Added hash code

src/crypto/hash.c

@@ -0,0 +1,24 @@
+// Copyright (c) 2012-2013 The Cryptonote developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "hash-ops.h"
+#include "keccak.h"
+
+void hash_permutation(union hash_state *state) {
+  keccakf((uint64_t*)state, 24);
+}
+
+void hash_process(union hash_state *state, const uint8_t *buf, size_t count) {
+  keccak1600(buf, count, (uint8_t*)state);
+}
+
+void cn_fast_hash(const void *data, size_t length, char *hash) {
+  union hash_state state;
+  hash_process(&state, data, length);
+  memcpy(hash, &state, HASH_SIZE);
+}