diff --git a/src/flathash.cpp b/src/flathash.cpp
new file mode 100644
index 0000000..bc3d2df
--- /dev/null
+++ b/src/flathash.cpp
@@ -0,0 +1,114 @@
+/*
+ * Copyright 2015 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdio.h>
+#include <iostream>
+#include <sstream>
+#include <string>
+#include "flatbuffers/hash.h"
+
+enum OutputFormat { kDecimal, kHexadecimal, kHexadecimal0x };
+
+int main(int argc, char *argv[]) {
+  const char *name = argv[0];
+  if (argc <= 1) {
+    printf("%s HASH [OPTION]... [--] STRING...\n", name);
+    printf("Available hashing algorithms:\n");
+    printf("  16 bit:\n");
+    size_t size = sizeof(flatbuffers::kHashFunctions16) /
+                  sizeof(flatbuffers::kHashFunctions16[0]);
+    for (size_t i = 0; i < size; ++i) {
+      printf("    * %s\n", flatbuffers::kHashFunctions16[i].name);
+    }
+    printf("  32 bit:\n");
+    size = sizeof(flatbuffers::kHashFunctions32) /
+                  sizeof(flatbuffers::kHashFunctions32[0]);
+    for (size_t i = 0; i < size; ++i) {
+      printf("    * %s\n", flatbuffers::kHashFunctions32[i].name);
+    }
+    printf("  64 bit:\n");
+    size = sizeof(flatbuffers::kHashFunctions64) /
+           sizeof(flatbuffers::kHashFunctions64[0]);
+    for (size_t i = 0; i < size; ++i) {
+      printf("    * %s\n", flatbuffers::kHashFunctions64[i].name);
+    }
+    printf(
+        "  -d         Output hash in decimal.\n"
+        "  -x         Output hash in hexadecimal.\n"
+        "  -0x        Output hash in hexadecimal and prefix with 0x.\n"
+        "  -c         Append the string to the output in a c-style comment.\n");
+    return 1;
+  }
+
+  const char *hash_algorithm = argv[1];
+
+  flatbuffers::NamedHashFunction<uint16_t>::HashFunction hash_function16 =
+      flatbuffers::FindHashFunction16(hash_algorithm);
+  flatbuffers::NamedHashFunction<uint32_t>::HashFunction hash_function32 =
+      flatbuffers::FindHashFunction32(hash_algorithm);
+  flatbuffers::NamedHashFunction<uint64_t>::HashFunction hash_function64 =
+      flatbuffers::FindHashFunction64(hash_algorithm);
+
+  if (!hash_function16 && !hash_function32 && !hash_function64) {
+    printf("\"%s\" is not a known hash algorithm.\n", hash_algorithm);
+    return 1;
+  }
+
+  OutputFormat output_format = kHexadecimal;
+  bool annotate = false;
+  bool escape_dash = false;
+  for (int i = 2; i < argc; i++) {
+    const char *arg = argv[i];
+    if (!escape_dash && arg[0] == '-') {
+      std::string opt = arg;
+      if (opt == "-d")
+        output_format = kDecimal;
+      else if (opt == "-x")
+        output_format = kHexadecimal;
+      else if (opt == "-0x")
+        output_format = kHexadecimal0x;
+      else if (opt == "-c")
+        annotate = true;
+      else if (opt == "--")
+        escape_dash = true;
+      else
+        printf("Unrecognized argument: \"%s\"\n", arg);
+    } else {
+      std::stringstream ss;
+      if (output_format == kDecimal) {
+        ss << std::dec;
+      } else if (output_format == kHexadecimal) {
+        ss << std::hex;
+      } else if (output_format == kHexadecimal0x) {
+        ss << std::hex;
+        ss << "0x";
+      }
+      if (hash_function16)
+        ss << hash_function16(arg);
+      else if (hash_function32)
+        ss << hash_function32(arg);
+      else if (hash_function64)
+        ss << hash_function64(arg);
+
+      if (annotate) ss << " /* \"" << arg << "\" */";
+
+      ss << "\n";
+
+      std::cout << ss.str();
+    }
+  }
+  return 0;
+}