New function nettle_get_hashes.

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-ciphers.c (_nettle_ciphers): Renamed array, from...
+	(nettle_ciphers: ... old name.
+	(nettle_get_ciphers): New function.
+
 2017-01-12  Niels Möller  <nisse@lysator.liu.se>
 
 	* tools/nettle-hash.c (find_algorithm): Deleted function.

nettle-meta-ciphers.c

@@ -36,7 +36,7 @@
 #include <stddef.h>
 #include "nettle-meta.h"
 
-const struct nettle_cipher * const nettle_ciphers[] = {
+const struct nettle_cipher * const _nettle_ciphers[] = {
   &nettle_aes128,
   &nettle_aes192,
   &nettle_aes256,
@@ -56,3 +56,9 @@ const struct nettle_cipher * const nettle_ciphers[] = {
   &nettle_arctwo_gutmann128,
   NULL
 };
+
+const struct nettle_cipher * const *
+nettle_get_ciphers (void)
+{
+  return _nettle_ciphers;
+}

nettle-meta.h

@@ -61,7 +61,15 @@ struct nettle_cipher
 };
 
 /* null-terminated list of ciphers implemented by this version of nettle */
-extern const struct nettle_cipher * const nettle_ciphers[];
+extern const struct nettle_cipher * const _nettle_ciphers[];
+
+const struct nettle_cipher * const *
+#ifdef __GNUC__
+__attribute__((pure))
+#endif
+nettle_get_ciphers (void);
+
+#define nettle_ciphers (nettle_get_ciphers())
 
 extern const struct nettle_cipher nettle_aes128;
 extern const struct nettle_cipher nettle_aes192;