hash: fix hash_permutation on big endian

src/crypto/hash.c

@@ -36,7 +36,14 @@
 #include "keccak.h"
 
 void hash_permutation(union hash_state *state) {
+#if BYTE_ORDER == LITTLE_ENDIAN
   keccakf((uint64_t*)state, 24);
+#else
+  uint64_t le_state[25];
+  memcpy_swap64le(le_state, state, 25);
+  keccakf(le_state, 24);
+  memcpy_swap64le(state, le_state, 25);
+#endif
 }
 
 void hash_process(union hash_state *state, const uint8_t *buf, size_t count) {