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[CRYPTO] api: Handle unaligned keys in setkey

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setkey() in {cipher,blkcipher,ablkcipher,hash}.c does not respect the
requested alignment by the algorithm. This patch fixes it. The extra
memory is allocated by kmalloc() with GFP_ATOMIC flag.

Signed-off-by: Sebastian Siewior <linux-crypto@ml.breakpoint.cc>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Sebastian Siewior
2007-05-19 19:51:21 +10:00
committed by Herbert Xu
parent fe3c5206ad
commit ca7c39385c
4 changed files with 117 additions and 4 deletions
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38
crypto/hash.c
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@@ -22,6 +22,42 @@ static unsigned int crypto_hash_ctxsize(struct crypto_alg *alg, u32 type,
return alg->cra_ctxsize;
}
static int hash_setkey_unaligned(struct crypto_hash *crt, const u8 *key,
unsigned int keylen)
{
struct crypto_tfm *tfm = crypto_hash_tfm(crt);
struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
unsigned long alignmask = crypto_hash_alignmask(crt);
int ret;
u8 *buffer, *alignbuffer;
unsigned long absize;
absize = keylen + alignmask;
buffer = kmalloc(absize, GFP_ATOMIC);
if (!buffer)
return -ENOMEM;
alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
memcpy(alignbuffer, key, keylen);
ret = alg->setkey(crt, alignbuffer, keylen);
memset(alignbuffer, 0, absize);
kfree(buffer);
return ret;
}
static int hash_setkey(struct crypto_hash *crt, const u8 *key,
unsigned int keylen)
{
struct crypto_tfm *tfm = crypto_hash_tfm(crt);
struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
unsigned long alignmask = crypto_hash_alignmask(crt);
if ((unsigned long)key & alignmask)
return hash_setkey_unaligned(crt, key, keylen);
return alg->setkey(crt, key, keylen);
}
static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
{
struct hash_tfm *crt = &tfm->crt_hash;
@@ -34,7 +70,7 @@ static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
crt->update = alg->update;
crt->final = alg->final;
crt->digest = alg->digest;
crt->setkey = alg->setkey;
crt->setkey = hash_setkey;
crt->digestsize = alg->digestsize;
return 0;