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// SPDX-FileCopyrightText: 2016-2021 Leonardo Mörlein <git@irrelefant.net>
// SPDX-License-Identifier: MIT License
#include <libubox/md5.h>
#include <lua.h>
#include <lauxlib.h>
#include <lualib.h>
#include <stdlib.h>
#include <string.h>
#define MD5_DIGEST_LEN 16
#define MD5_STRLEN (2*MD5_DIGEST_LEN+1)
static int md5(lua_State *L) {
size_t len;
const char *input = lua_tolstring(L, 1, &len);
if (input == NULL) {
lua_pushstring(L, "first argument: should be the input string");
lua_error(L);
__builtin_unreachable();
}
unsigned char digest[MD5_DIGEST_LEN];
char output[MD5_STRLEN];
struct md5_ctx ctx;
md5_begin(&ctx);
md5_hash(input, len, &ctx);
md5_end(digest, &ctx);
// fill the digest bytewise in the output string
int i;
for (i = 0; i < MD5_DIGEST_LEN; i++) {
sprintf(output + 2*i, "%02x", digest[i]);
}
lua_pushstring(L, output);
return 1;
}
static const luaL_Reg R[] = {
{"md5", md5},
{NULL, NULL },
};
LUALIB_API int luaopen_hash(lua_State *L) {
luaL_register(L, "hash", R);
return 1;
}