/* Prosody IM v0.1

-- Copyright (C) 2008 Matthew Wild

-- Copyright (C) 2008 Waqas Hussain

-- 

-- This program is free software; you can redistribute it and/or

-- modify it under the terms of the GNU General Public License

-- as published by the Free Software Foundation; either version 2

-- of the License, or (at your option) any later version.

-- 

-- This program is distributed in the hope that it will be useful,

-- but WITHOUT ANY WARRANTY; without even the implied warranty of

-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

-- GNU General Public License for more details.

-- 

-- You should have received a copy of the GNU General Public License

-- along with this program; if not, write to the Free Software

-- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

*/

/*

* hashes.c

* Lua library for sha1, sha256 and md5 hashes

*/

#include <string.h>

#include "lua.h"

#include "lauxlib.h"

#include <openssl/sha.h>

#include <openssl/md5.h>

const char* hex_tab = "0123456789abcdef";

void toHex(const char* in, int length, char* out) {

	int i;

	for (i = 0; i < length; i++) {

		out[i*2] = hex_tab[(in[i] >> 4) & 0xF];

		out[i*2+1] = hex_tab[(in[i]) & 0xF];

	}

}

#define MAKE_HASH_FUNCTION(myFunc, func, size) \

static int myFunc(lua_State *L) { \

	size_t len; \

	const char *s = luaL_checklstring(L, 1, &len); \

	int hex_out = lua_toboolean(L, 2); \

	char hash[size]; \

	char result[size*2]; \

	func((const unsigned char*)s, len, (unsigned char*)hash);  \

	if (hex_out) { \

		toHex(hash, size, result); \

		lua_pushlstring(L, result, size*2); \

	} else { \

		lua_pushlstring(L, hash, size);\

	} \

	return 1; \

}

MAKE_HASH_FUNCTION(Lsha1, SHA1, 20)

MAKE_HASH_FUNCTION(Lsha256, SHA256, 32)

MAKE_HASH_FUNCTION(Lmd5, MD5, 16)

static const luaL_Reg Reg[] =

{

	{ "sha1",	Lsha1	},

	{ "sha256",	Lsha256	},

	{ "md5",	Lmd5	},

	{ NULL,		NULL	}

};

LUALIB_API int luaopen_util_hashes(lua_State *L)

{

	luaL_register(L, "hashes", Reg);

	lua_pushliteral(L, "version");			/** version */

	lua_pushliteral(L, "-3.14");

	lua_settable(L,-3);

	return 1;

}