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Subject[PATCH v2 1/6] crypto: ccree: fix finup
Date
From: Hadar Gat <hadar.gat@arm.com>

finup() operation was incorrect, padding was missing.
Fix by setting the ccree HW to enable padding.

Signed-off-by: Hadar Gat <hadar.gat@arm.com>
[ gilad@benyossef.com: refactored for better code sharing ]
Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Cc: stable@vger.kernel.org
---
drivers/crypto/ccree/cc_hash.c | 81 +++++++++---------------------------------
1 file changed, 16 insertions(+), 65 deletions(-)

diff --git a/drivers/crypto/ccree/cc_hash.c b/drivers/crypto/ccree/cc_hash.c
index 96ff777..e4ebde0 100644
--- a/drivers/crypto/ccree/cc_hash.c
+++ b/drivers/crypto/ccree/cc_hash.c
@@ -602,66 +602,7 @@ static int cc_hash_update(struct ahash_request *req)
return rc;
}

-static int cc_hash_finup(struct ahash_request *req)
-{
- struct ahash_req_ctx *state = ahash_request_ctx(req);
- struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
- struct cc_hash_ctx *ctx = crypto_ahash_ctx(tfm);
- u32 digestsize = crypto_ahash_digestsize(tfm);
- struct scatterlist *src = req->src;
- unsigned int nbytes = req->nbytes;
- u8 *result = req->result;
- struct device *dev = drvdata_to_dev(ctx->drvdata);
- bool is_hmac = ctx->is_hmac;
- struct cc_crypto_req cc_req = {};
- struct cc_hw_desc desc[CC_MAX_HASH_SEQ_LEN];
- unsigned int idx = 0;
- int rc;
- gfp_t flags = cc_gfp_flags(&req->base);
-
- dev_dbg(dev, "===== %s-finup (%d) ====\n", is_hmac ? "hmac" : "hash",
- nbytes);
-
- if (cc_map_req(dev, state, ctx)) {
- dev_err(dev, "map_ahash_source() failed\n");
- return -EINVAL;
- }
-
- if (cc_map_hash_request_final(ctx->drvdata, state, src, nbytes, 1,
- flags)) {
- dev_err(dev, "map_ahash_request_final() failed\n");
- cc_unmap_req(dev, state, ctx);
- return -ENOMEM;
- }
- if (cc_map_result(dev, state, digestsize)) {
- dev_err(dev, "map_ahash_digest() failed\n");
- cc_unmap_hash_request(dev, state, src, true);
- cc_unmap_req(dev, state, ctx);
- return -ENOMEM;
- }
-
- /* Setup request structure */
- cc_req.user_cb = cc_hash_complete;
- cc_req.user_arg = req;
-
- idx = cc_restore_hash(desc, ctx, state, idx);
-
- if (is_hmac)
- idx = cc_fin_hmac(desc, req, idx);
-
- idx = cc_fin_result(desc, req, idx);
-
- rc = cc_send_request(ctx->drvdata, &cc_req, desc, idx, &req->base);
- if (rc != -EINPROGRESS && rc != -EBUSY) {
- dev_err(dev, "send_request() failed (rc=%d)\n", rc);
- cc_unmap_hash_request(dev, state, src, true);
- cc_unmap_result(dev, state, digestsize, result);
- cc_unmap_req(dev, state, ctx);
- }
- return rc;
-}
-
-static int cc_hash_final(struct ahash_request *req)
+static int cc_do_finup(struct ahash_request *req, bool update)
{
struct ahash_req_ctx *state = ahash_request_ctx(req);
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
@@ -678,21 +619,20 @@ static int cc_hash_final(struct ahash_request *req)
int rc;
gfp_t flags = cc_gfp_flags(&req->base);

- dev_dbg(dev, "===== %s-final (%d) ====\n", is_hmac ? "hmac" : "hash",
- nbytes);
+ dev_dbg(dev, "===== %s-%s (%d) ====\n", is_hmac ? "hmac" : "hash",
+ update ? "finup" : "final", nbytes);

if (cc_map_req(dev, state, ctx)) {
dev_err(dev, "map_ahash_source() failed\n");
return -EINVAL;
}

- if (cc_map_hash_request_final(ctx->drvdata, state, src, nbytes, 0,
+ if (cc_map_hash_request_final(ctx->drvdata, state, src, nbytes, update,
flags)) {
dev_err(dev, "map_ahash_request_final() failed\n");
cc_unmap_req(dev, state, ctx);
return -ENOMEM;
}
-
if (cc_map_result(dev, state, digestsize)) {
dev_err(dev, "map_ahash_digest() failed\n");
cc_unmap_hash_request(dev, state, src, true);
@@ -706,7 +646,7 @@ static int cc_hash_final(struct ahash_request *req)

idx = cc_restore_hash(desc, ctx, state, idx);

- /* "DO-PAD" must be enabled only when writing current length to HW */
+ /* Pad the hash */
hw_desc_init(&desc[idx]);
set_cipher_do(&desc[idx], DO_PAD);
set_cipher_mode(&desc[idx], ctx->hw_mode);
@@ -731,6 +671,17 @@ static int cc_hash_final(struct ahash_request *req)
return rc;
}

+static int cc_hash_finup(struct ahash_request *req)
+{
+ return cc_do_finup(req, true);
+}
+
+
+static int cc_hash_final(struct ahash_request *req)
+{
+ return cc_do_finup(req, false);
+}
+
static int cc_hash_init(struct ahash_request *req)
{
struct ahash_req_ctx *state = ahash_request_ctx(req);
--
2.7.4
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