diff --git a/ChangeLog b/ChangeLog
index 3d8ba00e4..8349cb7bd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2013-11-12  Vladimir Serbinenko  <phcoder@gmail.com>
+
+	* grub-core/io/lzopio.c: Remove variable length arrays.
+
 2013-11-12  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	* include/grub/crypto.h: Add maximums on hash size and cipher block
diff --git a/grub-core/io/lzopio.c b/grub-core/io/lzopio.c
index 0e7e2e56b..2895e2102 100644
--- a/grub-core/io/lzopio.c
+++ b/grub-core/io/lzopio.c
@@ -166,15 +166,17 @@ read_block_data (struct grub_lzopio *lzopio)
 
   if (lzopio->ccheck_fun)
     {
-      GRUB_PROPERLY_ALIGNED_ARRAY (context, lzopio->ccheck_fun->contextsize);
+      grub_uint8_t computed_hash[GRUB_CRYPTO_MAX_MDLEN];
 
-      lzopio->ccheck_fun->init (context);
-      lzopio->ccheck_fun->write (context, lzopio->block.cdata,
-				 lzopio->block.csize);
-      lzopio->ccheck_fun->final (context);
+      if (lzopio->ccheck_fun->mdlen > GRUB_CRYPTO_MAX_MDLEN)
+	return -1;
+
+      grub_crypto_hash (lzopio->ccheck_fun, computed_hash,
+			lzopio->block.cdata,
+			lzopio->block.csize);
 
       if (grub_memcmp
-	  (lzopio->ccheck_fun->read (context), &lzopio->block.ccheck,
+	  (computed_hash, &lzopio->block.ccheck,
 	   sizeof (lzopio->block.ccheck)) != 0)
 	return -1;
     }
@@ -212,15 +214,17 @@ uncompress_block (struct grub_lzopio *lzopio)
 
       if (lzopio->ucheck_fun)
 	{
-	  GRUB_PROPERLY_ALIGNED_ARRAY (context, lzopio->ucheck_fun->contextsize);
+	  grub_uint8_t computed_hash[GRUB_CRYPTO_MAX_MDLEN];
 
-	  lzopio->ucheck_fun->init (context);
-	  lzopio->ucheck_fun->write (context, lzopio->block.udata,
-				     lzopio->block.usize);
-	  lzopio->ucheck_fun->final (context);
+	  if (lzopio->ucheck_fun->mdlen > GRUB_CRYPTO_MAX_MDLEN)
+	    return -1;
+
+	  grub_crypto_hash (lzopio->ucheck_fun, computed_hash,
+			    lzopio->block.udata,
+			    lzopio->block.usize);
 
 	  if (grub_memcmp
-	      (lzopio->ucheck_fun->read (context), &lzopio->block.ucheck,
+	      (computed_hash, &lzopio->block.ucheck,
 	       sizeof (lzopio->block.ucheck)) != 0)
 	    return -1;
 	}