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Subject[55/93] crypto: padlock-sha - Add import/export support
2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Herbert Xu <herbert@gondor.apana.org.au>

commit a8d7ac279743077965afeca0c9ed748507b68e89 upstream.

As the padlock driver for SHA uses a software fallback to perform
partial hashing, it must implement custom import/export functions.
Otherwise hmac which depends on import/export for prehashing will
not work with padlock-sha.

Reported-by: Wolfgang Walter <wolfgang.walter@stwm.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/crypto/padlock-sha.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)

--- a/drivers/crypto/padlock-sha.c
+++ b/drivers/crypto/padlock-sha.c
@@ -57,6 +57,23 @@ static int padlock_sha_update(struct sha
return crypto_shash_update(&dctx->fallback, data, length);
}

+static int padlock_sha_export(struct shash_desc *desc, void *out)
+{
+ struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
+
+ return crypto_shash_export(&dctx->fallback, out);
+}
+
+static int padlock_sha_import(struct shash_desc *desc, const void *in)
+{
+ struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
+ struct padlock_sha_ctx *ctx = crypto_shash_ctx(desc->tfm);
+
+ dctx->fallback.tfm = ctx->fallback;
+ dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
+ return crypto_shash_import(&dctx->fallback, in);
+}
+
static inline void padlock_output_block(uint32_t *src,
uint32_t *dst, size_t count)
{
@@ -235,7 +252,10 @@ static struct shash_alg sha1_alg = {
.update = padlock_sha_update,
.finup = padlock_sha1_finup,
.final = padlock_sha1_final,
+ .export = padlock_sha_export,
+ .import = padlock_sha_import,
.descsize = sizeof(struct padlock_sha_desc),
+ .statesize = sizeof(struct sha1_state),
.base = {
.cra_name = "sha1",
.cra_driver_name = "sha1-padlock",
@@ -256,7 +276,10 @@ static struct shash_alg sha256_alg = {
.update = padlock_sha_update,
.finup = padlock_sha256_finup,
.final = padlock_sha256_final,
+ .export = padlock_sha_export,
+ .import = padlock_sha_import,
.descsize = sizeof(struct padlock_sha_desc),
+ .statesize = sizeof(struct sha256_state),
.base = {
.cra_name = "sha256",
.cra_driver_name = "sha256-padlock",



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