diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/libcfs/linux/linux-crypto.c')
-rw-r--r-- | drivers/staging/lustre/lustre/libcfs/linux/linux-crypto.c | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/libcfs/linux/linux-crypto.c b/drivers/staging/lustre/lustre/libcfs/linux/linux-crypto.c new file mode 100644 index 000000000000..8e35777b4da5 --- /dev/null +++ b/drivers/staging/lustre/lustre/libcfs/linux/linux-crypto.c @@ -0,0 +1,289 @@ +/* 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 <linux/libcfs/libcfs.h> +#include <linux/libcfs/linux/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, (void *)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, (void *)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) +{ + 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; +} |