Add crypto module initially containing sha1 and base64_encode.

This commit is contained in:
= 2015-05-25 23:06:49 -05:00
parent 4736f10d23
commit ca78b9ea2c
3 changed files with 101 additions and 1 deletions

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@ -31,6 +31,7 @@
#define LUA_USE_MODULES_U8G
#define LUA_USE_MODULES_WS2812
#define LUA_USE_MODULES_CJSON
#define LUA_USE_MODULES_CRYPTO
#endif /* LUA_USE_MODULES */
#endif /* __USER_MODULES_H__ */

90
app/modules/crypto.c Normal file
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@ -0,0 +1,90 @@
// Module for cryptography
//#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
#include "platform.h"
#include "auxmods.h"
#include "lrotable.h"
#include "c_types.h"
#include "c_stdlib.h"
#include "user_interface.h"
/**
* 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 )
{
// We only need a data buffer large enough to match SHA1_CTX in the rom.
// I *think* this is a 92-byte netbsd struct.
uint8_t ctx[100];
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;
}
static const char* bytes64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
/**
* encoded = crypto.base64_encode(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;
}
// Module function map
#define MIN_OPT_LEVEL 2
#include "lrodefs.h"
const LUA_REG_TYPE crypto_map[] =
{
{ LSTRKEY( "sha1" ), LFUNCVAL( crypto_sha1 ) },
{ LSTRKEY( "base64Encode" ), LFUNCVAL( crypto_base64_encode ) },
#if LUA_OPTIMIZE_MEMORY > 0
#endif
{ LNILKEY, LNILVAL }
};
LUALIB_API int luaopen_crypto( lua_State *L )
{
#if LUA_OPTIMIZE_MEMORY > 0
return 0;
#else // #if LUA_OPTIMIZE_MEMORY > 0
luaL_register( L, AUXLIB_CRYPTO, crypto_map );
// Add constants
return 1;
#endif // #if LUA_OPTIMIZE_MEMORY > 0
}

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@ -149,6 +149,14 @@
#define ROM_MODULES_CJSON
#endif
#if defined(LUA_USE_MODULES_CRYPTO)
#define MODULES_CRYPTO "crypto"
#define ROM_MODULES_CRYPTO \
_ROM(MODULES_CRYPTO, luaopen_crypto, crypto_map)
#else
#define ROM_MODULES_CRYPTO
#endif
#define LUA_MODULES_ROM \
ROM_MODULES_GPIO \
ROM_MODULES_PWM \
@ -167,7 +175,8 @@
ROM_MODULES_OW \
ROM_MODULES_BIT \
ROM_MODULES_WS2812 \
ROM_MODULES_CJSON
ROM_MODULES_CJSON \
ROM_MODULES_CRYPTO
#endif