[CRYPTO] api: Handle unaligned keys in setkey
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>
diff --git a/crypto/hash.c b/crypto/hash.c
index 4ccd22d..4d75ca7 100644
--- a/crypto/hash.c
+++ b/crypto/hash.c
@@ -22,6 +22,42 @@
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 @@
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;