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Commit 3f32a5be authored by Herbert Xu's avatar Herbert Xu
Browse files

ext4: Use skcipher 



This patch replaces uses of ablkcipher with skcipher.

Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 9651ddba

fs/ext4/crypto.c

+11 −13
Original line number Diff line number Diff line
@@ -18,11 +18,9 @@ 
 * Special Publication 800-38E and IEEE P1619/D16.

 */



#include <crypto/hash.h>

#include <crypto/sha.h>

#include <crypto/skcipher.h>

#include <keys/user-type.h>

#include <keys/encrypted-type.h>

#include <linux/crypto.h>

#include <linux/ecryptfs.h>

#include <linux/gfp.h>

#include <linux/kernel.h>
@@ -261,21 +259,21 @@ static int ext4_page_crypto(struct inode *inode, 


{

	u8 xts_tweak[EXT4_XTS_TWEAK_SIZE];

	struct ablkcipher_request *req = NULL;

	struct skcipher_request *req = NULL;

	DECLARE_EXT4_COMPLETION_RESULT(ecr);

	struct scatterlist dst, src;

	struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;

	struct crypto_ablkcipher *tfm = ci->ci_ctfm;

	struct crypto_skcipher *tfm = ci->ci_ctfm;

	int res = 0;



	req = ablkcipher_request_alloc(tfm, GFP_NOFS);

	req = skcipher_request_alloc(tfm, GFP_NOFS);

	if (!req) {

		printk_ratelimited(KERN_ERR

				   "%s: crypto_request_alloc() failed\n",

				   __func__);

		return -ENOMEM;

	}

	ablkcipher_request_set_callback(

	skcipher_request_set_callback(

		req, CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,

		ext4_crypt_complete, &ecr);
@@ -288,21 +286,21 @@ static int ext4_page_crypto(struct inode *inode, 
	sg_set_page(&dst, dest_page, PAGE_CACHE_SIZE, 0);

	sg_init_table(&src, 1);

	sg_set_page(&src, src_page, PAGE_CACHE_SIZE, 0);

	ablkcipher_request_set_crypt(req, &src, &dst, PAGE_CACHE_SIZE,

	skcipher_request_set_crypt(req, &src, &dst, PAGE_CACHE_SIZE,

				   xts_tweak);

	if (rw == EXT4_DECRYPT)

		res = crypto_ablkcipher_decrypt(req);

		res = crypto_skcipher_decrypt(req);

	else

		res = crypto_ablkcipher_encrypt(req);

		res = crypto_skcipher_encrypt(req);

	if (res == -EINPROGRESS || res == -EBUSY) {

		wait_for_completion(&ecr.completion);

		res = ecr.res;

	}

	ablkcipher_request_free(req);

	skcipher_request_free(req);

	if (res) {

		printk_ratelimited(

			KERN_ERR

			"%s: crypto_ablkcipher_encrypt() returned %d\n",

			"%s: crypto_skcipher_encrypt() returned %d\n",

			__func__, res);

		return res;

	}

fs/ext4/crypto_fname.c

+15 −17
Original line number Diff line number Diff line
@@ -11,11 +11,9 @@ 
 *

 */



#include <crypto/hash.h>

#include <crypto/sha.h>

#include <crypto/skcipher.h>

#include <keys/encrypted-type.h>

#include <keys/user-type.h>

#include <linux/crypto.h>

#include <linux/gfp.h>

#include <linux/kernel.h>

#include <linux/key.h>
@@ -65,10 +63,10 @@ static int ext4_fname_encrypt(struct inode *inode, 
			      struct ext4_str *oname)

{

	u32 ciphertext_len;

	struct ablkcipher_request *req = NULL;

	struct skcipher_request *req = NULL;

	DECLARE_EXT4_COMPLETION_RESULT(ecr);

	struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;

	struct crypto_ablkcipher *tfm = ci->ci_ctfm;

	struct crypto_skcipher *tfm = ci->ci_ctfm;

	int res = 0;

	char iv[EXT4_CRYPTO_BLOCK_SIZE];

	struct scatterlist src_sg, dst_sg;
@@ -95,14 +93,14 @@ static int ext4_fname_encrypt(struct inode *inode, 
	}



	/* Allocate request */

	req = ablkcipher_request_alloc(tfm, GFP_NOFS);

	req = skcipher_request_alloc(tfm, GFP_NOFS);

	if (!req) {

		printk_ratelimited(

		    KERN_ERR "%s: crypto_request_alloc() failed\n", __func__);

		kfree(alloc_buf);

		return -ENOMEM;

	}

	ablkcipher_request_set_callback(req,

	skcipher_request_set_callback(req,

		CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,

		ext4_dir_crypt_complete, &ecr);
@@ -117,14 +115,14 @@ static int ext4_fname_encrypt(struct inode *inode, 
	/* Create encryption request */

	sg_init_one(&src_sg, workbuf, ciphertext_len);

	sg_init_one(&dst_sg, oname->name, ciphertext_len);

	ablkcipher_request_set_crypt(req, &src_sg, &dst_sg, ciphertext_len, iv);

	res = crypto_ablkcipher_encrypt(req);

	skcipher_request_set_crypt(req, &src_sg, &dst_sg, ciphertext_len, iv);

	res = crypto_skcipher_encrypt(req);

	if (res == -EINPROGRESS || res == -EBUSY) {

		wait_for_completion(&ecr.completion);

		res = ecr.res;

	}

	kfree(alloc_buf);

	ablkcipher_request_free(req);

	skcipher_request_free(req);

	if (res < 0) {

		printk_ratelimited(

		    KERN_ERR "%s: Error (error code %d)\n", __func__, res);
@@ -145,11 +143,11 @@ static int ext4_fname_decrypt(struct inode *inode, 
			      struct ext4_str *oname)

{

	struct ext4_str tmp_in[2], tmp_out[1];

	struct ablkcipher_request *req = NULL;

	struct skcipher_request *req = NULL;

	DECLARE_EXT4_COMPLETION_RESULT(ecr);

	struct scatterlist src_sg, dst_sg;

	struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;

	struct crypto_ablkcipher *tfm = ci->ci_ctfm;

	struct crypto_skcipher *tfm = ci->ci_ctfm;

	int res = 0;

	char iv[EXT4_CRYPTO_BLOCK_SIZE];

	unsigned lim = max_name_len(inode);
@@ -162,13 +160,13 @@ static int ext4_fname_decrypt(struct inode *inode, 
	tmp_out[0].name = oname->name;



	/* Allocate request */

	req = ablkcipher_request_alloc(tfm, GFP_NOFS);

	req = skcipher_request_alloc(tfm, GFP_NOFS);

	if (!req) {

		printk_ratelimited(

		    KERN_ERR "%s: crypto_request_alloc() failed\n",  __func__);

		return -ENOMEM;

	}

	ablkcipher_request_set_callback(req,

	skcipher_request_set_callback(req,

		CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,

		ext4_dir_crypt_complete, &ecr);
@@ -178,13 +176,13 @@ static int ext4_fname_decrypt(struct inode *inode, 
	/* Create encryption request */

	sg_init_one(&src_sg, iname->name, iname->len);

	sg_init_one(&dst_sg, oname->name, oname->len);

	ablkcipher_request_set_crypt(req, &src_sg, &dst_sg, iname->len, iv);

	res = crypto_ablkcipher_decrypt(req);

	skcipher_request_set_crypt(req, &src_sg, &dst_sg, iname->len, iv);

	res = crypto_skcipher_decrypt(req);

	if (res == -EINPROGRESS || res == -EBUSY) {

		wait_for_completion(&ecr.completion);

		res = ecr.res;

	}

	ablkcipher_request_free(req);

	skcipher_request_free(req);

	if (res < 0) {

		printk_ratelimited(

		    KERN_ERR "%s: Error in ext4_fname_encrypt (error code %d)\n",

fs/ext4/crypto_key.c

+20 −22
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 
 * Written by Michael Halcrow, Ildar Muslukhov, and Uday Savagaonkar, 2015.

 */



#include <crypto/skcipher.h>

#include <keys/encrypted-type.h>

#include <keys/user-type.h>

#include <linux/random.h>
@@ -41,45 +42,42 @@ static int ext4_derive_key_aes(char deriving_key[EXT4_AES_128_ECB_KEY_SIZE], 
			       char derived_key[EXT4_AES_256_XTS_KEY_SIZE])

{

	int res = 0;

	struct ablkcipher_request *req = NULL;

	struct skcipher_request *req = NULL;

	DECLARE_EXT4_COMPLETION_RESULT(ecr);

	struct scatterlist src_sg, dst_sg;

	struct crypto_ablkcipher *tfm = crypto_alloc_ablkcipher("ecb(aes)", 0,

								0);

	struct crypto_skcipher *tfm = crypto_alloc_skcipher("ecb(aes)", 0, 0);



	if (IS_ERR(tfm)) {

		res = PTR_ERR(tfm);

		tfm = NULL;

		goto out;

	}

	crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_REQ_WEAK_KEY);

	req = ablkcipher_request_alloc(tfm, GFP_NOFS);

	crypto_skcipher_set_flags(tfm, CRYPTO_TFM_REQ_WEAK_KEY);

	req = skcipher_request_alloc(tfm, GFP_NOFS);

	if (!req) {

		res = -ENOMEM;

		goto out;

	}

	ablkcipher_request_set_callback(req,

	skcipher_request_set_callback(req,

			CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,

			derive_crypt_complete, &ecr);

	res = crypto_ablkcipher_setkey(tfm, deriving_key,

	res = crypto_skcipher_setkey(tfm, deriving_key,

				     EXT4_AES_128_ECB_KEY_SIZE);

	if (res < 0)

		goto out;

	sg_init_one(&src_sg, source_key, EXT4_AES_256_XTS_KEY_SIZE);

	sg_init_one(&dst_sg, derived_key, EXT4_AES_256_XTS_KEY_SIZE);

	ablkcipher_request_set_crypt(req, &src_sg, &dst_sg,

	skcipher_request_set_crypt(req, &src_sg, &dst_sg,

				   EXT4_AES_256_XTS_KEY_SIZE, NULL);

	res = crypto_ablkcipher_encrypt(req);

	res = crypto_skcipher_encrypt(req);

	if (res == -EINPROGRESS || res == -EBUSY) {

		wait_for_completion(&ecr.completion);

		res = ecr.res;

	}



out:

	if (req)

		ablkcipher_request_free(req);

	if (tfm)

		crypto_free_ablkcipher(tfm);

	skcipher_request_free(req);

	crypto_free_skcipher(tfm);

	return res;

}
@@ -90,7 +88,7 @@ void ext4_free_crypt_info(struct ext4_crypt_info *ci) 


	if (ci->ci_keyring_key)

		key_put(ci->ci_keyring_key);

	crypto_free_ablkcipher(ci->ci_ctfm);

	crypto_free_skcipher(ci->ci_ctfm);

	kmem_cache_free(ext4_crypt_info_cachep, ci);

}
@@ -122,7 +120,7 @@ int _ext4_get_encryption_info(struct inode *inode) 
	struct ext4_encryption_context ctx;

	const struct user_key_payload *ukp;

	struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);

	struct crypto_ablkcipher *ctfm;

	struct crypto_skcipher *ctfm;

	const char *cipher_str;

	char raw_key[EXT4_MAX_KEY_SIZE];

	char mode;
@@ -237,7 +235,7 @@ int _ext4_get_encryption_info(struct inode *inode) 
	if (res)

		goto out;

got_key:

	ctfm = crypto_alloc_ablkcipher(cipher_str, 0, 0);

	ctfm = crypto_alloc_skcipher(cipher_str, 0, 0);

	if (!ctfm || IS_ERR(ctfm)) {

		res = ctfm ? PTR_ERR(ctfm) : -ENOMEM;

		printk(KERN_DEBUG
@@ -246,10 +244,10 @@ int _ext4_get_encryption_info(struct inode *inode) 
		goto out;

	}

	crypt_info->ci_ctfm = ctfm;

	crypto_ablkcipher_clear_flags(ctfm, ~0);

	crypto_tfm_set_flags(crypto_ablkcipher_tfm(ctfm),

	crypto_skcipher_clear_flags(ctfm, ~0);

	crypto_tfm_set_flags(crypto_skcipher_tfm(ctfm),

			     CRYPTO_TFM_REQ_WEAK_KEY);

	res = crypto_ablkcipher_setkey(ctfm, raw_key,

	res = crypto_skcipher_setkey(ctfm, raw_key,

				     ext4_encryption_key_size(mode));

	if (res)

		goto out;

fs/ext4/ext4_crypto.h

+1 −1
Original line number Diff line number Diff line
@@ -77,7 +77,7 @@ struct ext4_crypt_info { 
	char		ci_data_mode;

	char		ci_filename_mode;

	char		ci_flags;

	struct crypto_ablkcipher *ci_ctfm;

	struct crypto_skcipher *ci_ctfm;

	struct key	*ci_keyring_key;

	char		ci_master_key[EXT4_KEY_DESCRIPTOR_SIZE];

};