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[PATCH] eCryptfs: Hash code to new crypto API 

Update eCryptfs hash code to the new kernel crypto API.

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>
This commit is contained in:
Michael Halcrow 2006-10-30 22:07:17 -08:00 committed by Linus Torvalds
parent e5d9cbde6c
commit 565d9724b8
2 changed files with 25 additions and 18 deletions
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36
fs/ecryptfs/crypto.c
View File

@ -94,25 +94,31 @@ static int ecryptfs_calculate_md5(char *dst,
struct ecryptfs_crypt_stat *crypt_stat,
char *src, int len)
{
int rc = 0;
struct scatterlist sg;
struct hash_desc desc = {
.tfm = crypt_stat->hash_tfm,
.flags = CRYPTO_TFM_REQ_MAY_SLEEP
};
int rc = 0;
mutex_lock(&crypt_stat->cs_md5_tfm_mutex);
mutex_lock(&crypt_stat->cs_hash_tfm_mutex);
sg_init_one(&sg, (u8 *)src, len);
if (!crypt_stat->md5_tfm) {
crypt_stat->md5_tfm =
crypto_alloc_tfm("md5", CRYPTO_TFM_REQ_MAY_SLEEP);
if (!crypt_stat->md5_tfm) {
rc = -ENOMEM;
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);
ecryptfs_printk(KERN_ERR, "Error attempting to "
"allocate crypto context\n");
"allocate crypto context; rc = [%d]\n",
rc);
goto out;
}
crypt_stat->hash_tfm = desc.tfm;
}
crypto_digest_init(crypt_stat->md5_tfm);
crypto_digest_update(crypt_stat->md5_tfm, &sg, 1);
crypto_digest_final(crypt_stat->md5_tfm, dst);
mutex_unlock(&crypt_stat->cs_md5_tfm_mutex);
crypto_hash_init(&desc);
crypto_hash_update(&desc, &sg, len);
crypto_hash_final(&desc, dst);
mutex_unlock(&crypt_stat->cs_hash_tfm_mutex);
out:
return rc;
}
@ -178,7 +184,7 @@ ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat)
memset((void *)crypt_stat, 0, sizeof(struct ecryptfs_crypt_stat));
mutex_init(&crypt_stat->cs_mutex);
mutex_init(&crypt_stat->cs_tfm_mutex);
mutex_init(&crypt_stat->cs_md5_tfm_mutex);
mutex_init(&crypt_stat->cs_hash_tfm_mutex);
ECRYPTFS_SET_FLAG(crypt_stat->flags, ECRYPTFS_STRUCT_INITIALIZED);
}
@ -192,8 +198,8 @@ void ecryptfs_destruct_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat)
{
if (crypt_stat->tfm)
crypto_free_tfm(crypt_stat->tfm);
if (crypt_stat->md5_tfm)
crypto_free_tfm(crypt_stat->md5_tfm);
if (crypt_stat->hash_tfm)
crypto_free_hash(crypt_stat->hash_tfm);
memset(crypt_stat, 0, sizeof(struct ecryptfs_crypt_stat));
}

7
fs/ecryptfs/ecryptfs_kernel.h
View File

@ -175,6 +175,7 @@ ecryptfs_get_key_payload_data(struct key *key)
#define ECRYPTFS_DEFAULT_CIPHER "aes"
#define ECRYPTFS_DEFAULT_KEY_BYTES 16
#define ECRYPTFS_DEFAULT_CHAINING_MODE CRYPTO_TFM_MODE_CBC
#define ECRYPTFS_DEFAULT_HASH "md5"
#define ECRYPTFS_TAG_3_PACKET_TYPE 0x8C
#define ECRYPTFS_TAG_11_PACKET_TYPE 0xED
#define MD5_DIGEST_SIZE 16
@ -205,14 +206,14 @@ struct ecryptfs_crypt_stat {
unsigned int extent_mask;
struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
struct crypto_tfm *tfm;
struct crypto_tfm *md5_tfm; /* Crypto context for generating
* the initialization vectors */
struct crypto_hash *hash_tfm; /* Crypto context for generating
* the initialization vectors */
unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE];
unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES];
unsigned char keysigs[ECRYPTFS_MAX_NUM_KEYSIGS][ECRYPTFS_SIG_SIZE_HEX];
struct mutex cs_tfm_mutex;
struct mutex cs_md5_tfm_mutex;
struct mutex cs_hash_tfm_mutex;
struct mutex cs_mutex;
};