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[CRYPTO] digest: Add alignment handling

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Some hash modules load/store data words directly.  The digest layer
should pass properly aligned buffer to update()/final() method.  This
patch also add cra_alignmask to some hash modules.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Atsushi Nemoto
2006-04-10 08:42:35 +10:00
committed by Herbert Xu
parent d00e708cef
commit e1147d8f47
6 changed files with 35 additions and 15 deletions
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42
crypto/digest.c
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@@ -27,6 +27,7 @@ static void update(struct crypto_tfm *tfm,
struct scatterlist *sg, unsigned int nsg)
{
unsigned int i;
unsigned int alignmask = crypto_tfm_alg_alignmask(tfm);
for (i = 0; i < nsg; i++) {
@@ -38,12 +39,24 @@ static void update(struct crypto_tfm *tfm,
unsigned int bytes_from_page = min(l, ((unsigned int)
(PAGE_SIZE)) -
offset);
char *p = crypto_kmap(pg, 0) + offset;
char *src = crypto_kmap(pg, 0);
char *p = src + offset;
if (unlikely(offset & alignmask)) {
unsigned int bytes =
alignmask + 1 - (offset & alignmask);
bytes = min(bytes, bytes_from_page);
tfm->__crt_alg->cra_digest.dia_update
(crypto_tfm_ctx(tfm), p,
bytes);
p += bytes;
bytes_from_page -= bytes;
l -= bytes;
}
tfm->__crt_alg->cra_digest.dia_update
(crypto_tfm_ctx(tfm), p,
bytes_from_page);
crypto_kunmap(p, 0);
crypto_kunmap(src, 0);
crypto_yield(tfm);
offset = 0;
pg++;
@@ -54,7 +67,15 @@ static void update(struct crypto_tfm *tfm,
static void final(struct crypto_tfm *tfm, u8 *out)
{
tfm->__crt_alg->cra_digest.dia_final(crypto_tfm_ctx(tfm), out);
unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
if (unlikely((unsigned long)out & alignmask)) {
unsigned int size = crypto_tfm_alg_digestsize(tfm);
u8 buffer[size + alignmask];
u8 *dst = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
tfm->__crt_alg->cra_digest.dia_final(crypto_tfm_ctx(tfm), dst);
memcpy(out, dst, size);
} else
tfm->__crt_alg->cra_digest.dia_final(crypto_tfm_ctx(tfm), out);
}
static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
@@ -69,18 +90,9 @@ static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
static void digest(struct crypto_tfm *tfm,
struct scatterlist *sg, unsigned int nsg, u8 *out)
{
unsigned int i;
tfm->crt_digest.dit_init(tfm);
for (i = 0; i < nsg; i++) {
char *p = crypto_kmap(sg[i].page, 0) + sg[i].offset;
tfm->__crt_alg->cra_digest.dia_update(crypto_tfm_ctx(tfm),
p, sg[i].length);
crypto_kunmap(p, 0);
crypto_yield(tfm);
}
crypto_digest_final(tfm, out);
init(tfm);
update(tfm, sg, nsg);
final(tfm, out);
}
int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags)