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#include "../crypto.h"
#include <stdio.h>
#include <stdint.h>
struct sdbm_hash sdbm_init(){
return (struct sdbm_hash){.hash = 0};
}
void sdbm_update(uint8_t* in, size_t len, struct sdbm_hash* hash){
for(int i = 0; i != len; i++){
hash->hash = (uint64_t)*in + (hash->hash << 6) + (hash->hash << 16) - hash->hash;
in++;
}
}
uint64_t sdbm_final(struct sdbm_hash* hash){
return hash->hash;
}
uint64_t sdbm(uint8_t* in, size_t len){
struct sdbm_hash a = sdbm_init();
sdbm_update(in, len, &a);
return sdbm_final(&a);
}
common_hash_init_update(sdbm);
int l_sdbm_final(lua_State* L){
lua_pushstring(L, "ud");
lua_gettable(L, 1);
struct sdbm_hash* a = (struct sdbm_hash*)lua_touserdata(L, -1);
uint64_t u = sdbm_final(a);
char digest[64];
sprintf(digest,"%016lx",u);
lua_pushstring(L, digest);
return 1;
}
int l_sdbm(lua_State* L){
if(lua_gettop(L) == 0) return l_sdbm_init(L);
size_t len = 0;
uint8_t* a = (uint8_t*)luaL_checklstring(L, 1, &len);
char digest[64];
uint64_t u = sdbm(a, len);
sprintf(digest,"%016lx",u);
lua_pushstring(L, digest);
return 1;
}
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