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lcrypt_hashes.c
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/**
*
* Copyright (c) 2011-2015 David Eder, InterTECH
* Copyright (c) 2015 Simbiose
*
* License: https://www.gnu.org/licenses/lgpl-2.1.html LGPL version 2.1
*
*/
#define HASH_MODE_NONE 0
#define HASH_MODE_HASH 1
#define HASH_MODE_HMAC 2
#define HASH_MODE_OMAC 3
#define HASH_MODE_MAX 3
static int lcrypt_max_hashes = 0;
typedef struct {
int mode;
union {
struct {
int hash;
hash_state state;
} hash;
hmac_state hmac;
omac_state omac;
} data;
} lcrypt_hash_t;
static int _lcrypt_hash_add (lua_State *L, lcrypt_hash_t *h) {
size_t in_length = 0;
const unsigned char *in = (const unsigned char*)luaL_optlstring(L, 2, "", &in_length);
switch (h->mode) {
case HASH_MODE_HASH: (void)lcrypt_check(L, hash_descriptor[h->data.hash.hash].process(&h->data.hash.state, in, (unsigned long)in_length)); break;
case HASH_MODE_HMAC: (void)lcrypt_check(L, hmac_process(&h->data.hmac, in, (unsigned long)in_length)); break;
case HASH_MODE_OMAC: (void)lcrypt_check(L, omac_process(&h->data.omac, in, (unsigned long)in_length)); break;
default: RETURN_STRING_ERROR(L, "Unknown mode");
}
return 0;
}
static int lcrypt_hash_add (lua_State *L) {
lcrypt_hash_t *h = luaL_checkudata(L, 1, "LCRYPT_HASH");
return _lcrypt_hash_add(L, h);
}
static int lcrypt_hash_done (lua_State *L) {
lcrypt_hash_t *h = luaL_checkudata(L, 1, "LCRYPT_HASH");
(void)_lcrypt_hash_add(L, h);
switch (h->mode) {
case HASH_MODE_HASH: {
unsigned char out[hash_descriptor[h->data.hash.hash].hashsize];
memset(out, 0, (size_t)hash_descriptor[h->data.hash.hash].hashsize);
(void)lcrypt_check(L, hash_descriptor[h->data.hash.hash].done(&h->data.hash.state, out));
lua_pushlstring(L, (char*)out, (size_t)hash_descriptor[h->data.hash.hash].hashsize);
} break;
case HASH_MODE_HMAC: {
unsigned long out_length = hash_descriptor[h->data.hmac.hash].hashsize;
unsigned char out[out_length];
memset(out, 0, (size_t)out_length);
(void)lcrypt_check(L, hmac_done(&h->data.hmac, out, &out_length));
lua_pushlstring(L, (char*)out, (size_t)out_length);
} break;
case HASH_MODE_OMAC: {
unsigned long out_length = (unsigned long)cipher_descriptor[h->data.omac.cipher_idx].block_length;
unsigned char out[out_length];
memset(out, 0, (size_t)out_length);
(void)lcrypt_check(L, omac_done(&h->data.omac, out, &out_length));
lua_pushlstring(L, (char*)out, (size_t)out_length);
} break;
default:
RETURN_STRING_ERROR(L, "Unknown mode");
}
memset(h, 0, sizeof(lcrypt_hash_t));
return 1;
}
static int lcrypt_hash_gc (lua_State *L) {
lcrypt_hash_t *h = luaL_checkudata(L, 1, "LCRYPT_HASH");
switch (h->mode) {
case HASH_MODE_HASH: {
unsigned char out[hash_descriptor[h->data.hash.hash].hashsize];
memset(out, 0, (size_t)hash_descriptor[h->data.hash.hash].hashsize);
(void)lcrypt_check(L, hash_descriptor[h->data.hash.hash].done(&h->data.hash.state, out));
} break;
case HASH_MODE_HMAC: {
unsigned long out_length = hash_descriptor[h->data.hmac.hash].hashsize;
unsigned char out[out_length];
memset(out, 0, (size_t)out_length);
(void)lcrypt_check(L, hmac_done(&h->data.hmac, out, &out_length));
} break;
case HASH_MODE_OMAC: {
unsigned long out_length = (unsigned long)cipher_descriptor[h->data.omac.cipher_idx].block_length;
unsigned char out[out_length];
memset(out, 0, (size_t)out_length);
(void)lcrypt_check(L, omac_done(&h->data.omac, out, &out_length));
} break;
}
return 0;
}
static int lcrypt_hash (lua_State *L) {
int hash = -1, mode = HASH_MODE_NONE;
/* get hash */
if(lua_isnumber(L, 1) == 1) {
hash = luaL_checkint(L, 1);
} else {
const char *h = luaL_checkstring(L, 1);
hash = find_hash(h);
if(hash < 0) hash = find_cipher(h);
}
if (hash < 0 || hash > lcrypt_max_hashes) RETURN_STRING_ERROR(L, "Unknown hash");
/* get mode */
if (lua_isnumber(L, 2) == 1) {
mode = luaL_checkint(L, 2);
} else {
const char *m = luaL_checkstring(L, 2);
if (strcmp(m, "hash") == 0)
mode = HASH_MODE_HASH;
else if (strcmp(m, "hmac") == 0)
mode = HASH_MODE_HMAC;
else if (strcmp(m, "omac") == 0)
mode = HASH_MODE_OMAC;
}
if (mode <= 0 || mode > HASH_MODE_MAX) RETURN_STRING_ERROR(L, "Unknown mode");
{
/* get optional first data chunk */
size_t in_length = 0, extra_length = 0;
const unsigned char *in = (const unsigned char*)luaL_optlstring(L, 3, "", &in_length);
const unsigned char *extra = (const unsigned char*)luaL_optlstring(L, 4, "", &extra_length);
/* prepare result */
lcrypt_hash_t *h = lua_newuserdata(L, sizeof(lcrypt_hash_t));
luaL_getmetatable(L, "LCRYPT_HASH");
(void)lua_setmetatable(L, -2);
memset(h, 0, sizeof(lcrypt_hash_t));
switch (mode) {
case HASH_MODE_HASH: {
h->data.hash.hash = hash;
(void)lcrypt_check(L, hash_descriptor[hash].init(&h->data.hash.state));
h->mode = mode;
(void)lcrypt_check(L, hash_descriptor[hash].process(&h->data.hash.state, in, (unsigned long)in_length));
} break;
case HASH_MODE_HMAC: {
(void)lcrypt_check(L, hmac_init(&h->data.hmac, hash, extra, (unsigned long)extra_length));
h->mode = mode;
(void)lcrypt_check(L, hmac_process(&h->data.hmac, in, (unsigned long)in_length));
} break;
case HASH_MODE_OMAC: {
(void)lcrypt_check(L, omac_init(&h->data.omac, hash, extra, (unsigned long)extra_length));
h->mode = mode;
(void)lcrypt_check(L, omac_process(&h->data.omac, in, (unsigned long)in_length));
} break;
default:
RETURN_STRING_ERROR(L, "Unknown mode");
}
}
return 1;
}
static int lcrypt_hash_size (lua_State *L) {
lcrypt_hash_t *h = luaL_checkudata(L, 1, "LCRYPT_HASH");
switch (h->mode) {
case HASH_MODE_HASH: lua_pushinteger(L, (lua_Integer)hash_descriptor[h->data.hash.hash].hashsize); return 1;
case HASH_MODE_HMAC: lua_pushinteger(L, (lua_Integer)hash_descriptor[h->data.hmac.hash].hashsize); return 1;
case HASH_MODE_OMAC: lua_pushinteger(L, (lua_Integer)cipher_descriptor[h->data.omac.cipher_idx].block_length); return 1;
}
return 0;
}
static int lcrypt_hash_index (lua_State *L) {
lcrypt_hash_t *h = luaL_checkudata(L, 1, "LCRYPT_HASH");
const char *index = luaL_checkstring(L, 2);
int hash_index = -1, cipher_index = -1;
if (strcmp(index, "add") == 0) { lua_pushcfunction(L, lcrypt_hash_add); return 1; }
if (strcmp(index, "done") == 0) { lua_pushcfunction(L, lcrypt_hash_done); return 1; }
if (strcmp(index, "mode") == 0) {
switch (h->mode) {
case HASH_MODE_HASH: lua_pushstring(L, "hash"); return 1;
case HASH_MODE_HMAC: lua_pushstring(L, "hmac"); return 1;
case HASH_MODE_OMAC: lua_pushstring(L, "omac"); return 1;
}
return 0;
}
switch (h->mode) {
case HASH_MODE_HASH: hash_index = h->data.hash.hash; break;
case HASH_MODE_HMAC: hash_index = h->data.hmac.hash; break;
}
if (hash_index >= 0) {
if (strcmp(index, "hash") == 0) { lua_pushstring(L, hash_descriptor[hash_index].name); return 1; }
if (strcmp(index, "size") == 0) { lua_pushinteger(L, (lua_Integer)hash_descriptor[hash_index].hashsize); return 1; }
}
if (h->mode == HASH_MODE_OMAC) cipher_index = h->data.omac.cipher_idx;
if (cipher_index >= 0) {
if(strcmp(index, "cipher") == 0) { lua_pushstring(L, cipher_descriptor[cipher_index].name); return 1; }
if(strcmp(index, "size") == 0) { lua_pushinteger(L, (lua_Integer)cipher_descriptor[cipher_index].block_length); return 1; }
}
return 0;
}
static const struct luaL_Reg lcrypt_hash_flib[] = {
{"__index", &lcrypt_hash_index},
{"__gc", &lcrypt_hash_gc},
{"__len", &lcrypt_hash_size},
{NULL, NULL}
};
static void lcrypt_start_hashes(lua_State *L) {
ADD_FUNCTION(L, hash);
lua_pushstring(L, "hashes");
lua_newtable(L);
#define ADD_HASH(L,name) \
{ \
int h = register_hash(&name ## _desc); \
if(h > lcrypt_max_hashes) lcrypt_max_hashes = h; \
lua_pushstring(L, #name); \
lua_pushinteger(L, (lua_Integer)h); \
lua_settable(L, -3); \
}
ADD_HASH(L, whirlpool); ADD_HASH(L, sha512); ADD_HASH(L, sha384); ADD_HASH(L, rmd320);
ADD_HASH(L, sha256); ADD_HASH(L, rmd256); ADD_HASH(L, sha224); ADD_HASH(L, tiger);
ADD_HASH(L, sha1); ADD_HASH(L, rmd160); ADD_HASH(L, rmd128); ADD_HASH(L, md5);
ADD_HASH(L, md4); ADD_HASH(L, md2);
#undef ADD_HASH
lua_settable(L, -3);
lua_pushstring(L, "hash_modes");
lua_newtable(L);
#define ADD_MODE(L,name,value) \
{ \
lua_pushstring(L, #name); \
lua_pushinteger(L, value); \
lua_settable(L, -3); \
}
ADD_MODE(L, hash, HASH_MODE_HASH); ADD_MODE(L, hmac, HASH_MODE_HMAC); ADD_MODE(L, hmac, HASH_MODE_HMAC);
#undef ADD_MODE
lua_settable(L, -3);
(void)luaL_newmetatable(L, "LCRYPT_HASH");
(void)luaL_register(L, NULL, lcrypt_hash_flib);
lua_pop(L, 1);
}