2 files changed, 34 insertions, 0 deletions

diff --git a/src/script/lua_api/l_util.cpp b/src/script/lua_api/l_util.cpp
index c4a988e07..901105fe0 100644
--- a/src/script/lua_api/l_util.cpp
+++ b/src/script/lua_api/l_util.cpp
@@ -36,6 +36,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "util/base64.h"
 #include "config.h"
 #include "version.h"
+#include "util/hex.h"
+#include "util/sha1.h"
 #include <algorithm>
 
 
@@ -422,6 +424,32 @@ int ModApiUtil::l_get_version(lua_State *L)
 	return 1;
 }
 
+int ModApiUtil::l_sha1(lua_State *L)
+{
+	NO_MAP_LOCK_REQUIRED;
+	size_t size;
+	const char *data = luaL_checklstring(L, 1, &size);
+	bool hex = !lua_isboolean(L, 2) || !lua_toboolean(L, 2);
+
+	// Compute actual checksum of data
+	std::string data_sha1;
+	{
+		SHA1 ctx;
+		ctx.addBytes(data, size);
+		unsigned char *data_tmpdigest = ctx.getDigest();
+		data_sha1.assign((char*) data_tmpdigest, 20);
+		free(data_tmpdigest);
+	}
+
+	if (hex) {
+		std::string sha1_hex = hex_encode(data_sha1);
+		lua_pushstring(L, sha1_hex.c_str());
+	} else {
+		lua_pushlstring(L, data_sha1.data(), data_sha1.size());
+	}
+
+	return 1;
+}
 
 void ModApiUtil::Initialize(lua_State *L, int top)
 {
@@ -454,6 +482,7 @@ void ModApiUtil::Initialize(lua_State *L, int top)
 	API_FCT(decode_base64);
 
 	API_FCT(get_version);
+	API_FCT(sha1);
 
 	LuaSettings::create(L, g_settings, g_settings_path);
 	lua_setfield(L, top, "settings");
@@ -479,6 +508,7 @@ void ModApiUtil::InitializeClient(lua_State *L, int top)
 	API_FCT(decode_base64);
 
 	API_FCT(get_version);
+	API_FCT(sha1);
 }
 
 void ModApiUtil::InitializeAsync(lua_State *L, int top)
@@ -504,6 +534,7 @@ void ModApiUtil::InitializeAsync(lua_State *L, int top)
 	API_FCT(decode_base64);
 
 	API_FCT(get_version);
+	API_FCT(sha1);
 
 	LuaSettings::create(L, g_settings, g_settings_path);
 	lua_setfield(L, top, "settings");
diff --git a/src/script/lua_api/l_util.h b/src/script/lua_api/l_util.h
index b75d9db29..16f4edea8 100644
--- a/src/script/lua_api/l_util.h
+++ b/src/script/lua_api/l_util.h
@@ -93,6 +93,9 @@ private:
 	// get_version()
 	static int l_get_version(lua_State *L);
 
+	// sha1(string, raw)
+	static int l_sha1(lua_State *L);
+
 public:
 	static void Initialize(lua_State *L, int top);
 	static void InitializeAsync(lua_State *L, int top);