diff options
author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-06-10 05:30:17 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-06-10 05:30:17 -0300 |
commit | d635711daa98be86d4c7fd01499c34f566b54ccb (patch) | |
tree | aa5cc3760a27c3d57146498cb82fa549547de06c /drivers/staging/lustre/lnet/libcfs/linux/linux-crypto.c | |
parent | c91265cd0efb83778f015b4d4b1129bd2cfd075e (diff) |
Linux-libre 4.6.2-gnu
Diffstat (limited to 'drivers/staging/lustre/lnet/libcfs/linux/linux-crypto.c')
-rw-r--r-- | drivers/staging/lustre/lnet/libcfs/linux/linux-crypto.c | 297 |
1 files changed, 297 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lnet/libcfs/linux/linux-crypto.c b/drivers/staging/lustre/lnet/libcfs/linux/linux-crypto.c new file mode 100644 index 000000000..8c9377ed8 --- /dev/null +++ b/drivers/staging/lustre/lnet/libcfs/linux/linux-crypto.c @@ -0,0 +1,297 @@ +/* GPL HEADER START + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 only, + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License version 2 for more details (a copy is included + * in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU General Public License + * version 2 along with this program; If not, see http://www.gnu.org/licenses + * + * Please visit http://www.xyratex.com/contact if you need additional + * information or have any questions. + * + * GPL HEADER END + */ + +/* + * Copyright 2012 Xyratex Technology Limited + * + * Copyright (c) 2012, Intel Corporation. + */ + +#include <crypto/hash.h> +#include <linux/scatterlist.h> +#include "../../../include/linux/libcfs/libcfs.h" +#include "linux-crypto.h" +/** + * Array of hash algorithm speed in MByte per second + */ +static int cfs_crypto_hash_speeds[CFS_HASH_ALG_MAX]; + +static int cfs_crypto_hash_alloc(unsigned char alg_id, + const struct cfs_crypto_hash_type **type, + struct ahash_request **req, + unsigned char *key, + unsigned int key_len) +{ + struct crypto_ahash *tfm; + int err = 0; + + *type = cfs_crypto_hash_type(alg_id); + + if (!*type) { + CWARN("Unsupported hash algorithm id = %d, max id is %d\n", + alg_id, CFS_HASH_ALG_MAX); + return -EINVAL; + } + tfm = crypto_alloc_ahash((*type)->cht_name, 0, CRYPTO_ALG_ASYNC); + + if (IS_ERR(tfm)) { + CDEBUG(D_INFO, "Failed to alloc crypto hash %s\n", + (*type)->cht_name); + return PTR_ERR(tfm); + } + + *req = ahash_request_alloc(tfm, GFP_KERNEL); + if (!*req) { + CDEBUG(D_INFO, "Failed to alloc ahash_request for %s\n", + (*type)->cht_name); + crypto_free_ahash(tfm); + return -ENOMEM; + } + + ahash_request_set_callback(*req, 0, NULL, NULL); + + /** Shash have different logic for initialization then digest + * shash: crypto_hash_setkey, crypto_hash_init + * digest: crypto_digest_init, crypto_digest_setkey + * Skip this function for digest, because we use shash logic at + * cfs_crypto_hash_alloc. + */ + if (key) + err = crypto_ahash_setkey(tfm, key, key_len); + else if ((*type)->cht_key != 0) + err = crypto_ahash_setkey(tfm, + (unsigned char *)&((*type)->cht_key), + (*type)->cht_size); + + if (err != 0) { + crypto_free_ahash(tfm); + return err; + } + + CDEBUG(D_INFO, "Using crypto hash: %s (%s) speed %d MB/s\n", + crypto_ahash_alg_name(tfm), crypto_ahash_driver_name(tfm), + cfs_crypto_hash_speeds[alg_id]); + + err = crypto_ahash_init(*req); + if (err) { + ahash_request_free(*req); + crypto_free_ahash(tfm); + } + return err; +} + +int cfs_crypto_hash_digest(unsigned char alg_id, + const void *buf, unsigned int buf_len, + unsigned char *key, unsigned int key_len, + unsigned char *hash, unsigned int *hash_len) +{ + struct scatterlist sl; + struct ahash_request *req; + int err; + const struct cfs_crypto_hash_type *type; + + if (!buf || buf_len == 0 || !hash_len) + return -EINVAL; + + err = cfs_crypto_hash_alloc(alg_id, &type, &req, key, key_len); + if (err != 0) + return err; + + if (!hash || *hash_len < type->cht_size) { + *hash_len = type->cht_size; + crypto_free_ahash(crypto_ahash_reqtfm(req)); + ahash_request_free(req); + return -ENOSPC; + } + sg_init_one(&sl, buf, buf_len); + + ahash_request_set_crypt(req, &sl, hash, sl.length); + err = crypto_ahash_digest(req); + crypto_free_ahash(crypto_ahash_reqtfm(req)); + ahash_request_free(req); + + return err; +} +EXPORT_SYMBOL(cfs_crypto_hash_digest); + +struct cfs_crypto_hash_desc * + cfs_crypto_hash_init(unsigned char alg_id, + unsigned char *key, unsigned int key_len) +{ + struct ahash_request *req; + int err; + const struct cfs_crypto_hash_type *type; + + err = cfs_crypto_hash_alloc(alg_id, &type, &req, key, key_len); + + if (err) + return ERR_PTR(err); + return (struct cfs_crypto_hash_desc *)req; +} +EXPORT_SYMBOL(cfs_crypto_hash_init); + +int cfs_crypto_hash_update_page(struct cfs_crypto_hash_desc *hdesc, + struct page *page, unsigned int offset, + unsigned int len) +{ + struct ahash_request *req = (void *)hdesc; + struct scatterlist sl; + + sg_init_table(&sl, 1); + sg_set_page(&sl, page, len, offset & ~CFS_PAGE_MASK); + + ahash_request_set_crypt(req, &sl, NULL, sl.length); + return crypto_ahash_update(req); +} +EXPORT_SYMBOL(cfs_crypto_hash_update_page); + +int cfs_crypto_hash_update(struct cfs_crypto_hash_desc *hdesc, + const void *buf, unsigned int buf_len) +{ + struct ahash_request *req = (void *)hdesc; + struct scatterlist sl; + + sg_init_one(&sl, buf, buf_len); + + ahash_request_set_crypt(req, &sl, NULL, sl.length); + return crypto_ahash_update(req); +} +EXPORT_SYMBOL(cfs_crypto_hash_update); + +/* If hash_len pointer is NULL - destroy descriptor. */ +int cfs_crypto_hash_final(struct cfs_crypto_hash_desc *hdesc, + unsigned char *hash, unsigned int *hash_len) +{ + int err; + struct ahash_request *req = (void *)hdesc; + int size = crypto_ahash_digestsize(crypto_ahash_reqtfm(req)); + + if (!hash_len) { + crypto_free_ahash(crypto_ahash_reqtfm(req)); + ahash_request_free(req); + return 0; + } + if (!hash || *hash_len < size) { + *hash_len = size; + return -ENOSPC; + } + ahash_request_set_crypt(req, NULL, hash, 0); + err = crypto_ahash_final(req); + + if (err < 0) { + /* May be caller can fix error */ + return err; + } + crypto_free_ahash(crypto_ahash_reqtfm(req)); + ahash_request_free(req); + return err; +} +EXPORT_SYMBOL(cfs_crypto_hash_final); + +static void cfs_crypto_performance_test(unsigned char alg_id, + const unsigned char *buf, + unsigned int buf_len) +{ + unsigned long start, end; + int bcount, err = 0; + int sec = 1; /* do test only 1 sec */ + unsigned char hash[64]; + unsigned int hash_len = 64; + + for (start = jiffies, end = start + sec * HZ, bcount = 0; + time_before(jiffies, end); bcount++) { + err = cfs_crypto_hash_digest(alg_id, buf, buf_len, NULL, 0, + hash, &hash_len); + if (err) + break; + } + end = jiffies; + + if (err) { + cfs_crypto_hash_speeds[alg_id] = -1; + CDEBUG(D_INFO, "Crypto hash algorithm %s, err = %d\n", + cfs_crypto_hash_name(alg_id), err); + } else { + unsigned long tmp; + + tmp = ((bcount * buf_len / jiffies_to_msecs(end - start)) * + 1000) / (1024 * 1024); + cfs_crypto_hash_speeds[alg_id] = (int)tmp; + } + CDEBUG(D_INFO, "Crypto hash algorithm %s speed = %d MB/s\n", + cfs_crypto_hash_name(alg_id), cfs_crypto_hash_speeds[alg_id]); +} + +int cfs_crypto_hash_speed(unsigned char hash_alg) +{ + if (hash_alg < CFS_HASH_ALG_MAX) + return cfs_crypto_hash_speeds[hash_alg]; + return -1; +} +EXPORT_SYMBOL(cfs_crypto_hash_speed); + +/** + * Do performance test for all hash algorithms. + */ +static int cfs_crypto_test_hashes(void) +{ + unsigned char i; + unsigned char *data; + unsigned int j; + /* Data block size for testing hash. Maximum + * kmalloc size for 2.6.18 kernel is 128K + */ + unsigned int data_len = 1 * 128 * 1024; + + data = kmalloc(data_len, 0); + if (!data) + return -ENOMEM; + + for (j = 0; j < data_len; j++) + data[j] = j & 0xff; + + for (i = 0; i < CFS_HASH_ALG_MAX; i++) + cfs_crypto_performance_test(i, data, data_len); + + kfree(data); + return 0; +} + +static int adler32; + +int cfs_crypto_register(void) +{ + request_module("crc32c"); + + adler32 = cfs_crypto_adler32_register(); + + /* check all algorithms and do performance test */ + cfs_crypto_test_hashes(); + return 0; +} + +void cfs_crypto_unregister(void) +{ + if (adler32 == 0) + cfs_crypto_adler32_unregister(); +} |