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crypto: hash - Fixed digest size check

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The digest size check on hash algorithms is incorrect.  It's
perfectly valid for hash algorithms to have a digest length
longer than their block size.  For example crc32c has a block
size of 1 and a digest size of 4.  Rather than having it lie
about its block size, this patch fixes the checks to do what
they really should which is to bound the digest size so that
code placing the digest on the stack continue to work.

HMAC however still needs to check this as it's only defined
for such algorithms.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2008-07-07 20:23:56 +08:00
parent caee16883a
commit ca786dc738
4 changed files with 13 additions and 9 deletions
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2
crypto/ahash.c
View file

@ -68,7 +68,7 @@ static int crypto_init_ahash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
struct ahash_alg *alg = &tfm->__crt_alg->cra_ahash;
struct ahash_tfm *crt = &tfm->crt_ahash;
if (alg->digestsize > crypto_tfm_alg_blocksize(tfm))
if (alg->digestsize > PAGE_SIZE / 8)
return -EINVAL;
crt->init = alg->init;

2
crypto/digest.c
View file

@ -141,7 +141,7 @@ int crypto_init_digest_ops(struct crypto_tfm *tfm)
struct hash_tfm *ops = &tfm->crt_hash;
struct digest_alg *dalg = &tfm->__crt_alg->cra_digest;
if (dalg->dia_digestsize > crypto_tfm_alg_blocksize(tfm))
if (dalg->dia_digestsize > PAGE_SIZE / 8)
return -EINVAL;
ops->init = init;

2
crypto/hash.c
View file

@ -152,7 +152,7 @@ static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
{
struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
if (alg->digestsize > crypto_tfm_alg_blocksize(tfm))
if (alg->digestsize > PAGE_SIZE / 8)
return -EINVAL;
if ((mask & CRYPTO_ALG_TYPE_HASH_MASK) != CRYPTO_ALG_TYPE_HASH_MASK)

16
crypto/hmac.c
View file

@ -226,6 +226,7 @@ static struct crypto_instance *hmac_alloc(struct rtattr **tb)
struct crypto_instance *inst;
struct crypto_alg *alg;
int err;
int ds;
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_HASH);
if (err)
@ -236,6 +237,13 @@ static struct crypto_instance *hmac_alloc(struct rtattr **tb)
if (IS_ERR(alg))
return ERR_CAST(alg);
inst = ERR_PTR(-EINVAL);
ds = (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
CRYPTO_ALG_TYPE_HASH ? alg->cra_hash.digestsize :
alg->cra_digest.dia_digestsize;
if (ds > alg->cra_blocksize)
goto out_put_alg;
inst = crypto_alloc_instance("hmac", alg);
if (IS_ERR(inst))
goto out_put_alg;
@ -246,14 +254,10 @@ static struct crypto_instance *hmac_alloc(struct rtattr **tb)
inst->alg.cra_alignmask = alg->cra_alignmask;
inst->alg.cra_type = &crypto_hash_type;
inst->alg.cra_hash.digestsize =
(alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
CRYPTO_ALG_TYPE_HASH ? alg->cra_hash.digestsize :
alg->cra_digest.dia_digestsize;
inst->alg.cra_hash.digestsize = ds;
inst->alg.cra_ctxsize = sizeof(struct hmac_ctx) +
ALIGN(inst->alg.cra_blocksize * 2 +
inst->alg.cra_hash.digestsize,
ALIGN(inst->alg.cra_blocksize * 2 + ds,
sizeof(void *));
inst->alg.cra_init = hmac_init_tfm;