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#include "../crypto.h"
#include <stdio.h>
#include <stdint.h>
#include <stdio.h>
#include <stdint.h>
uint32_t i_crc32(uint8_t *data, size_t len){
uint32_t crc = 0xFFFFFFFF;
for(int i = 0; i < len; i++){
uint32_t extract = data[i];
for(int z = 0; z < 8; z++){
uint32_t b = (extract^crc)&1;
crc>>=1;
if(b) crc^=0xEDB88320;
extract>>=1;
}
}
return -(crc+1);
}
uint16_t i_crc16(uint8_t *aa, size_t len){
uint16_t crc = 0x0;
for(int i = 0; i != len; i++){
uint8_t a = aa[i];
crc ^= a;
for (int z = 0; z < 8; z++){
if (crc & 1) crc = (crc >> 1) ^ 0xA001;
else crc = (crc >> 1);
}
}
return crc;
}
uint8_t i_crc8(uint8_t *aa, size_t len){
//crc8 maxim
uint8_t crc = 0x00;
for(int i = 0; i != len; i++){
uint8_t a = aa[i];
for (int z = 0; z < 8; z++){
uint8_t b = (crc ^ a) & 1;
crc >>= 1;
if(b) crc ^= 0x8c;
a >>=1;
}
}
return crc;
}
int l_crc8(lua_State* L){
size_t len = 0;
uint8_t* a = (uint8_t*)luaL_checklstring(L, 1, &len);
char digest[8];
uint8_t u = i_crc8(a, len);
sprintf(digest,"%x",u);
lua_pushstring(L, digest);
return 1;
}
int l_crc16(lua_State* L){
size_t len = 0;
uint8_t* a = (uint8_t*)luaL_checklstring(L, 1, &len);
char digest[16];
uint16_t u = i_crc16(a, len);
sprintf(digest,"%x",u);
lua_pushstring(L, digest);
return 1;
}
int l_crc32(lua_State* L){
size_t len = 0;
uint8_t* a = (uint8_t*)luaL_checklstring(L, 1, &len);
char digest[32];
uint32_t u = i_crc32(a, len);
sprintf(digest,"%x",u);
lua_pushstring(L, digest);
return 1;
}
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