136 lines
3.3 KiB
C
136 lines
3.3 KiB
C
// Module for cryptography
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//#include "lua.h"
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#include "lualib.h"
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#include "lauxlib.h"
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#include "platform.h"
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#include "auxmods.h"
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#include "lrotable.h"
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#include "c_types.h"
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#include "c_stdlib.h"
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#include "user_interface.h"
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/**
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* hash = crypto.sha1(input)
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*
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* Calculates raw SHA1 hash of input string.
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* Input is arbitrary string, output is raw 20-byte hash as string.
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*/
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static int crypto_sha1( lua_State* L )
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{
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// We only need a data buffer large enough to match SHA1_CTX in the rom.
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// I *think* this is a 92-byte netbsd struct.
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uint8_t ctx[100];
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uint8_t digest[20];
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// Read the string from lua (with length)
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int len;
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const char* msg = luaL_checklstring(L, 1, &len);
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// Use the SHA* functions in the rom
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SHA1Init(ctx);
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SHA1Update(ctx, msg, len);
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SHA1Final(digest, ctx);
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// Push the result as a lua string
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lua_pushlstring(L, digest, 20);
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return 1;
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}
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static const char* bytes64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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/**
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* encoded = crypto.base64Encode(raw)
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*
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* Encodes raw binary string as base64 string.
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*/
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static int crypto_base64_encode( lua_State* L )
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{
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// TODO: figure out signature of base64_encode in rom and use that instead.
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int len;
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const char* msg = luaL_checklstring(L, 1, &len);
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int blen = (len + 2) / 3 * 4;
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char* out = (char*)c_malloc(blen);
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int j = 0, i;
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for (i = 0; i < len; i += 3) {
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int a = msg[i];
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int b = (i + 1 < len) ? msg[i + 1] : 0;
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int c = (i + 2 < len) ? msg[i + 2] : 0;
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out[j++] = bytes64[a >> 2];
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out[j++] = bytes64[((a & 3) << 4) | (b >> 4)];
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out[j++] = (i + 1 < len) ? bytes64[((b & 15) << 2) | (c >> 6)] : 61;
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out[j++] = (i + 2 < len) ? bytes64[(c & 63)] : 61;
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}
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lua_pushlstring(L, out, j);
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c_free(out);
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return 1;
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}
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static const char* byteshex = "0123456789abcdef";
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/**
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* encoded = crypto.hexEncode(raw)
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*
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* Encodes raw binary string as hex string.
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*/
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static int crypto_hex_encode( lua_State* L)
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{
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int len;
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const char* msg = luaL_checklstring(L, 1, &len);
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char* out = (char*)c_malloc(len * 2);
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int i, j = 0;
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for (i = 0; i < len; i++) {
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out[j++] = byteshex[msg[i] >> 4];
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out[j++] = byteshex[msg[i] & 0xf];
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}
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lua_pushlstring(L, out, len*2);
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c_free(out);
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return 1;
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}
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/**
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* masked = crypto.mask(message, mask)
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*
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* Apply a mask (repeated if shorter than message) as XOR to each byte.
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*/
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static int crypto_mask( lua_State* L )
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{
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int len, mask_len;
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const char* msg = luaL_checklstring(L, 1, &len);
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const char* mask = luaL_checklstring(L, 2, &mask_len);
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int i;
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char* copy = (char*)c_malloc(len);
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for (i = 0; i < len; i++) {
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copy[i] = msg[i] ^ mask[i % 4];
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}
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lua_pushlstring(L, copy, len);
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c_free(copy);
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return 1;
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}
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// Module function map
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#define MIN_OPT_LEVEL 2
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#include "lrodefs.h"
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const LUA_REG_TYPE crypto_map[] =
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{
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{ LSTRKEY( "sha1" ), LFUNCVAL( crypto_sha1 ) },
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{ LSTRKEY( "base64Encode" ), LFUNCVAL( crypto_base64_encode ) },
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{ LSTRKEY( "hexEncode" ), LFUNCVAL( crypto_hex_encode ) },
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{ LSTRKEY( "mask" ), LFUNCVAL( crypto_mask ) },
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#if LUA_OPTIMIZE_MEMORY > 0
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#endif
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{ LNILKEY, LNILVAL }
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};
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LUALIB_API int luaopen_crypto( lua_State *L )
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{
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#if LUA_OPTIMIZE_MEMORY > 0
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return 0;
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#else // #if LUA_OPTIMIZE_MEMORY > 0
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luaL_register( L, AUXLIB_CRYPTO, crypto_map );
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// Add constants
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return 1;
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#endif // #if LUA_OPTIMIZE_MEMORY > 0
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}
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