New function nettle_get_aeads.

ChangeLog

 2017-04-09  Niels Möller  <nisse@lysator.liu.se>
 
-	* nettle-meta.h (nettle_ciphers): New macro, analogous to below
-	change to nettle_hashes.
+	* nettle-meta.h (nettle_ciphers, nettle_aeads): New macros,
+	analogous to below change to nettle_hashes.
 
 	* nettle-meta-ciphers.c (_nettle_ciphers): Renamed array, from...
 	(nettle_ciphers: ... old name.
 	(nettle_get_ciphers): New function.
 
+	* nettle-meta-aeads.c (_nettle_aeads): Renamed array, from...
+	(nettle_aeads: ... old name.
+	(nettle_get_aeads): New function.
+
 2017-01-12  Niels Möller  <nisse@lysator.liu.se>
 
 	* tools/nettle-hash.c (find_algorithm): Deleted function.

nettle-meta-aeads.c

@@ -37,7 +37,7 @@
 
 #include "nettle-meta.h"
 
-const struct nettle_aead * const nettle_aeads[] = {
+const struct nettle_aead * const _nettle_aeads[] = {
   &nettle_gcm_aes128,
   &nettle_gcm_aes192,
   &nettle_gcm_aes256,
@@ -47,3 +47,9 @@ const struct nettle_aead * const nettle_aeads[] = {
   &nettle_chacha_poly1305,
   NULL
 };
+
+const struct nettle_aead * const *
+nettle_get_aeads (void)
+{
+  return _nettle_aeads;
+}

nettle-meta.h

@@ -176,7 +176,15 @@ struct nettle_aead
 
 /* null-terminated list of aead constructions implemented by this
    version of nettle */
-extern const struct nettle_aead * const nettle_aeads[];
+extern const struct nettle_aead * const _nettle_aeads[];
+
+const struct nettle_aead * const *
+#ifdef __GNUC__
+__attribute__((pure))
+#endif
+nettle_get_aeads (void);
+
+#define nettle_aeads (nettle_get_aeads())
 
 extern const struct nettle_aead nettle_gcm_aes128;
 extern const struct nettle_aead nettle_gcm_aes192;