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-rw-r--r--crypto/crypto_null.c28
1 files changed, 15 insertions, 13 deletions
diff --git a/crypto/crypto_null.c b/crypto/crypto_null.c
index f691d31..3fcf6e8 100644
--- a/crypto/crypto_null.c
+++ b/crypto/crypto_null.c
@@ -21,6 +21,7 @@
#include <linux/mm.h>
#include <asm/scatterlist.h>
#include <linux/crypto.h>
+#include <linux/string.h>
#define NULL_KEY_SIZE 0
#define NULL_BLOCK_SIZE 1
@@ -28,11 +29,13 @@
static int null_compress(void *ctx, const u8 *src, unsigned int slen,
u8 *dst, unsigned int *dlen)
-{ return 0; }
-
-static int null_decompress(void *ctx, const u8 *src, unsigned int slen,
- u8 *dst, unsigned int *dlen)
-{ return 0; }
+{
+ if (slen > *dlen)
+ return -EINVAL;
+ memcpy(dst, src, slen);
+ *dlen = slen;
+ return 0;
+}
static void null_init(void *ctx)
{ }
@@ -47,11 +50,10 @@ static int null_setkey(void *ctx, const u8 *key,
unsigned int keylen, u32 *flags)
{ return 0; }
-static void null_encrypt(void *ctx, u8 *dst, const u8 *src)
-{ }
-
-static void null_decrypt(void *ctx, u8 *dst, const u8 *src)
-{ }
+static void null_crypt(void *ctx, u8 *dst, const u8 *src)
+{
+ memcpy(dst, src, NULL_BLOCK_SIZE);
+}
static struct crypto_alg compress_null = {
.cra_name = "compress_null",
@@ -62,7 +64,7 @@ static struct crypto_alg compress_null = {
.cra_list = LIST_HEAD_INIT(compress_null.cra_list),
.cra_u = { .compress = {
.coa_compress = null_compress,
- .coa_decompress = null_decompress } }
+ .coa_decompress = null_compress } }
};
static struct crypto_alg digest_null = {
@@ -90,8 +92,8 @@ static struct crypto_alg cipher_null = {
.cia_min_keysize = NULL_KEY_SIZE,
.cia_max_keysize = NULL_KEY_SIZE,
.cia_setkey = null_setkey,
- .cia_encrypt = null_encrypt,
- .cia_decrypt = null_decrypt } }
+ .cia_encrypt = null_crypt,
+ .cia_decrypt = null_crypt } }
};
MODULE_ALIAS("compress_null");