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Subject[PATCH 01/04] Adding cipher mode context information to crypto_tfm
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This patch adds the ability for a cipher mode to store cipher mode specific
information in crypto_tfm. This is necessary for LRW's precomputed
GF-multiplication tables.

Signed-off-by: Fruhwirth Clemens <clemens@endorphin.org>

--- 0/crypto/api.c 2005-01-20 10:15:22.000000000 +0100
+++ 1/crypto/api.c 2005-01-20 10:15:40.000000000 +0100
@@ -3,6 +3,7 @@
*
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
* Copyright (c) 2002 David S. Miller (davem@redhat.com)
+ * Copyright (c) 2004 Clemens Fruhwirth <clemens@endorphin.org>
*
* Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
* and Nettle, by Niels M�ller.
@@ -23,6 +24,14 @@
LIST_HEAD(crypto_alg_list);
DECLARE_RWSEM(crypto_alg_sem);

+static inline int crypto_cmctx_size(u32 flags)
+{
+ switch(flags & CRYPTO_TFM_MODE_MASK) {
+ default:
+ return 0;
+ }
+}
+
static inline int crypto_alg_get(struct crypto_alg *alg)
{
return try_module_get(alg->cra_module);
@@ -121,16 +130,18 @@
{
struct crypto_tfm *tfm = NULL;
struct crypto_alg *alg;
+ int tfm_size;

alg = crypto_alg_mod_lookup(name);
if (alg == NULL)
goto out;

- tfm = kmalloc(sizeof(*tfm) + alg->cra_ctxsize, GFP_KERNEL);
+ tfm_size = sizeof(*tfm) + alg->cra_ctxsize + crypto_cmctx_size(flags);
+ tfm = kmalloc(tfm_size, GFP_KERNEL);
if (tfm == NULL)
goto out_put;

- memset(tfm, 0, sizeof(*tfm) + alg->cra_ctxsize);
+ memset(tfm, 0, tfm_size);

tfm->__crt_alg = alg;

@@ -156,7 +167,7 @@
void crypto_free_tfm(struct crypto_tfm *tfm)
{
struct crypto_alg *alg = tfm->__crt_alg;
- int size = sizeof(*tfm) + alg->cra_ctxsize;
+ int size = sizeof(*tfm) + alg->cra_ctxsize + crypto_cmctx_size(tfm->crt_cipher.cit_mode);

crypto_exit_ops(tfm);
crypto_alg_put(alg);
--- 0/crypto/internal.h 2005-01-20 10:15:22.000000000 +0100
+++ 1/crypto/internal.h 2005-01-20 10:15:40.000000000 +0100
@@ -47,6 +47,11 @@
return (void *)&tfm[1];
}

+static inline void *crypto_tfm_cmctx(struct crypto_tfm *tfm)
+{
+ return ((char *)&tfm[1]) + tfm->__crt_alg->cra_ctxsize;
+}
+
struct crypto_alg *crypto_alg_lookup(const char *name);

/* A far more intelligent version of this is planned. For now, just
-
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