eCryptfs: Use skcipher and shash

This patch replaces uses of ablkcipher and blkcipher with skcipher,
and the long obsolete hash interface with shash.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 48 insertions, 59 deletions

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 */