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authorLee Nipper <lee.nipper@gmail.com>2010-06-16 15:29:15 +1000
committerHerbert Xu <herbert@gondor.apana.org.au>2010-06-16 15:29:15 +1000
commit5e833bc4166ea524c00a95e777e4344844ed189f (patch)
tree5b53201c04a434464fc68379ac2989cf8fd8027a /drivers/crypto/talitos.c
parent5b04fc170382195d7d33fd08e3ccc2ad8e50e782 (diff)
downloadlinux-linaro-stable-5e833bc4166ea524c00a95e777e4344844ed189f.tar.gz
crypto: talitos - fix ahash for multiple of blocksize
Correct ahash_process_req() to properly handle cases where the total hash amount is a multiple of the blocksize. The SEC must have some data to hash during the very last descriptor operation; so up to one whole blocksize of data is buffered until the final hash. Signed-off-by: Lee Nipper <lee.nipper@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/talitos.c')
-rw-r--r--drivers/crypto/talitos.c77
1 files changed, 40 insertions, 37 deletions
diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index 637c105f53d2..0f2483e221ad 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -720,7 +720,6 @@ struct talitos_ctx {
#define TALITOS_MDEU_MAX_CONTEXT_SIZE TALITOS_MDEU_CONTEXT_SIZE_SHA384_SHA512
struct talitos_ahash_req_ctx {
- u64 count;
u32 hw_context[TALITOS_MDEU_MAX_CONTEXT_SIZE / sizeof(u32)];
unsigned int hw_context_size;
u8 buf[HASH_MAX_BLOCK_SIZE];
@@ -729,6 +728,7 @@ struct talitos_ahash_req_ctx {
unsigned int first;
unsigned int last;
unsigned int to_hash_later;
+ u64 nbuf;
struct scatterlist bufsl[2];
struct scatterlist *psrc;
};
@@ -1609,6 +1609,7 @@ static void ahash_done(struct device *dev,
if (!req_ctx->last && req_ctx->to_hash_later) {
/* Position any partial block for next update/final/finup */
memcpy(req_ctx->buf, req_ctx->bufnext, req_ctx->to_hash_later);
+ req_ctx->nbuf = req_ctx->to_hash_later;
}
common_nonsnoop_hash_unmap(dev, edesc, areq);
@@ -1724,7 +1725,7 @@ static int ahash_init(struct ahash_request *areq)
struct talitos_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);
/* Initialize the context */
- req_ctx->count = 0;
+ req_ctx->nbuf = 0;
req_ctx->first = 1; /* first indicates h/w must init its context */
req_ctx->swinit = 0; /* assume h/w init of context */
req_ctx->hw_context_size =
@@ -1772,52 +1773,54 @@ static int ahash_process_req(struct ahash_request *areq, unsigned int nbytes)
crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
unsigned int nbytes_to_hash;
unsigned int to_hash_later;
- unsigned int index;
+ unsigned int nsg;
int chained;
- index = req_ctx->count & (blocksize - 1);
- req_ctx->count += nbytes;
-
- if (!req_ctx->last && (index + nbytes) < blocksize) {
- /* Buffer the partial block */
+ if (!req_ctx->last && (nbytes + req_ctx->nbuf <= blocksize)) {
+ /* Buffer up to one whole block */
sg_copy_to_buffer(areq->src,
sg_count(areq->src, nbytes, &chained),
- req_ctx->buf + index, nbytes);
+ req_ctx->buf + req_ctx->nbuf, nbytes);
+ req_ctx->nbuf += nbytes;
return 0;
}
- if (index) {
- /* partial block from previous update; chain it in. */
- sg_init_table(req_ctx->bufsl, (nbytes) ? 2 : 1);
- sg_set_buf(req_ctx->bufsl, req_ctx->buf, index);
- if (nbytes)
- scatterwalk_sg_chain(req_ctx->bufsl, 2,
- areq->src);
+ /* At least (blocksize + 1) bytes are available to hash */
+ nbytes_to_hash = nbytes + req_ctx->nbuf;
+ to_hash_later = nbytes_to_hash & (blocksize - 1);
+
+ if (req_ctx->last)
+ to_hash_later = 0;
+ else if (to_hash_later)
+ /* There is a partial block. Hash the full block(s) now */
+ nbytes_to_hash -= to_hash_later;
+ else {
+ /* Keep one block buffered */
+ nbytes_to_hash -= blocksize;
+ to_hash_later = blocksize;
+ }
+
+ /* Chain in any previously buffered data */
+ if (req_ctx->nbuf) {
+ nsg = (req_ctx->nbuf < nbytes_to_hash) ? 2 : 1;
+ sg_init_table(req_ctx->bufsl, nsg);
+ sg_set_buf(req_ctx->bufsl, req_ctx->buf, req_ctx->nbuf);
+ if (nsg > 1)
+ scatterwalk_sg_chain(req_ctx->bufsl, 2, areq->src);
req_ctx->psrc = req_ctx->bufsl;
- } else {
+ } else
req_ctx->psrc = areq->src;
+
+ if (to_hash_later) {
+ int nents = sg_count(areq->src, nbytes, &chained);
+ sg_copy_end_to_buffer(areq->src, nents,
+ req_ctx->bufnext,
+ to_hash_later,
+ nbytes - to_hash_later);
}
- nbytes_to_hash = index + nbytes;
- if (!req_ctx->last) {
- to_hash_later = (nbytes_to_hash & (blocksize - 1));
- if (to_hash_later) {
- int nents;
- /* Must copy to_hash_later bytes from the end
- * to bufnext (a partial block) for later.
- */
- nents = sg_count(areq->src, nbytes, &chained);
- sg_copy_end_to_buffer(areq->src, nents,
- req_ctx->bufnext,
- to_hash_later,
- nbytes - to_hash_later);
-
- /* Adjust count for what will be hashed now */
- nbytes_to_hash -= to_hash_later;
- }
- req_ctx->to_hash_later = to_hash_later;
- }
+ req_ctx->to_hash_later = to_hash_later;
- /* allocate extended descriptor */
+ /* Allocate extended descriptor */
edesc = ahash_edesc_alloc(areq, nbytes_to_hash);
if (IS_ERR(edesc))
return PTR_ERR(edesc);