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#include "../crypto.h"
#include <stdio.h>
#include <stdint.h>
struct bsdchecksum_hash bsdchecksum_init(){
return (struct bsdchecksum_hash){.check = 0x0};
}
int bsdchecksum_free_l(lua_State* L){
return 0;
}
void bsdchecksum_update(uint8_t* aa, size_t len, struct bsdchecksum_hash* hash){
for(int i = 0; i != len; i++){
uint8_t a = aa[i];
hash->check = (hash->check >> 1) + ((hash->check & 1) << 15);
hash->check += a;
hash->check &= 0xffff;
}
}
uint16_t bsdchecksum_final(struct bsdchecksum_hash* hash){
return hash->check;
}
uint16_t bsdchecksum(uint8_t* a, size_t len){
struct bsdchecksum_hash b = bsdchecksum_init();
bsdchecksum_update(a, len, &b);
return bsdchecksum_final(&b);
}
common_hash_clone(bsdchecksum);
common_hash_init_update(bsdchecksum);
int l_bsdchecksum_final(lua_State* L){
struct bsdchecksum_hash* a = (struct bsdchecksum_hash*)lua_touserdata(L, 1);
uint32_t u = bsdchecksum_final(a);
char digest[32];
sprintf(digest,"%i",u);
lua_pushstring(L, digest);
return 1;
}
int l_bsdchecksum(lua_State* L){
if(lua_gettop(L) == 0) return l_bsdchecksum_init(L);
size_t len = 0;
uint8_t* a = (uint8_t*)luaL_checklstring(L, 1, &len);
char digest[16];
//uint16_t u = i_bsdchecksum(a, len);
uint16_t u = bsdchecksum(a, len);
sprintf(digest,"%i",u);
lua_pushstring(L, digest);
return 1;
}
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