New constant NETTLE_MAX_HASH_CONTEXT_SIZE.

* nettle-internal.h (NETTLE_MAX_HASH_CONTEXT_SIZE): New constant.
* testsuite/meta-hash-test.c (test_main): Add sanity check for
NETTLE_MAX_HASH_CONTEXT_SIZE.

ChangeLog

 2017-03-20  Niels Möller  <nisse@lysator.liu.se>
 
+	* nettle-internal.h (NETTLE_MAX_HASH_CONTEXT_SIZE): New constant.
+	* testsuite/meta-hash-test.c (test_main): Add sanity check for
+	NETTLE_MAX_HASH_CONTEXT_SIZE.
+
 	* tools/nettle-hash.c (list_algorithms): Also display the internal
 	context size.
 

nettle-internal.h

@@ -54,6 +54,7 @@
 /* Arbitrary limits which apply to systems that don't have alloca */
 #define NETTLE_MAX_HASH_BLOCK_SIZE 128
 #define NETTLE_MAX_HASH_DIGEST_SIZE 64
+#define NETTLE_MAX_HASH_CONTEXT_SIZE (sizeof(struct sha3_224_ctx))
 #define NETTLE_MAX_SEXP_ASSOC 17
 #define NETTLE_MAX_CIPHER_BLOCK_SIZE 32
 

testsuite/meta-hash-test.c

 #include "testutils.h"
 #include "nettle-internal.h"
 #include "nettle-meta.h"
+/* For NETTLE_MAX_HASH_CONTEXT_SIZE */
+#include "sha3.h"
 
 const char* hashes[] = {
   "md2",
@@ -34,7 +36,8 @@ test_main(void)
   while (NULL != nettle_hashes[j])
     j++;
   ASSERT(j == count); /* we are not missing testing any hashes */
-  for (j = 0; NULL != nettle_hashes[j]; j++)
+  for (j = 0; NULL != nettle_hashes[j]; j++) {
     ASSERT(nettle_hashes[j]->digest_size <= NETTLE_MAX_HASH_DIGEST_SIZE);
+    ASSERT(nettle_hashes[j]->context_size <= NETTLE_MAX_HASH_CONTEXT_SIZE);
+  }
 }
-