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6 * it under the terms of the GNU General Public License version 2 only,
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9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License version 2 for more details (a copy is included
13 * in the LICENSE file that accompanied this code).
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25 * Copyright 2012 Xyratex Technology Limited
27 * Copyright (c) 2012, 2014, Intel Corporation.
30 #include <crypto/hash.h>
31 #include <linux/scatterlist.h>
32 #include <linux/pagemap.h>
33 #include <libcfs/libcfs.h>
34 #include <libcfs/libcfs_crypto.h>
35 #include "linux-crypto.h"
37 #ifndef HAVE_CRYPTO_HASH_HELPERS
38 static inline const char *crypto_ahash_alg_name(struct crypto_ahash *tfm)
40 return crypto_tfm_alg_name(crypto_ahash_tfm(tfm));
43 static inline const char *crypto_ahash_driver_name(struct crypto_ahash *tfm)
45 return crypto_tfm_alg_driver_name(crypto_ahash_tfm(tfm));
50 * Array of hash algorithm speed in MByte per second
52 static int cfs_crypto_hash_speeds[CFS_HASH_ALG_MAX];
55 * Initialize the state descriptor for the specified hash algorithm.
57 * An internal routine to allocate the hash-specific state in \a hdesc for
58 * use with cfs_crypto_hash_digest() to compute the hash of a single message,
59 * though possibly in multiple chunks. The descriptor internal state should
60 * be freed with cfs_crypto_hash_final().
62 * \param[in] hash_alg hash algorithm id (CFS_HASH_ALG_*)
63 * \param[out] type pointer to the hash description in hash_types[] array
64 * \param[in,out] req ahash request to be initialized
65 * \param[in] key initial hash value/state, NULL to use default value
66 * \param[in] key_len length of \a key
68 * \retval 0 on success
69 * \retval negative errno on failure
71 static int cfs_crypto_hash_alloc(enum cfs_crypto_hash_alg hash_alg,
72 const struct cfs_crypto_hash_type **type,
73 struct ahash_request **req,
77 struct crypto_ahash *tfm;
80 *type = cfs_crypto_hash_type(hash_alg);
82 CWARN("Unsupported hash algorithm id = %d, max id is %d\n",
83 hash_alg, CFS_HASH_ALG_MAX);
87 /* Keys are only supported for the hmac version */
88 if (key && key_len > 0) {
91 algo_name = kasprintf(GFP_KERNEL, "hmac(%s)",
96 tfm = crypto_alloc_ahash(algo_name, 0, CRYPTO_ALG_ASYNC);
99 tfm = crypto_alloc_ahash((*type)->cht_name, 0,
103 CDEBUG_LIMIT(PTR_ERR(tfm) == -ENOMEM ? D_ERROR : D_INFO,
104 "Failed to alloc crypto hash %s: rc = %d\n",
105 (*type)->cht_name, (int)PTR_ERR(tfm));
109 *req = ahash_request_alloc(tfm, GFP_KERNEL);
111 CDEBUG(D_INFO, "Failed to alloc ahash_request for %s\n",
113 GOTO(out_free_tfm, err = -ENOMEM);
116 ahash_request_set_callback(*req, 0, NULL, NULL);
119 err = crypto_ahash_setkey(tfm, key, key_len);
120 else if ((*type)->cht_key != 0)
121 err = crypto_ahash_setkey(tfm,
122 (unsigned char *)&((*type)->cht_key),
125 GOTO(out_free_req, err);
127 CDEBUG(D_INFO, "Using crypto hash: %s (%s) speed %d MB/s\n",
128 crypto_ahash_alg_name(tfm), crypto_ahash_driver_name(tfm),
129 cfs_crypto_hash_speeds[hash_alg]);
131 err = crypto_ahash_init(*req);
134 ahash_request_free(*req);
136 crypto_free_ahash(tfm);
142 * Calculate hash digest for the passed buffer.
144 * This should be used when computing the hash on a single contiguous buffer.
145 * It combines the hash initialization, computation, and cleanup.
147 * \param[in] hash_alg id of hash algorithm (CFS_HASH_ALG_*)
148 * \param[in] buf data buffer on which to compute hash
149 * \param[in] buf_len length of \a buf in bytes
150 * \param[in] key initial value/state for algorithm, if \a key = NULL
151 * use default initial value
152 * \param[in] key_len length of \a key in bytes
153 * \param[out] hash pointer to computed hash value, if \a hash = NULL then
154 * \a hash_len is to digest size in bytes, retval -ENOSPC
155 * \param[in,out] hash_len size of \a hash buffer
157 * \retval -EINVAL \a buf, \a buf_len, \a hash_len, \a hash_alg invalid
158 * \retval -ENOENT \a hash_alg is unsupported
159 * \retval -ENOSPC \a hash is NULL, or \a hash_len less than digest size
160 * \retval 0 for success
161 * \retval negative errno for other errors from lower layers.
163 int cfs_crypto_hash_digest(enum cfs_crypto_hash_alg hash_alg,
164 const void *buf, unsigned int buf_len,
165 unsigned char *key, unsigned int key_len,
166 unsigned char *hash, unsigned int *hash_len)
168 struct scatterlist sl;
169 struct ahash_request *req;
171 const struct cfs_crypto_hash_type *type;
173 if (!buf || buf_len == 0 || !hash_len)
176 err = cfs_crypto_hash_alloc(hash_alg, &type, &req, key, key_len);
180 if (!hash || *hash_len < type->cht_size) {
181 *hash_len = type->cht_size;
182 crypto_free_ahash(crypto_ahash_reqtfm(req));
183 ahash_request_free(req);
186 sg_init_one(&sl, (void *)buf, buf_len);
188 ahash_request_set_crypt(req, &sl, hash, sl.length);
189 err = crypto_ahash_digest(req);
190 crypto_free_ahash(crypto_ahash_reqtfm(req));
191 ahash_request_free(req);
195 EXPORT_SYMBOL(cfs_crypto_hash_digest);
198 * Allocate and initialize desriptor for hash algorithm.
200 * This should be used to initialize a hash descriptor for multiple calls
201 * to a single hash function when computing the hash across multiple
202 * separate buffers or pages using cfs_crypto_hash_update{,_page}().
204 * The hash descriptor should be freed with cfs_crypto_hash_final().
206 * \param[in] hash_alg algorithm id (CFS_HASH_ALG_*)
207 * \param[in] key initial value/state for algorithm, if \a key = NULL
208 * use default initial value
209 * \param[in] key_len length of \a key in bytes
211 * \retval pointer to ahash request
212 * \retval ERR_PTR(errno) in case of error
214 struct ahash_request *
215 cfs_crypto_hash_init(enum cfs_crypto_hash_alg hash_alg,
216 unsigned char *key, unsigned int key_len)
218 struct ahash_request *req;
220 const struct cfs_crypto_hash_type *type;
222 err = cfs_crypto_hash_alloc(hash_alg, &type, &req, key, key_len);
227 EXPORT_SYMBOL(cfs_crypto_hash_init);
230 * Update hash digest computed on data within the given \a page
232 * \param[in] req ahash request
233 * \param[in] page data page on which to compute the hash
234 * \param[in] offset offset within \a page at which to start hash
235 * \param[in] len length of data on which to compute hash
237 * \retval 0 for success
238 * \retval negative errno on failure
240 int cfs_crypto_hash_update_page(struct ahash_request *req,
241 struct page *page, unsigned int offset,
244 struct scatterlist sl;
246 sg_init_table(&sl, 1);
247 sg_set_page(&sl, page, len, offset & ~PAGE_MASK);
249 ahash_request_set_crypt(req, &sl, NULL, sl.length);
250 return crypto_ahash_update(req);
252 EXPORT_SYMBOL(cfs_crypto_hash_update_page);
255 * Update hash digest computed on the specified data
257 * \param[in] req ahash request
258 * \param[in] buf data buffer on which to compute the hash
259 * \param[in] buf_len length of \buf on which to compute hash
261 * \retval 0 for success
262 * \retval negative errno on failure
264 int cfs_crypto_hash_update(struct ahash_request *req,
265 const void *buf, unsigned int buf_len)
267 struct scatterlist sl;
269 sg_init_one(&sl, (void *)buf, buf_len);
271 ahash_request_set_crypt(req, &sl, NULL, sl.length);
272 return crypto_ahash_update(req);
274 EXPORT_SYMBOL(cfs_crypto_hash_update);
277 * Finish hash calculation, copy hash digest to buffer, clean up hash descriptor
279 * \param[in] req ahash request
280 * \param[out] hash pointer to hash buffer to store hash digest
281 * \param[in,out] hash_len pointer to hash buffer size, if \a hash == NULL
282 * or hash_len == NULL only free \a hdesc instead
283 * of computing the hash
285 * \retval 0 for success
286 * \retval -EOVERFLOW if hash_len is too small for the hash digest
287 * \retval negative errno for other errors from lower layers
289 int cfs_crypto_hash_final(struct ahash_request *req,
290 unsigned char *hash, unsigned int *hash_len)
292 int size = crypto_ahash_digestsize(crypto_ahash_reqtfm(req));
295 if (!hash || !hash_len) {
299 if (*hash_len < size) {
304 ahash_request_set_crypt(req, NULL, hash, 0);
305 err = crypto_ahash_final(req);
309 crypto_free_ahash(crypto_ahash_reqtfm(req));
310 ahash_request_free(req);
314 EXPORT_SYMBOL(cfs_crypto_hash_final);
317 * Compute the speed of specified hash function
319 * Run a speed test on the given hash algorithm on buffer using a 1MB buffer
320 * size. This is a reasonable buffer size for Lustre RPCs, even if the actual
321 * RPC size is larger or smaller.
323 * The speed is stored internally in the cfs_crypto_hash_speeds[] array, and
324 * is available through the cfs_crypto_hash_speed() function.
326 * This function needs to stay the same as obd_t10_performance_test() so that
327 * the speeds are comparable.
329 * \param[in] hash_alg hash algorithm id (CFS_HASH_ALG_*)
330 * \param[in] buf data buffer on which to compute the hash
331 * \param[in] buf_len length of \buf on which to compute hash
333 static void cfs_crypto_performance_test(enum cfs_crypto_hash_alg hash_alg)
335 int buf_len = max(PAGE_SIZE, 1048576UL);
337 unsigned long start, end;
339 unsigned long bcount;
341 unsigned char hash[CFS_CRYPTO_HASH_DIGESTSIZE_MAX];
342 unsigned int hash_len = sizeof(hash);
344 page = alloc_page(GFP_KERNEL);
351 memset(buf, 0xAD, PAGE_SIZE);
354 for (start = jiffies, end = start + cfs_time_seconds(1) / 4,
355 bcount = 0; time_before(jiffies, end) && err == 0; bcount++) {
356 struct ahash_request *req;
359 req = cfs_crypto_hash_init(hash_alg, NULL, 0);
365 for (i = 0; i < buf_len / PAGE_SIZE; i++) {
366 err = cfs_crypto_hash_update_page(req, page, 0,
372 err = cfs_crypto_hash_final(req, hash, &hash_len);
380 cfs_crypto_hash_speeds[hash_alg] = err;
381 CDEBUG(D_INFO, "Crypto hash algorithm %s test error: rc = %d\n",
382 cfs_crypto_hash_name(hash_alg), err);
386 tmp = ((bcount * buf_len / jiffies_to_msecs(end - start)) *
387 1000) / (1024 * 1024);
388 cfs_crypto_hash_speeds[hash_alg] = (int)tmp;
389 CDEBUG(D_CONFIG, "Crypto hash algorithm %s speed = %d MB/s\n",
390 cfs_crypto_hash_name(hash_alg),
391 cfs_crypto_hash_speeds[hash_alg]);
396 * hash speed in Mbytes per second for valid hash algorithm
398 * Return the performance of the specified \a hash_alg that was
399 * computed using cfs_crypto_performance_test(). If the performance
400 * has not yet been computed, do that when it is first requested.
401 * That avoids computing the speed when it is not actually needed.
402 * To avoid competing threads computing the checksum speed at the
403 * same time, only compute a single checksum speed at one time.
405 * \param[in] hash_alg hash algorithm id (CFS_HASH_ALG_*)
407 * \retval positive speed of the hash function in MB/s
408 * \retval -ENOENT if \a hash_alg is unsupported
409 * \retval negative errno if \a hash_alg speed is unavailable
411 int cfs_crypto_hash_speed(enum cfs_crypto_hash_alg hash_alg)
413 if (hash_alg < CFS_HASH_ALG_MAX) {
414 if (unlikely(cfs_crypto_hash_speeds[hash_alg] == 0)) {
415 static DEFINE_MUTEX(crypto_hash_speed_mutex);
417 mutex_lock(&crypto_hash_speed_mutex);
418 if (cfs_crypto_hash_speeds[hash_alg] == 0)
419 cfs_crypto_performance_test(hash_alg);
420 mutex_unlock(&crypto_hash_speed_mutex);
422 return cfs_crypto_hash_speeds[hash_alg];
427 EXPORT_SYMBOL(cfs_crypto_hash_speed);
430 * Run the performance test for all hash algorithms.
432 * Run the cfs_crypto_performance_test() benchmark for some of the available
433 * hash functions at module load time. This can't be reliably done at runtime
434 * since the CPUs may be under load from thousands of connecting clients when
435 * the first client connects and the checksum speeds are needed.
437 * Since the setup cost and computation speed of various hash algorithms is
438 * a function of the buffer size (and possibly internal contention of offload
439 * engines), this speed only represents an estimate of the actual speed under
440 * actual usage, but is reasonable for comparing available algorithms.
442 * The actual speeds are available via cfs_crypto_hash_speed() for later
445 * \retval 0 on success
446 * \retval -ENOMEM if no memory is available for test buffer
448 static int cfs_crypto_test_hashes(void)
450 enum cfs_crypto_hash_alg hash_alg;
452 for (hash_alg = 1; hash_alg < CFS_HASH_ALG_SPEED_MAX; hash_alg++)
453 cfs_crypto_performance_test(hash_alg);
461 * Register available hash functions
465 int cfs_crypto_register(void)
467 request_module("crc32c");
469 if (cfs_crypto_adler32_register() == 0)
472 /* check all algorithms and do performance test */
473 cfs_crypto_test_hashes();
479 * Unregister previously registered hash functions
481 void cfs_crypto_unregister(void)
484 cfs_crypto_adler32_unregister();