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crypto: talitos - fix ahash for multiple of blocksize

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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>
This commit is contained in:
Lee Nipper 2010-06-16 15:29:15 +10:00 committed by Herbert Xu
parent 5b04fc1703
commit 5e833bc416
1 changed files with 39 additions and 36 deletions
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75
drivers/crypto/talitos.c
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@ -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;
}
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;
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);
}
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);