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- // Module for cryptography
- #include <c_errno.h>
- #include "module.h"
- #include "lauxlib.h"
- #include "platform.h"
- #include "c_types.h"
- #include "c_stdlib.h"
- #include "vfs.h"
- #include "../crypto/digests.h"
- #include "../crypto/mech.h"
- #include "lmem.h"
- #include "user_interface.h"
- #include "rom.h"
- typedef struct {
- const digest_mech_info_t *mech_info;
- void *ctx;
- uint8_t *k_opad;
- } digest_user_datum_t;
- /**
- * hash = crypto.sha1(input)
- *
- * Calculates raw SHA1 hash of input string.
- * Input is arbitrary string, output is raw 20-byte hash as string.
- */
- static int crypto_sha1( lua_State* L )
- {
- SHA1_CTX ctx;
- uint8_t digest[20];
- // Read the string from lua (with length)
- int len;
- const char* msg = luaL_checklstring(L, 1, &len);
- // Use the SHA* functions in the rom
- SHA1Init(&ctx);
- SHA1Update(&ctx, msg, len);
- SHA1Final(digest, &ctx);
- // Push the result as a lua string
- lua_pushlstring(L, digest, 20);
- return 1;
- }
- #ifdef LUA_USE_MODULES_ENCODER
- static int call_encoder( lua_State* L, const char *function ) {
- if (lua_gettop(L) != 1) {
- luaL_error(L, "%s must have one argument", function);
- }
- lua_getfield(L, LUA_GLOBALSINDEX, "encoder");
- if (!lua_istable(L, -1) && !lua_isrotable(L, -1)) { // also need table just in case encoder has been overloaded
- luaL_error(L, "Cannot find encoder.%s", function);
- }
- lua_getfield(L, -1, function);
- lua_insert(L, 1); //move function below the argument
- lua_pop(L, 1); //and dump the encoder rotable from stack.
- lua_call(L,1,1); // call encoder.xxx(string)
- return 1;
- }
- static int crypto_base64_encode (lua_State* L) {
- return call_encoder(L, "toBase64");
- }
- static int crypto_hex_encode (lua_State* L) {
- return call_encoder(L, "toHex");
- }
- #else
- static const char* bytes64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
- /**
- * encoded = crypto.toBase64(raw)
- *
- * Encodes raw binary string as base64 string.
- */
- static int crypto_base64_encode( lua_State* L )
- {
- int len;
- const char* msg = luaL_checklstring(L, 1, &len);
- int blen = (len + 2) / 3 * 4;
- char* out = (char*)c_malloc(blen);
- int j = 0, i;
- for (i = 0; i < len; i += 3) {
- int a = msg[i];
- int b = (i + 1 < len) ? msg[i + 1] : 0;
- int c = (i + 2 < len) ? msg[i + 2] : 0;
- out[j++] = bytes64[a >> 2];
- out[j++] = bytes64[((a & 3) << 4) | (b >> 4)];
- out[j++] = (i + 1 < len) ? bytes64[((b & 15) << 2) | (c >> 6)] : 61;
- out[j++] = (i + 2 < len) ? bytes64[(c & 63)] : 61;
- }
- lua_pushlstring(L, out, j);
- c_free(out);
- return 1;
- }
- /**
- * encoded = crypto.toHex(raw)
- *
- * Encodes raw binary string as hex string.
- */
- static int crypto_hex_encode( lua_State* L)
- {
- int len;
- const char* msg = luaL_checklstring(L, 1, &len);
- char* out = (char*)c_malloc(len * 2);
- int i, j = 0;
- for (i = 0; i < len; i++) {
- out[j++] = crypto_hexbytes[msg[i] >> 4];
- out[j++] = crypto_hexbytes[msg[i] & 0xf];
- }
- lua_pushlstring(L, out, len*2);
- c_free(out);
- return 1;
- }
- #endif
- /**
- * masked = crypto.mask(message, mask)
- *
- * Apply a mask (repeated if shorter than message) as XOR to each byte.
- */
- static int crypto_mask( lua_State* L )
- {
- int len, mask_len;
- const char* msg = luaL_checklstring(L, 1, &len);
- const char* mask = luaL_checklstring(L, 2, &mask_len);
- if(mask_len <= 0)
- return luaL_error(L, "invalid argument: mask");
- int i;
- char* copy = (char*)c_malloc(len);
- for (i = 0; i < len; i++) {
- copy[i] = msg[i] ^ mask[i % mask_len];
- }
- lua_pushlstring(L, copy, len);
- c_free(copy);
- return 1;
- }
- static inline int bad_mech (lua_State *L) { return luaL_error (L, "unknown hash mech"); }
- static inline int bad_mem (lua_State *L) { return luaL_error (L, "insufficient memory"); }
- static inline int bad_file (lua_State *L) { return luaL_error (L, "file does not exist"); }
- /* rawdigest = crypto.hash("MD5", str)
- * strdigest = crypto.toHex(rawdigest)
- */
- static int crypto_lhash (lua_State *L)
- {
- const digest_mech_info_t *mi = crypto_digest_mech (luaL_checkstring (L, 1));
- if (!mi)
- return bad_mech (L);
- size_t len = 0;
- const char *data = luaL_checklstring (L, 2, &len);
- uint8_t digest[mi->digest_size];
- if (crypto_hash (mi, data, len, digest) != 0)
- return bad_mem (L);
- lua_pushlstring (L, digest, sizeof (digest));
- return 1;
- }
- /* General Usage for extensible hash functions:
- * sha = crypto.new_hash("MD5")
- * sha.update("Data")
- * sha.update("Data2")
- * strdigest = crypto.toHex(sha.finalize())
- */
- #define WANT_HASH 0
- #define WANT_HMAC 1
- static int crypto_new_hash_hmac (lua_State *L, int what)
- {
- const digest_mech_info_t *mi = crypto_digest_mech (luaL_checkstring (L, 1));
- if (!mi)
- return bad_mech (L);
- size_t len = 0;
- const char *key = 0;
- uint8_t *k_opad = 0;
- if (what == WANT_HMAC)
- {
- key = luaL_checklstring (L, 2, &len);
- k_opad = luaM_malloc (L, mi->block_size);
- }
- void *ctx = luaM_malloc (L, mi->ctx_size);
- mi->create (ctx);
- if (what == WANT_HMAC)
- crypto_hmac_begin (ctx, mi, key, len, k_opad);
- // create a userdataum with specific metatable
- digest_user_datum_t *dudat = (digest_user_datum_t *)lua_newuserdata(L, sizeof(digest_user_datum_t));
- luaL_getmetatable(L, "crypto.hash");
- lua_setmetatable(L, -2);
- // Set pointers to the mechanics and CTX
- dudat->mech_info = mi;
- dudat->ctx = ctx;
- dudat->k_opad = k_opad;
- return 1; // Pass userdata object back
- }
- /* crypto.new_hash("MECHTYPE") */
- static int crypto_new_hash (lua_State *L)
- {
- return crypto_new_hash_hmac (L, WANT_HASH);
- }
- /* crypto.new_hmac("MECHTYPE", "KEY") */
- static int crypto_new_hmac (lua_State *L)
- {
- return crypto_new_hash_hmac (L, WANT_HMAC);
- }
- /* Called as object, params:
- 1 - userdata "this"
- 2 - new string to add to the hash state */
- static int crypto_hash_update (lua_State *L)
- {
- NODE_DBG("enter crypto_hash_update.\n");
- digest_user_datum_t *dudat;
- size_t sl;
- dudat = (digest_user_datum_t *)luaL_checkudata(L, 1, "crypto.hash");
- const digest_mech_info_t *mi = dudat->mech_info;
- size_t len = 0;
- const char *data = luaL_checklstring (L, 2, &len);
- mi->update (dudat->ctx, data, len);
- return 0; // No return value
- }
- /* Called as object, no params. Returns digest of default size. */
- static int crypto_hash_finalize (lua_State *L)
- {
- NODE_DBG("enter crypto_hash_update.\n");
- digest_user_datum_t *dudat;
- size_t sl;
- dudat = (digest_user_datum_t *)luaL_checkudata(L, 1, "crypto.hash");
- const digest_mech_info_t *mi = dudat->mech_info;
- uint8_t digest[mi->digest_size]; // Allocate as local
- if (dudat->k_opad)
- crypto_hmac_finalize (dudat->ctx, mi, dudat->k_opad, digest);
- else
- mi->finalize (digest, dudat->ctx);
- lua_pushlstring (L, digest, sizeof (digest));
- return 1;
- }
- /* Frees memory for the user datum and CTX hash state */
- static int crypto_hash_gcdelete (lua_State *L)
- {
- NODE_DBG("enter crypto_hash_delete.\n");
- digest_user_datum_t *dudat;
- dudat = (digest_user_datum_t *)luaL_checkudata(L, 1, "crypto.hash");
- // luaM_free() uses type info to obtain original size, so have to delve
- // one level deeper and explicitly pass the size due to void*
- luaM_realloc_ (L, dudat->ctx, dudat->mech_info->ctx_size, 0);
- luaM_free (L, dudat->k_opad);
- return 0;
- }
- static sint32_t vfs_read_wrap (int fd, void *ptr, size_t len)
- {
- return vfs_read (fd, ptr, len);
- }
- /* rawdigest = crypto.hash("MD5", filename)
- * strdigest = crypto.toHex(rawdigest)
- */
- static int crypto_flhash (lua_State *L)
- {
- const digest_mech_info_t *mi = crypto_digest_mech (luaL_checkstring (L, 1));
- if (!mi)
- return bad_mech (L);
- const char *filename = luaL_checkstring (L, 2);
- // Open the file
- int file_fd = vfs_open (filename, "r");
- if(!file_fd) {
- return bad_file(L);
- }
- // Compute hash
- uint8_t digest[mi->digest_size];
- int returncode = crypto_fhash (mi, &vfs_read_wrap, file_fd, digest);
- // Finish up
- vfs_close(file_fd);
- if (returncode == ENOMEM)
- return bad_mem (L);
- else if (returncode == EINVAL)
- return bad_mech(L);
- else
- lua_pushlstring (L, digest, sizeof (digest));
- return 1;
- }
- /* rawsignature = crypto.hmac("SHA1", str, key)
- * strsignature = crypto.toHex(rawsignature)
- */
- static int crypto_lhmac (lua_State *L)
- {
- const digest_mech_info_t *mi = crypto_digest_mech (luaL_checkstring (L, 1));
- if (!mi)
- return bad_mech (L);
- size_t len = 0;
- const char *data = luaL_checklstring (L, 2, &len);
- size_t klen = 0;
- const char *key = luaL_checklstring (L, 3, &klen);
- uint8_t digest[mi->digest_size];
- if (crypto_hmac (mi, data, len, key, klen, digest) != 0)
- return bad_mem (L);
- lua_pushlstring (L, digest, sizeof (digest));
- return 1;
- }
- static const crypto_mech_t *get_mech (lua_State *L, int idx)
- {
- const char *name = luaL_checkstring (L, idx);
- const crypto_mech_t *mech = crypto_encryption_mech (name);
- if (mech)
- return mech;
- luaL_error (L, "unknown cipher: %s", name);
- __builtin_unreachable ();
- }
- static int crypto_encdec (lua_State *L, bool enc)
- {
- const crypto_mech_t *mech = get_mech (L, 1);
- size_t klen;
- const char *key = luaL_checklstring (L, 2, &klen);
- size_t dlen;
- const char *data = luaL_checklstring (L, 3, &dlen);
- size_t ivlen;
- const char *iv = luaL_optlstring (L, 4, "", &ivlen);
- size_t bs = mech->block_size;
- size_t outlen = ((dlen + bs -1) / bs) * bs;
- char *buf = (char *)os_zalloc (outlen);
- if (!buf)
- return luaL_error (L, "crypto init failed");
- crypto_op_t op =
- {
- key, klen,
- iv, ivlen,
- data, dlen,
- buf, outlen,
- enc ? OP_ENCRYPT : OP_DECRYPT
- };
- if (!mech->run (&op))
- {
- os_free (buf);
- return luaL_error (L, "crypto op failed");
- }
- else
- {
- lua_pushlstring (L, buf, outlen);
- // note: if lua_pushlstring runs out of memory, we leak buf :(
- os_free (buf);
- return 1;
- }
- }
- static int lcrypto_encrypt (lua_State *L)
- {
- return crypto_encdec (L, true);
- }
- static int lcrypto_decrypt (lua_State *L)
- {
- return crypto_encdec (L, false);
- }
- // Hash function map
- static const LUA_REG_TYPE crypto_hash_map[] = {
- { LSTRKEY( "update" ), LFUNCVAL( crypto_hash_update ) },
- { LSTRKEY( "finalize" ), LFUNCVAL( crypto_hash_finalize ) },
- { LSTRKEY( "__gc" ), LFUNCVAL( crypto_hash_gcdelete ) },
- { LSTRKEY( "__index" ), LROVAL( crypto_hash_map ) },
- { LNILKEY, LNILVAL }
- };
- // Module function map
- static const LUA_REG_TYPE crypto_map[] = {
- { LSTRKEY( "sha1" ), LFUNCVAL( crypto_sha1 ) },
- { LSTRKEY( "toBase64" ), LFUNCVAL( crypto_base64_encode ) },
- { LSTRKEY( "toHex" ), LFUNCVAL( crypto_hex_encode ) },
- { LSTRKEY( "mask" ), LFUNCVAL( crypto_mask ) },
- { LSTRKEY( "hash" ), LFUNCVAL( crypto_lhash ) },
- { LSTRKEY( "fhash" ), LFUNCVAL( crypto_flhash ) },
- { LSTRKEY( "new_hash" ), LFUNCVAL( crypto_new_hash ) },
- { LSTRKEY( "hmac" ), LFUNCVAL( crypto_lhmac ) },
- { LSTRKEY( "new_hmac" ), LFUNCVAL( crypto_new_hmac ) },
- { LSTRKEY( "encrypt" ), LFUNCVAL( lcrypto_encrypt ) },
- { LSTRKEY( "decrypt" ), LFUNCVAL( lcrypto_decrypt ) },
- { LNILKEY, LNILVAL }
- };
- int luaopen_crypto ( lua_State *L )
- {
- luaL_rometatable(L, "crypto.hash", (void *)crypto_hash_map); // create metatable for crypto.hash
- return 0;
- }
- NODEMCU_MODULE(CRYPTO, "crypto", crypto_map, luaopen_crypto);
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