crypto: sha256_generic - Add export/import support
This patch adds export/import support to sha256_generic. The exported
type is defined by struct sha256_state, which is basically the entire
descriptor state of sha256_generic.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/sha256_generic.c b/crypto/sha256_generic.c
index e58c71b..c48459e 100644
--- a/crypto/sha256_generic.c
+++ b/crypto/sha256_generic.c
@@ -25,12 +25,6 @@
#include <crypto/sha.h>
#include <asm/byteorder.h>
-struct sha256_ctx {
- u64 count;
- u32 state[8];
- u8 buf[128];
-};
-
static inline u32 Ch(u32 x, u32 y, u32 z)
{
return z ^ (x & (y ^ z));
@@ -222,7 +216,7 @@
static int sha224_init(struct shash_desc *desc)
{
- struct sha256_ctx *sctx = shash_desc_ctx(desc);
+ struct sha256_state *sctx = shash_desc_ctx(desc);
sctx->state[0] = SHA224_H0;
sctx->state[1] = SHA224_H1;
sctx->state[2] = SHA224_H2;
@@ -238,7 +232,7 @@
static int sha256_init(struct shash_desc *desc)
{
- struct sha256_ctx *sctx = shash_desc_ctx(desc);
+ struct sha256_state *sctx = shash_desc_ctx(desc);
sctx->state[0] = SHA256_H0;
sctx->state[1] = SHA256_H1;
sctx->state[2] = SHA256_H2;
@@ -255,7 +249,7 @@
static int sha256_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
- struct sha256_ctx *sctx = shash_desc_ctx(desc);
+ struct sha256_state *sctx = shash_desc_ctx(desc);
unsigned int partial, done;
const u8 *src;
@@ -286,7 +280,7 @@
static int sha256_final(struct shash_desc *desc, u8 *out)
{
- struct sha256_ctx *sctx = shash_desc_ctx(desc);
+ struct sha256_state *sctx = shash_desc_ctx(desc);
__be32 *dst = (__be32 *)out;
__be64 bits;
unsigned int index, pad_len;
@@ -326,12 +320,31 @@
return 0;
}
+static int sha256_export(struct shash_desc *desc, void *out)
+{
+ struct sha256_state *sctx = shash_desc_ctx(desc);
+
+ memcpy(out, sctx, sizeof(*sctx));
+ return 0;
+}
+
+static int sha256_import(struct shash_desc *desc, const void *in)
+{
+ struct sha256_state *sctx = shash_desc_ctx(desc);
+
+ memcpy(sctx, in, sizeof(*sctx));
+ return 0;
+}
+
static struct shash_alg sha256 = {
.digestsize = SHA256_DIGEST_SIZE,
.init = sha256_init,
.update = sha256_update,
.final = sha256_final,
- .descsize = sizeof(struct sha256_ctx),
+ .export = sha256_export,
+ .import = sha256_import,
+ .descsize = sizeof(struct sha256_state),
+ .statesize = sizeof(struct sha256_state),
.base = {
.cra_name = "sha256",
.cra_driver_name= "sha256-generic",
@@ -346,7 +359,7 @@
.init = sha224_init,
.update = sha256_update,
.final = sha224_final,
- .descsize = sizeof(struct sha256_ctx),
+ .descsize = sizeof(struct sha256_state),
.base = {
.cra_name = "sha224",
.cra_driver_name= "sha224-generic",