| /* 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 <linux/crypto.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 hash_desc *desc, unsigned char *key, |
| unsigned int key_len) |
| { |
| int err = 0; |
| |
| *type = cfs_crypto_hash_type(alg_id); |
| |
| if (*type == NULL) { |
| CWARN("Unsupported hash algorithm id = %d, max id is %d\n", |
| alg_id, CFS_HASH_ALG_MAX); |
| return -EINVAL; |
| } |
| desc->tfm = crypto_alloc_hash((*type)->cht_name, 0, 0); |
| |
| if (desc->tfm == NULL) |
| return -EINVAL; |
| |
| if (IS_ERR(desc->tfm)) { |
| CDEBUG(D_INFO, "Failed to alloc crypto hash %s\n", |
| (*type)->cht_name); |
| return PTR_ERR(desc->tfm); |
| } |
| |
| desc->flags = 0; |
| |
| /** 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 != NULL) { |
| err = crypto_hash_setkey(desc->tfm, key, key_len); |
| } else if ((*type)->cht_key != 0) { |
| err = crypto_hash_setkey(desc->tfm, |
| (unsigned char *)&((*type)->cht_key), |
| (*type)->cht_size); |
| } |
| |
| if (err != 0) { |
| crypto_free_hash(desc->tfm); |
| return err; |
| } |
| |
| CDEBUG(D_INFO, "Using crypto hash: %s (%s) speed %d MB/s\n", |
| (crypto_hash_tfm(desc->tfm))->__crt_alg->cra_name, |
| (crypto_hash_tfm(desc->tfm))->__crt_alg->cra_driver_name, |
| cfs_crypto_hash_speeds[alg_id]); |
| |
| return crypto_hash_init(desc); |
| } |
| |
| 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 hash_desc hdesc; |
| int err; |
| const struct cfs_crypto_hash_type *type; |
| |
| if (buf == NULL || buf_len == 0 || hash_len == NULL) |
| return -EINVAL; |
| |
| err = cfs_crypto_hash_alloc(alg_id, &type, &hdesc, key, key_len); |
| if (err != 0) |
| return err; |
| |
| if (hash == NULL || *hash_len < type->cht_size) { |
| *hash_len = type->cht_size; |
| crypto_free_hash(hdesc.tfm); |
| return -ENOSPC; |
| } |
| sg_init_one(&sl, buf, buf_len); |
| |
| hdesc.flags = 0; |
| err = crypto_hash_digest(&hdesc, &sl, sl.length, hash); |
| crypto_free_hash(hdesc.tfm); |
| |
| 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 hash_desc *hdesc; |
| int err; |
| const struct cfs_crypto_hash_type *type; |
| |
| hdesc = kmalloc(sizeof(*hdesc), 0); |
| if (hdesc == NULL) |
| return ERR_PTR(-ENOMEM); |
| |
| err = cfs_crypto_hash_alloc(alg_id, &type, hdesc, key, key_len); |
| |
| if (err) { |
| kfree(hdesc); |
| return ERR_PTR(err); |
| } |
| return (struct cfs_crypto_hash_desc *)hdesc; |
| } |
| 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 scatterlist sl; |
| |
| sg_init_table(&sl, 1); |
| sg_set_page(&sl, page, len, offset & ~CFS_PAGE_MASK); |
| |
| return crypto_hash_update((struct hash_desc *)hdesc, &sl, sl.length); |
| } |
| 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 scatterlist sl; |
| |
| sg_init_one(&sl, buf, buf_len); |
| |
| return crypto_hash_update((struct hash_desc *)hdesc, &sl, sl.length); |
| } |
| 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; |
| int size = crypto_hash_digestsize(((struct hash_desc *)hdesc)->tfm); |
| |
| if (hash_len == NULL) { |
| crypto_free_hash(((struct hash_desc *)hdesc)->tfm); |
| kfree(hdesc); |
| return 0; |
| } |
| if (hash == NULL || *hash_len < size) { |
| *hash_len = size; |
| return -ENOSPC; |
| } |
| err = crypto_hash_final((struct hash_desc *) hdesc, hash); |
| |
| if (err < 0) { |
| /* May be caller can fix error */ |
| return err; |
| } |
| crypto_free_hash(((struct hash_desc *)hdesc)->tfm); |
| kfree(hdesc); |
| 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]; |
| else |
| 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 == NULL) { |
| CERROR("Failed to allocate mem\n"); |
| 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(); |
| |
| return; |
| } |