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ecryptfs: remove private bin2hex implementation

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Calling sprintf in a loop is not very efficient, and in any case, we
already have an implementation of bin-to-hex conversion in lib/ which
we might as well use.

Note that ecryptfs_to_hex used to nul-terminate the destination (and
the kernel doc was wrong about the required output size), while
bin2hex doesn't. [All but one user of ecryptfs_to_hex explicitly
nul-terminates the result anyway.]

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
[tyhicks: Include <linux/kernel.h> in ecryptfs_kernel.h]
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
This commit is contained in:
Rasmus Villemoes 2016-09-21 01:17:24 +02:00 committed by Tyler Hicks
parent 0996b67df6
commit abbae6d560
2 changed files with 8 additions and 16 deletions
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15
fs/ecryptfs/crypto.c
View file

@ -41,21 +41,6 @@
#define DECRYPT 0
#define ENCRYPT 1
/**
* ecryptfs_to_hex
* @dst: Buffer to take hex character representation of contents of
* src; must be at least of size (src_size * 2)
* @src: Buffer to be converted to a hex string representation
* @src_size: number of bytes to convert
*/
void ecryptfs_to_hex(char *dst, char *src, size_t src_size)
{
int x;
for (x = 0; x < src_size; x++)
sprintf(&dst[x * 2], "%.2x", (unsigned char)src[x]);
}
/**
* ecryptfs_from_hex
* @dst: Buffer to take the bytes from src hex; must be at least of

9
fs/ecryptfs/ecryptfs_kernel.h
View file

@ -31,6 +31,7 @@
#include <crypto/skcipher.h>
#include <keys/user-type.h>
#include <keys/encrypted-type.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/fs_stack.h>
#include <linux/namei.h>
@ -51,7 +52,13 @@
#define ECRYPTFS_XATTR_NAME "user.ecryptfs"
void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok);
extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size);
static inline void
ecryptfs_to_hex(char *dst, char *src, size_t src_size)
{
char *end = bin2hex(dst, src, src_size);
*end = '\0';
}
extern void ecryptfs_from_hex(char *dst, char *src, int dst_size);
struct ecryptfs_key_record {