[v2 PATCH 9/26] eCryptfs: Use skcipher and shash
Tyler Hicks
tyhicks at canonical.com
Fri Jan 29 17:22:30 UTC 2016
On 2016-01-25 10:29:33, Herbert Xu wrote:
> On Sun, Jan 24, 2016 at 07:10:50PM +0100, Julia Lawall wrote:
> > Maybe the goto on line 1726 needs a preceding mutex_unlock?
>
> Good catch! Thanks.
>
> ---8<---
> This patch replaces uses of ablkcipher and blkcipher with skcipher,
> and the long obsolete hash interface with shash.
>
> Signed-off-by: Herbert Xu <herbert at gondor.apana.org.au>
Acked-by: Tyler Hicks <tyhicks at canonical.com>
I have no problem with you taking this through the cryptodev tree.
Thanks!
Tyler
>
> diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
> index 80d6901..11255cb 100644
> --- a/fs/ecryptfs/crypto.c
> +++ b/fs/ecryptfs/crypto.c
> @@ -23,6 +23,8 @@
> * 02111-1307, USA.
> */
>
> +#include <crypto/hash.h>
> +#include <crypto/skcipher.h>
> #include <linux/fs.h>
> #include <linux/mount.h>
> #include <linux/pagemap.h>
> @@ -30,7 +32,6 @@
> #include <linux/compiler.h>
> #include <linux/key.h>
> #include <linux/namei.h>
> -#include <linux/crypto.h>
> #include <linux/file.h>
> #include <linux/scatterlist.h>
> #include <linux/slab.h>
> @@ -74,6 +75,19 @@ void ecryptfs_from_hex(char *dst, char *src, int dst_size)
> }
> }
>
> +static int ecryptfs_hash_digest(struct crypto_shash *tfm,
> + char *src, int len, char *dst)
> +{
> + SHASH_DESC_ON_STACK(desc, tfm);
> + int err;
> +
> + desc->tfm = tfm;
> + desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
> + err = crypto_shash_digest(desc, src, len, dst);
> + shash_desc_zero(desc);
> + return err;
> +}
> +
> /**
> * ecryptfs_calculate_md5 - calculates the md5 of @src
> * @dst: Pointer to 16 bytes of allocated memory
> @@ -88,45 +102,26 @@ static int ecryptfs_calculate_md5(char *dst,
> struct ecryptfs_crypt_stat *crypt_stat,
> char *src, int len)
> {
> - struct scatterlist sg;
> - struct hash_desc desc = {
> - .tfm = crypt_stat->hash_tfm,
> - .flags = CRYPTO_TFM_REQ_MAY_SLEEP
> - };
> + struct crypto_shash *tfm;
> int rc = 0;
>
> mutex_lock(&crypt_stat->cs_hash_tfm_mutex);
> - sg_init_one(&sg, (u8 *)src, len);
> - if (!desc.tfm) {
> - desc.tfm = crypto_alloc_hash(ECRYPTFS_DEFAULT_HASH, 0,
> - CRYPTO_ALG_ASYNC);
> - if (IS_ERR(desc.tfm)) {
> - rc = PTR_ERR(desc.tfm);
> + tfm = crypt_stat->hash_tfm;
> + if (!tfm) {
> + tfm = crypto_alloc_shash(ECRYPTFS_DEFAULT_HASH, 0, 0);
> + if (IS_ERR(tfm)) {
> + rc = PTR_ERR(tfm);
> ecryptfs_printk(KERN_ERR, "Error attempting to "
> "allocate crypto context; rc = [%d]\n",
> rc);
> goto out;
> }
> - crypt_stat->hash_tfm = desc.tfm;
> - }
> - rc = crypto_hash_init(&desc);
> - if (rc) {
> - printk(KERN_ERR
> - "%s: Error initializing crypto hash; rc = [%d]\n",
> - __func__, rc);
> - goto out;
> + crypt_stat->hash_tfm = tfm;
> }
> - rc = crypto_hash_update(&desc, &sg, len);
> + rc = ecryptfs_hash_digest(tfm, src, len, dst);
> if (rc) {
> printk(KERN_ERR
> - "%s: Error updating crypto hash; rc = [%d]\n",
> - __func__, rc);
> - goto out;
> - }
> - rc = crypto_hash_final(&desc, dst);
> - if (rc) {
> - printk(KERN_ERR
> - "%s: Error finalizing crypto hash; rc = [%d]\n",
> + "%s: Error computing crypto hash; rc = [%d]\n",
> __func__, rc);
> goto out;
> }
> @@ -234,10 +229,8 @@ void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat)
> {
> struct ecryptfs_key_sig *key_sig, *key_sig_tmp;
>
> - if (crypt_stat->tfm)
> - crypto_free_ablkcipher(crypt_stat->tfm);
> - if (crypt_stat->hash_tfm)
> - crypto_free_hash(crypt_stat->hash_tfm);
> + crypto_free_skcipher(crypt_stat->tfm);
> + crypto_free_shash(crypt_stat->hash_tfm);
> list_for_each_entry_safe(key_sig, key_sig_tmp,
> &crypt_stat->keysig_list, crypt_stat_list) {
> list_del(&key_sig->crypt_stat_list);
> @@ -342,7 +335,7 @@ static int crypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
> struct scatterlist *src_sg, int size,
> unsigned char *iv, int op)
> {
> - struct ablkcipher_request *req = NULL;
> + struct skcipher_request *req = NULL;
> struct extent_crypt_result ecr;
> int rc = 0;
>
> @@ -358,20 +351,20 @@ static int crypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
> init_completion(&ecr.completion);
>
> mutex_lock(&crypt_stat->cs_tfm_mutex);
> - req = ablkcipher_request_alloc(crypt_stat->tfm, GFP_NOFS);
> + req = skcipher_request_alloc(crypt_stat->tfm, GFP_NOFS);
> if (!req) {
> mutex_unlock(&crypt_stat->cs_tfm_mutex);
> rc = -ENOMEM;
> goto out;
> }
>
> - ablkcipher_request_set_callback(req,
> + skcipher_request_set_callback(req,
> CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
> extent_crypt_complete, &ecr);
> /* Consider doing this once, when the file is opened */
> if (!(crypt_stat->flags & ECRYPTFS_KEY_SET)) {
> - rc = crypto_ablkcipher_setkey(crypt_stat->tfm, crypt_stat->key,
> - crypt_stat->key_size);
> + rc = crypto_skcipher_setkey(crypt_stat->tfm, crypt_stat->key,
> + crypt_stat->key_size);
> if (rc) {
> ecryptfs_printk(KERN_ERR,
> "Error setting key; rc = [%d]\n",
> @@ -383,9 +376,9 @@ static int crypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
> crypt_stat->flags |= ECRYPTFS_KEY_SET;
> }
> mutex_unlock(&crypt_stat->cs_tfm_mutex);
> - ablkcipher_request_set_crypt(req, src_sg, dst_sg, size, iv);
> - rc = op == ENCRYPT ? crypto_ablkcipher_encrypt(req) :
> - crypto_ablkcipher_decrypt(req);
> + skcipher_request_set_crypt(req, src_sg, dst_sg, size, iv);
> + rc = op == ENCRYPT ? crypto_skcipher_encrypt(req) :
> + crypto_skcipher_decrypt(req);
> if (rc == -EINPROGRESS || rc == -EBUSY) {
> struct extent_crypt_result *ecr = req->base.data;
>
> @@ -394,7 +387,7 @@ static int crypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
> reinit_completion(&ecr->completion);
> }
> out:
> - ablkcipher_request_free(req);
> + skcipher_request_free(req);
> return rc;
> }
>
> @@ -622,7 +615,7 @@ int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat)
> crypt_stat->cipher, "cbc");
> if (rc)
> goto out_unlock;
> - crypt_stat->tfm = crypto_alloc_ablkcipher(full_alg_name, 0, 0);
> + crypt_stat->tfm = crypto_alloc_skcipher(full_alg_name, 0, 0);
> if (IS_ERR(crypt_stat->tfm)) {
> rc = PTR_ERR(crypt_stat->tfm);
> crypt_stat->tfm = NULL;
> @@ -631,7 +624,7 @@ int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat)
> full_alg_name);
> goto out_free;
> }
> - crypto_ablkcipher_set_flags(crypt_stat->tfm, CRYPTO_TFM_REQ_WEAK_KEY);
> + crypto_skcipher_set_flags(crypt_stat->tfm, CRYPTO_TFM_REQ_WEAK_KEY);
> rc = 0;
> out_free:
> kfree(full_alg_name);
> @@ -1591,7 +1584,7 @@ out:
> * event, regardless of whether this function succeeds for fails.
> */
> static int
> -ecryptfs_process_key_cipher(struct crypto_blkcipher **key_tfm,
> +ecryptfs_process_key_cipher(struct crypto_skcipher **key_tfm,
> char *cipher_name, size_t *key_size)
> {
> char dummy_key[ECRYPTFS_MAX_KEY_BYTES];
> @@ -1609,21 +1602,18 @@ ecryptfs_process_key_cipher(struct crypto_blkcipher **key_tfm,
> "ecb");
> if (rc)
> goto out;
> - *key_tfm = crypto_alloc_blkcipher(full_alg_name, 0, CRYPTO_ALG_ASYNC);
> + *key_tfm = crypto_alloc_skcipher(full_alg_name, 0, CRYPTO_ALG_ASYNC);
> if (IS_ERR(*key_tfm)) {
> rc = PTR_ERR(*key_tfm);
> printk(KERN_ERR "Unable to allocate crypto cipher with name "
> "[%s]; rc = [%d]\n", full_alg_name, rc);
> goto out;
> }
> - crypto_blkcipher_set_flags(*key_tfm, CRYPTO_TFM_REQ_WEAK_KEY);
> - if (*key_size == 0) {
> - struct blkcipher_alg *alg = crypto_blkcipher_alg(*key_tfm);
> -
> - *key_size = alg->max_keysize;
> - }
> + crypto_skcipher_set_flags(*key_tfm, CRYPTO_TFM_REQ_WEAK_KEY);
> + if (*key_size == 0)
> + *key_size = crypto_skcipher_default_keysize(*key_tfm);
> get_random_bytes(dummy_key, *key_size);
> - rc = crypto_blkcipher_setkey(*key_tfm, dummy_key, *key_size);
> + rc = crypto_skcipher_setkey(*key_tfm, dummy_key, *key_size);
> if (rc) {
> printk(KERN_ERR "Error attempting to set key of size [%zd] for "
> "cipher [%s]; rc = [%d]\n", *key_size, full_alg_name,
> @@ -1660,8 +1650,7 @@ int ecryptfs_destroy_crypto(void)
> list_for_each_entry_safe(key_tfm, key_tfm_tmp, &key_tfm_list,
> key_tfm_list) {
> list_del(&key_tfm->key_tfm_list);
> - if (key_tfm->key_tfm)
> - crypto_free_blkcipher(key_tfm->key_tfm);
> + crypto_free_skcipher(key_tfm->key_tfm);
> kmem_cache_free(ecryptfs_key_tfm_cache, key_tfm);
> }
> mutex_unlock(&key_tfm_list_mutex);
> @@ -1747,7 +1736,7 @@ int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm)
> * Searches for cached item first, and creates new if not found.
> * Returns 0 on success, non-zero if adding new cipher failed
> */
> -int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm,
> +int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_skcipher **tfm,
> struct mutex **tfm_mutex,
> char *cipher_name)
> {
> @@ -2120,7 +2109,7 @@ out:
> int ecryptfs_set_f_namelen(long *namelen, long lower_namelen,
> struct ecryptfs_mount_crypt_stat *mount_crypt_stat)
> {
> - struct blkcipher_desc desc;
> + struct crypto_skcipher *tfm;
> struct mutex *tfm_mutex;
> size_t cipher_blocksize;
> int rc;
> @@ -2130,7 +2119,7 @@ int ecryptfs_set_f_namelen(long *namelen, long lower_namelen,
> return 0;
> }
>
> - rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(&desc.tfm, &tfm_mutex,
> + rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(&tfm, &tfm_mutex,
> mount_crypt_stat->global_default_fn_cipher_name);
> if (unlikely(rc)) {
> (*namelen) = 0;
> @@ -2138,7 +2127,7 @@ int ecryptfs_set_f_namelen(long *namelen, long lower_namelen,
> }
>
> mutex_lock(tfm_mutex);
> - cipher_blocksize = crypto_blkcipher_blocksize(desc.tfm);
> + cipher_blocksize = crypto_skcipher_blocksize(tfm);
> mutex_unlock(tfm_mutex);
>
> /* Return an exact amount for the common cases */
> diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
> index 7b39260..b7f8128 100644
> --- a/fs/ecryptfs/ecryptfs_kernel.h
> +++ b/fs/ecryptfs/ecryptfs_kernel.h
> @@ -28,6 +28,7 @@
> #ifndef ECRYPTFS_KERNEL_H
> #define ECRYPTFS_KERNEL_H
>
> +#include <crypto/skcipher.h>
> #include <keys/user-type.h>
> #include <keys/encrypted-type.h>
> #include <linux/fs.h>
> @@ -38,7 +39,6 @@
> #include <linux/nsproxy.h>
> #include <linux/backing-dev.h>
> #include <linux/ecryptfs.h>
> -#include <linux/crypto.h>
>
> #define ECRYPTFS_DEFAULT_IV_BYTES 16
> #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096
> @@ -233,9 +233,9 @@ struct ecryptfs_crypt_stat {
> size_t extent_shift;
> unsigned int extent_mask;
> struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
> - struct crypto_ablkcipher *tfm;
> - struct crypto_hash *hash_tfm; /* Crypto context for generating
> - * the initialization vectors */
> + struct crypto_skcipher *tfm;
> + struct crypto_shash *hash_tfm; /* Crypto context for generating
> + * the initialization vectors */
> unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
> unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
> unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES];
> @@ -309,7 +309,7 @@ struct ecryptfs_global_auth_tok {
> * keeps a list of crypto API contexts around to use when needed.
> */
> struct ecryptfs_key_tfm {
> - struct crypto_blkcipher *key_tfm;
> + struct crypto_skcipher *key_tfm;
> size_t key_size;
> struct mutex key_tfm_mutex;
> struct list_head key_tfm_list;
> @@ -659,7 +659,7 @@ ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name,
> int ecryptfs_init_crypto(void);
> int ecryptfs_destroy_crypto(void);
> int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm);
> -int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm,
> +int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_skcipher **tfm,
> struct mutex **tfm_mutex,
> char *cipher_name);
> int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
> diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
> index 040aa87..ed74d80 100644
> --- a/fs/ecryptfs/inode.c
> +++ b/fs/ecryptfs/inode.c
> @@ -29,7 +29,6 @@
> #include <linux/dcache.h>
> #include <linux/namei.h>
> #include <linux/mount.h>
> -#include <linux/crypto.h>
> #include <linux/fs_stack.h>
> #include <linux/slab.h>
> #include <linux/xattr.h>
> diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c
> index 6bd67e2..c5c84df 100644
> --- a/fs/ecryptfs/keystore.c
> +++ b/fs/ecryptfs/keystore.c
> @@ -25,11 +25,12 @@
> * 02111-1307, USA.
> */
>
> +#include <crypto/hash.h>
> +#include <crypto/skcipher.h>
> #include <linux/string.h>
> #include <linux/pagemap.h>
> #include <linux/key.h>
> #include <linux/random.h>
> -#include <linux/crypto.h>
> #include <linux/scatterlist.h>
> #include <linux/slab.h>
> #include "ecryptfs_kernel.h"
> @@ -601,12 +602,13 @@ struct ecryptfs_write_tag_70_packet_silly_stack {
> struct ecryptfs_auth_tok *auth_tok;
> struct scatterlist src_sg[2];
> struct scatterlist dst_sg[2];
> - struct blkcipher_desc desc;
> + struct crypto_skcipher *skcipher_tfm;
> + struct skcipher_request *skcipher_req;
> char iv[ECRYPTFS_MAX_IV_BYTES];
> char hash[ECRYPTFS_TAG_70_DIGEST_SIZE];
> char tmp_hash[ECRYPTFS_TAG_70_DIGEST_SIZE];
> - struct hash_desc hash_desc;
> - struct scatterlist hash_sg;
> + struct crypto_shash *hash_tfm;
> + struct shash_desc *hash_desc;
> };
>
> /**
> @@ -629,14 +631,13 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
> struct key *auth_tok_key = NULL;
> int rc = 0;
>
> - s = kmalloc(sizeof(*s), GFP_KERNEL);
> + s = kzalloc(sizeof(*s), GFP_KERNEL);
> if (!s) {
> printk(KERN_ERR "%s: Out of memory whilst trying to kmalloc "
> "[%zd] bytes of kernel memory\n", __func__, sizeof(*s));
> rc = -ENOMEM;
> goto out;
> }
> - s->desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
> (*packet_size) = 0;
> rc = ecryptfs_find_auth_tok_for_sig(
> &auth_tok_key,
> @@ -649,7 +650,7 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
> goto out;
> }
> rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(
> - &s->desc.tfm,
> + &s->skcipher_tfm,
> &s->tfm_mutex, mount_crypt_stat->global_default_fn_cipher_name);
> if (unlikely(rc)) {
> printk(KERN_ERR "Internal error whilst attempting to get "
> @@ -658,7 +659,7 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
> goto out;
> }
> mutex_lock(s->tfm_mutex);
> - s->block_size = crypto_blkcipher_blocksize(s->desc.tfm);
> + s->block_size = crypto_skcipher_blocksize(s->skcipher_tfm);
> /* Plus one for the \0 separator between the random prefix
> * and the plaintext filename */
> s->num_rand_bytes = (ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES + 1);
> @@ -691,6 +692,19 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
> rc = -EINVAL;
> goto out_unlock;
> }
> +
> + s->skcipher_req = skcipher_request_alloc(s->skcipher_tfm, GFP_KERNEL);
> + if (!s->skcipher_req) {
> + printk(KERN_ERR "%s: Out of kernel memory whilst attempting to "
> + "skcipher_request_alloc for %s\n", __func__,
> + crypto_skcipher_driver_name(s->skcipher_tfm));
> + rc = -ENOMEM;
> + goto out_unlock;
> + }
> +
> + skcipher_request_set_callback(s->skcipher_req,
> + CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL);
> +
> s->block_aligned_filename = kzalloc(s->block_aligned_filename_size,
> GFP_KERNEL);
> if (!s->block_aligned_filename) {
> @@ -700,7 +714,6 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
> rc = -ENOMEM;
> goto out_unlock;
> }
> - s->i = 0;
> dest[s->i++] = ECRYPTFS_TAG_70_PACKET_TYPE;
> rc = ecryptfs_write_packet_length(&dest[s->i],
> (ECRYPTFS_SIG_SIZE
> @@ -738,40 +751,36 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
> "password tokens\n", __func__);
> goto out_free_unlock;
> }
> - sg_init_one(
> - &s->hash_sg,
> - (u8 *)s->auth_tok->token.password.session_key_encryption_key,
> - s->auth_tok->token.password.session_key_encryption_key_bytes);
> - s->hash_desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
> - s->hash_desc.tfm = crypto_alloc_hash(ECRYPTFS_TAG_70_DIGEST, 0,
> - CRYPTO_ALG_ASYNC);
> - if (IS_ERR(s->hash_desc.tfm)) {
> - rc = PTR_ERR(s->hash_desc.tfm);
> + s->hash_tfm = crypto_alloc_shash(ECRYPTFS_TAG_70_DIGEST, 0, 0);
> + if (IS_ERR(s->hash_tfm)) {
> + rc = PTR_ERR(s->hash_tfm);
> printk(KERN_ERR "%s: Error attempting to "
> "allocate hash crypto context; rc = [%d]\n",
> __func__, rc);
> goto out_free_unlock;
> }
> - rc = crypto_hash_init(&s->hash_desc);
> - if (rc) {
> - printk(KERN_ERR
> - "%s: Error initializing crypto hash; rc = [%d]\n",
> - __func__, rc);
> - goto out_release_free_unlock;
> - }
> - rc = crypto_hash_update(
> - &s->hash_desc, &s->hash_sg,
> - s->auth_tok->token.password.session_key_encryption_key_bytes);
> - if (rc) {
> - printk(KERN_ERR
> - "%s: Error updating crypto hash; rc = [%d]\n",
> - __func__, rc);
> +
> + s->hash_desc = kmalloc(sizeof(*s->hash_desc) +
> + crypto_shash_descsize(s->hash_tfm), GFP_KERNEL);
> + if (!s->hash_desc) {
> + printk(KERN_ERR "%s: Out of kernel memory whilst attempting to "
> + "kmalloc [%zd] bytes\n", __func__,
> + sizeof(*s->hash_desc) +
> + crypto_shash_descsize(s->hash_tfm));
> + rc = -ENOMEM;
> goto out_release_free_unlock;
> }
> - rc = crypto_hash_final(&s->hash_desc, s->hash);
> +
> + s->hash_desc->tfm = s->hash_tfm;
> + s->hash_desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
> +
> + rc = crypto_shash_digest(s->hash_desc,
> + (u8 *)s->auth_tok->token.password.session_key_encryption_key,
> + s->auth_tok->token.password.session_key_encryption_key_bytes,
> + s->hash);
> if (rc) {
> printk(KERN_ERR
> - "%s: Error finalizing crypto hash; rc = [%d]\n",
> + "%s: Error computing crypto hash; rc = [%d]\n",
> __func__, rc);
> goto out_release_free_unlock;
> }
> @@ -780,27 +789,12 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
> s->hash[(s->j % ECRYPTFS_TAG_70_DIGEST_SIZE)];
> if ((s->j % ECRYPTFS_TAG_70_DIGEST_SIZE)
> == (ECRYPTFS_TAG_70_DIGEST_SIZE - 1)) {
> - sg_init_one(&s->hash_sg, (u8 *)s->hash,
> - ECRYPTFS_TAG_70_DIGEST_SIZE);
> - rc = crypto_hash_init(&s->hash_desc);
> - if (rc) {
> - printk(KERN_ERR
> - "%s: Error initializing crypto hash; "
> - "rc = [%d]\n", __func__, rc);
> - goto out_release_free_unlock;
> - }
> - rc = crypto_hash_update(&s->hash_desc, &s->hash_sg,
> - ECRYPTFS_TAG_70_DIGEST_SIZE);
> + rc = crypto_shash_digest(s->hash_desc, (u8 *)s->hash,
> + ECRYPTFS_TAG_70_DIGEST_SIZE,
> + s->tmp_hash);
> if (rc) {
> printk(KERN_ERR
> - "%s: Error updating crypto hash; "
> - "rc = [%d]\n", __func__, rc);
> - goto out_release_free_unlock;
> - }
> - rc = crypto_hash_final(&s->hash_desc, s->tmp_hash);
> - if (rc) {
> - printk(KERN_ERR
> - "%s: Error finalizing crypto hash; "
> + "%s: Error computing crypto hash; "
> "rc = [%d]\n", __func__, rc);
> goto out_release_free_unlock;
> }
> @@ -834,10 +828,8 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
> * of the IV here, so we just use 0's for the IV. Note the
> * constraint that ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES
> * >= ECRYPTFS_MAX_IV_BYTES. */
> - memset(s->iv, 0, ECRYPTFS_MAX_IV_BYTES);
> - s->desc.info = s->iv;
> - rc = crypto_blkcipher_setkey(
> - s->desc.tfm,
> + rc = crypto_skcipher_setkey(
> + s->skcipher_tfm,
> s->auth_tok->token.password.session_key_encryption_key,
> mount_crypt_stat->global_default_fn_cipher_key_bytes);
> if (rc < 0) {
> @@ -850,8 +842,9 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
> mount_crypt_stat->global_default_fn_cipher_key_bytes);
> goto out_release_free_unlock;
> }
> - rc = crypto_blkcipher_encrypt_iv(&s->desc, s->dst_sg, s->src_sg,
> - s->block_aligned_filename_size);
> + skcipher_request_set_crypt(s->skcipher_req, s->src_sg, s->dst_sg,
> + s->block_aligned_filename_size, s->iv);
> + rc = crypto_skcipher_encrypt(s->skcipher_req);
> if (rc) {
> printk(KERN_ERR "%s: Error attempting to encrypt filename; "
> "rc = [%d]\n", __func__, rc);
> @@ -861,7 +854,7 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
> (*packet_size) = s->i;
> (*remaining_bytes) -= (*packet_size);
> out_release_free_unlock:
> - crypto_free_hash(s->hash_desc.tfm);
> + crypto_free_shash(s->hash_tfm);
> out_free_unlock:
> kzfree(s->block_aligned_filename);
> out_unlock:
> @@ -871,6 +864,8 @@ out:
> up_write(&(auth_tok_key->sem));
> key_put(auth_tok_key);
> }
> + skcipher_request_free(s->skcipher_req);
> + kzfree(s->hash_desc);
> kfree(s);
> return rc;
> }
> @@ -888,7 +883,8 @@ struct ecryptfs_parse_tag_70_packet_silly_stack {
> struct ecryptfs_auth_tok *auth_tok;
> struct scatterlist src_sg[2];
> struct scatterlist dst_sg[2];
> - struct blkcipher_desc desc;
> + struct crypto_skcipher *skcipher_tfm;
> + struct skcipher_request *skcipher_req;
> char fnek_sig_hex[ECRYPTFS_SIG_SIZE_HEX + 1];
> char iv[ECRYPTFS_MAX_IV_BYTES];
> char cipher_string[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
> @@ -922,14 +918,13 @@ ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
> (*packet_size) = 0;
> (*filename_size) = 0;
> (*filename) = NULL;
> - s = kmalloc(sizeof(*s), GFP_KERNEL);
> + s = kzalloc(sizeof(*s), GFP_KERNEL);
> if (!s) {
> printk(KERN_ERR "%s: Out of memory whilst trying to kmalloc "
> "[%zd] bytes of kernel memory\n", __func__, sizeof(*s));
> rc = -ENOMEM;
> goto out;
> }
> - s->desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
> if (max_packet_size < ECRYPTFS_TAG_70_MIN_METADATA_SIZE) {
> printk(KERN_WARNING "%s: max_packet_size is [%zd]; it must be "
> "at least [%d]\n", __func__, max_packet_size,
> @@ -992,7 +987,7 @@ ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
> rc);
> goto out;
> }
> - rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(&s->desc.tfm,
> + rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(&s->skcipher_tfm,
> &s->tfm_mutex,
> s->cipher_string);
> if (unlikely(rc)) {
> @@ -1030,12 +1025,23 @@ ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
> __func__, rc, s->block_aligned_filename_size);
> goto out_free_unlock;
> }
> +
> + s->skcipher_req = skcipher_request_alloc(s->skcipher_tfm, GFP_KERNEL);
> + if (!s->skcipher_req) {
> + printk(KERN_ERR "%s: Out of kernel memory whilst attempting to "
> + "skcipher_request_alloc for %s\n", __func__,
> + crypto_skcipher_driver_name(s->skcipher_tfm));
> + rc = -ENOMEM;
> + goto out_free_unlock;
> + }
> +
> + skcipher_request_set_callback(s->skcipher_req,
> + CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL);
> +
> /* The characters in the first block effectively do the job of
> * the IV here, so we just use 0's for the IV. Note the
> * constraint that ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES
> * >= ECRYPTFS_MAX_IV_BYTES. */
> - memset(s->iv, 0, ECRYPTFS_MAX_IV_BYTES);
> - s->desc.info = s->iv;
> /* TODO: Support other key modules than passphrase for
> * filename encryption */
> if (s->auth_tok->token_type != ECRYPTFS_PASSWORD) {
> @@ -1044,8 +1050,8 @@ ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
> "password tokens\n", __func__);
> goto out_free_unlock;
> }
> - rc = crypto_blkcipher_setkey(
> - s->desc.tfm,
> + rc = crypto_skcipher_setkey(
> + s->skcipher_tfm,
> s->auth_tok->token.password.session_key_encryption_key,
> mount_crypt_stat->global_default_fn_cipher_key_bytes);
> if (rc < 0) {
> @@ -1058,14 +1064,14 @@ ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
> mount_crypt_stat->global_default_fn_cipher_key_bytes);
> goto out_free_unlock;
> }
> - rc = crypto_blkcipher_decrypt_iv(&s->desc, s->dst_sg, s->src_sg,
> - s->block_aligned_filename_size);
> + skcipher_request_set_crypt(s->skcipher_req, s->src_sg, s->dst_sg,
> + s->block_aligned_filename_size, s->iv);
> + rc = crypto_skcipher_decrypt(s->skcipher_req);
> if (rc) {
> printk(KERN_ERR "%s: Error attempting to decrypt filename; "
> "rc = [%d]\n", __func__, rc);
> goto out_free_unlock;
> }
> - s->i = 0;
> while (s->decrypted_filename[s->i] != '\0'
> && s->i < s->block_aligned_filename_size)
> s->i++;
> @@ -1108,6 +1114,7 @@ out:
> up_write(&(auth_tok_key->sem));
> key_put(auth_tok_key);
> }
> + skcipher_request_free(s->skcipher_req);
> kfree(s);
> return rc;
> }
> @@ -1667,9 +1674,8 @@ decrypt_passphrase_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
> struct scatterlist dst_sg[2];
> struct scatterlist src_sg[2];
> struct mutex *tfm_mutex;
> - struct blkcipher_desc desc = {
> - .flags = CRYPTO_TFM_REQ_MAY_SLEEP
> - };
> + struct crypto_skcipher *tfm;
> + struct skcipher_request *req = NULL;
> int rc = 0;
>
> if (unlikely(ecryptfs_verbosity > 0)) {
> @@ -1680,7 +1686,7 @@ decrypt_passphrase_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
> auth_tok->token.password.session_key_encryption_key,
> auth_tok->token.password.session_key_encryption_key_bytes);
> }
> - rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(&desc.tfm, &tfm_mutex,
> + rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(&tfm, &tfm_mutex,
> crypt_stat->cipher);
> if (unlikely(rc)) {
> printk(KERN_ERR "Internal error whilst attempting to get "
> @@ -1711,8 +1717,20 @@ decrypt_passphrase_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
> goto out;
> }
> mutex_lock(tfm_mutex);
> - rc = crypto_blkcipher_setkey(
> - desc.tfm, auth_tok->token.password.session_key_encryption_key,
> + req = skcipher_request_alloc(tfm, GFP_KERNEL);
> + if (!req) {
> + mutex_unlock(tfm_mutex);
> + printk(KERN_ERR "%s: Out of kernel memory whilst attempting to "
> + "skcipher_request_alloc for %s\n", __func__,
> + crypto_skcipher_driver_name(tfm));
> + rc = -ENOMEM;
> + goto out;
> + }
> +
> + skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP,
> + NULL, NULL);
> + rc = crypto_skcipher_setkey(
> + tfm, auth_tok->token.password.session_key_encryption_key,
> crypt_stat->key_size);
> if (unlikely(rc < 0)) {
> mutex_unlock(tfm_mutex);
> @@ -1720,8 +1738,10 @@ decrypt_passphrase_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
> rc = -EINVAL;
> goto out;
> }
> - rc = crypto_blkcipher_decrypt(&desc, dst_sg, src_sg,
> - auth_tok->session_key.encrypted_key_size);
> + skcipher_request_set_crypt(req, src_sg, dst_sg,
> + auth_tok->session_key.encrypted_key_size,
> + NULL);
> + rc = crypto_skcipher_decrypt(req);
> mutex_unlock(tfm_mutex);
> if (unlikely(rc)) {
> printk(KERN_ERR "Error decrypting; rc = [%d]\n", rc);
> @@ -1738,6 +1758,7 @@ decrypt_passphrase_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
> crypt_stat->key_size);
> }
> out:
> + skcipher_request_free(req);
> return rc;
> }
>
> @@ -2191,16 +2212,14 @@ write_tag_3_packet(char *dest, size_t *remaining_bytes,
> size_t max_packet_size;
> struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
> crypt_stat->mount_crypt_stat;
> - struct blkcipher_desc desc = {
> - .tfm = NULL,
> - .flags = CRYPTO_TFM_REQ_MAY_SLEEP
> - };
> + struct crypto_skcipher *tfm;
> + struct skcipher_request *req;
> int rc = 0;
>
> (*packet_size) = 0;
> ecryptfs_from_hex(key_rec->sig, auth_tok->token.password.signature,
> ECRYPTFS_SIG_SIZE);
> - rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(&desc.tfm, &tfm_mutex,
> + rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(&tfm, &tfm_mutex,
> crypt_stat->cipher);
> if (unlikely(rc)) {
> printk(KERN_ERR "Internal error whilst attempting to get "
> @@ -2209,12 +2228,11 @@ write_tag_3_packet(char *dest, size_t *remaining_bytes,
> goto out;
> }
> if (mount_crypt_stat->global_default_cipher_key_size == 0) {
> - struct blkcipher_alg *alg = crypto_blkcipher_alg(desc.tfm);
> -
> printk(KERN_WARNING "No key size specified at mount; "
> - "defaulting to [%d]\n", alg->max_keysize);
> + "defaulting to [%d]\n",
> + crypto_skcipher_default_keysize(tfm));
> mount_crypt_stat->global_default_cipher_key_size =
> - alg->max_keysize;
> + crypto_skcipher_default_keysize(tfm);
> }
> if (crypt_stat->key_size == 0)
> crypt_stat->key_size =
> @@ -2284,20 +2302,36 @@ write_tag_3_packet(char *dest, size_t *remaining_bytes,
> goto out;
> }
> mutex_lock(tfm_mutex);
> - rc = crypto_blkcipher_setkey(desc.tfm, session_key_encryption_key,
> - crypt_stat->key_size);
> + rc = crypto_skcipher_setkey(tfm, session_key_encryption_key,
> + crypt_stat->key_size);
> if (rc < 0) {
> mutex_unlock(tfm_mutex);
> ecryptfs_printk(KERN_ERR, "Error setting key for crypto "
> "context; rc = [%d]\n", rc);
> goto out;
> }
> +
> + req = skcipher_request_alloc(tfm, GFP_KERNEL);
> + if (!req) {
> + mutex_unlock(tfm_mutex);
> + ecryptfs_printk(KERN_ERR, "Out of kernel memory whilst "
> + "attempting to skcipher_request_alloc for "
> + "%s\n", crypto_skcipher_driver_name(tfm));
> + rc = -ENOMEM;
> + goto out;
> + }
> +
> + skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP,
> + NULL, NULL);
> +
> rc = 0;
> ecryptfs_printk(KERN_DEBUG, "Encrypting [%zd] bytes of the key\n",
> crypt_stat->key_size);
> - rc = crypto_blkcipher_encrypt(&desc, dst_sg, src_sg,
> - (*key_rec).enc_key_size);
> + skcipher_request_set_crypt(req, src_sg, dst_sg,
> + (*key_rec).enc_key_size, NULL);
> + rc = crypto_skcipher_encrypt(req);
> mutex_unlock(tfm_mutex);
> + skcipher_request_free(req);
> if (rc) {
> printk(KERN_ERR "Error encrypting; rc = [%d]\n", rc);
> goto out;
> diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
> index e25b6b0..8b0b4a7 100644
> --- a/fs/ecryptfs/main.c
> +++ b/fs/ecryptfs/main.c
> @@ -29,7 +29,6 @@
> #include <linux/module.h>
> #include <linux/namei.h>
> #include <linux/skbuff.h>
> -#include <linux/crypto.h>
> #include <linux/mount.h>
> #include <linux/pagemap.h>
> #include <linux/key.h>
> diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
> index caba848..36c8b08 100644
> --- a/fs/ecryptfs/mmap.c
> +++ b/fs/ecryptfs/mmap.c
> @@ -30,7 +30,6 @@
> #include <linux/page-flags.h>
> #include <linux/mount.h>
> #include <linux/file.h>
> -#include <linux/crypto.h>
> #include <linux/scatterlist.h>
> #include <linux/slab.h>
> #include <asm/unaligned.h>
> diff --git a/fs/ecryptfs/super.c b/fs/ecryptfs/super.c
> index afa1b81..77a486d 100644
> --- a/fs/ecryptfs/super.c
> +++ b/fs/ecryptfs/super.c
> @@ -29,7 +29,6 @@
> #include <linux/slab.h>
> #include <linux/seq_file.h>
> #include <linux/file.h>
> -#include <linux/crypto.h>
> #include <linux/statfs.h>
> #include <linux/magic.h>
> #include "ecryptfs_kernel.h"
> --
> Email: Herbert Xu <herbert at gondor.apana.org.au>
> Home Page: http://gondor.apana.org.au/~herbert/
> PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
> --
> To unsubscribe from this list: send the line "unsubscribe ecryptfs" in
> the body of a message to majordomo at vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
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