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 (file)
--- 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 void sha256_transform(u32 *state, const u8 *input)
 
 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 sha224_init(struct shash_desc *desc)
 
 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_init(struct shash_desc *desc)
 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_update(struct shash_desc *desc, const u8 *data,
 
 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 @@ static int sha224_final(struct shash_desc *desc, u8 *hash)
        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 @@ static struct shash_alg sha224 = {
        .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",

diff --git a/include/crypto/sha.h b/include/crypto/sha.h
index 922a248..88ef5eb 100644 (file)
--- a/include/crypto/sha.h
+++ b/include/crypto/sha.h
@@ -70,4 +70,10 @@ struct sha1_state {
        u8 buffer[SHA1_BLOCK_SIZE];
 };
 
+struct sha256_state {
+       u64 count;
+       u32 state[SHA256_DIGEST_SIZE / 4];
+       u8 buf[SHA256_BLOCK_SIZE];
+};
+
 #endif