[PATCH] eCryptfs: Clean up crypto initialization
Clean up the crypto initialization code; let the crypto API take care of the
key size checks.
Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index ed35a9712..82e7d02 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -1573,35 +1573,26 @@
/**
* ecryptfs_process_cipher - Perform cipher initialization.
- * @tfm: Crypto context set by this function
* @key_tfm: Crypto context for key material, set by this function
- * @cipher_name: Name of the cipher.
- * @key_size: Size of the key in bytes.
+ * @cipher_name: Name of the cipher
+ * @key_size: Size of the key in bytes
*
* Returns zero on success. Any crypto_tfm structs allocated here
* should be released by other functions, such as on a superblock put
* event, regardless of whether this function succeeds for fails.
*/
int
-ecryptfs_process_cipher(struct crypto_tfm **tfm, struct crypto_tfm **key_tfm,
- char *cipher_name, size_t key_size)
+ecryptfs_process_cipher(struct crypto_tfm **key_tfm, char *cipher_name,
+ size_t *key_size)
{
char dummy_key[ECRYPTFS_MAX_KEY_BYTES];
int rc;
- *tfm = *key_tfm = NULL;
- if (key_size > ECRYPTFS_MAX_KEY_BYTES) {
+ *key_tfm = NULL;
+ if (*key_size > ECRYPTFS_MAX_KEY_BYTES) {
rc = -EINVAL;
printk(KERN_ERR "Requested key size is [%Zd] bytes; maximum "
- "allowable is [%d]\n", key_size, ECRYPTFS_MAX_KEY_BYTES);
- goto out;
- }
- *tfm = crypto_alloc_tfm(cipher_name, (ECRYPTFS_DEFAULT_CHAINING_MODE
- | CRYPTO_TFM_REQ_WEAK_KEY));
- if (!(*tfm)) {
- rc = -EINVAL;
- printk(KERN_ERR "Unable to allocate crypto cipher with name "
- "[%s]\n", cipher_name);
+ "allowable is [%d]\n", *key_size, ECRYPTFS_MAX_KEY_BYTES);
goto out;
}
*key_tfm = crypto_alloc_tfm(cipher_name, CRYPTO_TFM_REQ_WEAK_KEY);
@@ -1611,46 +1602,13 @@
"[%s]\n", cipher_name);
goto out;
}
- if (key_size < crypto_tfm_alg_min_keysize(*tfm)) {
- rc = -EINVAL;
- printk(KERN_ERR "Request key size is [%Zd]; minimum key size "
- "supported by cipher [%s] is [%d]\n", key_size,
- cipher_name, crypto_tfm_alg_min_keysize(*tfm));
- goto out;
- }
- if (key_size < crypto_tfm_alg_min_keysize(*key_tfm)) {
- rc = -EINVAL;
- printk(KERN_ERR "Request key size is [%Zd]; minimum key size "
- "supported by cipher [%s] is [%d]\n", key_size,
- cipher_name, crypto_tfm_alg_min_keysize(*key_tfm));
- goto out;
- }
- if (key_size > crypto_tfm_alg_max_keysize(*tfm)) {
- rc = -EINVAL;
- printk(KERN_ERR "Request key size is [%Zd]; maximum key size "
- "supported by cipher [%s] is [%d]\n", key_size,
- cipher_name, crypto_tfm_alg_min_keysize(*tfm));
- goto out;
- }
- if (key_size > crypto_tfm_alg_max_keysize(*key_tfm)) {
- rc = -EINVAL;
- printk(KERN_ERR "Request key size is [%Zd]; maximum key size "
- "supported by cipher [%s] is [%d]\n", key_size,
- cipher_name, crypto_tfm_alg_min_keysize(*key_tfm));
- goto out;
- }
- get_random_bytes(dummy_key, key_size);
- rc = crypto_cipher_setkey(*tfm, dummy_key, key_size);
+ if (*key_size == 0)
+ *key_size = crypto_tfm_alg_max_keysize(*key_tfm);
+ get_random_bytes(dummy_key, *key_size);
+ rc = crypto_cipher_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, cipher_name, rc);
- rc = -EINVAL;
- goto out;
- }
- rc = crypto_cipher_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, cipher_name, rc);
+ "cipher [%s]; rc = [%d]\n", *key_size, cipher_name, rc);
rc = -EINVAL;
goto out;
}