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authorPatrick McHardy <kaber@trash.net>2005-05-16 21:53:41 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-17 07:59:18 -0700
commitd0856009dbaf8eca2269d4129bb83940c0d95054 (patch)
treee6c10d133f04ece55250f2fd84fc2b376624b8cd /crypto
parentba32311eb73f624a85a5fc2e043cda8e076f86ef (diff)
downloadlinux-stericsson-d0856009dbaf8eca2269d4129bb83940c0d95054.tar.gz
[PATCH] crypto: fix null encryption/compression
null_encrypt() needs to copy the data in case src and dst are disjunct, null_compress() needs to copy the data in any case as far as I can tell. I joined compress/decompress and encrypt/decrypt to avoid duplicating code. Without this patch ESP null_enc packets look like this: IP (tos 0x0, ttl 64, id 23130, offset 0, flags [DF], length: 128) 10.0.0.1 > 10.0.0.2: ESP(spi=0x0f9ca149,seq=0x4) 0x0000: 4500 0080 5a5a 4000 4032 cbef 0a00 0001 E...ZZ@.@2...... 0x0010: 0a00 0002 0f9c a149 0000 0004 0000 0000 .......I........ 0x0020: 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0030: 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0040: 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0050: 0000 .. IP (tos 0x0, ttl 64, id 256, offset 0, flags [DF], length: 128) 10.0.0.2 > 10.0.0.1: ESP(spi=0x0e4f7b51,seq=0x2) 0x0000: 4500 0080 0100 4000 4032 254a 0a00 0002 E.....@.@2%J.... 0x0010: 0a00 0001 0e4f 7b51 0000 0002 a8a8 a8a8 .....O{Q........ 0x0020: a8a8 a8a8 a8a8 a8a8 a8a8 a8a8 a8a8 a8a8 ................ 0x0030: a8a8 a8a8 a8a8 a8a8 a8a8 a8a8 a8a8 a8a8 ................ 0x0040: a8a8 a8a8 a8a8 a8a8 a8a8 a8a8 a8a8 a8a8 ................ 0x0050: a8a8 .. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'crypto')
-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 f691d31fa9ee..3fcf6e887e87 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");