crypto: api - Export crypto_alg_lookup instead of __crypto_alg_lookup
[linux-2.6.git] / crypto / hmac.c
index 14c6351..7ff2d6a 100644 (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;