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/*
* 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(s, len, 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_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;
}
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