crypto: sha1_generic - Add export/import support
This patch adds export/import support to sha1_generic. The exported
type is defined by struct sha1_state, which is basically the entire
descriptor state of sha1_generic.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/sha1_generic.c b/crypto/sha1_generic.c
index 9efef20..0416091 100644
--- a/crypto/sha1_generic.c
+++ b/crypto/sha1_generic.c
@@ -25,31 +25,21 @@
#include <crypto/sha.h>
#include <asm/byteorder.h>
-struct sha1_ctx {
- u64 count;
- u32 state[5];
- u8 buffer[64];
-};
-
static int sha1_init(struct shash_desc *desc)
{
- struct sha1_ctx *sctx = shash_desc_ctx(desc);
+ struct sha1_state *sctx = shash_desc_ctx(desc);
- static const struct sha1_ctx initstate = {
- 0,
- { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
- { 0, }
+ *sctx = (struct sha1_state){
+ .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
};
- *sctx = initstate;
-
return 0;
}
static int sha1_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
- struct sha1_ctx *sctx = shash_desc_ctx(desc);
+ struct sha1_state *sctx = shash_desc_ctx(desc);
unsigned int partial, done;
const u8 *src;
@@ -85,7 +75,7 @@
/* Add padding and return the message digest. */
static int sha1_final(struct shash_desc *desc, u8 *out)
{
- struct sha1_ctx *sctx = shash_desc_ctx(desc);
+ struct sha1_state *sctx = shash_desc_ctx(desc);
__be32 *dst = (__be32 *)out;
u32 i, index, padlen;
__be64 bits;
@@ -111,12 +101,31 @@
return 0;
}
+static int sha1_export(struct shash_desc *desc, void *out)
+{
+ struct sha1_state *sctx = shash_desc_ctx(desc);
+
+ memcpy(out, sctx, sizeof(*sctx));
+ return 0;
+}
+
+static int sha1_import(struct shash_desc *desc, const void *in)
+{
+ struct sha1_state *sctx = shash_desc_ctx(desc);
+
+ memcpy(sctx, in, sizeof(*sctx));
+ return 0;
+}
+
static struct shash_alg alg = {
.digestsize = SHA1_DIGEST_SIZE,
.init = sha1_init,
.update = sha1_update,
.final = sha1_final,
- .descsize = sizeof(struct sha1_ctx),
+ .export = sha1_export,
+ .import = sha1_import,
+ .descsize = sizeof(struct sha1_state),
+ .statesize = sizeof(struct sha1_state),
.base = {
.cra_name = "sha1",
.cra_driver_name= "sha1-generic",
diff --git a/include/crypto/sha.h b/include/crypto/sha.h
index c0ccc2b..922a248 100644
--- a/include/crypto/sha.h
+++ b/include/crypto/sha.h
@@ -5,6 +5,8 @@
#ifndef _CRYPTO_SHA_H
#define _CRYPTO_SHA_H
+#include <linux/types.h>
+
#define SHA1_DIGEST_SIZE 20
#define SHA1_BLOCK_SIZE 64
@@ -62,4 +64,10 @@
#define SHA512_H6 0x1f83d9abfb41bd6bULL
#define SHA512_H7 0x5be0cd19137e2179ULL
+struct sha1_state {
+ u64 count;
+ u32 state[SHA1_DIGEST_SIZE / 4];
+ u8 buffer[SHA1_BLOCK_SIZE];
+};
+
#endif