[PATCH 2/6] eCryptfs: Hash code to new crypto API

Michael Halcrow
2006-10-30T23:35:53Z

Update eCryptfs hash code to the new kernel crypto API.

Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>

---

fs/ecryptfs/crypto.c | 36 +++++++++++++++++++++---------------
fs/ecryptfs/ecryptfs_kernel.h | 7 ++++---
2 files changed, 25 insertions(+), 18 deletions(-)

33eaa8582847bd8cef8b69537bee03f91fa5a28b
diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index 82e7d02..f14c5a3 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -94,25 +94,31 @@ static int ecryptfs_calculate_md5(char *
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
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
{
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));
}

diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index 4112df9..840aa01 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -175,6 +175,7 @@ #define ECRYPTFS_FILE_SIZE_BYTES 8
#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 @@ #define ECRYPTFS_KEY_VALID 0x00
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;
};

--
1.3.3