * @key: buffer holding the key
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| 466 | * @keylen: length of the key in bytes
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| 467 | *
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| 468 | * The caller provided key is set for the ahash cipher. The cipher
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| 469 | * handle must point to a keyed hash in order for this function to succeed.
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| 470 | *
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| 471 | * Return: 0 if the setting of the key was successful; < 0 if an error occurred
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| 472 |
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| 473 | int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
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| 474 | unsigned int keylen);
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| 475 |
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| 476 | |
| 477 | * crypto_ahash_finup() - update and finalize message digest
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| 478 | * @req: reference to the ahash_request handle that holds all information
|
| 479 | * needed to perform the cipher operation
|
| 480 | *
|
| 481 | * This function is a "short-hand" for the function calls of
|
| 482 | * crypto_ahash_update and crypto_ahash_final. The parameters have the same
|
| 483 | * meaning as discussed for those separate functions.
|
| 484 | *
|
| 485 | * Return: see crypto_ahash_final()
|
| 486 |
|
| 487 | int crypto_ahash_finup(struct ahash_request *req);
|
| 488 |
|
| 489 | |
| 490 | * crypto_ahash_final() - calculate message digest
|
| 491 | * @req: reference to the ahash_request handle that holds all information
|
| 492 | * needed to perform the cipher operation
|
| 493 | *
|
| 494 | * Finalize the message digest operation and create the message digest
|
| 495 | * based on all data added to the cipher handle. The message digest is placed
|
| 496 | * into the output buffer registered with the ahash_request handle.
|
| 497 | *
|
| 498 | * Return:
|
| 499 | * 0 if the message digest was successfully calculated;
|
| 500 | * -EINPROGRESS if data is fed into hardware (DMA) or queued for later;
|
| 501 | * -EBUSY if queue is full and request should be resubmitted later;
|
| 502 | * other < 0 if an error occurred
|
| 503 |
|
| 504 | static inline int crypto_ahash_final(struct ahash_request *req)
|
| 505 | {
|
| 506 | req->nbytes = 0;
|
| 507 | return crypto_ahash_finup(req);
|
| 508 | }
|
| 509 |
|
| 510 | |
| 511 | * crypto_ahash_digest() - calculate message digest for a buffer
|
| 512 | * @req: reference to the ahash_request handle that holds all information
|
| 513 | * needed to perform the cipher operation
|
| 514 | *
|
| 515 | * This function is a "short-hand" for the function calls of crypto_ahash_init,
|
| 516 | * crypto_ahash_update and crypto_ahash_final. The parameters have the same
|
| 517 | * meaning as discussed for those separate three functions.
|
| 518 | *
|
| 519 | * Return: see crypto_ahash_final()
|
| 520 |
|
| 521 | int crypto_ahash_digest(struct ahash_request *req);
|
| 522 |
|
| 523 | |
| 524 | * crypto_ahash_export() - extract current message digest state
|
| 525 | * @req: reference to the ahash_request handle whose state is exported
|
| 526 | * @out: output buffer of sufficient size that can hold the hash state
|
| 527 | *
|
| 528 | * This function exports the hash state of the ahash_request handle into the
|
| 529 | * caller-allocated output buffer out which must have sufficient size (e.g. by
|
| 530 | * calling crypto_ahash_statesize()).
|
| 531 | *
|
| 532 | * Return: 0 if the export was successful; < 0 if an error occurred
|
| 533 |
|
| 534 | int crypto_ahash_export(struct ahash_request *req, void *out);
|
| 535 |
|
| 536 | |
| 537 | * crypto_ahash_import() - import message digest state
|
| 538 | * @req: reference to ahash_request handle the state is imported into
|
| 539 | * @in: buffer holding the state
|
| 540 | *
|
| 541 | * This function imports the hash state into the ahash_request handle from the
|
| 542 | * input buffer. That buffer should have been generated with the
|
| 543 | * crypto_ahash_export function.
|
| 544 | *
|
| 545 | * Return: 0 if the import was successful; < 0 if an error occurred
|
| 546 |
|
| 547 | int crypto_ahash_import(struct ahash_request *req, const void *in);
|
| 548 |
|
| 549 | |
| 550 | * crypto_ahash_init() - (re)initialize message digest handle
|
| 551 | * @req: ahash_request handle that already is initialized with all necessary
|
| 552 | * data using the ahash_request_* API functions
|
| 553 | *
|
| 554 | * The call (re-)initializes the message digest referenced by the ahash_request
|
| 555 | * handle. Any potentially existing state created by previous operations is
|
| 556 | * discarded.
|
| 557 | *
|
| 558 | * Return: see crypto_ahash_final()
|
| 559 |
|
| 560 | int crypto_ahash_init(struct ahash_request *req);
|
| 561 |
|
| 562 | |
| 563 | * crypto_ahash_update() - add data to message digest for processing
|
| 564 | * @req: ahash_request handle that was previously initialized with the
|
| 565 | * crypto_ahash_init call.
|
| 566 | *
|
| 567 | * Updates the message digest state of the &ahash_request handle. The input data
|
| 568 | * is pointed to by the scatter/gather list registered in the &ahash_request
|
| 569 | * handle
|
| 570 | *
|
| 571 | * Return: see crypto_ahash_final()
|
| 572 |
|
| 573 | int crypto_ahash_update(struct ahash_request *req);
|
| 574 |
|
| 575 | |
| 576 | * DOC: Asynchronous Hash Request Handle
|
| 577 | *
|
| 578 | * The &ahash_request data structure contains all pointers to data
|
| 579 | * required for the asynchronous cipher operation. This includes the cipher
|
| 580 | * handle (which can be used by multiple &ahash_request instances), pointer
|
| 581 | * to plaintext and the message digest output buffer, asynchronous callback
|
| 582 | * function, etc. It acts as a handle to the ahash_request_* API calls in a
|
| 583 | * similar way as ahash handle to the crypto_ahash_* API calls.
|
| 584 |
|
| 585 |
|
| 586 | |
| 587 | * ahash_request_set_tfm() - update cipher handle reference in request
|
| 588 | * @req: request handle to be modified
|
| 589 | * @tfm: cipher handle that shall be added to the request handle
|
| 590 | *
|
| 591 | * Allow the caller to replace the existing ahash handle in the request
|
| 592 | * data structure with a different one.
|
| 593 |
|
| 594 | static inline void ahash_request_set_tfm(struct ahash_request *req,
|
| 595 | struct crypto_ahash *tfm)
|
| 596 | {
|
| 597 | crypto_request_set_tfm(&req->base, crypto_ahash_tfm(tfm));
|
| 598 | }
|
| 599 |
|
| 600 | |
| 601 | * ahash_request_alloc() - allocate request data structure
|
| 602 | * @tfm: cipher handle to be registered with the request
|
| 603 | * @gfp: memory allocation flag that is handed to kmalloc by the API call.
|
| 604 | *
|
| 605 | * Allocate the request data structure that must be used with the ahash
|
| 606 | * message digest API calls. During
|
| 607 | * the allocation, the provided ahash handle
|
| 608 | * is registered in the request data structure.
|
| 609 | *
|
| 610 | * Return: allocated request handle in case of success, or NULL if out of memory
|
| 611 |
|
| 612 | static inline struct ahash_request *ahash_request_alloc_noprof(
|
| 613 | struct crypto_ahash *tfm, gfp_t gfp)
|
| 614 | {
|
| 615 | struct ahash_request *req;
|
| 616 |
|
| 617 | req = kmalloc_noprof(sizeof(struct ahash_request) +
|
| 618 | crypto_ahash_reqsize(tfm), gfp);
|
| 619 |
|
| 620 | if (likely(req))
|
| 621 | ahash_request_set_tfm(req, tfm);
|
| 622 |
|
| 623 | return req;
|
| 624 | }
|
| 625 | #define ahash_request_alloc(...) alloc_hooks(ahash_request_alloc_noprof(__VA_ARGS__))
|
| 626 |
|
| 627 | |
| 628 | * ahash_request_free() - zeroize and free the request data structure
|
| 629 | * @req: request data structure cipher handle to be freed
|
| 630 |
|
| 631 | void ahash_request_free(struct ahash_request *req);
|
| 632 |
|
| 633 | static inline void ahash_request_zero(struct ahash_request *req)
|
| 634 | {
|
| 635 | memzero_explicit(req, sizeof(*req) +
|
| 636 | crypto_ahash_reqsize(crypto_ahash_reqtfm(req)));
|
| 637 | }
|
| 638 |
|
| 639 | static inline struct ahash_request *ahash_request_cast(
|
| 640 | struct crypto_async_request *req)
|
| 641 | {
|
| 642 | return container_of(req, struct ahash_request, base);
|
| 643 | }
|
| 644 |
|
| 645 | |
| 646 | * ahash_request_set_callback() - set asynchronous callback function
|
| 647 | * @req: request handle
|
| 648 | * @flags: specify zero or an ORing of the flags
|
| 649 | * CRYPTO_TFM_REQ_MAY_BACKLOG the request queue may back log and
|
| 650 | * increase the wait queue beyond the initial maximum size;
|
| 651 | * CRYPTO_TFM_REQ_MAY_SLEEP the request processing may sleep
|
| 652 | * @compl: callback function pointer to be registered with the request handle
|
| 653 | * @data: The data pointer refers to memory that is not used by the kernel
|
| 654 | * crypto API, but provided to the callback function for it to use. Here,
|
| 655 | * the caller can provide a reference to memory the callback function can
|
| 656 | * operate on. As the callback function is invoked asynchronously to the
|
| 657 | * related functionality, it may need to access data structures of the
|
| 658 | * related functionality which can be referenced using this pointer. The
|
| 659 | * callback function can access the memory via the "data" field in the
|
| 660 | * &crypto_async_request data structure provided to the callback function.
|
| 661 | *
|
| 662 | * This function allows setting the callback function that is triggered once
|
| 663 | * the cipher operation completes.
|
| 664 | *
|
| 665 | * The callback function is registered with the &ahash_request handle and
|
| 666 | * must comply with the following template::
|
| 667 | *
|
| 668 | * void callback_function(struct crypto_async_request *req, int error)
|
| 669 |
|
| 670 | static inline void ahash_request_set_callback(struct ahash_request *req,
|
| 671 | u32 flags,
|
| 672 | crypto_completion_t compl,
|
| 673 | void *data)
|
| 674 | {
|
| 675 | flags &= ~CRYPTO_AHASH_REQ_PRIVATE;
|
| 676 | flags |= req->base.flags & CRYPTO_AHASH_REQ_PRIVATE;
|
| 677 | crypto_request_set_callback(&req->base, flags, compl, data);
|
| 678 | }
|
| 679 |
|
| 680 | |
| 681 | * ahash_request_set_crypt() - set data buffers
|
| 682 | * @req: ahash_request handle to be updated
|
| 683 | * @src: source scatter/gather list
|
| 684 | * @result: buffer that is filled with the message digest -- the caller must
|
| 685 | * ensure that the buffer has sufficient space by, for example, calling
|
| 686 | * crypto_ahash_digestsize()
|
| 687 | * @nbytes: number of bytes to process from the source scatter/gather list
|
| 688 | *
|
| 689 | * By using this call, the caller references the source scatter/gather list.
|
| 690 | * The source scatter/gather list points to the data the message digest is to
|
| 691 | * be calculated for.
|
| 692 |
|
| 693 | static inline void ahash_request_set_crypt(struct ahash_request *req,
|
| 694 | struct scatterlist *src, u8 *result,
|
| 695 | unsigned int nbytes)
|
| 696 | {
|
| 697 | req->src = src;
|
| 698 | req->nbytes = nbytes;
|
| 699 | req->result = result;
|
| 700 | req->base.flags &= ~CRYPTO_AHASH_REQ_VIRT;
|
| 701 | }
|
| 702 |
|
| 703 | |
| 704 | * ahash_request_set_virt() - set virtual address data buffers
|
| 705 | * @req: ahash_request handle to be updated
|
| 706 | * @src: source virtual address
|
| 707 | * @result: buffer that is filled with the message digest -- the caller must
|
| 708 | * ensure that the buffer has sufficient space by, for example, calling
|
| 709 | * crypto_ahash_digestsize()
|
| 710 | * @nbytes: number of bytes to process from the source virtual address
|
| 711 | *
|
| 712 | * By using this call, the caller references the source virtual address.
|
| 713 | * The source virtual address points to the data the message digest is to
|
| 714 | * be calculated for.
|
| 715 |
|
| 716 | static inline void ahash_request_set_virt(struct ahash_request *req,
|
| 717 | const u8 *src, u8 *result,
|
| 718 | unsigned int nbytes)
|
| 719 | {
|
| 720 | req->svirt = src;
|
| 721 | req->nbytes = nbytes;
|
| 722 | req->result = result;
|
| 723 | req->base.flags |= CRYPTO_AHASH_REQ_VIRT;
|
| 724 | }
|
| 725 |
|
| 726 | |
| 727 | * DOC: Synchronous Message Digest API
|
| 728 | *
|
| 729 | * The synchronous message digest API is used with the ciphers of type
|
| 730 | * CRYPTO_ALG_TYPE_SHASH (listed as type "shash" in /proc/crypto)
|
| 731 | *
|
| 732 | * The message digest API is able to maintain state information for the
|
| 733 | * caller.
|
| 734 | *
|
| 735 | * The synchronous message digest API can store user-related context in its
|
| 736 | * shash_desc request data structure.
|
| 737 |
|
| 738 |
|
| 739 | |
| 740 | * crypto_alloc_shash() - allocate message digest handle
|
| 741 | * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
|
| 742 | * message digest cipher
|
| 743 | * @type: specifies the type of the cipher
|
| 744 | * @mask: specifies the mask for the cipher
|
| 745 | *
|
| 746 | * Allocate a cipher handle for a message digest. The returned &struct
|
| 747 | * crypto_shash is the cipher handle that is required for any subsequent
|
| 748 | * API invocation for that message digest.
|
| 749 | *
|
| 750 | * Return: allocated cipher handle in case of success; IS_ERR() is true in case
|
| 751 | * of an error, PTR_ERR() returns the error code.
|
| 752 |
|
| 753 | struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
|
| 754 | u32 mask);
|
| 755 |
|
| 756 | int crypto_has_shash(const char *alg_name, u32 type, u32 mask);
|
| 757 |
|
| 758 | static inline struct crypto_tfm *crypto_shash_tfm(struct crypto_shash *tfm)
|
| 759 | {
|
| 760 | return &tfm->base;
|
| 761 | }
|
| 762 |
|
| 763 | |
| 764 | * crypto_free_shash() - zeroize and free the message digest handle
|
| 765 | * @tfm: cipher handle to be freed
|
| 766 | *
|
| 767 | * If @tfm is a NULL or error pointer, this function does nothing.
|
| 768 |
|
| 769 | static inline void crypto_free_shash(struct crypto_shash *tfm)
|
| 770 | {
|
| 771 | crypto_destroy_tfm(tfm, crypto_shash_tfm(tfm));
|
| 772 | }
|
| 773 |
|
| 774 | static inline const char *crypto_shash_alg_name(struct crypto_shash *tfm)
|
| 775 | {
|
| 776 | return crypto_tfm_alg_name(crypto_shash_tfm(tfm));
|
| 777 | }
|
| 778 |
|
| 779 | static inline const char *crypto_shash_driver_name(struct crypto_shash *tfm)
|
| 780 | {
|
| 781 | return crypto_tfm_alg_driver_name(crypto_shash_tfm(tfm));
|
| 782 | }
|
| 783 |
|
| 784 | |
| 785 | * crypto_shash_blocksize() - obtain block size for cipher
|
| 786 | * @tfm: cipher handle
|
| 787 | *
|
| 788 | * The block size for the message digest cipher referenced with the cipher
|
| 789 | * handle is returned.
|
| 790 | *
|
| 791 | * Return: block size of cipher
|
| 792 |
|
| 793 | static inline unsigned int crypto_shash_blocksize(struct crypto_shash *tfm)
|
| 794 | {
|
| 795 | return crypto_tfm_alg_blocksize(crypto_shash_tfm(tfm));
|
| 796 | }
|
| 797 |
|
| 798 | static inline struct shash_alg *__crypto_shash_alg(struct crypto_alg *alg)
|
| 799 | {
|
| 800 | return container_of(alg, struct shash_alg, base);
|
| 801 | }
|
| 802 |
|
| 803 | static inline struct shash_alg *crypto_shash_alg(struct crypto_shash *tfm)
|
| 804 | {
|
| 805 | return __crypto_shash_alg(crypto_shash_tfm(tfm)->__crt_alg);
|
| 806 | }
|
| 807 |
|
| 808 | |
| 809 | * crypto_shash_digestsize() - obtain message digest size
|
| 810 | * @tfm: cipher handle
|
| 811 | *
|
| 812 | * The size for the message digest created by the message digest cipher
|
| 813 | * referenced with the cipher handle is returned.
|
| 814 | *
|
| 815 | * Return: digest size of cipher
|
| 816 |
|
| 817 | static inline unsigned int crypto_shash_digestsize(struct crypto_shash *tfm)
|
| 818 | {
|
| 819 | return crypto_shash_alg(tfm)->digestsize;
|
| 820 | }
|
| 821 |
|
| 822 | static inline unsigned int crypto_shash_statesize(struct crypto_shash *tfm)
|
| 823 | {
|
| 824 | return crypto_shash_alg(tfm)->statesize;
|
| 825 | }
|
| 826 |
|
| 827 | static inline u32 crypto_shash_get_flags(struct crypto_shash *tfm)
|
| 828 | {
|
| 829 | return crypto_tfm_get_flags(crypto_shash_tfm(tfm));
|
| 830 | }
|
| 831 |
|
| 832 | static inline void crypto_shash_set_flags(struct crypto_shash *tfm, u32 flags)
|
| 833 | {
|
| 834 | crypto_tfm_set_flags(crypto_shash_tfm(tfm), flags);
|
| 835 | }
|
| 836 |
|
| 837 | static inline void crypto_shash_clear_flags(struct crypto_shash *tfm, u32 flags)
|
| 838 | {
|
| 839 | crypto_tfm_clear_flags(crypto_shash_tfm(tfm), flags);
|
| 840 | }
|
| 841 |
|
| 842 | |
| 843 | * crypto_shash_descsize() - obtain the operational state size
|
| 844 | * @tfm: cipher handle
|
| 845 | *
|
| 846 | * The size of the operational state the cipher needs during operation is
|
| 847 | * returned for the hash referenced with the cipher handle. This size is
|
| 848 | * required to calculate the memory requirements to allow the caller allocating
|
| 849 | * sufficient memory for operational state.
|
| 850 | *
|
| 851 | * The operational state is defined with struct shash_desc where the size of
|
| 852 | * that data structure is to be calculated as
|
| 853 | * sizeof(struct shash_desc) + crypto_shash_descsize(alg)
|
| 854 | *
|
| 855 | * Return: size of the operational state
|
| 856 |
|
| 857 | static inline unsigned int crypto_shash_descsize(struct crypto_shash *tfm)
|
| 858 | {
|
| 859 | return crypto_shash_alg(tfm)->descsize;
|
| 860 | }
|
| 861 |
|
| 862 | static inline void *shash_desc_ctx(struct shash_desc *desc)
|
| 863 | {
|
| 864 | return desc->__ctx;
|
| 865 | }
|
| 866 |
|
| 867 | |
| 868 | * crypto_shash_setkey() - set key for message digest
|
| 869 | * @tfm: cipher handle
|
| 870 | * @key: buffer holding the key
|
| 871 | * @keylen: length of the key in bytes
|
| 872 | *
|
| 873 | * The caller provided key is set for the keyed message digest cipher. The
|
| 874 | * cipher handle must point to a keyed message digest cipher in order for this
|
| 875 | * function to succeed.
|
| 876 | *
|
| 877 | * Context: Softirq or process context.
|
| 878 | * Return: 0 if the setting of the key was successful; < 0 if an error occurred
|
| 879 |
|
| 880 | int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
|
| 881 | unsigned int keylen);
|
| 882 |
|
| 883 | |
| 884 | * crypto_shash_digest() - calculate message digest for buffer
|
| 885 | * @desc: see crypto_shash_final()
|
| 886 | * @data: see crypto_shash_update()
|
| 887 | * @len: see crypto_shash_update()
|
| 888 | * @out: see crypto_shash_final()
|
| 889 | *
|
| 890 | * This function is a "short-hand" for the function calls of crypto_shash_init,
|
| 891 | * crypto_shash_update and crypto_shash_final. The parameters have the same
|
| 892 | * meaning as discussed for those separate three functions.
|
| 893 | *
|
| 894 | * Context: Softirq or process context.
|
| 895 | * Return: 0 if the message digest creation was successful; < 0 if an error
|
| 896 | * occurred
|
| 897 |
|
| 898 | int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
|
| 899 | unsigned int len, u8 *out);
|
| 900 |
|
| 901 | |
| 902 | * crypto_shash_tfm_digest() - calculate message digest for buffer
|
| 903 | * @tfm: hash transformation object
|
| 904 | * @data: see crypto_shash_update()
|
| 905 | * @len: see crypto_shash_update()
|
| 906 | * @out: see crypto_shash_final()
|
| 907 | *
|
| 908 | * This is a simplified version of crypto_shash_digest() for users who don't
|
| 909 | * want to allocate their own hash descriptor (shash_desc). Instead,
|
| 910 | * crypto_shash_tfm_digest() takes a hash transformation object (crypto_shash)
|
| 911 | * directly, and it allocates a hash descriptor on the stack internally.
|
| 912 | * Note that this stack allocation may be fairly large.
|
| 913 | *
|
| 914 | * Context: Softirq or process context.
|
| 915 | * Return: 0 on success; < 0 if an error occurred.
|
| 916 |
|
| 917 | int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data,
|
| 918 | unsigned int len, u8 *out);
|
| 919 |
|
| 920 | int crypto_hash_digest(struct crypto_ahash *tfm, const u8 *data,
|
| 921 | unsigned int len, u8 *out);
|
| 922 |
|
| 923 | |
| 924 | * crypto_shash_export() - extract operational state for message digest
|
| 925 | * @desc: reference to the operational state handle whose state is exported
|
| 926 | * @out: output buffer of sufficient size that can hold the hash state
|
| 927 | *
|
| 928 | * This function exports the hash state of the operational state handle into the
|
| 929 | * caller-allocated output buffer out which must have sufficient size (e.g. by
|
| 930 | * calling crypto_shash_descsize).
|
| 931 | *
|
| 932 | * Context: Softirq or process context.
|
| 933 | * Return: 0 if the export creation was successful; < 0 if an error occurred
|
| 934 |
|
| 935 | int crypto_shash_export(struct shash_desc *desc, void *out);
|
| 936 |
|
| 937 | |
| 938 | * crypto_shash_import() - import operational state
|
| 939 | * @desc: reference to the operational state handle the state imported into
|
| 940 | * @in: buffer holding the state
|
| 941 | *
|
| 942 | * This function imports the hash state into the operational state handle from
|
| 943 | * the input buffer. That buffer should have been generated with the
|
| 944 | * crypto_ahash_export function.
|
| 945 | *
|
| 946 | * Context: Softirq or process context.
|
| 947 | * Return: 0 if the import was successful; < 0 if an error occurred
|
| 948 |
|
| 949 | int crypto_shash_import(struct shash_desc *desc, const void *in);
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| 950 |
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| 951 | |
| 952 | * crypto_shash_init() - (re)initialize message digest
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| 953 | * @desc: operational state handle that is already filled
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| 954 | *
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| 955 | * The call (re-)initializes the message digest referenced by the
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| 956 | * operational state handle. Any potentially existing state created by
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| 957 | * previous operations is discarded.
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| 958 | *
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| 959 | * Context: Softirq or process context.
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| 960 | * Return: 0 if the message digest initialization was successful; < 0 if an
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| 961 | * error occurred
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| 962 |
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| 963 | int crypto_shash_init(struct shash_desc *desc);
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| 964 |
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| 965 | |
| 966 | * crypto_shash_finup() - calculate message digest of buffer
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| 967 | * @desc: see crypto_shash_final()
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| 968 | * @data: see crypto_shash_update()
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| 969 | * @len: see crypto_shash_update()
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| 970 | * @out: see crypto_shash_final()
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| 971 | *
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| 972 | * This function is a "short-hand" for the function calls of
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| 973 | * crypto_shash_update and crypto_shash_final. The parameters have the same
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| 974 | * meaning as discussed for those separate functions.
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| 975 | *
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| 976 | * Context: Softirq or process context.
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| 977 | * Return: 0 if the message digest creation was successful; < 0 if an error
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| 978 | * occurred
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| 979 |
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| 980 | int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
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| 981 | unsigned int len, u8 *out);
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| 982 |
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| 983 | |
| 984 | * crypto_shash_update() - add data to message digest for processing
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| 985 | * @desc: operational state handle that is already initialized
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| 986 | * @data: input data to be added to the message digest
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| 987 | * @len: length of the input data
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| 988 | *
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| 989 | * Updates the message digest state of the operational state handle.
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| 990 | *
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| 991 | * Context: Softirq or process context.
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| 992 | * Return: 0 if the message digest update was successful; < 0 if an error
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| 993 | * occurred
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| 994 |
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| 995 | static inline int crypto_shash_update(struct shash_desc *desc, const u8 *data,
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| 996 | unsigned int len)
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| 997 | {
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| 998 | return crypto_shash_finup(desc, data, len, NULL);
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| 999 | }
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| 1000 |
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| 1001 | |
| 1002 | * crypto_shash_final() - calculate message digest
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| 1003 | * @desc: operational state handle that is already filled with data
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| 1004 | * @out: output buffer filled with the message digest
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| 1005 | *
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| 1006 | * Finalize the message digest operation and create the message digest
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| 1007 | * based on all data added to the cipher handle. The message digest is placed
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| 1008 | * into the output buffer. The caller must ensure that the output buffer is
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| 1009 | * large enough by using crypto_shash_digestsize.
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| 1010 | *
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| 1011 | * Context: Softirq or process context.
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| 1012 | * Return: 0 if the message digest creation was successful; < 0 if an error
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| 1013 | * occurred
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| 1014 |
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| 1015 | static inline int crypto_shash_final(struct shash_desc *desc, u8 *out)
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| 1016 | {
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| 1017 | return crypto_shash_finup(desc, NULL, 0, out);
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| 1018 | }
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| 1019 |
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| 1020 | static inline void shash_desc_zero(struct shash_desc *desc)
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| 1021 | {
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| 1022 | memzero_explicit(desc,
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| 1023 | sizeof(*desc) + crypto_shash_descsize(desc->tfm));
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| 1024 | }
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| 1025 |
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| 1026 | static inline bool ahash_is_async(struct crypto_ahash *tfm)
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| 1027 | {
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| 1028 | return crypto_tfm_is_async(&tfm->base);
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| 1029 | }
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| 1030 |
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| 1031 | static inline struct ahash_request *ahash_request_on_stack_init(
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| 1032 | char *buf, struct crypto_ahash *tfm)
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| 1033 | {
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| 1034 | struct ahash_request *req = (void *)buf;
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| 1035 |
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| 1036 | crypto_stack_request_init(&req->base, crypto_ahash_tfm(tfm));
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| 1037 | return req;
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| 1038 | }
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| 1039 |
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| 1040 | static inline struct ahash_request *ahash_request_clone(
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| 1041 | struct ahash_request *req, size_t total, gfp_t gfp)
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| 1042 | {
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| 1043 | return container_of(crypto_request_clone(&req->base, total, gfp),
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| 1044 | struct ahash_request, base);
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| 1045 | }
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| 1046 |
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| 1047 | #endif
|